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book3s_hv.c
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linux-6.19.14/arch/powerpc/kvm/book3s_hv.c
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> 4 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved. 5 * 6 * Authors: 7 * Paul Mackerras <paulus@au1.ibm.com> 8 * Alexander Graf <agraf@suse.de> 9 * Kevin Wolf <mail@kevin-wolf.de> 10 * 11 * Description: KVM functions specific to running on Book 3S 12 * processors in hypervisor mode (specifically POWER7 and later). 13 * 14 * This file is derived from arch/powerpc/kvm/book3s.c, 15 * by Alexander Graf <agraf@suse.de>. 16 */ 17 18#include <linux/kvm_host.h> 19#include <linux/kernel.h> 20#include <linux/err.h> 21#include <linux/slab.h> 22#include <linux/preempt.h> 23#include <linux/sched/signal.h> 24#include <linux/sched/stat.h> 25#include <linux/delay.h> 26#include <linux/export.h> 27#include <linux/fs.h> 28#include <linux/anon_inodes.h> 29#include <linux/cpu.h> 30#include <linux/cpumask.h> 31#include <linux/spinlock.h> 32#include <linux/page-flags.h> 33#include <linux/srcu.h> 34#include <linux/miscdevice.h> 35#include <linux/debugfs.h> 36#include <linux/gfp.h> 37#include <linux/vmalloc.h> 38#include <linux/highmem.h> 39#include <linux/hugetlb.h> 40#include <linux/kvm_irqfd.h> 41#include <linux/irqbypass.h> 42#include <linux/module.h> 43#include <linux/compiler.h> 44#include <linux/of.h> 45#include <linux/irqdomain.h> 46#include <linux/smp.h> 47 48#include <asm/ftrace.h> 49#include <asm/reg.h> 50#include <asm/ppc-opcode.h> 51#include <asm/asm-prototypes.h> 52#include <asm/archrandom.h> 53#include <asm/debug.h> 54#include <asm/disassemble.h> 55#include <asm/cputable.h> 56#include <asm/cacheflush.h> 57#include <linux/uaccess.h> 58#include <asm/interrupt.h> 59#include <asm/io.h> 60#include <asm/kvm_ppc.h> 61#include <asm/kvm_book3s.h> 62#include <asm/mmu_context.h> 63#include <asm/lppaca.h> 64#include <asm/pmc.h> 65#include <asm/processor.h> 66#include <asm/cputhreads.h> 67#include <asm/page.h> 68#include <asm/hvcall.h> 69#include <asm/switch_to.h> 70#include <asm/smp.h> 71#include <asm/dbell.h> 72#include <asm/hmi.h> 73#include <asm/pnv-pci.h> 74#include <asm/mmu.h> 75#include <asm/opal.h> 76#include <asm/xics.h> 77#include <asm/xive.h> 78#include <asm/hw_breakpoint.h> 79#include <asm/kvm_book3s_uvmem.h> 80#include <asm/ultravisor.h> 81#include <asm/dtl.h> 82#include <asm/plpar_wrappers.h> 83 84#include <trace/events/ipi.h> 85 86#include "book3s.h" 87#include "book3s_hv.h" 88 89#define CREATE_TRACE_POINTS 90#include "trace_hv.h" 91 92/* #define EXIT_DEBUG */ 93/* #define EXIT_DEBUG_SIMPLE */ 94/* #define EXIT_DEBUG_INT */ 95 96/* Used to indicate that a guest page fault needs to be handled */ 97#define RESUME_PAGE_FAULT (RESUME_GUEST | RESUME_FLAG_ARCH1) 98/* Used to indicate that a guest passthrough interrupt needs to be handled */ 99#define RESUME_PASSTHROUGH (RESUME_GUEST | RESUME_FLAG_ARCH2) 100 101/* Used as a "null" value for timebase values */ 102#define TB_NIL (~(u64)0) 103 104static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1); 105 106static int dynamic_mt_modes = 6; 107module_param(dynamic_mt_modes, int, 0644); 108MODULE_PARM_DESC(dynamic_mt_modes, "Set of allowed dynamic micro-threading modes: 0 (= none), 2, 4, or 6 (= 2 or 4)"); 109static int target_smt_mode; 110module_param(target_smt_mode, int, 0644); 111MODULE_PARM_DESC(target_smt_mode, "Target threads per core (0 = max)"); 112 113static bool one_vm_per_core; 114module_param(one_vm_per_core, bool, S_IRUGO | S_IWUSR); 115MODULE_PARM_DESC(one_vm_per_core, "Only run vCPUs from the same VM on a core (requires POWER8 or older)"); 116 117#ifdef CONFIG_KVM_XICS 118static const struct kernel_param_ops module_param_ops = { 119 .set = param_set_int, 120 .get = param_get_int, 121}; 122 123module_param_cb(kvm_irq_bypass, &module_param_ops, &kvm_irq_bypass, 0644); 124MODULE_PARM_DESC(kvm_irq_bypass, "Bypass passthrough interrupt optimization"); 125 126module_param_cb(h_ipi_redirect, &module_param_ops, &h_ipi_redirect, 0644); 127MODULE_PARM_DESC(h_ipi_redirect, "Redirect H_IPI wakeup to a free host core"); 128#endif 129 130/* If set, guests are allowed to create and control nested guests */ 131static bool nested = true; 132module_param(nested, bool, S_IRUGO | S_IWUSR); 133MODULE_PARM_DESC(nested, "Enable nested virtualization (only on POWER9)"); 134 135static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu); 136 137/* 138 * RWMR values for POWER8. These control the rate at which PURR 139 * and SPURR count and should be set according to the number of 140 * online threads in the vcore being run. 141 */ 142#define RWMR_RPA_P8_1THREAD 0x164520C62609AECAUL 143#define RWMR_RPA_P8_2THREAD 0x7FFF2908450D8DA9UL 144#define RWMR_RPA_P8_3THREAD 0x164520C62609AECAUL 145#define RWMR_RPA_P8_4THREAD 0x199A421245058DA9UL 146#define RWMR_RPA_P8_5THREAD 0x164520C62609AECAUL 147#define RWMR_RPA_P8_6THREAD 0x164520C62609AECAUL 148#define RWMR_RPA_P8_7THREAD 0x164520C62609AECAUL 149#define RWMR_RPA_P8_8THREAD 0x164520C62609AECAUL 150 151static unsigned long p8_rwmr_values[MAX_SMT_THREADS + 1] = { 152 RWMR_RPA_P8_1THREAD, 153 RWMR_RPA_P8_1THREAD, 154 RWMR_RPA_P8_2THREAD, 155 RWMR_RPA_P8_3THREAD, 156 RWMR_RPA_P8_4THREAD, 157 RWMR_RPA_P8_5THREAD, 158 RWMR_RPA_P8_6THREAD, 159 RWMR_RPA_P8_7THREAD, 160 RWMR_RPA_P8_8THREAD, 161}; 162 163static inline struct kvm_vcpu *next_runnable_thread(struct kvmppc_vcore *vc, 164 int *ip) 165{ 166 int i = *ip; 167 struct kvm_vcpu *vcpu; 168 169 while (++i < MAX_SMT_THREADS) { 170 vcpu = READ_ONCE(vc->runnable_threads[i]); 171 if (vcpu) { 172 *ip = i; 173 return vcpu; 174 } 175 } 176 return NULL; 177} 178 179/* Used to traverse the list of runnable threads for a given vcore */ 180#define for_each_runnable_thread(i, vcpu, vc) \ 181 for (i = -1; (vcpu = next_runnable_thread(vc, &i)); ) 182 183static bool kvmppc_ipi_thread(int cpu) 184{ 185 unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); 186 187 /* If we're a nested hypervisor, fall back to ordinary IPIs for now */ 188 if (kvmhv_on_pseries()) 189 return false; 190 191 /* On POWER9 we can use msgsnd to IPI any cpu */ 192 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 193 msg |= get_hard_smp_processor_id(cpu); 194 smp_mb(); 195 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 196 return true; 197 } 198 199 /* On POWER8 for IPIs to threads in the same core, use msgsnd */ 200 if (cpu_has_feature(CPU_FTR_ARCH_207S)) { 201 preempt_disable(); 202 if (cpu_first_thread_sibling(cpu) == 203 cpu_first_thread_sibling(smp_processor_id())) { 204 msg |= cpu_thread_in_core(cpu); 205 smp_mb(); 206 __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); 207 preempt_enable(); 208 return true; 209 } 210 preempt_enable(); 211 } 212 213#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP) 214 if (cpu >= 0 && cpu < nr_cpu_ids) { 215 if (paca_ptrs[cpu]->kvm_hstate.xics_phys) { 216 xics_wake_cpu(cpu); 217 return true; 218 } 219 opal_int_set_mfrr(get_hard_smp_processor_id(cpu), IPI_PRIORITY); 220 return true; 221 } 222#endif 223 224 return false; 225} 226 227static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu) 228{ 229 int cpu; 230 struct rcuwait *waitp; 231 232 /* 233 * rcuwait_wake_up contains smp_mb() which orders prior stores that 234 * create pending work vs below loads of cpu fields. The other side 235 * is the barrier in vcpu run that orders setting the cpu fields vs 236 * testing for pending work. 237 */ 238 239 waitp = kvm_arch_vcpu_get_wait(vcpu); 240 if (rcuwait_wake_up(waitp)) 241 ++vcpu->stat.generic.halt_wakeup; 242 243 cpu = READ_ONCE(vcpu->arch.thread_cpu); 244 if (cpu >= 0 && kvmppc_ipi_thread(cpu)) 245 return; 246 247 /* CPU points to the first thread of the core */ 248 cpu = vcpu->cpu; 249 if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu)) 250 smp_send_reschedule(cpu); 251} 252 253/* 254 * We use the vcpu_load/put functions to measure stolen time. 255 * 256 * Stolen time is counted as time when either the vcpu is able to 257 * run as part of a virtual core, but the task running the vcore 258 * is preempted or sleeping, or when the vcpu needs something done 259 * in the kernel by the task running the vcpu, but that task is 260 * preempted or sleeping. Those two things have to be counted 261 * separately, since one of the vcpu tasks will take on the job 262 * of running the core, and the other vcpu tasks in the vcore will 263 * sleep waiting for it to do that, but that sleep shouldn't count 264 * as stolen time. 265 * 266 * Hence we accumulate stolen time when the vcpu can run as part of 267 * a vcore using vc->stolen_tb, and the stolen time when the vcpu 268 * needs its task to do other things in the kernel (for example, 269 * service a page fault) in busy_stolen. We don't accumulate 270 * stolen time for a vcore when it is inactive, or for a vcpu 271 * when it is in state RUNNING or NOTREADY. NOTREADY is a bit of 272 * a misnomer; it means that the vcpu task is not executing in 273 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in 274 * the kernel. We don't have any way of dividing up that time 275 * between time that the vcpu is genuinely stopped, time that 276 * the task is actively working on behalf of the vcpu, and time 277 * that the task is preempted, so we don't count any of it as 278 * stolen. 279 * 280 * Updates to busy_stolen are protected by arch.tbacct_lock; 281 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock 282 * lock. The stolen times are measured in units of timebase ticks. 283 * (Note that the != TB_NIL checks below are purely defensive; 284 * they should never fail.) 285 * 286 * The POWER9 path is simpler, one vcpu per virtual core so the 287 * former case does not exist. If a vcpu is preempted when it is 288 * BUSY_IN_HOST and not ceded or otherwise blocked, then accumulate 289 * the stolen cycles in busy_stolen. RUNNING is not a preemptible 290 * state in the P9 path. 291 */ 292 293static void kvmppc_core_start_stolen(struct kvmppc_vcore *vc, u64 tb) 294{ 295 unsigned long flags; 296 297 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 298 299 spin_lock_irqsave(&vc->stoltb_lock, flags); 300 vc->preempt_tb = tb; 301 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 302} 303 304static void kvmppc_core_end_stolen(struct kvmppc_vcore *vc, u64 tb) 305{ 306 unsigned long flags; 307 308 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 309 310 spin_lock_irqsave(&vc->stoltb_lock, flags); 311 if (vc->preempt_tb != TB_NIL) { 312 vc->stolen_tb += tb - vc->preempt_tb; 313 vc->preempt_tb = TB_NIL; 314 } 315 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 316} 317 318static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu) 319{ 320 struct kvmppc_vcore *vc = vcpu->arch.vcore; 321 unsigned long flags; 322 u64 now; 323 324 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 325 if (vcpu->arch.busy_preempt != TB_NIL) { 326 WARN_ON_ONCE(vcpu->arch.state != KVMPPC_VCPU_BUSY_IN_HOST); 327 vc->stolen_tb += mftb() - vcpu->arch.busy_preempt; 328 vcpu->arch.busy_preempt = TB_NIL; 329 } 330 return; 331 } 332 333 now = mftb(); 334 335 /* 336 * We can test vc->runner without taking the vcore lock, 337 * because only this task ever sets vc->runner to this 338 * vcpu, and once it is set to this vcpu, only this task 339 * ever sets it to NULL. 340 */ 341 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 342 kvmppc_core_end_stolen(vc, now); 343 344 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 345 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST && 346 vcpu->arch.busy_preempt != TB_NIL) { 347 vcpu->arch.busy_stolen += now - vcpu->arch.busy_preempt; 348 vcpu->arch.busy_preempt = TB_NIL; 349 } 350 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 351} 352 353static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu) 354{ 355 struct kvmppc_vcore *vc = vcpu->arch.vcore; 356 unsigned long flags; 357 u64 now; 358 359 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 360 /* 361 * In the P9 path, RUNNABLE is not preemptible 362 * (nor takes host interrupts) 363 */ 364 WARN_ON_ONCE(vcpu->arch.state == KVMPPC_VCPU_RUNNABLE); 365 /* 366 * Account stolen time when preempted while the vcpu task is 367 * running in the kernel (but not in qemu, which is INACTIVE). 368 */ 369 if (task_is_running(current) && 370 vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) 371 vcpu->arch.busy_preempt = mftb(); 372 return; 373 } 374 375 now = mftb(); 376 377 if (vc->runner == vcpu && vc->vcore_state >= VCORE_SLEEPING) 378 kvmppc_core_start_stolen(vc, now); 379 380 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 381 if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST) 382 vcpu->arch.busy_preempt = now; 383 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 384} 385 386static void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr) 387{ 388 vcpu->arch.pvr = pvr; 389} 390 391/* Dummy value used in computing PCR value below */ 392#define PCR_ARCH_31 (PCR_ARCH_300 << 1) 393 394static inline unsigned long map_pcr_to_cap(unsigned long pcr) 395{ 396 unsigned long cap = 0; 397 398 switch (pcr) { 399 case PCR_ARCH_300: 400 cap = H_GUEST_CAP_POWER9; 401 break; 402 case PCR_ARCH_31: 403 if (cpu_has_feature(CPU_FTR_P11_PVR)) 404 cap = H_GUEST_CAP_POWER11; 405 else 406 cap = H_GUEST_CAP_POWER10; 407 break; 408 default: 409 break; 410 } 411 412 return cap; 413} 414 415static int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat) 416{ 417 unsigned long host_pcr_bit = 0, guest_pcr_bit = 0, cap = 0; 418 struct kvmppc_vcore *vc = vcpu->arch.vcore; 419 420 /* We can (emulate) our own architecture version and anything older */ 421 if (cpu_has_feature(CPU_FTR_P11_PVR) || cpu_has_feature(CPU_FTR_ARCH_31)) 422 host_pcr_bit = PCR_ARCH_31; 423 else if (cpu_has_feature(CPU_FTR_ARCH_300)) 424 host_pcr_bit = PCR_ARCH_300; 425 else if (cpu_has_feature(CPU_FTR_ARCH_207S)) 426 host_pcr_bit = PCR_ARCH_207; 427 else if (cpu_has_feature(CPU_FTR_ARCH_206)) 428 host_pcr_bit = PCR_ARCH_206; 429 else 430 host_pcr_bit = PCR_ARCH_205; 431 432 /* Determine lowest PCR bit needed to run guest in given PVR level */ 433 guest_pcr_bit = host_pcr_bit; 434 if (arch_compat) { 435 switch (arch_compat) { 436 case PVR_ARCH_205: 437 guest_pcr_bit = PCR_ARCH_205; 438 break; 439 case PVR_ARCH_206: 440 case PVR_ARCH_206p: 441 guest_pcr_bit = PCR_ARCH_206; 442 break; 443 case PVR_ARCH_207: 444 guest_pcr_bit = PCR_ARCH_207; 445 break; 446 case PVR_ARCH_300: 447 guest_pcr_bit = PCR_ARCH_300; 448 break; 449 case PVR_ARCH_31: 450 case PVR_ARCH_31_P11: 451 guest_pcr_bit = PCR_ARCH_31; 452 break; 453 default: 454 return -EINVAL; 455 } 456 } 457 458 /* Check requested PCR bits don't exceed our capabilities */ 459 if (guest_pcr_bit > host_pcr_bit) 460 return -EINVAL; 461 462 if (kvmhv_on_pseries() && kvmhv_is_nestedv2()) { 463 /* 464 * 'arch_compat == 0' would mean the guest should default to 465 * L1's compatibility. In this case, the guest would pick 466 * host's PCR and evaluate the corresponding capabilities. 467 */ 468 cap = map_pcr_to_cap(guest_pcr_bit); 469 if (!(cap & nested_capabilities)) 470 return -EINVAL; 471 } 472 473 spin_lock(&vc->lock); 474 vc->arch_compat = arch_compat; 475 kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_LOGICAL_PVR); 476 /* 477 * Set all PCR bits for which guest_pcr_bit <= bit < host_pcr_bit 478 * Also set all reserved PCR bits 479 */ 480 vc->pcr = (host_pcr_bit - guest_pcr_bit) | PCR_MASK; 481 spin_unlock(&vc->lock); 482 483 return 0; 484} 485 486static void kvmppc_dump_regs(struct kvm_vcpu *vcpu) 487{ 488 int r; 489 490 pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id); 491 pr_err("pc = %.16lx msr = %.16llx trap = %x\n", 492 vcpu->arch.regs.nip, vcpu->arch.shregs.msr, vcpu->arch.trap); 493 for (r = 0; r < 16; ++r) 494 pr_err("r%2d = %.16lx r%d = %.16lx\n", 495 r, kvmppc_get_gpr(vcpu, r), 496 r+16, kvmppc_get_gpr(vcpu, r+16)); 497 pr_err("ctr = %.16lx lr = %.16lx\n", 498 vcpu->arch.regs.ctr, vcpu->arch.regs.link); 499 pr_err("srr0 = %.16llx srr1 = %.16llx\n", 500 vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1); 501 pr_err("sprg0 = %.16llx sprg1 = %.16llx\n", 502 vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1); 503 pr_err("sprg2 = %.16llx sprg3 = %.16llx\n", 504 vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3); 505 pr_err("cr = %.8lx xer = %.16lx dsisr = %.8x\n", 506 vcpu->arch.regs.ccr, vcpu->arch.regs.xer, vcpu->arch.shregs.dsisr); 507 pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar); 508 pr_err("fault dar = %.16lx dsisr = %.8x\n", 509 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 510 pr_err("SLB (%d entries):\n", vcpu->arch.slb_max); 511 for (r = 0; r < vcpu->arch.slb_max; ++r) 512 pr_err(" ESID = %.16llx VSID = %.16llx\n", 513 vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv); 514 pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.16lx\n", 515 vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1, 516 vcpu->arch.last_inst); 517} 518 519static struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id) 520{ 521 return kvm_get_vcpu_by_id(kvm, id); 522} 523 524static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa) 525{ 526 vpa->__old_status |= LPPACA_OLD_SHARED_PROC; 527 vpa->yield_count = cpu_to_be32(1); 528} 529 530static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v, 531 unsigned long addr, unsigned long len) 532{ 533 /* check address is cacheline aligned */ 534 if (addr & (L1_CACHE_BYTES - 1)) 535 return -EINVAL; 536 spin_lock(&vcpu->arch.vpa_update_lock); 537 if (v->next_gpa != addr || v->len != len) { 538 v->next_gpa = addr; 539 v->len = addr ? len : 0; 540 v->update_pending = 1; 541 } 542 spin_unlock(&vcpu->arch.vpa_update_lock); 543 return 0; 544} 545 546/* Length for a per-processor buffer is passed in at offset 4 in the buffer */ 547struct reg_vpa { 548 u32 dummy; 549 union { 550 __be16 hword; 551 __be32 word; 552 } length; 553}; 554 555static int vpa_is_registered(struct kvmppc_vpa *vpap) 556{ 557 if (vpap->update_pending) 558 return vpap->next_gpa != 0; 559 return vpap->pinned_addr != NULL; 560} 561 562static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu, 563 unsigned long flags, 564 unsigned long vcpuid, unsigned long vpa) 565{ 566 struct kvm *kvm = vcpu->kvm; 567 unsigned long len, nb; 568 void *va; 569 struct kvm_vcpu *tvcpu; 570 int err; 571 int subfunc; 572 struct kvmppc_vpa *vpap; 573 574 tvcpu = kvmppc_find_vcpu(kvm, vcpuid); 575 if (!tvcpu) 576 return H_PARAMETER; 577 578 subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK; 579 if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL || 580 subfunc == H_VPA_REG_SLB) { 581 /* Registering new area - address must be cache-line aligned */ 582 if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa) 583 return H_PARAMETER; 584 585 /* convert logical addr to kernel addr and read length */ 586 va = kvmppc_pin_guest_page(kvm, vpa, &nb); 587 if (va == NULL) 588 return H_PARAMETER; 589 if (subfunc == H_VPA_REG_VPA) 590 len = be16_to_cpu(((struct reg_vpa *)va)->length.hword); 591 else 592 len = be32_to_cpu(((struct reg_vpa *)va)->length.word); 593 kvmppc_unpin_guest_page(kvm, va, vpa, false); 594 595 /* Check length */ 596 if (len > nb || len < sizeof(struct reg_vpa)) 597 return H_PARAMETER; 598 } else { 599 vpa = 0; 600 len = 0; 601 } 602 603 err = H_PARAMETER; 604 vpap = NULL; 605 spin_lock(&tvcpu->arch.vpa_update_lock); 606 607 switch (subfunc) { 608 case H_VPA_REG_VPA: /* register VPA */ 609 /* 610 * The size of our lppaca is 1kB because of the way we align 611 * it for the guest to avoid crossing a 4kB boundary. We only 612 * use 640 bytes of the structure though, so we should accept 613 * clients that set a size of 640. 614 */ 615 BUILD_BUG_ON(sizeof(struct lppaca) != 640); 616 if (len < sizeof(struct lppaca)) 617 break; 618 vpap = &tvcpu->arch.vpa; 619 err = 0; 620 break; 621 622 case H_VPA_REG_DTL: /* register DTL */ 623 if (len < sizeof(struct dtl_entry)) 624 break; 625 len -= len % sizeof(struct dtl_entry); 626 627 /* Check that they have previously registered a VPA */ 628 err = H_RESOURCE; 629 if (!vpa_is_registered(&tvcpu->arch.vpa)) 630 break; 631 632 vpap = &tvcpu->arch.dtl; 633 err = 0; 634 break; 635 636 case H_VPA_REG_SLB: /* register SLB shadow buffer */ 637 /* Check that they have previously registered a VPA */ 638 err = H_RESOURCE; 639 if (!vpa_is_registered(&tvcpu->arch.vpa)) 640 break; 641 642 vpap = &tvcpu->arch.slb_shadow; 643 err = 0; 644 break; 645 646 case H_VPA_DEREG_VPA: /* deregister VPA */ 647 /* Check they don't still have a DTL or SLB buf registered */ 648 err = H_RESOURCE; 649 if (vpa_is_registered(&tvcpu->arch.dtl) || 650 vpa_is_registered(&tvcpu->arch.slb_shadow)) 651 break; 652 653 vpap = &tvcpu->arch.vpa; 654 err = 0; 655 break; 656 657 case H_VPA_DEREG_DTL: /* deregister DTL */ 658 vpap = &tvcpu->arch.dtl; 659 err = 0; 660 break; 661 662 case H_VPA_DEREG_SLB: /* deregister SLB shadow buffer */ 663 vpap = &tvcpu->arch.slb_shadow; 664 err = 0; 665 break; 666 } 667 668 if (vpap) { 669 vpap->next_gpa = vpa; 670 vpap->len = len; 671 vpap->update_pending = 1; 672 } 673 674 spin_unlock(&tvcpu->arch.vpa_update_lock); 675 676 return err; 677} 678 679static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap, 680 struct kvmppc_vpa *old_vpap) 681{ 682 struct kvm *kvm = vcpu->kvm; 683 void *va; 684 unsigned long nb; 685 unsigned long gpa; 686 687 /* 688 * We need to pin the page pointed to by vpap->next_gpa, 689 * but we can't call kvmppc_pin_guest_page under the lock 690 * as it does get_user_pages() and down_read(). So we 691 * have to drop the lock, pin the page, then get the lock 692 * again and check that a new area didn't get registered 693 * in the meantime. 694 */ 695 for (;;) { 696 gpa = vpap->next_gpa; 697 spin_unlock(&vcpu->arch.vpa_update_lock); 698 va = NULL; 699 nb = 0; 700 if (gpa) 701 va = kvmppc_pin_guest_page(kvm, gpa, &nb); 702 spin_lock(&vcpu->arch.vpa_update_lock); 703 if (gpa == vpap->next_gpa) 704 break; 705 /* sigh... unpin that one and try again */ 706 if (va) 707 kvmppc_unpin_guest_page(kvm, va, gpa, false); 708 } 709 710 vpap->update_pending = 0; 711 if (va && nb < vpap->len) { 712 /* 713 * If it's now too short, it must be that userspace 714 * has changed the mappings underlying guest memory, 715 * so unregister the region. 716 */ 717 kvmppc_unpin_guest_page(kvm, va, gpa, false); 718 va = NULL; 719 } 720 *old_vpap = *vpap; 721 722 vpap->gpa = gpa; 723 vpap->pinned_addr = va; 724 vpap->dirty = false; 725 if (va) 726 vpap->pinned_end = va + vpap->len; 727} 728 729static void kvmppc_update_vpas(struct kvm_vcpu *vcpu) 730{ 731 struct kvm *kvm = vcpu->kvm; 732 struct kvmppc_vpa old_vpa = { 0 }; 733 734 if (!(vcpu->arch.vpa.update_pending || 735 vcpu->arch.slb_shadow.update_pending || 736 vcpu->arch.dtl.update_pending)) 737 return; 738 739 spin_lock(&vcpu->arch.vpa_update_lock); 740 if (vcpu->arch.vpa.update_pending) { 741 kvmppc_update_vpa(vcpu, &vcpu->arch.vpa, &old_vpa); 742 if (old_vpa.pinned_addr) { 743 if (kvmhv_is_nestedv2()) 744 kvmhv_nestedv2_set_vpa(vcpu, ~0ull); 745 kvmppc_unpin_guest_page(kvm, old_vpa.pinned_addr, old_vpa.gpa, 746 old_vpa.dirty); 747 } 748 if (vcpu->arch.vpa.pinned_addr) { 749 init_vpa(vcpu, vcpu->arch.vpa.pinned_addr); 750 if (kvmhv_is_nestedv2()) 751 kvmhv_nestedv2_set_vpa(vcpu, __pa(vcpu->arch.vpa.pinned_addr)); 752 } 753 } 754 if (vcpu->arch.dtl.update_pending) { 755 kvmppc_update_vpa(vcpu, &vcpu->arch.dtl, &old_vpa); 756 if (old_vpa.pinned_addr) 757 kvmppc_unpin_guest_page(kvm, old_vpa.pinned_addr, old_vpa.gpa, 758 old_vpa.dirty); 759 vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr; 760 vcpu->arch.dtl_index = 0; 761 } 762 if (vcpu->arch.slb_shadow.update_pending) { 763 kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow, &old_vpa); 764 if (old_vpa.pinned_addr) 765 kvmppc_unpin_guest_page(kvm, old_vpa.pinned_addr, old_vpa.gpa, 766 old_vpa.dirty); 767 } 768 769 spin_unlock(&vcpu->arch.vpa_update_lock); 770} 771 772/* 773 * Return the accumulated stolen time for the vcore up until `now'. 774 * The caller should hold the vcore lock. 775 */ 776static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now) 777{ 778 u64 p; 779 unsigned long flags; 780 781 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 782 783 spin_lock_irqsave(&vc->stoltb_lock, flags); 784 p = vc->stolen_tb; 785 if (vc->vcore_state != VCORE_INACTIVE && 786 vc->preempt_tb != TB_NIL) 787 p += now - vc->preempt_tb; 788 spin_unlock_irqrestore(&vc->stoltb_lock, flags); 789 return p; 790} 791 792static void __kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, 793 struct lppaca *vpa, 794 unsigned int pcpu, u64 now, 795 unsigned long stolen) 796{ 797 struct dtl_entry *dt; 798 799 dt = vcpu->arch.dtl_ptr; 800 801 if (!dt) 802 return; 803 804 dt->dispatch_reason = 7; 805 dt->preempt_reason = 0; 806 dt->processor_id = cpu_to_be16(pcpu + vcpu->arch.ptid); 807 dt->enqueue_to_dispatch_time = cpu_to_be32(stolen); 808 dt->ready_to_enqueue_time = 0; 809 dt->waiting_to_ready_time = 0; 810 dt->timebase = cpu_to_be64(now); 811 dt->fault_addr = 0; 812 dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu)); 813 dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr); 814 815 ++dt; 816 if (dt == vcpu->arch.dtl.pinned_end) 817 dt = vcpu->arch.dtl.pinned_addr; 818 vcpu->arch.dtl_ptr = dt; 819 /* order writing *dt vs. writing vpa->dtl_idx */ 820 smp_wmb(); 821 vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index); 822 823 /* vcpu->arch.dtl.dirty is set by the caller */ 824} 825 826static void kvmppc_update_vpa_dispatch(struct kvm_vcpu *vcpu, 827 struct kvmppc_vcore *vc) 828{ 829 struct lppaca *vpa; 830 unsigned long stolen; 831 unsigned long core_stolen; 832 u64 now; 833 unsigned long flags; 834 835 vpa = vcpu->arch.vpa.pinned_addr; 836 if (!vpa) 837 return; 838 839 now = mftb(); 840 841 core_stolen = vcore_stolen_time(vc, now); 842 stolen = core_stolen - vcpu->arch.stolen_logged; 843 vcpu->arch.stolen_logged = core_stolen; 844 spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); 845 stolen += vcpu->arch.busy_stolen; 846 vcpu->arch.busy_stolen = 0; 847 spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); 848 849 vpa->enqueue_dispatch_tb = cpu_to_be64(be64_to_cpu(vpa->enqueue_dispatch_tb) + stolen); 850 851 __kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now + kvmppc_get_tb_offset(vcpu), stolen); 852 853 vcpu->arch.vpa.dirty = true; 854} 855 856static void kvmppc_update_vpa_dispatch_p9(struct kvm_vcpu *vcpu, 857 struct kvmppc_vcore *vc, 858 u64 now) 859{ 860 struct lppaca *vpa; 861 unsigned long stolen; 862 unsigned long stolen_delta; 863 864 vpa = vcpu->arch.vpa.pinned_addr; 865 if (!vpa) 866 return; 867 868 stolen = vc->stolen_tb; 869 stolen_delta = stolen - vcpu->arch.stolen_logged; 870 vcpu->arch.stolen_logged = stolen; 871 872 vpa->enqueue_dispatch_tb = cpu_to_be64(stolen); 873 874 __kvmppc_create_dtl_entry(vcpu, vpa, vc->pcpu, now, stolen_delta); 875 876 vcpu->arch.vpa.dirty = true; 877} 878 879/* See if there is a doorbell interrupt pending for a vcpu */ 880static bool kvmppc_doorbell_pending(struct kvm_vcpu *vcpu) 881{ 882 int thr; 883 struct kvmppc_vcore *vc; 884 885 if (vcpu->arch.doorbell_request) 886 return true; 887 if (cpu_has_feature(CPU_FTR_ARCH_300)) 888 return false; 889 /* 890 * Ensure that the read of vcore->dpdes comes after the read 891 * of vcpu->doorbell_request. This barrier matches the 892 * smp_wmb() in kvmppc_guest_entry_inject(). 893 */ 894 smp_rmb(); 895 vc = vcpu->arch.vcore; 896 thr = vcpu->vcpu_id - vc->first_vcpuid; 897 return !!(vc->dpdes & (1 << thr)); 898} 899 900static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu) 901{ 902 if (kvmppc_get_arch_compat(vcpu) >= PVR_ARCH_207) 903 return true; 904 if ((!kvmppc_get_arch_compat(vcpu)) && 905 cpu_has_feature(CPU_FTR_ARCH_207S)) 906 return true; 907 return false; 908} 909 910static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags, 911 unsigned long resource, unsigned long value1, 912 unsigned long value2) 913{ 914 switch (resource) { 915 case H_SET_MODE_RESOURCE_SET_CIABR: 916 if (!kvmppc_power8_compatible(vcpu)) 917 return H_P2; 918 if (value2) 919 return H_P4; 920 if (mflags) 921 return H_UNSUPPORTED_FLAG_START; 922 /* Guests can't breakpoint the hypervisor */ 923 if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER) 924 return H_P3; 925 kvmppc_set_ciabr_hv(vcpu, value1); 926 return H_SUCCESS; 927 case H_SET_MODE_RESOURCE_SET_DAWR0: 928 if (!kvmppc_power8_compatible(vcpu)) 929 return H_P2; 930 if (!ppc_breakpoint_available()) 931 return H_P2; 932 if (mflags) 933 return H_UNSUPPORTED_FLAG_START; 934 if (value2 & DABRX_HYP) 935 return H_P4; 936 kvmppc_set_dawr0_hv(vcpu, value1); 937 kvmppc_set_dawrx0_hv(vcpu, value2); 938 return H_SUCCESS; 939 case H_SET_MODE_RESOURCE_SET_DAWR1: 940 if (!kvmppc_power8_compatible(vcpu)) 941 return H_P2; 942 if (!ppc_breakpoint_available()) 943 return H_P2; 944 if (!cpu_has_feature(CPU_FTR_DAWR1)) 945 return H_P2; 946 if (!vcpu->kvm->arch.dawr1_enabled) 947 return H_FUNCTION; 948 if (mflags) 949 return H_UNSUPPORTED_FLAG_START; 950 if (value2 & DABRX_HYP) 951 return H_P4; 952 kvmppc_set_dawr1_hv(vcpu, value1); 953 kvmppc_set_dawrx1_hv(vcpu, value2); 954 return H_SUCCESS; 955 case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE: 956 /* 957 * KVM does not support mflags=2 (AIL=2) and AIL=1 is reserved. 958 * Keep this in synch with kvmppc_filter_guest_lpcr_hv. 959 */ 960 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && 961 kvmhv_vcpu_is_radix(vcpu) && mflags == 3) 962 return H_UNSUPPORTED_FLAG_START; 963 return H_TOO_HARD; 964 default: 965 return H_TOO_HARD; 966 } 967} 968 969/* Copy guest memory in place - must reside within a single memslot */ 970static int kvmppc_copy_guest(struct kvm *kvm, gpa_t to, gpa_t from, 971 unsigned long len) 972{ 973 struct kvm_memory_slot *to_memslot = NULL; 974 struct kvm_memory_slot *from_memslot = NULL; 975 unsigned long to_addr, from_addr; 976 int r; 977 978 /* Get HPA for from address */ 979 from_memslot = gfn_to_memslot(kvm, from >> PAGE_SHIFT); 980 if (!from_memslot) 981 return -EFAULT; 982 if ((from + len) >= ((from_memslot->base_gfn + from_memslot->npages) 983 << PAGE_SHIFT)) 984 return -EINVAL; 985 from_addr = gfn_to_hva_memslot(from_memslot, from >> PAGE_SHIFT); 986 if (kvm_is_error_hva(from_addr)) 987 return -EFAULT; 988 from_addr |= (from & (PAGE_SIZE - 1)); 989 990 /* Get HPA for to address */ 991 to_memslot = gfn_to_memslot(kvm, to >> PAGE_SHIFT); 992 if (!to_memslot) 993 return -EFAULT; 994 if ((to + len) >= ((to_memslot->base_gfn + to_memslot->npages) 995 << PAGE_SHIFT)) 996 return -EINVAL; 997 to_addr = gfn_to_hva_memslot(to_memslot, to >> PAGE_SHIFT); 998 if (kvm_is_error_hva(to_addr)) 999 return -EFAULT; 1000 to_addr |= (to & (PAGE_SIZE - 1)); 1001 1002 /* Perform copy */ 1003 r = raw_copy_in_user((void __user *)to_addr, (void __user *)from_addr, 1004 len); 1005 if (r) 1006 return -EFAULT; 1007 mark_page_dirty(kvm, to >> PAGE_SHIFT); 1008 return 0; 1009} 1010 1011static long kvmppc_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags, 1012 unsigned long dest, unsigned long src) 1013{ 1014 u64 pg_sz = SZ_4K; /* 4K page size */ 1015 u64 pg_mask = SZ_4K - 1; 1016 int ret; 1017 1018 /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */ 1019 if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE | 1020 H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED)) 1021 return H_PARAMETER; 1022 1023 /* dest (and src if copy_page flag set) must be page aligned */ 1024 if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask))) 1025 return H_PARAMETER; 1026 1027 /* zero and/or copy the page as determined by the flags */ 1028 if (flags & H_COPY_PAGE) { 1029 ret = kvmppc_copy_guest(vcpu->kvm, dest, src, pg_sz); 1030 if (ret < 0) 1031 return H_PARAMETER; 1032 } else if (flags & H_ZERO_PAGE) { 1033 ret = kvm_clear_guest(vcpu->kvm, dest, pg_sz); 1034 if (ret < 0) 1035 return H_PARAMETER; 1036 } 1037 1038 /* We can ignore the remaining flags */ 1039 1040 return H_SUCCESS; 1041} 1042 1043static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target) 1044{ 1045 struct kvmppc_vcore *vcore = target->arch.vcore; 1046 1047 /* 1048 * We expect to have been called by the real mode handler 1049 * (kvmppc_rm_h_confer()) which would have directly returned 1050 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may 1051 * have useful work to do and should not confer) so we don't 1052 * recheck that here. 1053 * 1054 * In the case of the P9 single vcpu per vcore case, the real 1055 * mode handler is not called but no other threads are in the 1056 * source vcore. 1057 */ 1058 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 1059 spin_lock(&vcore->lock); 1060 if (target->arch.state == KVMPPC_VCPU_RUNNABLE && 1061 vcore->vcore_state != VCORE_INACTIVE && 1062 vcore->runner) 1063 target = vcore->runner; 1064 spin_unlock(&vcore->lock); 1065 } 1066 1067 return kvm_vcpu_yield_to(target); 1068} 1069 1070static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu) 1071{ 1072 int yield_count = 0; 1073 struct lppaca *lppaca; 1074 1075 spin_lock(&vcpu->arch.vpa_update_lock); 1076 lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr; 1077 if (lppaca) 1078 yield_count = be32_to_cpu(lppaca->yield_count); 1079 spin_unlock(&vcpu->arch.vpa_update_lock); 1080 return yield_count; 1081} 1082 1083/* 1084 * H_RPT_INVALIDATE hcall handler for nested guests. 1085 * 1086 * Handles only nested process-scoped invalidation requests in L0. 1087 */ 1088static int kvmppc_nested_h_rpt_invalidate(struct kvm_vcpu *vcpu) 1089{ 1090 unsigned long type = kvmppc_get_gpr(vcpu, 6); 1091 unsigned long pid, pg_sizes, start, end; 1092 1093 /* 1094 * The partition-scoped invalidations aren't handled here in L0. 1095 */ 1096 if (type & H_RPTI_TYPE_NESTED) 1097 return RESUME_HOST; 1098 1099 pid = kvmppc_get_gpr(vcpu, 4); 1100 pg_sizes = kvmppc_get_gpr(vcpu, 7); 1101 start = kvmppc_get_gpr(vcpu, 8); 1102 end = kvmppc_get_gpr(vcpu, 9); 1103 1104 do_h_rpt_invalidate_prt(pid, vcpu->arch.nested->shadow_lpid, 1105 type, pg_sizes, start, end); 1106 1107 kvmppc_set_gpr(vcpu, 3, H_SUCCESS); 1108 return RESUME_GUEST; 1109} 1110 1111static long kvmppc_h_rpt_invalidate(struct kvm_vcpu *vcpu, 1112 unsigned long id, unsigned long target, 1113 unsigned long type, unsigned long pg_sizes, 1114 unsigned long start, unsigned long end) 1115{ 1116 if (!kvm_is_radix(vcpu->kvm)) 1117 return H_UNSUPPORTED; 1118 1119 if (end < start) 1120 return H_P5; 1121 1122 /* 1123 * Partition-scoped invalidation for nested guests. 1124 */ 1125 if (type & H_RPTI_TYPE_NESTED) { 1126 if (!nesting_enabled(vcpu->kvm)) 1127 return H_FUNCTION; 1128 1129 /* Support only cores as target */ 1130 if (target != H_RPTI_TARGET_CMMU) 1131 return H_P2; 1132 1133 return do_h_rpt_invalidate_pat(vcpu, id, type, pg_sizes, 1134 start, end); 1135 } 1136 1137 /* 1138 * Process-scoped invalidation for L1 guests. 1139 */ 1140 do_h_rpt_invalidate_prt(id, vcpu->kvm->arch.lpid, 1141 type, pg_sizes, start, end); 1142 return H_SUCCESS; 1143} 1144 1145int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu) 1146{ 1147 struct kvm *kvm = vcpu->kvm; 1148 unsigned long req = kvmppc_get_gpr(vcpu, 3); 1149 unsigned long target, ret = H_SUCCESS; 1150 int yield_count; 1151 struct kvm_vcpu *tvcpu; 1152 int idx, rc; 1153 1154 if (req <= MAX_HCALL_OPCODE && 1155 !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls)) 1156 return RESUME_HOST; 1157 1158 switch (req) { 1159 case H_REMOVE: 1160 ret = kvmppc_h_remove(vcpu, kvmppc_get_gpr(vcpu, 4), 1161 kvmppc_get_gpr(vcpu, 5), 1162 kvmppc_get_gpr(vcpu, 6)); 1163 if (ret == H_TOO_HARD) 1164 return RESUME_HOST; 1165 break; 1166 case H_ENTER: 1167 ret = kvmppc_h_enter(vcpu, kvmppc_get_gpr(vcpu, 4), 1168 kvmppc_get_gpr(vcpu, 5), 1169 kvmppc_get_gpr(vcpu, 6), 1170 kvmppc_get_gpr(vcpu, 7)); 1171 if (ret == H_TOO_HARD) 1172 return RESUME_HOST; 1173 break; 1174 case H_READ: 1175 ret = kvmppc_h_read(vcpu, kvmppc_get_gpr(vcpu, 4), 1176 kvmppc_get_gpr(vcpu, 5)); 1177 if (ret == H_TOO_HARD) 1178 return RESUME_HOST; 1179 break; 1180 case H_CLEAR_MOD: 1181 ret = kvmppc_h_clear_mod(vcpu, kvmppc_get_gpr(vcpu, 4), 1182 kvmppc_get_gpr(vcpu, 5)); 1183 if (ret == H_TOO_HARD) 1184 return RESUME_HOST; 1185 break; 1186 case H_CLEAR_REF: 1187 ret = kvmppc_h_clear_ref(vcpu, kvmppc_get_gpr(vcpu, 4), 1188 kvmppc_get_gpr(vcpu, 5)); 1189 if (ret == H_TOO_HARD) 1190 return RESUME_HOST; 1191 break; 1192 case H_PROTECT: 1193 ret = kvmppc_h_protect(vcpu, kvmppc_get_gpr(vcpu, 4), 1194 kvmppc_get_gpr(vcpu, 5), 1195 kvmppc_get_gpr(vcpu, 6)); 1196 if (ret == H_TOO_HARD) 1197 return RESUME_HOST; 1198 break; 1199 case H_BULK_REMOVE: 1200 ret = kvmppc_h_bulk_remove(vcpu); 1201 if (ret == H_TOO_HARD) 1202 return RESUME_HOST; 1203 break; 1204 1205 case H_CEDE: 1206 break; 1207 case H_PROD: 1208 target = kvmppc_get_gpr(vcpu, 4); 1209 tvcpu = kvmppc_find_vcpu(kvm, target); 1210 if (!tvcpu) { 1211 ret = H_PARAMETER; 1212 break; 1213 } 1214 tvcpu->arch.prodded = 1; 1215 smp_mb(); /* This orders prodded store vs ceded load */ 1216 if (tvcpu->arch.ceded) 1217 kvmppc_fast_vcpu_kick_hv(tvcpu); 1218 break; 1219 case H_CONFER: 1220 target = kvmppc_get_gpr(vcpu, 4); 1221 if (target == -1) 1222 break; 1223 tvcpu = kvmppc_find_vcpu(kvm, target); 1224 if (!tvcpu) { 1225 ret = H_PARAMETER; 1226 break; 1227 } 1228 yield_count = kvmppc_get_gpr(vcpu, 5); 1229 if (kvmppc_get_yield_count(tvcpu) != yield_count) 1230 break; 1231 kvm_arch_vcpu_yield_to(tvcpu); 1232 break; 1233 case H_REGISTER_VPA: 1234 ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4), 1235 kvmppc_get_gpr(vcpu, 5), 1236 kvmppc_get_gpr(vcpu, 6)); 1237 break; 1238 case H_RTAS: 1239 if (list_empty(&kvm->arch.rtas_tokens)) 1240 return RESUME_HOST; 1241 1242 idx = srcu_read_lock(&kvm->srcu); 1243 rc = kvmppc_rtas_hcall(vcpu); 1244 srcu_read_unlock(&kvm->srcu, idx); 1245 1246 if (rc == -ENOENT) 1247 return RESUME_HOST; 1248 else if (rc == 0) 1249 break; 1250 1251 /* Send the error out to userspace via KVM_RUN */ 1252 return rc; 1253 case H_LOGICAL_CI_LOAD: 1254 ret = kvmppc_h_logical_ci_load(vcpu); 1255 if (ret == H_TOO_HARD) 1256 return RESUME_HOST; 1257 break; 1258 case H_LOGICAL_CI_STORE: 1259 ret = kvmppc_h_logical_ci_store(vcpu); 1260 if (ret == H_TOO_HARD) 1261 return RESUME_HOST; 1262 break; 1263 case H_SET_MODE: 1264 ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4), 1265 kvmppc_get_gpr(vcpu, 5), 1266 kvmppc_get_gpr(vcpu, 6), 1267 kvmppc_get_gpr(vcpu, 7)); 1268 if (ret == H_TOO_HARD) 1269 return RESUME_HOST; 1270 break; 1271 case H_XIRR: 1272 case H_CPPR: 1273 case H_EOI: 1274 case H_IPI: 1275 case H_IPOLL: 1276 case H_XIRR_X: 1277 if (kvmppc_xics_enabled(vcpu)) { 1278 if (xics_on_xive()) { 1279 ret = H_NOT_AVAILABLE; 1280 return RESUME_GUEST; 1281 } 1282 ret = kvmppc_xics_hcall(vcpu, req); 1283 break; 1284 } 1285 return RESUME_HOST; 1286 case H_SET_DABR: 1287 ret = kvmppc_h_set_dabr(vcpu, kvmppc_get_gpr(vcpu, 4)); 1288 break; 1289 case H_SET_XDABR: 1290 ret = kvmppc_h_set_xdabr(vcpu, kvmppc_get_gpr(vcpu, 4), 1291 kvmppc_get_gpr(vcpu, 5)); 1292 break; 1293#ifdef CONFIG_SPAPR_TCE_IOMMU 1294 case H_GET_TCE: 1295 ret = kvmppc_h_get_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1296 kvmppc_get_gpr(vcpu, 5)); 1297 if (ret == H_TOO_HARD) 1298 return RESUME_HOST; 1299 break; 1300 case H_PUT_TCE: 1301 ret = kvmppc_h_put_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1302 kvmppc_get_gpr(vcpu, 5), 1303 kvmppc_get_gpr(vcpu, 6)); 1304 if (ret == H_TOO_HARD) 1305 return RESUME_HOST; 1306 break; 1307 case H_PUT_TCE_INDIRECT: 1308 ret = kvmppc_h_put_tce_indirect(vcpu, kvmppc_get_gpr(vcpu, 4), 1309 kvmppc_get_gpr(vcpu, 5), 1310 kvmppc_get_gpr(vcpu, 6), 1311 kvmppc_get_gpr(vcpu, 7)); 1312 if (ret == H_TOO_HARD) 1313 return RESUME_HOST; 1314 break; 1315 case H_STUFF_TCE: 1316 ret = kvmppc_h_stuff_tce(vcpu, kvmppc_get_gpr(vcpu, 4), 1317 kvmppc_get_gpr(vcpu, 5), 1318 kvmppc_get_gpr(vcpu, 6), 1319 kvmppc_get_gpr(vcpu, 7)); 1320 if (ret == H_TOO_HARD) 1321 return RESUME_HOST; 1322 break; 1323#endif 1324 case H_RANDOM: { 1325 unsigned long rand; 1326 1327 if (!arch_get_random_seed_longs(&rand, 1)) 1328 ret = H_HARDWARE; 1329 kvmppc_set_gpr(vcpu, 4, rand); 1330 break; 1331 } 1332 case H_RPT_INVALIDATE: 1333 ret = kvmppc_h_rpt_invalidate(vcpu, kvmppc_get_gpr(vcpu, 4), 1334 kvmppc_get_gpr(vcpu, 5), 1335 kvmppc_get_gpr(vcpu, 6), 1336 kvmppc_get_gpr(vcpu, 7), 1337 kvmppc_get_gpr(vcpu, 8), 1338 kvmppc_get_gpr(vcpu, 9)); 1339 break; 1340 1341 case H_SET_PARTITION_TABLE: 1342 ret = H_FUNCTION; 1343 if (nesting_enabled(kvm)) 1344 ret = kvmhv_set_partition_table(vcpu); 1345 break; 1346 case H_ENTER_NESTED: 1347 ret = H_FUNCTION; 1348 if (!nesting_enabled(kvm)) 1349 break; 1350 ret = kvmhv_enter_nested_guest(vcpu); 1351 if (ret == H_INTERRUPT) { 1352 kvmppc_set_gpr(vcpu, 3, 0); 1353 vcpu->arch.hcall_needed = 0; 1354 return -EINTR; 1355 } else if (ret == H_TOO_HARD) { 1356 kvmppc_set_gpr(vcpu, 3, 0); 1357 vcpu->arch.hcall_needed = 0; 1358 return RESUME_HOST; 1359 } 1360 break; 1361 case H_TLB_INVALIDATE: 1362 ret = H_FUNCTION; 1363 if (nesting_enabled(kvm)) 1364 ret = kvmhv_do_nested_tlbie(vcpu); 1365 break; 1366 case H_COPY_TOFROM_GUEST: 1367 ret = H_FUNCTION; 1368 if (nesting_enabled(kvm)) 1369 ret = kvmhv_copy_tofrom_guest_nested(vcpu); 1370 break; 1371 case H_PAGE_INIT: 1372 ret = kvmppc_h_page_init(vcpu, kvmppc_get_gpr(vcpu, 4), 1373 kvmppc_get_gpr(vcpu, 5), 1374 kvmppc_get_gpr(vcpu, 6)); 1375 break; 1376 case H_SVM_PAGE_IN: 1377 ret = H_UNSUPPORTED; 1378 if (kvmppc_get_srr1(vcpu) & MSR_S) 1379 ret = kvmppc_h_svm_page_in(kvm, 1380 kvmppc_get_gpr(vcpu, 4), 1381 kvmppc_get_gpr(vcpu, 5), 1382 kvmppc_get_gpr(vcpu, 6)); 1383 break; 1384 case H_SVM_PAGE_OUT: 1385 ret = H_UNSUPPORTED; 1386 if (kvmppc_get_srr1(vcpu) & MSR_S) 1387 ret = kvmppc_h_svm_page_out(kvm, 1388 kvmppc_get_gpr(vcpu, 4), 1389 kvmppc_get_gpr(vcpu, 5), 1390 kvmppc_get_gpr(vcpu, 6)); 1391 break; 1392 case H_SVM_INIT_START: 1393 ret = H_UNSUPPORTED; 1394 if (kvmppc_get_srr1(vcpu) & MSR_S) 1395 ret = kvmppc_h_svm_init_start(kvm); 1396 break; 1397 case H_SVM_INIT_DONE: 1398 ret = H_UNSUPPORTED; 1399 if (kvmppc_get_srr1(vcpu) & MSR_S) 1400 ret = kvmppc_h_svm_init_done(kvm); 1401 break; 1402 case H_SVM_INIT_ABORT: 1403 /* 1404 * Even if that call is made by the Ultravisor, the SSR1 value 1405 * is the guest context one, with the secure bit clear as it has 1406 * not yet been secured. So we can't check it here. 1407 * Instead the kvm->arch.secure_guest flag is checked inside 1408 * kvmppc_h_svm_init_abort(). 1409 */ 1410 ret = kvmppc_h_svm_init_abort(kvm); 1411 break; 1412 1413 default: 1414 return RESUME_HOST; 1415 } 1416 WARN_ON_ONCE(ret == H_TOO_HARD); 1417 kvmppc_set_gpr(vcpu, 3, ret); 1418 vcpu->arch.hcall_needed = 0; 1419 return RESUME_GUEST; 1420} 1421 1422/* 1423 * Handle H_CEDE in the P9 path where we don't call the real-mode hcall 1424 * handlers in book3s_hv_rmhandlers.S. 1425 * 1426 * This has to be done early, not in kvmppc_pseries_do_hcall(), so 1427 * that the cede logic in kvmppc_run_single_vcpu() works properly. 1428 */ 1429static void kvmppc_cede(struct kvm_vcpu *vcpu) 1430{ 1431 __kvmppc_set_msr_hv(vcpu, __kvmppc_get_msr_hv(vcpu) | MSR_EE); 1432 vcpu->arch.ceded = 1; 1433 smp_mb(); 1434 if (vcpu->arch.prodded) { 1435 vcpu->arch.prodded = 0; 1436 smp_mb(); 1437 vcpu->arch.ceded = 0; 1438 } 1439} 1440 1441static int kvmppc_hcall_impl_hv(unsigned long cmd) 1442{ 1443 switch (cmd) { 1444 case H_CEDE: 1445 case H_PROD: 1446 case H_CONFER: 1447 case H_REGISTER_VPA: 1448 case H_SET_MODE: 1449#ifdef CONFIG_SPAPR_TCE_IOMMU 1450 case H_GET_TCE: 1451 case H_PUT_TCE: 1452 case H_PUT_TCE_INDIRECT: 1453 case H_STUFF_TCE: 1454#endif 1455 case H_LOGICAL_CI_LOAD: 1456 case H_LOGICAL_CI_STORE: 1457#ifdef CONFIG_KVM_XICS 1458 case H_XIRR: 1459 case H_CPPR: 1460 case H_EOI: 1461 case H_IPI: 1462 case H_IPOLL: 1463 case H_XIRR_X: 1464#endif 1465 case H_PAGE_INIT: 1466 case H_RPT_INVALIDATE: 1467 return 1; 1468 } 1469 1470 /* See if it's in the real-mode table */ 1471 return kvmppc_hcall_impl_hv_realmode(cmd); 1472} 1473 1474static int kvmppc_emulate_debug_inst(struct kvm_vcpu *vcpu) 1475{ 1476 ppc_inst_t last_inst; 1477 1478 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) != 1479 EMULATE_DONE) { 1480 /* 1481 * Fetch failed, so return to guest and 1482 * try executing it again. 1483 */ 1484 return RESUME_GUEST; 1485 } 1486 1487 if (ppc_inst_val(last_inst) == KVMPPC_INST_SW_BREAKPOINT) { 1488 vcpu->run->exit_reason = KVM_EXIT_DEBUG; 1489 vcpu->run->debug.arch.address = kvmppc_get_pc(vcpu); 1490 return RESUME_HOST; 1491 } else { 1492 kvmppc_core_queue_program(vcpu, SRR1_PROGILL | 1493 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1494 return RESUME_GUEST; 1495 } 1496} 1497 1498static void do_nothing(void *x) 1499{ 1500} 1501 1502static unsigned long kvmppc_read_dpdes(struct kvm_vcpu *vcpu) 1503{ 1504 int thr, cpu, pcpu, nthreads; 1505 struct kvm_vcpu *v; 1506 unsigned long dpdes; 1507 1508 nthreads = vcpu->kvm->arch.emul_smt_mode; 1509 dpdes = 0; 1510 cpu = vcpu->vcpu_id & ~(nthreads - 1); 1511 for (thr = 0; thr < nthreads; ++thr, ++cpu) { 1512 v = kvmppc_find_vcpu(vcpu->kvm, cpu); 1513 if (!v) 1514 continue; 1515 /* 1516 * If the vcpu is currently running on a physical cpu thread, 1517 * interrupt it in order to pull it out of the guest briefly, 1518 * which will update its vcore->dpdes value. 1519 */ 1520 pcpu = READ_ONCE(v->cpu); 1521 if (pcpu >= 0) 1522 smp_call_function_single(pcpu, do_nothing, NULL, 1); 1523 if (kvmppc_doorbell_pending(v)) 1524 dpdes |= 1 << thr; 1525 } 1526 return dpdes; 1527} 1528 1529/* 1530 * On POWER9, emulate doorbell-related instructions in order to 1531 * give the guest the illusion of running on a multi-threaded core. 1532 * The instructions emulated are msgsndp, msgclrp, mfspr TIR, 1533 * and mfspr DPDES. 1534 */ 1535static int kvmppc_emulate_doorbell_instr(struct kvm_vcpu *vcpu) 1536{ 1537 u32 inst, rb, thr; 1538 unsigned long arg; 1539 struct kvm *kvm = vcpu->kvm; 1540 struct kvm_vcpu *tvcpu; 1541 ppc_inst_t pinst; 1542 1543 if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &pinst) != EMULATE_DONE) 1544 return RESUME_GUEST; 1545 inst = ppc_inst_val(pinst); 1546 if (get_op(inst) != 31) 1547 return EMULATE_FAIL; 1548 rb = get_rb(inst); 1549 thr = vcpu->vcpu_id & (kvm->arch.emul_smt_mode - 1); 1550 switch (get_xop(inst)) { 1551 case OP_31_XOP_MSGSNDP: 1552 arg = kvmppc_get_gpr(vcpu, rb); 1553 if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) 1554 break; 1555 arg &= 0x7f; 1556 if (arg >= kvm->arch.emul_smt_mode) 1557 break; 1558 tvcpu = kvmppc_find_vcpu(kvm, vcpu->vcpu_id - thr + arg); 1559 if (!tvcpu) 1560 break; 1561 if (!tvcpu->arch.doorbell_request) { 1562 tvcpu->arch.doorbell_request = 1; 1563 kvmppc_fast_vcpu_kick_hv(tvcpu); 1564 } 1565 break; 1566 case OP_31_XOP_MSGCLRP: 1567 arg = kvmppc_get_gpr(vcpu, rb); 1568 if (((arg >> 27) & 0x1f) != PPC_DBELL_SERVER) 1569 break; 1570 vcpu->arch.vcore->dpdes = 0; 1571 vcpu->arch.doorbell_request = 0; 1572 break; 1573 case OP_31_XOP_MFSPR: 1574 switch (get_sprn(inst)) { 1575 case SPRN_TIR: 1576 arg = thr; 1577 break; 1578 case SPRN_DPDES: 1579 arg = kvmppc_read_dpdes(vcpu); 1580 break; 1581 default: 1582 return EMULATE_FAIL; 1583 } 1584 kvmppc_set_gpr(vcpu, get_rt(inst), arg); 1585 break; 1586 default: 1587 return EMULATE_FAIL; 1588 } 1589 kvmppc_set_pc(vcpu, kvmppc_get_pc(vcpu) + 4); 1590 return RESUME_GUEST; 1591} 1592 1593/* 1594 * If the lppaca had pmcregs_in_use clear when we exited the guest, then 1595 * HFSCR_PM is cleared for next entry. If the guest then tries to access 1596 * the PMU SPRs, we get this facility unavailable interrupt. Putting HFSCR_PM 1597 * back in the guest HFSCR will cause the next entry to load the PMU SPRs and 1598 * allow the guest access to continue. 1599 */ 1600static int kvmppc_pmu_unavailable(struct kvm_vcpu *vcpu) 1601{ 1602 if (!(vcpu->arch.hfscr_permitted & HFSCR_PM)) 1603 return EMULATE_FAIL; 1604 1605 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_PM); 1606 1607 return RESUME_GUEST; 1608} 1609 1610static int kvmppc_ebb_unavailable(struct kvm_vcpu *vcpu) 1611{ 1612 if (!(vcpu->arch.hfscr_permitted & HFSCR_EBB)) 1613 return EMULATE_FAIL; 1614 1615 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_EBB); 1616 1617 return RESUME_GUEST; 1618} 1619 1620static int kvmppc_tm_unavailable(struct kvm_vcpu *vcpu) 1621{ 1622 if (!(vcpu->arch.hfscr_permitted & HFSCR_TM)) 1623 return EMULATE_FAIL; 1624 1625 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_TM); 1626 1627 return RESUME_GUEST; 1628} 1629 1630static int kvmppc_handle_exit_hv(struct kvm_vcpu *vcpu, 1631 struct task_struct *tsk) 1632{ 1633 struct kvm_run *run = vcpu->run; 1634 int r = RESUME_HOST; 1635 1636 vcpu->stat.sum_exits++; 1637 1638 /* 1639 * This can happen if an interrupt occurs in the last stages 1640 * of guest entry or the first stages of guest exit (i.e. after 1641 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 1642 * and before setting it to KVM_GUEST_MODE_HOST_HV). 1643 * That can happen due to a bug, or due to a machine check 1644 * occurring at just the wrong time. 1645 */ 1646 if (!kvmhv_is_nestedv2() && (__kvmppc_get_msr_hv(vcpu) & MSR_HV)) { 1647 printk(KERN_EMERG "KVM trap in HV mode!\n"); 1648 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1649 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1650 vcpu->arch.shregs.msr); 1651 kvmppc_dump_regs(vcpu); 1652 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 1653 run->hw.hardware_exit_reason = vcpu->arch.trap; 1654 return RESUME_HOST; 1655 } 1656 run->exit_reason = KVM_EXIT_UNKNOWN; 1657 run->ready_for_interrupt_injection = 1; 1658 switch (vcpu->arch.trap) { 1659 /* We're good on these - the host merely wanted to get our attention */ 1660 case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER: 1661 WARN_ON_ONCE(1); /* Should never happen */ 1662 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; 1663 fallthrough; 1664 case BOOK3S_INTERRUPT_HV_DECREMENTER: 1665 vcpu->stat.dec_exits++; 1666 r = RESUME_GUEST; 1667 break; 1668 case BOOK3S_INTERRUPT_EXTERNAL: 1669 case BOOK3S_INTERRUPT_H_DOORBELL: 1670 case BOOK3S_INTERRUPT_H_VIRT: 1671 vcpu->stat.ext_intr_exits++; 1672 r = RESUME_GUEST; 1673 break; 1674 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ 1675 case BOOK3S_INTERRUPT_HMI: 1676 case BOOK3S_INTERRUPT_PERFMON: 1677 case BOOK3S_INTERRUPT_SYSTEM_RESET: 1678 r = RESUME_GUEST; 1679 break; 1680 case BOOK3S_INTERRUPT_MACHINE_CHECK: { 1681 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, 1682 DEFAULT_RATELIMIT_BURST); 1683 /* 1684 * Print the MCE event to host console. Ratelimit so the guest 1685 * can't flood the host log. 1686 */ 1687 if (__ratelimit(&rs)) 1688 machine_check_print_event_info(&vcpu->arch.mce_evt,false, true); 1689 1690 /* 1691 * If the guest can do FWNMI, exit to userspace so it can 1692 * deliver a FWNMI to the guest. 1693 * Otherwise we synthesize a machine check for the guest 1694 * so that it knows that the machine check occurred. 1695 */ 1696 if (!vcpu->kvm->arch.fwnmi_enabled) { 1697 ulong flags = (__kvmppc_get_msr_hv(vcpu) & 0x083c0000) | 1698 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED); 1699 kvmppc_core_queue_machine_check(vcpu, flags); 1700 r = RESUME_GUEST; 1701 break; 1702 } 1703 1704 /* Exit to guest with KVM_EXIT_NMI as exit reason */ 1705 run->exit_reason = KVM_EXIT_NMI; 1706 run->hw.hardware_exit_reason = vcpu->arch.trap; 1707 /* Clear out the old NMI status from run->flags */ 1708 run->flags &= ~KVM_RUN_PPC_NMI_DISP_MASK; 1709 /* Now set the NMI status */ 1710 if (vcpu->arch.mce_evt.disposition == MCE_DISPOSITION_RECOVERED) 1711 run->flags |= KVM_RUN_PPC_NMI_DISP_FULLY_RECOV; 1712 else 1713 run->flags |= KVM_RUN_PPC_NMI_DISP_NOT_RECOV; 1714 1715 r = RESUME_HOST; 1716 break; 1717 } 1718 case BOOK3S_INTERRUPT_PROGRAM: 1719 { 1720 ulong flags; 1721 /* 1722 * Normally program interrupts are delivered directly 1723 * to the guest by the hardware, but we can get here 1724 * as a result of a hypervisor emulation interrupt 1725 * (e40) getting turned into a 700 by BML RTAS. 1726 */ 1727 flags = (__kvmppc_get_msr_hv(vcpu) & 0x1f0000ull) | 1728 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED); 1729 kvmppc_core_queue_program(vcpu, flags); 1730 r = RESUME_GUEST; 1731 break; 1732 } 1733 case BOOK3S_INTERRUPT_SYSCALL: 1734 { 1735 int i; 1736 1737 if (!kvmhv_is_nestedv2() && unlikely(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) { 1738 /* 1739 * Guest userspace executed sc 1. This can only be 1740 * reached by the P9 path because the old path 1741 * handles this case in realmode hcall handlers. 1742 */ 1743 if (!kvmhv_vcpu_is_radix(vcpu)) { 1744 /* 1745 * A guest could be running PR KVM, so this 1746 * may be a PR KVM hcall. It must be reflected 1747 * to the guest kernel as a sc interrupt. 1748 */ 1749 kvmppc_core_queue_syscall(vcpu); 1750 } else { 1751 /* 1752 * Radix guests can not run PR KVM or nested HV 1753 * hash guests which might run PR KVM, so this 1754 * is always a privilege fault. Send a program 1755 * check to guest kernel. 1756 */ 1757 kvmppc_core_queue_program(vcpu, SRR1_PROGPRIV); 1758 } 1759 r = RESUME_GUEST; 1760 break; 1761 } 1762 1763 /* 1764 * hcall - gather args and set exit_reason. This will next be 1765 * handled by kvmppc_pseries_do_hcall which may be able to deal 1766 * with it and resume guest, or may punt to userspace. 1767 */ 1768 run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); 1769 for (i = 0; i < 9; ++i) 1770 run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); 1771 run->exit_reason = KVM_EXIT_PAPR_HCALL; 1772 vcpu->arch.hcall_needed = 1; 1773 r = RESUME_HOST; 1774 break; 1775 } 1776 /* 1777 * We get these next two if the guest accesses a page which it thinks 1778 * it has mapped but which is not actually present, either because 1779 * it is for an emulated I/O device or because the corresonding 1780 * host page has been paged out. 1781 * 1782 * Any other HDSI/HISI interrupts have been handled already for P7/8 1783 * guests. For POWER9 hash guests not using rmhandlers, basic hash 1784 * fault handling is done here. 1785 */ 1786 case BOOK3S_INTERRUPT_H_DATA_STORAGE: { 1787 unsigned long vsid; 1788 long err; 1789 1790 if (cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG) && 1791 unlikely(vcpu->arch.fault_dsisr == HDSISR_CANARY)) { 1792 r = RESUME_GUEST; /* Just retry if it's the canary */ 1793 break; 1794 } 1795 1796 if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { 1797 /* 1798 * Radix doesn't require anything, and pre-ISAv3.0 hash 1799 * already attempted to handle this in rmhandlers. The 1800 * hash fault handling below is v3 only (it uses ASDR 1801 * via fault_gpa). 1802 */ 1803 r = RESUME_PAGE_FAULT; 1804 break; 1805 } 1806 1807 if (!(vcpu->arch.fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT))) { 1808 kvmppc_core_queue_data_storage(vcpu, 1809 kvmppc_get_msr(vcpu) & SRR1_PREFIXED, 1810 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 1811 r = RESUME_GUEST; 1812 break; 1813 } 1814 1815 if (!(__kvmppc_get_msr_hv(vcpu) & MSR_DR)) 1816 vsid = vcpu->kvm->arch.vrma_slb_v; 1817 else 1818 vsid = vcpu->arch.fault_gpa; 1819 1820 err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, 1821 vsid, vcpu->arch.fault_dsisr, true); 1822 if (err == 0) { 1823 r = RESUME_GUEST; 1824 } else if (err == -1 || err == -2) { 1825 r = RESUME_PAGE_FAULT; 1826 } else { 1827 kvmppc_core_queue_data_storage(vcpu, 1828 kvmppc_get_msr(vcpu) & SRR1_PREFIXED, 1829 vcpu->arch.fault_dar, err); 1830 r = RESUME_GUEST; 1831 } 1832 break; 1833 } 1834 case BOOK3S_INTERRUPT_H_INST_STORAGE: { 1835 unsigned long vsid; 1836 long err; 1837 1838 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 1839 vcpu->arch.fault_dsisr = __kvmppc_get_msr_hv(vcpu) & 1840 DSISR_SRR1_MATCH_64S; 1841 if (kvm_is_radix(vcpu->kvm) || !cpu_has_feature(CPU_FTR_ARCH_300)) { 1842 /* 1843 * Radix doesn't require anything, and pre-ISAv3.0 hash 1844 * already attempted to handle this in rmhandlers. The 1845 * hash fault handling below is v3 only (it uses ASDR 1846 * via fault_gpa). 1847 */ 1848 if (__kvmppc_get_msr_hv(vcpu) & HSRR1_HISI_WRITE) 1849 vcpu->arch.fault_dsisr |= DSISR_ISSTORE; 1850 r = RESUME_PAGE_FAULT; 1851 break; 1852 } 1853 1854 if (!(vcpu->arch.fault_dsisr & SRR1_ISI_NOPT)) { 1855 kvmppc_core_queue_inst_storage(vcpu, 1856 vcpu->arch.fault_dsisr | 1857 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1858 r = RESUME_GUEST; 1859 break; 1860 } 1861 1862 if (!(__kvmppc_get_msr_hv(vcpu) & MSR_IR)) 1863 vsid = vcpu->kvm->arch.vrma_slb_v; 1864 else 1865 vsid = vcpu->arch.fault_gpa; 1866 1867 err = kvmppc_hpte_hv_fault(vcpu, vcpu->arch.fault_dar, 1868 vsid, vcpu->arch.fault_dsisr, false); 1869 if (err == 0) { 1870 r = RESUME_GUEST; 1871 } else if (err == -1) { 1872 r = RESUME_PAGE_FAULT; 1873 } else { 1874 kvmppc_core_queue_inst_storage(vcpu, 1875 err | (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1876 r = RESUME_GUEST; 1877 } 1878 break; 1879 } 1880 1881 /* 1882 * This occurs if the guest executes an illegal instruction. 1883 * If the guest debug is disabled, generate a program interrupt 1884 * to the guest. If guest debug is enabled, we need to check 1885 * whether the instruction is a software breakpoint instruction. 1886 * Accordingly return to Guest or Host. 1887 */ 1888 case BOOK3S_INTERRUPT_H_EMUL_ASSIST: 1889 if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED) 1890 vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ? 1891 swab32(vcpu->arch.emul_inst) : 1892 vcpu->arch.emul_inst; 1893 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) { 1894 r = kvmppc_emulate_debug_inst(vcpu); 1895 } else { 1896 kvmppc_core_queue_program(vcpu, SRR1_PROGILL | 1897 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1898 r = RESUME_GUEST; 1899 } 1900 break; 1901 1902#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 1903 case BOOK3S_INTERRUPT_HV_SOFTPATCH: 1904 /* 1905 * This occurs for various TM-related instructions that 1906 * we need to emulate on POWER9 DD2.2. We have already 1907 * handled the cases where the guest was in real-suspend 1908 * mode and was transitioning to transactional state. 1909 */ 1910 r = kvmhv_p9_tm_emulation(vcpu); 1911 if (r != -1) 1912 break; 1913 fallthrough; /* go to facility unavailable handler */ 1914#endif 1915 1916 /* 1917 * This occurs if the guest (kernel or userspace), does something that 1918 * is prohibited by HFSCR. 1919 * On POWER9, this could be a doorbell instruction that we need 1920 * to emulate. 1921 * Otherwise, we just generate a program interrupt to the guest. 1922 */ 1923 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: { 1924 u64 cause = kvmppc_get_hfscr_hv(vcpu) >> 56; 1925 1926 r = EMULATE_FAIL; 1927 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 1928 switch (cause) { 1929 case FSCR_MSGP_LG: 1930 r = kvmppc_emulate_doorbell_instr(vcpu); 1931 break; 1932 case FSCR_PM_LG: 1933 r = kvmppc_pmu_unavailable(vcpu); 1934 break; 1935 case FSCR_EBB_LG: 1936 r = kvmppc_ebb_unavailable(vcpu); 1937 break; 1938 case FSCR_TM_LG: 1939 r = kvmppc_tm_unavailable(vcpu); 1940 break; 1941 default: 1942 break; 1943 } 1944 } 1945 if (r == EMULATE_FAIL) { 1946 kvmppc_core_queue_program(vcpu, SRR1_PROGILL | 1947 (kvmppc_get_msr(vcpu) & SRR1_PREFIXED)); 1948 r = RESUME_GUEST; 1949 } 1950 break; 1951 } 1952 1953 case BOOK3S_INTERRUPT_HV_RM_HARD: 1954 r = RESUME_PASSTHROUGH; 1955 break; 1956 default: 1957 kvmppc_dump_regs(vcpu); 1958 printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1959 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1960 __kvmppc_get_msr_hv(vcpu)); 1961 run->hw.hardware_exit_reason = vcpu->arch.trap; 1962 r = RESUME_HOST; 1963 break; 1964 } 1965 1966 return r; 1967} 1968 1969static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu) 1970{ 1971 int r; 1972 int srcu_idx; 1973 1974 vcpu->stat.sum_exits++; 1975 1976 /* 1977 * This can happen if an interrupt occurs in the last stages 1978 * of guest entry or the first stages of guest exit (i.e. after 1979 * setting paca->kvm_hstate.in_guest to KVM_GUEST_MODE_GUEST_HV 1980 * and before setting it to KVM_GUEST_MODE_HOST_HV). 1981 * That can happen due to a bug, or due to a machine check 1982 * occurring at just the wrong time. 1983 */ 1984 if (__kvmppc_get_msr_hv(vcpu) & MSR_HV) { 1985 pr_emerg("KVM trap in HV mode while nested!\n"); 1986 pr_emerg("trap=0x%x | pc=0x%lx | msr=0x%llx\n", 1987 vcpu->arch.trap, kvmppc_get_pc(vcpu), 1988 __kvmppc_get_msr_hv(vcpu)); 1989 kvmppc_dump_regs(vcpu); 1990 return RESUME_HOST; 1991 } 1992 switch (vcpu->arch.trap) { 1993 /* We're good on these - the host merely wanted to get our attention */ 1994 case BOOK3S_INTERRUPT_HV_DECREMENTER: 1995 vcpu->stat.dec_exits++; 1996 r = RESUME_GUEST; 1997 break; 1998 case BOOK3S_INTERRUPT_EXTERNAL: 1999 vcpu->stat.ext_intr_exits++; 2000 r = RESUME_HOST; 2001 break; 2002 case BOOK3S_INTERRUPT_H_DOORBELL: 2003 case BOOK3S_INTERRUPT_H_VIRT: 2004 vcpu->stat.ext_intr_exits++; 2005 r = RESUME_GUEST; 2006 break; 2007 /* These need to go to the nested HV */ 2008 case BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER: 2009 vcpu->arch.trap = BOOK3S_INTERRUPT_HV_DECREMENTER; 2010 vcpu->stat.dec_exits++; 2011 r = RESUME_HOST; 2012 break; 2013 /* SR/HMI/PMI are HV interrupts that host has handled. Resume guest.*/ 2014 case BOOK3S_INTERRUPT_HMI: 2015 case BOOK3S_INTERRUPT_PERFMON: 2016 case BOOK3S_INTERRUPT_SYSTEM_RESET: 2017 r = RESUME_GUEST; 2018 break; 2019 case BOOK3S_INTERRUPT_MACHINE_CHECK: 2020 { 2021 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL, 2022 DEFAULT_RATELIMIT_BURST); 2023 /* Pass the machine check to the L1 guest */ 2024 r = RESUME_HOST; 2025 /* Print the MCE event to host console. */ 2026 if (__ratelimit(&rs)) 2027 machine_check_print_event_info(&vcpu->arch.mce_evt, false, true); 2028 break; 2029 } 2030 /* 2031 * We get these next two if the guest accesses a page which it thinks 2032 * it has mapped but which is not actually present, either because 2033 * it is for an emulated I/O device or because the corresonding 2034 * host page has been paged out. 2035 */ 2036 case BOOK3S_INTERRUPT_H_DATA_STORAGE: 2037 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 2038 r = kvmhv_nested_page_fault(vcpu); 2039 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 2040 break; 2041 case BOOK3S_INTERRUPT_H_INST_STORAGE: 2042 vcpu->arch.fault_dar = kvmppc_get_pc(vcpu); 2043 vcpu->arch.fault_dsisr = kvmppc_get_msr(vcpu) & 2044 DSISR_SRR1_MATCH_64S; 2045 if (__kvmppc_get_msr_hv(vcpu) & HSRR1_HISI_WRITE) 2046 vcpu->arch.fault_dsisr |= DSISR_ISSTORE; 2047 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 2048 r = kvmhv_nested_page_fault(vcpu); 2049 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 2050 break; 2051 2052#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2053 case BOOK3S_INTERRUPT_HV_SOFTPATCH: 2054 /* 2055 * This occurs for various TM-related instructions that 2056 * we need to emulate on POWER9 DD2.2. We have already 2057 * handled the cases where the guest was in real-suspend 2058 * mode and was transitioning to transactional state. 2059 */ 2060 r = kvmhv_p9_tm_emulation(vcpu); 2061 if (r != -1) 2062 break; 2063 fallthrough; /* go to facility unavailable handler */ 2064#endif 2065 2066 case BOOK3S_INTERRUPT_H_FAC_UNAVAIL: 2067 r = RESUME_HOST; 2068 break; 2069 2070 case BOOK3S_INTERRUPT_HV_RM_HARD: 2071 vcpu->arch.trap = 0; 2072 r = RESUME_GUEST; 2073 if (!xics_on_xive()) 2074 kvmppc_xics_rm_complete(vcpu, 0); 2075 break; 2076 case BOOK3S_INTERRUPT_SYSCALL: 2077 { 2078 unsigned long req = kvmppc_get_gpr(vcpu, 3); 2079 2080 /* 2081 * The H_RPT_INVALIDATE hcalls issued by nested 2082 * guests for process-scoped invalidations when 2083 * GTSE=0, are handled here in L0. 2084 */ 2085 if (req == H_RPT_INVALIDATE) { 2086 r = kvmppc_nested_h_rpt_invalidate(vcpu); 2087 break; 2088 } 2089 2090 r = RESUME_HOST; 2091 break; 2092 } 2093 default: 2094 r = RESUME_HOST; 2095 break; 2096 } 2097 2098 return r; 2099} 2100 2101static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu, 2102 struct kvm_sregs *sregs) 2103{ 2104 int i; 2105 2106 memset(sregs, 0, sizeof(struct kvm_sregs)); 2107 sregs->pvr = vcpu->arch.pvr; 2108 for (i = 0; i < vcpu->arch.slb_max; i++) { 2109 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige; 2110 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv; 2111 } 2112 2113 return 0; 2114} 2115 2116static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu, 2117 struct kvm_sregs *sregs) 2118{ 2119 int i, j; 2120 2121 /* Only accept the same PVR as the host's, since we can't spoof it */ 2122 if (sregs->pvr != vcpu->arch.pvr) 2123 return -EINVAL; 2124 2125 j = 0; 2126 for (i = 0; i < vcpu->arch.slb_nr; i++) { 2127 if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) { 2128 vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe; 2129 vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv; 2130 ++j; 2131 } 2132 } 2133 vcpu->arch.slb_max = j; 2134 2135 return 0; 2136} 2137 2138/* 2139 * Enforce limits on guest LPCR values based on hardware availability, 2140 * guest configuration, and possibly hypervisor support and security 2141 * concerns. 2142 */ 2143unsigned long kvmppc_filter_lpcr_hv(struct kvm *kvm, unsigned long lpcr) 2144{ 2145 /* LPCR_TC only applies to HPT guests */ 2146 if (kvm_is_radix(kvm)) 2147 lpcr &= ~LPCR_TC; 2148 2149 /* On POWER8 and above, userspace can modify AIL */ 2150 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 2151 lpcr &= ~LPCR_AIL; 2152 if ((lpcr & LPCR_AIL) != LPCR_AIL_3) 2153 lpcr &= ~LPCR_AIL; /* LPCR[AIL]=1/2 is disallowed */ 2154 /* 2155 * On some POWER9s we force AIL off for radix guests to prevent 2156 * executing in MSR[HV]=1 mode with the MMU enabled and PIDR set to 2157 * guest, which can result in Q0 translations with LPID=0 PID=PIDR to 2158 * be cached, which the host TLB management does not expect. 2159 */ 2160 if (kvm_is_radix(kvm) && cpu_has_feature(CPU_FTR_P9_RADIX_PREFETCH_BUG)) 2161 lpcr &= ~LPCR_AIL; 2162 2163 /* 2164 * On POWER9, allow userspace to enable large decrementer for the 2165 * guest, whether or not the host has it enabled. 2166 */ 2167 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 2168 lpcr &= ~LPCR_LD; 2169 2170 return lpcr; 2171} 2172 2173static void verify_lpcr(struct kvm *kvm, unsigned long lpcr) 2174{ 2175 if (lpcr != kvmppc_filter_lpcr_hv(kvm, lpcr)) { 2176 WARN_ONCE(1, "lpcr 0x%lx differs from filtered 0x%lx\n", 2177 lpcr, kvmppc_filter_lpcr_hv(kvm, lpcr)); 2178 } 2179} 2180 2181static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr, 2182 bool preserve_top32) 2183{ 2184 struct kvm *kvm = vcpu->kvm; 2185 struct kvmppc_vcore *vc = vcpu->arch.vcore; 2186 u64 mask; 2187 2188 spin_lock(&vc->lock); 2189 2190 /* 2191 * Userspace can only modify 2192 * DPFD (default prefetch depth), ILE (interrupt little-endian), 2193 * TC (translation control), AIL (alternate interrupt location), 2194 * LD (large decrementer). 2195 * These are subject to restrictions from kvmppc_filter_lcpr_hv(). 2196 */ 2197 mask = LPCR_DPFD | LPCR_ILE | LPCR_TC | LPCR_AIL | LPCR_LD; 2198 2199 /* Broken 32-bit version of LPCR must not clear top bits */ 2200 if (preserve_top32) 2201 mask &= 0xFFFFFFFF; 2202 2203 new_lpcr = kvmppc_filter_lpcr_hv(kvm, 2204 (vc->lpcr & ~mask) | (new_lpcr & mask)); 2205 2206 /* 2207 * If ILE (interrupt little-endian) has changed, update the 2208 * MSR_LE bit in the intr_msr for each vcpu in this vcore. 2209 */ 2210 if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) { 2211 struct kvm_vcpu *vcpu; 2212 unsigned long i; 2213 2214 kvm_for_each_vcpu(i, vcpu, kvm) { 2215 if (vcpu->arch.vcore != vc) 2216 continue; 2217 if (new_lpcr & LPCR_ILE) 2218 vcpu->arch.intr_msr |= MSR_LE; 2219 else 2220 vcpu->arch.intr_msr &= ~MSR_LE; 2221 } 2222 } 2223 2224 vc->lpcr = new_lpcr; 2225 kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_LPCR); 2226 2227 spin_unlock(&vc->lock); 2228} 2229 2230static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 2231 union kvmppc_one_reg *val) 2232{ 2233 int r = 0; 2234 long int i; 2235 2236 switch (id) { 2237 case KVM_REG_PPC_DEBUG_INST: 2238 *val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT); 2239 break; 2240 case KVM_REG_PPC_HIOR: 2241 *val = get_reg_val(id, 0); 2242 break; 2243 case KVM_REG_PPC_DABR: 2244 *val = get_reg_val(id, vcpu->arch.dabr); 2245 break; 2246 case KVM_REG_PPC_DABRX: 2247 *val = get_reg_val(id, vcpu->arch.dabrx); 2248 break; 2249 case KVM_REG_PPC_DSCR: 2250 *val = get_reg_val(id, kvmppc_get_dscr_hv(vcpu)); 2251 break; 2252 case KVM_REG_PPC_PURR: 2253 *val = get_reg_val(id, kvmppc_get_purr_hv(vcpu)); 2254 break; 2255 case KVM_REG_PPC_SPURR: 2256 *val = get_reg_val(id, kvmppc_get_spurr_hv(vcpu)); 2257 break; 2258 case KVM_REG_PPC_AMR: 2259 *val = get_reg_val(id, kvmppc_get_amr_hv(vcpu)); 2260 break; 2261 case KVM_REG_PPC_UAMOR: 2262 *val = get_reg_val(id, kvmppc_get_uamor_hv(vcpu)); 2263 break; 2264 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: 2265 i = id - KVM_REG_PPC_MMCR0; 2266 *val = get_reg_val(id, kvmppc_get_mmcr_hv(vcpu, i)); 2267 break; 2268 case KVM_REG_PPC_MMCR2: 2269 *val = get_reg_val(id, kvmppc_get_mmcr_hv(vcpu, 2)); 2270 break; 2271 case KVM_REG_PPC_MMCRA: 2272 *val = get_reg_val(id, kvmppc_get_mmcra_hv(vcpu)); 2273 break; 2274 case KVM_REG_PPC_MMCRS: 2275 *val = get_reg_val(id, vcpu->arch.mmcrs); 2276 break; 2277 case KVM_REG_PPC_MMCR3: 2278 *val = get_reg_val(id, kvmppc_get_mmcr_hv(vcpu, 3)); 2279 break; 2280 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 2281 i = id - KVM_REG_PPC_PMC1; 2282 *val = get_reg_val(id, kvmppc_get_pmc_hv(vcpu, i)); 2283 break; 2284 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 2285 i = id - KVM_REG_PPC_SPMC1; 2286 *val = get_reg_val(id, vcpu->arch.spmc[i]); 2287 break; 2288 case KVM_REG_PPC_SIAR: 2289 *val = get_reg_val(id, kvmppc_get_siar_hv(vcpu)); 2290 break; 2291 case KVM_REG_PPC_SDAR: 2292 *val = get_reg_val(id, kvmppc_get_sdar_hv(vcpu)); 2293 break; 2294 case KVM_REG_PPC_SIER: 2295 *val = get_reg_val(id, kvmppc_get_sier_hv(vcpu, 0)); 2296 break; 2297 case KVM_REG_PPC_SIER2: 2298 *val = get_reg_val(id, kvmppc_get_sier_hv(vcpu, 1)); 2299 break; 2300 case KVM_REG_PPC_SIER3: 2301 *val = get_reg_val(id, kvmppc_get_sier_hv(vcpu, 2)); 2302 break; 2303 case KVM_REG_PPC_IAMR: 2304 *val = get_reg_val(id, kvmppc_get_iamr_hv(vcpu)); 2305 break; 2306 case KVM_REG_PPC_PSPB: 2307 *val = get_reg_val(id, kvmppc_get_pspb_hv(vcpu)); 2308 break; 2309 case KVM_REG_PPC_DPDES: 2310 /* 2311 * On POWER9, where we are emulating msgsndp etc., 2312 * we return 1 bit for each vcpu, which can come from 2313 * either vcore->dpdes or doorbell_request. 2314 * On POWER8, doorbell_request is 0. 2315 */ 2316 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2317 *val = get_reg_val(id, vcpu->arch.doorbell_request); 2318 else 2319 *val = get_reg_val(id, vcpu->arch.vcore->dpdes); 2320 break; 2321 case KVM_REG_PPC_VTB: 2322 *val = get_reg_val(id, kvmppc_get_vtb(vcpu)); 2323 break; 2324 case KVM_REG_PPC_DAWR: 2325 *val = get_reg_val(id, kvmppc_get_dawr0_hv(vcpu)); 2326 break; 2327 case KVM_REG_PPC_DAWRX: 2328 *val = get_reg_val(id, kvmppc_get_dawrx0_hv(vcpu)); 2329 break; 2330 case KVM_REG_PPC_DAWR1: 2331 *val = get_reg_val(id, kvmppc_get_dawr1_hv(vcpu)); 2332 break; 2333 case KVM_REG_PPC_DAWRX1: 2334 *val = get_reg_val(id, kvmppc_get_dawrx1_hv(vcpu)); 2335 break; 2336 case KVM_REG_PPC_DEXCR: 2337 *val = get_reg_val(id, kvmppc_get_dexcr_hv(vcpu)); 2338 break; 2339 case KVM_REG_PPC_HASHKEYR: 2340 *val = get_reg_val(id, kvmppc_get_hashkeyr_hv(vcpu)); 2341 break; 2342 case KVM_REG_PPC_HASHPKEYR: 2343 *val = get_reg_val(id, kvmppc_get_hashpkeyr_hv(vcpu)); 2344 break; 2345 case KVM_REG_PPC_CIABR: 2346 *val = get_reg_val(id, kvmppc_get_ciabr_hv(vcpu)); 2347 break; 2348 case KVM_REG_PPC_CSIGR: 2349 *val = get_reg_val(id, vcpu->arch.csigr); 2350 break; 2351 case KVM_REG_PPC_TACR: 2352 *val = get_reg_val(id, vcpu->arch.tacr); 2353 break; 2354 case KVM_REG_PPC_TCSCR: 2355 *val = get_reg_val(id, vcpu->arch.tcscr); 2356 break; 2357 case KVM_REG_PPC_PID: 2358 *val = get_reg_val(id, kvmppc_get_pid(vcpu)); 2359 break; 2360 case KVM_REG_PPC_ACOP: 2361 *val = get_reg_val(id, vcpu->arch.acop); 2362 break; 2363 case KVM_REG_PPC_WORT: 2364 *val = get_reg_val(id, kvmppc_get_wort_hv(vcpu)); 2365 break; 2366 case KVM_REG_PPC_TIDR: 2367 *val = get_reg_val(id, vcpu->arch.tid); 2368 break; 2369 case KVM_REG_PPC_PSSCR: 2370 *val = get_reg_val(id, vcpu->arch.psscr); 2371 break; 2372 case KVM_REG_PPC_VPA_ADDR: 2373 spin_lock(&vcpu->arch.vpa_update_lock); 2374 *val = get_reg_val(id, vcpu->arch.vpa.next_gpa); 2375 spin_unlock(&vcpu->arch.vpa_update_lock); 2376 break; 2377 case KVM_REG_PPC_VPA_SLB: 2378 spin_lock(&vcpu->arch.vpa_update_lock); 2379 val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa; 2380 val->vpaval.length = vcpu->arch.slb_shadow.len; 2381 spin_unlock(&vcpu->arch.vpa_update_lock); 2382 break; 2383 case KVM_REG_PPC_VPA_DTL: 2384 spin_lock(&vcpu->arch.vpa_update_lock); 2385 val->vpaval.addr = vcpu->arch.dtl.next_gpa; 2386 val->vpaval.length = vcpu->arch.dtl.len; 2387 spin_unlock(&vcpu->arch.vpa_update_lock); 2388 break; 2389 case KVM_REG_PPC_TB_OFFSET: 2390 *val = get_reg_val(id, kvmppc_get_tb_offset(vcpu)); 2391 break; 2392 case KVM_REG_PPC_LPCR: 2393 case KVM_REG_PPC_LPCR_64: 2394 *val = get_reg_val(id, kvmppc_get_lpcr(vcpu)); 2395 break; 2396 case KVM_REG_PPC_PPR: 2397 *val = get_reg_val(id, kvmppc_get_ppr_hv(vcpu)); 2398 break; 2399#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2400 case KVM_REG_PPC_TFHAR: 2401 *val = get_reg_val(id, vcpu->arch.tfhar); 2402 break; 2403 case KVM_REG_PPC_TFIAR: 2404 *val = get_reg_val(id, vcpu->arch.tfiar); 2405 break; 2406 case KVM_REG_PPC_TEXASR: 2407 *val = get_reg_val(id, vcpu->arch.texasr); 2408 break; 2409 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 2410 i = id - KVM_REG_PPC_TM_GPR0; 2411 *val = get_reg_val(id, vcpu->arch.gpr_tm[i]); 2412 break; 2413 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 2414 { 2415 int j; 2416 i = id - KVM_REG_PPC_TM_VSR0; 2417 if (i < 32) 2418 for (j = 0; j < TS_FPRWIDTH; j++) 2419 val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j]; 2420 else { 2421 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2422 val->vval = vcpu->arch.vr_tm.vr[i-32]; 2423 else 2424 r = -ENXIO; 2425 } 2426 break; 2427 } 2428 case KVM_REG_PPC_TM_CR: 2429 *val = get_reg_val(id, vcpu->arch.cr_tm); 2430 break; 2431 case KVM_REG_PPC_TM_XER: 2432 *val = get_reg_val(id, vcpu->arch.xer_tm); 2433 break; 2434 case KVM_REG_PPC_TM_LR: 2435 *val = get_reg_val(id, vcpu->arch.lr_tm); 2436 break; 2437 case KVM_REG_PPC_TM_CTR: 2438 *val = get_reg_val(id, vcpu->arch.ctr_tm); 2439 break; 2440 case KVM_REG_PPC_TM_FPSCR: 2441 *val = get_reg_val(id, vcpu->arch.fp_tm.fpscr); 2442 break; 2443 case KVM_REG_PPC_TM_AMR: 2444 *val = get_reg_val(id, vcpu->arch.amr_tm); 2445 break; 2446 case KVM_REG_PPC_TM_PPR: 2447 *val = get_reg_val(id, vcpu->arch.ppr_tm); 2448 break; 2449 case KVM_REG_PPC_TM_VRSAVE: 2450 *val = get_reg_val(id, vcpu->arch.vrsave_tm); 2451 break; 2452 case KVM_REG_PPC_TM_VSCR: 2453 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2454 *val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]); 2455 else 2456 r = -ENXIO; 2457 break; 2458 case KVM_REG_PPC_TM_DSCR: 2459 *val = get_reg_val(id, vcpu->arch.dscr_tm); 2460 break; 2461 case KVM_REG_PPC_TM_TAR: 2462 *val = get_reg_val(id, vcpu->arch.tar_tm); 2463 break; 2464#endif 2465 case KVM_REG_PPC_ARCH_COMPAT: 2466 *val = get_reg_val(id, kvmppc_get_arch_compat(vcpu)); 2467 break; 2468 case KVM_REG_PPC_DEC_EXPIRY: 2469 *val = get_reg_val(id, kvmppc_get_dec_expires(vcpu)); 2470 break; 2471 case KVM_REG_PPC_ONLINE: 2472 *val = get_reg_val(id, vcpu->arch.online); 2473 break; 2474 case KVM_REG_PPC_PTCR: 2475 *val = get_reg_val(id, vcpu->kvm->arch.l1_ptcr); 2476 break; 2477 case KVM_REG_PPC_FSCR: 2478 *val = get_reg_val(id, kvmppc_get_fscr_hv(vcpu)); 2479 break; 2480 default: 2481 r = -EINVAL; 2482 break; 2483 } 2484 2485 return r; 2486} 2487 2488static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id, 2489 union kvmppc_one_reg *val) 2490{ 2491 int r = 0; 2492 long int i; 2493 unsigned long addr, len; 2494 2495 switch (id) { 2496 case KVM_REG_PPC_HIOR: 2497 /* Only allow this to be set to zero */ 2498 if (set_reg_val(id, *val)) 2499 r = -EINVAL; 2500 break; 2501 case KVM_REG_PPC_DABR: 2502 vcpu->arch.dabr = set_reg_val(id, *val); 2503 break; 2504 case KVM_REG_PPC_DABRX: 2505 vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP; 2506 break; 2507 case KVM_REG_PPC_DSCR: 2508 kvmppc_set_dscr_hv(vcpu, set_reg_val(id, *val)); 2509 break; 2510 case KVM_REG_PPC_PURR: 2511 kvmppc_set_purr_hv(vcpu, set_reg_val(id, *val)); 2512 break; 2513 case KVM_REG_PPC_SPURR: 2514 kvmppc_set_spurr_hv(vcpu, set_reg_val(id, *val)); 2515 break; 2516 case KVM_REG_PPC_AMR: 2517 kvmppc_set_amr_hv(vcpu, set_reg_val(id, *val)); 2518 break; 2519 case KVM_REG_PPC_UAMOR: 2520 kvmppc_set_uamor_hv(vcpu, set_reg_val(id, *val)); 2521 break; 2522 case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCR1: 2523 i = id - KVM_REG_PPC_MMCR0; 2524 kvmppc_set_mmcr_hv(vcpu, i, set_reg_val(id, *val)); 2525 break; 2526 case KVM_REG_PPC_MMCR2: 2527 kvmppc_set_mmcr_hv(vcpu, 2, set_reg_val(id, *val)); 2528 break; 2529 case KVM_REG_PPC_MMCRA: 2530 kvmppc_set_mmcra_hv(vcpu, set_reg_val(id, *val)); 2531 break; 2532 case KVM_REG_PPC_MMCRS: 2533 vcpu->arch.mmcrs = set_reg_val(id, *val); 2534 break; 2535 case KVM_REG_PPC_MMCR3: 2536 kvmppc_set_mmcr_hv(vcpu, 3, set_reg_val(id, *val)); 2537 break; 2538 case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8: 2539 i = id - KVM_REG_PPC_PMC1; 2540 kvmppc_set_pmc_hv(vcpu, i, set_reg_val(id, *val)); 2541 break; 2542 case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2: 2543 i = id - KVM_REG_PPC_SPMC1; 2544 vcpu->arch.spmc[i] = set_reg_val(id, *val); 2545 break; 2546 case KVM_REG_PPC_SIAR: 2547 kvmppc_set_siar_hv(vcpu, set_reg_val(id, *val)); 2548 break; 2549 case KVM_REG_PPC_SDAR: 2550 kvmppc_set_sdar_hv(vcpu, set_reg_val(id, *val)); 2551 break; 2552 case KVM_REG_PPC_SIER: 2553 kvmppc_set_sier_hv(vcpu, 0, set_reg_val(id, *val)); 2554 break; 2555 case KVM_REG_PPC_SIER2: 2556 kvmppc_set_sier_hv(vcpu, 1, set_reg_val(id, *val)); 2557 break; 2558 case KVM_REG_PPC_SIER3: 2559 kvmppc_set_sier_hv(vcpu, 2, set_reg_val(id, *val)); 2560 break; 2561 case KVM_REG_PPC_IAMR: 2562 kvmppc_set_iamr_hv(vcpu, set_reg_val(id, *val)); 2563 break; 2564 case KVM_REG_PPC_PSPB: 2565 kvmppc_set_pspb_hv(vcpu, set_reg_val(id, *val)); 2566 break; 2567 case KVM_REG_PPC_DPDES: 2568 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2569 vcpu->arch.doorbell_request = set_reg_val(id, *val) & 1; 2570 else 2571 vcpu->arch.vcore->dpdes = set_reg_val(id, *val); 2572 break; 2573 case KVM_REG_PPC_VTB: 2574 kvmppc_set_vtb(vcpu, set_reg_val(id, *val)); 2575 break; 2576 case KVM_REG_PPC_DAWR: 2577 kvmppc_set_dawr0_hv(vcpu, set_reg_val(id, *val)); 2578 break; 2579 case KVM_REG_PPC_DAWRX: 2580 kvmppc_set_dawrx0_hv(vcpu, set_reg_val(id, *val) & ~DAWRX_HYP); 2581 break; 2582 case KVM_REG_PPC_DAWR1: 2583 kvmppc_set_dawr1_hv(vcpu, set_reg_val(id, *val)); 2584 break; 2585 case KVM_REG_PPC_DAWRX1: 2586 kvmppc_set_dawrx1_hv(vcpu, set_reg_val(id, *val) & ~DAWRX_HYP); 2587 break; 2588 case KVM_REG_PPC_DEXCR: 2589 kvmppc_set_dexcr_hv(vcpu, set_reg_val(id, *val)); 2590 break; 2591 case KVM_REG_PPC_HASHKEYR: 2592 kvmppc_set_hashkeyr_hv(vcpu, set_reg_val(id, *val)); 2593 break; 2594 case KVM_REG_PPC_HASHPKEYR: 2595 kvmppc_set_hashpkeyr_hv(vcpu, set_reg_val(id, *val)); 2596 break; 2597 case KVM_REG_PPC_CIABR: 2598 kvmppc_set_ciabr_hv(vcpu, set_reg_val(id, *val)); 2599 /* Don't allow setting breakpoints in hypervisor code */ 2600 if ((kvmppc_get_ciabr_hv(vcpu) & CIABR_PRIV) == CIABR_PRIV_HYPER) 2601 kvmppc_set_ciabr_hv(vcpu, kvmppc_get_ciabr_hv(vcpu) & ~CIABR_PRIV); 2602 break; 2603 case KVM_REG_PPC_CSIGR: 2604 vcpu->arch.csigr = set_reg_val(id, *val); 2605 break; 2606 case KVM_REG_PPC_TACR: 2607 vcpu->arch.tacr = set_reg_val(id, *val); 2608 break; 2609 case KVM_REG_PPC_TCSCR: 2610 vcpu->arch.tcscr = set_reg_val(id, *val); 2611 break; 2612 case KVM_REG_PPC_PID: 2613 kvmppc_set_pid(vcpu, set_reg_val(id, *val)); 2614 break; 2615 case KVM_REG_PPC_ACOP: 2616 vcpu->arch.acop = set_reg_val(id, *val); 2617 break; 2618 case KVM_REG_PPC_WORT: 2619 kvmppc_set_wort_hv(vcpu, set_reg_val(id, *val)); 2620 break; 2621 case KVM_REG_PPC_TIDR: 2622 vcpu->arch.tid = set_reg_val(id, *val); 2623 break; 2624 case KVM_REG_PPC_PSSCR: 2625 vcpu->arch.psscr = set_reg_val(id, *val) & PSSCR_GUEST_VIS; 2626 break; 2627 case KVM_REG_PPC_VPA_ADDR: 2628 addr = set_reg_val(id, *val); 2629 r = -EINVAL; 2630 if (!addr && (vcpu->arch.slb_shadow.next_gpa || 2631 vcpu->arch.dtl.next_gpa)) 2632 break; 2633 r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca)); 2634 break; 2635 case KVM_REG_PPC_VPA_SLB: 2636 addr = val->vpaval.addr; 2637 len = val->vpaval.length; 2638 r = -EINVAL; 2639 if (addr && !vcpu->arch.vpa.next_gpa) 2640 break; 2641 r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len); 2642 break; 2643 case KVM_REG_PPC_VPA_DTL: 2644 addr = val->vpaval.addr; 2645 len = val->vpaval.length; 2646 r = -EINVAL; 2647 if (addr && (len < sizeof(struct dtl_entry) || 2648 !vcpu->arch.vpa.next_gpa)) 2649 break; 2650 len -= len % sizeof(struct dtl_entry); 2651 r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len); 2652 break; 2653 case KVM_REG_PPC_TB_OFFSET: 2654 { 2655 /* round up to multiple of 2^24 */ 2656 u64 tb_offset = ALIGN(set_reg_val(id, *val), 1UL << 24); 2657 2658 /* 2659 * Now that we know the timebase offset, update the 2660 * decrementer expiry with a guest timebase value. If 2661 * the userspace does not set DEC_EXPIRY, this ensures 2662 * a migrated vcpu at least starts with an expired 2663 * decrementer, which is better than a large one that 2664 * causes a hang. 2665 */ 2666 kvmppc_set_tb_offset(vcpu, tb_offset); 2667 if (!kvmppc_get_dec_expires(vcpu) && tb_offset) 2668 kvmppc_set_dec_expires(vcpu, get_tb() + tb_offset); 2669 2670 kvmppc_set_tb_offset(vcpu, tb_offset); 2671 break; 2672 } 2673 case KVM_REG_PPC_LPCR: 2674 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true); 2675 break; 2676 case KVM_REG_PPC_LPCR_64: 2677 kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false); 2678 break; 2679 case KVM_REG_PPC_PPR: 2680 kvmppc_set_ppr_hv(vcpu, set_reg_val(id, *val)); 2681 break; 2682#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 2683 case KVM_REG_PPC_TFHAR: 2684 vcpu->arch.tfhar = set_reg_val(id, *val); 2685 break; 2686 case KVM_REG_PPC_TFIAR: 2687 vcpu->arch.tfiar = set_reg_val(id, *val); 2688 break; 2689 case KVM_REG_PPC_TEXASR: 2690 vcpu->arch.texasr = set_reg_val(id, *val); 2691 break; 2692 case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31: 2693 i = id - KVM_REG_PPC_TM_GPR0; 2694 vcpu->arch.gpr_tm[i] = set_reg_val(id, *val); 2695 break; 2696 case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63: 2697 { 2698 int j; 2699 i = id - KVM_REG_PPC_TM_VSR0; 2700 if (i < 32) 2701 for (j = 0; j < TS_FPRWIDTH; j++) 2702 vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j]; 2703 else 2704 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2705 vcpu->arch.vr_tm.vr[i-32] = val->vval; 2706 else 2707 r = -ENXIO; 2708 break; 2709 } 2710 case KVM_REG_PPC_TM_CR: 2711 vcpu->arch.cr_tm = set_reg_val(id, *val); 2712 break; 2713 case KVM_REG_PPC_TM_XER: 2714 vcpu->arch.xer_tm = set_reg_val(id, *val); 2715 break; 2716 case KVM_REG_PPC_TM_LR: 2717 vcpu->arch.lr_tm = set_reg_val(id, *val); 2718 break; 2719 case KVM_REG_PPC_TM_CTR: 2720 vcpu->arch.ctr_tm = set_reg_val(id, *val); 2721 break; 2722 case KVM_REG_PPC_TM_FPSCR: 2723 vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val); 2724 break; 2725 case KVM_REG_PPC_TM_AMR: 2726 vcpu->arch.amr_tm = set_reg_val(id, *val); 2727 break; 2728 case KVM_REG_PPC_TM_PPR: 2729 vcpu->arch.ppr_tm = set_reg_val(id, *val); 2730 break; 2731 case KVM_REG_PPC_TM_VRSAVE: 2732 vcpu->arch.vrsave_tm = set_reg_val(id, *val); 2733 break; 2734 case KVM_REG_PPC_TM_VSCR: 2735 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 2736 vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val); 2737 else 2738 r = - ENXIO; 2739 break; 2740 case KVM_REG_PPC_TM_DSCR: 2741 vcpu->arch.dscr_tm = set_reg_val(id, *val); 2742 break; 2743 case KVM_REG_PPC_TM_TAR: 2744 vcpu->arch.tar_tm = set_reg_val(id, *val); 2745 break; 2746#endif 2747 case KVM_REG_PPC_ARCH_COMPAT: 2748 r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val)); 2749 break; 2750 case KVM_REG_PPC_DEC_EXPIRY: 2751 kvmppc_set_dec_expires(vcpu, set_reg_val(id, *val)); 2752 break; 2753 case KVM_REG_PPC_ONLINE: 2754 i = set_reg_val(id, *val); 2755 if (i && !vcpu->arch.online) 2756 atomic_inc(&vcpu->arch.vcore->online_count); 2757 else if (!i && vcpu->arch.online) 2758 atomic_dec(&vcpu->arch.vcore->online_count); 2759 vcpu->arch.online = i; 2760 break; 2761 case KVM_REG_PPC_PTCR: 2762 vcpu->kvm->arch.l1_ptcr = set_reg_val(id, *val); 2763 break; 2764 case KVM_REG_PPC_FSCR: 2765 kvmppc_set_fscr_hv(vcpu, set_reg_val(id, *val)); 2766 break; 2767 default: 2768 r = -EINVAL; 2769 break; 2770 } 2771 2772 return r; 2773} 2774 2775/* 2776 * On POWER9, threads are independent and can be in different partitions. 2777 * Therefore we consider each thread to be a subcore. 2778 * There is a restriction that all threads have to be in the same 2779 * MMU mode (radix or HPT), unfortunately, but since we only support 2780 * HPT guests on a HPT host so far, that isn't an impediment yet. 2781 */ 2782static int threads_per_vcore(struct kvm *kvm) 2783{ 2784 if (cpu_has_feature(CPU_FTR_ARCH_300)) 2785 return 1; 2786 return threads_per_subcore; 2787} 2788 2789static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int id) 2790{ 2791 struct kvmppc_vcore *vcore; 2792 2793 vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL); 2794 2795 if (vcore == NULL) 2796 return NULL; 2797 2798 spin_lock_init(&vcore->lock); 2799 spin_lock_init(&vcore->stoltb_lock); 2800 rcuwait_init(&vcore->wait); 2801 vcore->preempt_tb = TB_NIL; 2802 vcore->lpcr = kvm->arch.lpcr; 2803 vcore->first_vcpuid = id; 2804 vcore->kvm = kvm; 2805 INIT_LIST_HEAD(&vcore->preempt_list); 2806 2807 return vcore; 2808} 2809 2810#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING 2811static struct debugfs_timings_element { 2812 const char *name; 2813 size_t offset; 2814} timings[] = { 2815#ifdef CONFIG_KVM_BOOK3S_HV_P9_TIMING 2816 {"vcpu_entry", offsetof(struct kvm_vcpu, arch.vcpu_entry)}, 2817 {"guest_entry", offsetof(struct kvm_vcpu, arch.guest_entry)}, 2818 {"in_guest", offsetof(struct kvm_vcpu, arch.in_guest)}, 2819 {"guest_exit", offsetof(struct kvm_vcpu, arch.guest_exit)}, 2820 {"vcpu_exit", offsetof(struct kvm_vcpu, arch.vcpu_exit)}, 2821 {"hypercall", offsetof(struct kvm_vcpu, arch.hcall)}, 2822 {"page_fault", offsetof(struct kvm_vcpu, arch.pg_fault)}, 2823#else 2824 {"rm_entry", offsetof(struct kvm_vcpu, arch.rm_entry)}, 2825 {"rm_intr", offsetof(struct kvm_vcpu, arch.rm_intr)}, 2826 {"rm_exit", offsetof(struct kvm_vcpu, arch.rm_exit)}, 2827 {"guest", offsetof(struct kvm_vcpu, arch.guest_time)}, 2828 {"cede", offsetof(struct kvm_vcpu, arch.cede_time)}, 2829#endif 2830}; 2831 2832#define N_TIMINGS (ARRAY_SIZE(timings)) 2833 2834struct debugfs_timings_state { 2835 struct kvm_vcpu *vcpu; 2836 unsigned int buflen; 2837 char buf[N_TIMINGS * 100]; 2838}; 2839 2840static int debugfs_timings_open(struct inode *inode, struct file *file) 2841{ 2842 struct kvm_vcpu *vcpu = inode->i_private; 2843 struct debugfs_timings_state *p; 2844 2845 p = kzalloc(sizeof(*p), GFP_KERNEL); 2846 if (!p) 2847 return -ENOMEM; 2848 2849 kvm_get_kvm(vcpu->kvm); 2850 p->vcpu = vcpu; 2851 file->private_data = p; 2852 2853 return nonseekable_open(inode, file); 2854} 2855 2856static int debugfs_timings_release(struct inode *inode, struct file *file) 2857{ 2858 struct debugfs_timings_state *p = file->private_data; 2859 2860 kvm_put_kvm(p->vcpu->kvm); 2861 kfree(p); 2862 return 0; 2863} 2864 2865static ssize_t debugfs_timings_read(struct file *file, char __user *buf, 2866 size_t len, loff_t *ppos) 2867{ 2868 struct debugfs_timings_state *p = file->private_data; 2869 struct kvm_vcpu *vcpu = p->vcpu; 2870 char *s, *buf_end; 2871 struct kvmhv_tb_accumulator tb; 2872 u64 count; 2873 loff_t pos; 2874 ssize_t n; 2875 int i, loops; 2876 bool ok; 2877 2878 if (!p->buflen) { 2879 s = p->buf; 2880 buf_end = s + sizeof(p->buf); 2881 for (i = 0; i < N_TIMINGS; ++i) { 2882 struct kvmhv_tb_accumulator *acc; 2883 2884 acc = (struct kvmhv_tb_accumulator *) 2885 ((unsigned long)vcpu + timings[i].offset); 2886 ok = false; 2887 for (loops = 0; loops < 1000; ++loops) { 2888 count = acc->seqcount; 2889 if (!(count & 1)) { 2890 smp_rmb(); 2891 tb = *acc; 2892 smp_rmb(); 2893 if (count == acc->seqcount) { 2894 ok = true; 2895 break; 2896 } 2897 } 2898 udelay(1); 2899 } 2900 if (!ok) 2901 snprintf(s, buf_end - s, "%s: stuck\n", 2902 timings[i].name); 2903 else 2904 snprintf(s, buf_end - s, 2905 "%s: %llu %llu %llu %llu\n", 2906 timings[i].name, count / 2, 2907 tb_to_ns(tb.tb_total), 2908 tb_to_ns(tb.tb_min), 2909 tb_to_ns(tb.tb_max)); 2910 s += strlen(s); 2911 } 2912 p->buflen = s - p->buf; 2913 } 2914 2915 pos = *ppos; 2916 if (pos >= p->buflen) 2917 return 0; 2918 if (len > p->buflen - pos) 2919 len = p->buflen - pos; 2920 n = copy_to_user(buf, p->buf + pos, len); 2921 if (n) { 2922 if (n == len) 2923 return -EFAULT; 2924 len -= n; 2925 } 2926 *ppos = pos + len; 2927 return len; 2928} 2929 2930static ssize_t debugfs_timings_write(struct file *file, const char __user *buf, 2931 size_t len, loff_t *ppos) 2932{ 2933 return -EACCES; 2934} 2935 2936static const struct file_operations debugfs_timings_ops = { 2937 .owner = THIS_MODULE, 2938 .open = debugfs_timings_open, 2939 .release = debugfs_timings_release, 2940 .read = debugfs_timings_read, 2941 .write = debugfs_timings_write, 2942 .llseek = generic_file_llseek, 2943}; 2944 2945/* Create a debugfs directory for the vcpu */ 2946static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) 2947{ 2948 if (cpu_has_feature(CPU_FTR_ARCH_300) == IS_ENABLED(CONFIG_KVM_BOOK3S_HV_P9_TIMING)) 2949 debugfs_create_file("timings", 0444, debugfs_dentry, vcpu, 2950 &debugfs_timings_ops); 2951 return 0; 2952} 2953 2954#else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 2955static int kvmppc_arch_create_vcpu_debugfs_hv(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry) 2956{ 2957 return 0; 2958} 2959#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */ 2960 2961static int kvmppc_core_vcpu_create_hv(struct kvm_vcpu *vcpu) 2962{ 2963 int err; 2964 int core; 2965 struct kvmppc_vcore *vcore; 2966 struct kvm *kvm; 2967 unsigned int id; 2968 2969 kvm = vcpu->kvm; 2970 id = vcpu->vcpu_id; 2971 2972 vcpu->arch.shared = &vcpu->arch.shregs; 2973#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE 2974 /* 2975 * The shared struct is never shared on HV, 2976 * so we can always use host endianness 2977 */ 2978#ifdef __BIG_ENDIAN__ 2979 vcpu->arch.shared_big_endian = true; 2980#else 2981 vcpu->arch.shared_big_endian = false; 2982#endif 2983#endif 2984 2985 if (kvmhv_is_nestedv2()) { 2986 err = kvmhv_nestedv2_vcpu_create(vcpu, &vcpu->arch.nestedv2_io); 2987 if (err < 0) 2988 return err; 2989 } 2990 2991 kvmppc_set_mmcr_hv(vcpu, 0, MMCR0_FC); 2992 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 2993 kvmppc_set_mmcr_hv(vcpu, 0, kvmppc_get_mmcr_hv(vcpu, 0) | MMCR0_PMCCEXT); 2994 kvmppc_set_mmcra_hv(vcpu, MMCRA_BHRB_DISABLE); 2995 } 2996 2997 kvmppc_set_ctrl_hv(vcpu, CTRL_RUNLATCH); 2998 /* default to host PVR, since we can't spoof it */ 2999 kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR)); 3000 spin_lock_init(&vcpu->arch.vpa_update_lock); 3001 spin_lock_init(&vcpu->arch.tbacct_lock); 3002 vcpu->arch.busy_preempt = TB_NIL; 3003 __kvmppc_set_msr_hv(vcpu, MSR_ME); 3004 vcpu->arch.intr_msr = MSR_SF | MSR_ME; 3005 3006 /* 3007 * Set the default HFSCR for the guest from the host value. 3008 * This value is only used on POWER9 and later. 3009 * On >= POWER9, we want to virtualize the doorbell facility, so we 3010 * don't set the HFSCR_MSGP bit, and that causes those instructions 3011 * to trap and then we emulate them. 3012 */ 3013 kvmppc_set_hfscr_hv(vcpu, HFSCR_TAR | HFSCR_EBB | HFSCR_PM | HFSCR_BHRB | 3014 HFSCR_DSCR | HFSCR_VECVSX | HFSCR_FP); 3015 3016 /* On POWER10 and later, allow prefixed instructions */ 3017 if (cpu_has_feature(CPU_FTR_ARCH_31)) 3018 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_PREFIX); 3019 3020 if (cpu_has_feature(CPU_FTR_HVMODE)) { 3021 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) & mfspr(SPRN_HFSCR)); 3022 3023#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 3024 if (cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) 3025 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) | HFSCR_TM); 3026#endif 3027 } 3028 if (cpu_has_feature(CPU_FTR_TM_COMP)) 3029 vcpu->arch.hfscr |= HFSCR_TM; 3030 3031 vcpu->arch.hfscr_permitted = kvmppc_get_hfscr_hv(vcpu); 3032 3033 /* 3034 * PM, EBB, TM are demand-faulted so start with it clear. 3035 */ 3036 kvmppc_set_hfscr_hv(vcpu, kvmppc_get_hfscr_hv(vcpu) & ~(HFSCR_PM | HFSCR_EBB | HFSCR_TM)); 3037 3038 kvmppc_mmu_book3s_hv_init(vcpu); 3039 3040 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 3041 3042 init_waitqueue_head(&vcpu->arch.cpu_run); 3043 3044 mutex_lock(&kvm->lock); 3045 vcore = NULL; 3046 err = -EINVAL; 3047 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 3048 if (id >= (KVM_MAX_VCPUS * kvm->arch.emul_smt_mode)) { 3049 pr_devel("KVM: VCPU ID too high\n"); 3050 core = KVM_MAX_VCORES; 3051 } else { 3052 BUG_ON(kvm->arch.smt_mode != 1); 3053 core = kvmppc_pack_vcpu_id(kvm, id); 3054 } 3055 } else { 3056 core = id / kvm->arch.smt_mode; 3057 } 3058 if (core < KVM_MAX_VCORES) { 3059 vcore = kvm->arch.vcores[core]; 3060 if (vcore && cpu_has_feature(CPU_FTR_ARCH_300)) { 3061 pr_devel("KVM: collision on id %u", id); 3062 vcore = NULL; 3063 } else if (!vcore) { 3064 /* 3065 * Take mmu_setup_lock for mutual exclusion 3066 * with kvmppc_update_lpcr(). 3067 */ 3068 err = -ENOMEM; 3069 vcore = kvmppc_vcore_create(kvm, 3070 id & ~(kvm->arch.smt_mode - 1)); 3071 mutex_lock(&kvm->arch.mmu_setup_lock); 3072 kvm->arch.vcores[core] = vcore; 3073 kvm->arch.online_vcores++; 3074 mutex_unlock(&kvm->arch.mmu_setup_lock); 3075 } 3076 } 3077 mutex_unlock(&kvm->lock); 3078 3079 if (!vcore) 3080 return err; 3081 3082 spin_lock(&vcore->lock); 3083 ++vcore->num_threads; 3084 spin_unlock(&vcore->lock); 3085 vcpu->arch.vcore = vcore; 3086 vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid; 3087 vcpu->arch.thread_cpu = -1; 3088 vcpu->arch.prev_cpu = -1; 3089 3090 vcpu->arch.cpu_type = KVM_CPU_3S_64; 3091 kvmppc_sanity_check(vcpu); 3092 3093 return 0; 3094} 3095 3096static int kvmhv_set_smt_mode(struct kvm *kvm, unsigned long smt_mode, 3097 unsigned long flags) 3098{ 3099 int err; 3100 int esmt = 0; 3101 3102 if (flags) 3103 return -EINVAL; 3104 if (smt_mode > MAX_SMT_THREADS || !is_power_of_2(smt_mode)) 3105 return -EINVAL; 3106 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 3107 /* 3108 * On POWER8 (or POWER7), the threading mode is "strict", 3109 * so we pack smt_mode vcpus per vcore. 3110 */ 3111 if (smt_mode > threads_per_subcore) 3112 return -EINVAL; 3113 } else { 3114 /* 3115 * On POWER9, the threading mode is "loose", 3116 * so each vcpu gets its own vcore. 3117 */ 3118 esmt = smt_mode; 3119 smt_mode = 1; 3120 } 3121 mutex_lock(&kvm->lock); 3122 err = -EBUSY; 3123 if (!kvm->arch.online_vcores) { 3124 kvm->arch.smt_mode = smt_mode; 3125 kvm->arch.emul_smt_mode = esmt; 3126 err = 0; 3127 } 3128 mutex_unlock(&kvm->lock); 3129 3130 return err; 3131} 3132 3133static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa) 3134{ 3135 if (vpa->pinned_addr) 3136 kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa, 3137 vpa->dirty); 3138} 3139 3140static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu) 3141{ 3142 spin_lock(&vcpu->arch.vpa_update_lock); 3143 unpin_vpa(vcpu->kvm, &vcpu->arch.dtl); 3144 unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow); 3145 unpin_vpa(vcpu->kvm, &vcpu->arch.vpa); 3146 spin_unlock(&vcpu->arch.vpa_update_lock); 3147 if (kvmhv_is_nestedv2()) 3148 kvmhv_nestedv2_vcpu_free(vcpu, &vcpu->arch.nestedv2_io); 3149} 3150 3151static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu) 3152{ 3153 /* Indicate we want to get back into the guest */ 3154 return 1; 3155} 3156 3157static void kvmppc_set_timer(struct kvm_vcpu *vcpu) 3158{ 3159 unsigned long dec_nsec, now; 3160 3161 now = get_tb(); 3162 if (now > kvmppc_dec_expires_host_tb(vcpu)) { 3163 /* decrementer has already gone negative */ 3164 kvmppc_core_queue_dec(vcpu); 3165 kvmppc_core_prepare_to_enter(vcpu); 3166 return; 3167 } 3168 dec_nsec = tb_to_ns(kvmppc_dec_expires_host_tb(vcpu) - now); 3169 hrtimer_start(&vcpu->arch.dec_timer, dec_nsec, HRTIMER_MODE_REL); 3170 vcpu->arch.timer_running = 1; 3171} 3172 3173extern int __kvmppc_vcore_entry(void); 3174 3175static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, 3176 struct kvm_vcpu *vcpu, u64 tb) 3177{ 3178 u64 now; 3179 3180 if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 3181 return; 3182 spin_lock_irq(&vcpu->arch.tbacct_lock); 3183 now = tb; 3184 vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) - 3185 vcpu->arch.stolen_logged; 3186 vcpu->arch.busy_preempt = now; 3187 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 3188 spin_unlock_irq(&vcpu->arch.tbacct_lock); 3189 --vc->n_runnable; 3190 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], NULL); 3191} 3192 3193static int kvmppc_grab_hwthread(int cpu) 3194{ 3195 struct paca_struct *tpaca; 3196 long timeout = 10000; 3197 3198 tpaca = paca_ptrs[cpu]; 3199 3200 /* Ensure the thread won't go into the kernel if it wakes */ 3201 tpaca->kvm_hstate.kvm_vcpu = NULL; 3202 tpaca->kvm_hstate.kvm_vcore = NULL; 3203 tpaca->kvm_hstate.napping = 0; 3204 smp_wmb(); 3205 tpaca->kvm_hstate.hwthread_req = 1; 3206 3207 /* 3208 * If the thread is already executing in the kernel (e.g. handling 3209 * a stray interrupt), wait for it to get back to nap mode. 3210 * The smp_mb() is to ensure that our setting of hwthread_req 3211 * is visible before we look at hwthread_state, so if this 3212 * races with the code at system_reset_pSeries and the thread 3213 * misses our setting of hwthread_req, we are sure to see its 3214 * setting of hwthread_state, and vice versa. 3215 */ 3216 smp_mb(); 3217 while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) { 3218 if (--timeout <= 0) { 3219 pr_err("KVM: couldn't grab cpu %d\n", cpu); 3220 return -EBUSY; 3221 } 3222 udelay(1); 3223 } 3224 return 0; 3225} 3226 3227static void kvmppc_release_hwthread(int cpu) 3228{ 3229 struct paca_struct *tpaca; 3230 3231 tpaca = paca_ptrs[cpu]; 3232 tpaca->kvm_hstate.hwthread_req = 0; 3233 tpaca->kvm_hstate.kvm_vcpu = NULL; 3234 tpaca->kvm_hstate.kvm_vcore = NULL; 3235 tpaca->kvm_hstate.kvm_split_mode = NULL; 3236} 3237 3238static DEFINE_PER_CPU(struct kvm *, cpu_in_guest); 3239 3240static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu) 3241{ 3242 struct kvm_nested_guest *nested = vcpu->arch.nested; 3243 cpumask_t *need_tlb_flush; 3244 int i; 3245 3246 if (nested) 3247 need_tlb_flush = &nested->need_tlb_flush; 3248 else 3249 need_tlb_flush = &kvm->arch.need_tlb_flush; 3250 3251 cpu = cpu_first_tlb_thread_sibling(cpu); 3252 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); 3253 i += cpu_tlb_thread_sibling_step()) 3254 cpumask_set_cpu(i, need_tlb_flush); 3255 3256 /* 3257 * Make sure setting of bit in need_tlb_flush precedes testing of 3258 * cpu_in_guest. The matching barrier on the other side is hwsync 3259 * when switching to guest MMU mode, which happens between 3260 * cpu_in_guest being set to the guest kvm, and need_tlb_flush bit 3261 * being tested. 3262 */ 3263 smp_mb(); 3264 3265 for (i = cpu; i <= cpu_last_tlb_thread_sibling(cpu); 3266 i += cpu_tlb_thread_sibling_step()) { 3267 struct kvm *running = *per_cpu_ptr(&cpu_in_guest, i); 3268 3269 if (running == kvm) 3270 smp_call_function_single(i, do_nothing, NULL, 1); 3271 } 3272} 3273 3274static void do_migrate_away_vcpu(void *arg) 3275{ 3276 struct kvm_vcpu *vcpu = arg; 3277 struct kvm *kvm = vcpu->kvm; 3278 3279 /* 3280 * If the guest has GTSE, it may execute tlbie, so do a eieio; tlbsync; 3281 * ptesync sequence on the old CPU before migrating to a new one, in 3282 * case we interrupted the guest between a tlbie ; eieio ; 3283 * tlbsync; ptesync sequence. 3284 * 3285 * Otherwise, ptesync is sufficient for ordering tlbiel sequences. 3286 */ 3287 if (kvm->arch.lpcr & LPCR_GTSE) 3288 asm volatile("eieio; tlbsync; ptesync"); 3289 else 3290 asm volatile("ptesync"); 3291} 3292 3293static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu) 3294{ 3295 struct kvm_nested_guest *nested = vcpu->arch.nested; 3296 struct kvm *kvm = vcpu->kvm; 3297 int prev_cpu; 3298 3299 if (!cpu_has_feature(CPU_FTR_HVMODE)) 3300 return; 3301 3302 if (nested) 3303 prev_cpu = nested->prev_cpu[vcpu->arch.nested_vcpu_id]; 3304 else 3305 prev_cpu = vcpu->arch.prev_cpu; 3306 3307 /* 3308 * With radix, the guest can do TLB invalidations itself, 3309 * and it could choose to use the local form (tlbiel) if 3310 * it is invalidating a translation that has only ever been 3311 * used on one vcpu. However, that doesn't mean it has 3312 * only ever been used on one physical cpu, since vcpus 3313 * can move around between pcpus. To cope with this, when 3314 * a vcpu moves from one pcpu to another, we need to tell 3315 * any vcpus running on the same core as this vcpu previously 3316 * ran to flush the TLB. 3317 */ 3318 if (prev_cpu != pcpu) { 3319 if (prev_cpu >= 0) { 3320 if (cpu_first_tlb_thread_sibling(prev_cpu) != 3321 cpu_first_tlb_thread_sibling(pcpu)) 3322 radix_flush_cpu(kvm, prev_cpu, vcpu); 3323 3324 smp_call_function_single(prev_cpu, 3325 do_migrate_away_vcpu, vcpu, 1); 3326 } 3327 if (nested) 3328 nested->prev_cpu[vcpu->arch.nested_vcpu_id] = pcpu; 3329 else 3330 vcpu->arch.prev_cpu = pcpu; 3331 } 3332} 3333 3334static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc) 3335{ 3336 int cpu; 3337 struct paca_struct *tpaca; 3338 3339 cpu = vc->pcpu; 3340 if (vcpu) { 3341 if (vcpu->arch.timer_running) { 3342 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 3343 vcpu->arch.timer_running = 0; 3344 } 3345 cpu += vcpu->arch.ptid; 3346 vcpu->cpu = vc->pcpu; 3347 vcpu->arch.thread_cpu = cpu; 3348 } 3349 tpaca = paca_ptrs[cpu]; 3350 tpaca->kvm_hstate.kvm_vcpu = vcpu; 3351 tpaca->kvm_hstate.ptid = cpu - vc->pcpu; 3352 tpaca->kvm_hstate.fake_suspend = 0; 3353 /* Order stores to hstate.kvm_vcpu etc. before store to kvm_vcore */ 3354 smp_wmb(); 3355 tpaca->kvm_hstate.kvm_vcore = vc; 3356 if (cpu != smp_processor_id()) 3357 kvmppc_ipi_thread(cpu); 3358} 3359 3360static void kvmppc_wait_for_nap(int n_threads) 3361{ 3362 int cpu = smp_processor_id(); 3363 int i, loops; 3364 3365 if (n_threads <= 1) 3366 return; 3367 for (loops = 0; loops < 1000000; ++loops) { 3368 /* 3369 * Check if all threads are finished. 3370 * We set the vcore pointer when starting a thread 3371 * and the thread clears it when finished, so we look 3372 * for any threads that still have a non-NULL vcore ptr. 3373 */ 3374 for (i = 1; i < n_threads; ++i) 3375 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) 3376 break; 3377 if (i == n_threads) { 3378 HMT_medium(); 3379 return; 3380 } 3381 HMT_low(); 3382 } 3383 HMT_medium(); 3384 for (i = 1; i < n_threads; ++i) 3385 if (paca_ptrs[cpu + i]->kvm_hstate.kvm_vcore) 3386 pr_err("KVM: CPU %d seems to be stuck\n", cpu + i); 3387} 3388 3389/* 3390 * Check that we are on thread 0 and that any other threads in 3391 * this core are off-line. Then grab the threads so they can't 3392 * enter the kernel. 3393 */ 3394static int on_primary_thread(void) 3395{ 3396 int cpu = smp_processor_id(); 3397 int thr; 3398 3399 /* Are we on a primary subcore? */ 3400 if (cpu_thread_in_subcore(cpu)) 3401 return 0; 3402 3403 thr = 0; 3404 while (++thr < threads_per_subcore) 3405 if (cpu_online(cpu + thr)) 3406 return 0; 3407 3408 /* Grab all hw threads so they can't go into the kernel */ 3409 for (thr = 1; thr < threads_per_subcore; ++thr) { 3410 if (kvmppc_grab_hwthread(cpu + thr)) { 3411 /* Couldn't grab one; let the others go */ 3412 do { 3413 kvmppc_release_hwthread(cpu + thr); 3414 } while (--thr > 0); 3415 return 0; 3416 } 3417 } 3418 return 1; 3419} 3420 3421/* 3422 * A list of virtual cores for each physical CPU. 3423 * These are vcores that could run but their runner VCPU tasks are 3424 * (or may be) preempted. 3425 */ 3426struct preempted_vcore_list { 3427 struct list_head list; 3428 spinlock_t lock; 3429}; 3430 3431static DEFINE_PER_CPU(struct preempted_vcore_list, preempted_vcores); 3432 3433static void init_vcore_lists(void) 3434{ 3435 int cpu; 3436 3437 for_each_possible_cpu(cpu) { 3438 struct preempted_vcore_list *lp = &per_cpu(preempted_vcores, cpu); 3439 spin_lock_init(&lp->lock); 3440 INIT_LIST_HEAD(&lp->list); 3441 } 3442} 3443 3444static void kvmppc_vcore_preempt(struct kvmppc_vcore *vc) 3445{ 3446 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 3447 3448 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 3449 3450 vc->vcore_state = VCORE_PREEMPT; 3451 vc->pcpu = smp_processor_id(); 3452 if (vc->num_threads < threads_per_vcore(vc->kvm)) { 3453 spin_lock(&lp->lock); 3454 list_add_tail(&vc->preempt_list, &lp->list); 3455 spin_unlock(&lp->lock); 3456 } 3457 3458 /* Start accumulating stolen time */ 3459 kvmppc_core_start_stolen(vc, mftb()); 3460} 3461 3462static void kvmppc_vcore_end_preempt(struct kvmppc_vcore *vc) 3463{ 3464 struct preempted_vcore_list *lp; 3465 3466 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 3467 3468 kvmppc_core_end_stolen(vc, mftb()); 3469 if (!list_empty(&vc->preempt_list)) { 3470 lp = &per_cpu(preempted_vcores, vc->pcpu); 3471 spin_lock(&lp->lock); 3472 list_del_init(&vc->preempt_list); 3473 spin_unlock(&lp->lock); 3474 } 3475 vc->vcore_state = VCORE_INACTIVE; 3476} 3477 3478/* 3479 * This stores information about the virtual cores currently 3480 * assigned to a physical core. 3481 */ 3482struct core_info { 3483 int n_subcores; 3484 int max_subcore_threads; 3485 int total_threads; 3486 int subcore_threads[MAX_SUBCORES]; 3487 struct kvmppc_vcore *vc[MAX_SUBCORES]; 3488}; 3489 3490/* 3491 * This mapping means subcores 0 and 1 can use threads 0-3 and 4-7 3492 * respectively in 2-way micro-threading (split-core) mode on POWER8. 3493 */ 3494static int subcore_thread_map[MAX_SUBCORES] = { 0, 4, 2, 6 }; 3495 3496static void init_core_info(struct core_info *cip, struct kvmppc_vcore *vc) 3497{ 3498 memset(cip, 0, sizeof(*cip)); 3499 cip->n_subcores = 1; 3500 cip->max_subcore_threads = vc->num_threads; 3501 cip->total_threads = vc->num_threads; 3502 cip->subcore_threads[0] = vc->num_threads; 3503 cip->vc[0] = vc; 3504} 3505 3506static bool subcore_config_ok(int n_subcores, int n_threads) 3507{ 3508 /* 3509 * POWER9 "SMT4" cores are permanently in what is effectively a 4-way 3510 * split-core mode, with one thread per subcore. 3511 */ 3512 if (cpu_has_feature(CPU_FTR_ARCH_300)) 3513 return n_subcores <= 4 && n_threads == 1; 3514 3515 /* On POWER8, can only dynamically split if unsplit to begin with */ 3516 if (n_subcores > 1 && threads_per_subcore < MAX_SMT_THREADS) 3517 return false; 3518 if (n_subcores > MAX_SUBCORES) 3519 return false; 3520 if (n_subcores > 1) { 3521 if (!(dynamic_mt_modes & 2)) 3522 n_subcores = 4; 3523 if (n_subcores > 2 && !(dynamic_mt_modes & 4)) 3524 return false; 3525 } 3526 3527 return n_subcores * roundup_pow_of_two(n_threads) <= MAX_SMT_THREADS; 3528} 3529 3530static void init_vcore_to_run(struct kvmppc_vcore *vc) 3531{ 3532 vc->entry_exit_map = 0; 3533 vc->in_guest = 0; 3534 vc->napping_threads = 0; 3535 vc->conferring_threads = 0; 3536 vc->tb_offset_applied = 0; 3537} 3538 3539static bool can_dynamic_split(struct kvmppc_vcore *vc, struct core_info *cip) 3540{ 3541 int n_threads = vc->num_threads; 3542 int sub; 3543 3544 if (!cpu_has_feature(CPU_FTR_ARCH_207S)) 3545 return false; 3546 3547 /* In one_vm_per_core mode, require all vcores to be from the same vm */ 3548 if (one_vm_per_core && vc->kvm != cip->vc[0]->kvm) 3549 return false; 3550 3551 if (n_threads < cip->max_subcore_threads) 3552 n_threads = cip->max_subcore_threads; 3553 if (!subcore_config_ok(cip->n_subcores + 1, n_threads)) 3554 return false; 3555 cip->max_subcore_threads = n_threads; 3556 3557 sub = cip->n_subcores; 3558 ++cip->n_subcores; 3559 cip->total_threads += vc->num_threads; 3560 cip->subcore_threads[sub] = vc->num_threads; 3561 cip->vc[sub] = vc; 3562 init_vcore_to_run(vc); 3563 list_del_init(&vc->preempt_list); 3564 3565 return true; 3566} 3567 3568/* 3569 * Work out whether it is possible to piggyback the execution of 3570 * vcore *pvc onto the execution of the other vcores described in *cip. 3571 */ 3572static bool can_piggyback(struct kvmppc_vcore *pvc, struct core_info *cip, 3573 int target_threads) 3574{ 3575 if (cip->total_threads + pvc->num_threads > target_threads) 3576 return false; 3577 3578 return can_dynamic_split(pvc, cip); 3579} 3580 3581static void prepare_threads(struct kvmppc_vcore *vc) 3582{ 3583 int i; 3584 struct kvm_vcpu *vcpu; 3585 3586 for_each_runnable_thread(i, vcpu, vc) { 3587 if (signal_pending(vcpu->arch.run_task)) 3588 vcpu->arch.ret = -EINTR; 3589 else if (vcpu->arch.vpa.update_pending || 3590 vcpu->arch.slb_shadow.update_pending || 3591 vcpu->arch.dtl.update_pending) 3592 vcpu->arch.ret = RESUME_GUEST; 3593 else 3594 continue; 3595 kvmppc_remove_runnable(vc, vcpu, mftb()); 3596 wake_up(&vcpu->arch.cpu_run); 3597 } 3598} 3599 3600static void collect_piggybacks(struct core_info *cip, int target_threads) 3601{ 3602 struct preempted_vcore_list *lp = this_cpu_ptr(&preempted_vcores); 3603 struct kvmppc_vcore *pvc, *vcnext; 3604 3605 spin_lock(&lp->lock); 3606 list_for_each_entry_safe(pvc, vcnext, &lp->list, preempt_list) { 3607 if (!spin_trylock(&pvc->lock)) 3608 continue; 3609 prepare_threads(pvc); 3610 if (!pvc->n_runnable || !pvc->kvm->arch.mmu_ready) { 3611 list_del_init(&pvc->preempt_list); 3612 if (pvc->runner == NULL) { 3613 pvc->vcore_state = VCORE_INACTIVE; 3614 kvmppc_core_end_stolen(pvc, mftb()); 3615 } 3616 spin_unlock(&pvc->lock); 3617 continue; 3618 } 3619 if (!can_piggyback(pvc, cip, target_threads)) { 3620 spin_unlock(&pvc->lock); 3621 continue; 3622 } 3623 kvmppc_core_end_stolen(pvc, mftb()); 3624 pvc->vcore_state = VCORE_PIGGYBACK; 3625 if (cip->total_threads >= target_threads) 3626 break; 3627 } 3628 spin_unlock(&lp->lock); 3629} 3630 3631static bool recheck_signals_and_mmu(struct core_info *cip) 3632{ 3633 int sub, i; 3634 struct kvm_vcpu *vcpu; 3635 struct kvmppc_vcore *vc; 3636 3637 for (sub = 0; sub < cip->n_subcores; ++sub) { 3638 vc = cip->vc[sub]; 3639 if (!vc->kvm->arch.mmu_ready) 3640 return true; 3641 for_each_runnable_thread(i, vcpu, vc) 3642 if (signal_pending(vcpu->arch.run_task)) 3643 return true; 3644 } 3645 return false; 3646} 3647 3648static void post_guest_process(struct kvmppc_vcore *vc, bool is_master) 3649{ 3650 int still_running = 0, i; 3651 u64 now; 3652 long ret; 3653 struct kvm_vcpu *vcpu; 3654 3655 spin_lock(&vc->lock); 3656 now = get_tb(); 3657 for_each_runnable_thread(i, vcpu, vc) { 3658 /* 3659 * It's safe to unlock the vcore in the loop here, because 3660 * for_each_runnable_thread() is safe against removal of 3661 * the vcpu, and the vcore state is VCORE_EXITING here, 3662 * so any vcpus becoming runnable will have their arch.trap 3663 * set to zero and can't actually run in the guest. 3664 */ 3665 spin_unlock(&vc->lock); 3666 /* cancel pending dec exception if dec is positive */ 3667 if (now < kvmppc_dec_expires_host_tb(vcpu) && 3668 kvmppc_core_pending_dec(vcpu)) 3669 kvmppc_core_dequeue_dec(vcpu); 3670 3671 trace_kvm_guest_exit(vcpu); 3672 3673 ret = RESUME_GUEST; 3674 if (vcpu->arch.trap) 3675 ret = kvmppc_handle_exit_hv(vcpu, 3676 vcpu->arch.run_task); 3677 3678 vcpu->arch.ret = ret; 3679 vcpu->arch.trap = 0; 3680 3681 spin_lock(&vc->lock); 3682 if (is_kvmppc_resume_guest(vcpu->arch.ret)) { 3683 if (vcpu->arch.pending_exceptions) 3684 kvmppc_core_prepare_to_enter(vcpu); 3685 if (vcpu->arch.ceded) 3686 kvmppc_set_timer(vcpu); 3687 else 3688 ++still_running; 3689 } else { 3690 kvmppc_remove_runnable(vc, vcpu, mftb()); 3691 wake_up(&vcpu->arch.cpu_run); 3692 } 3693 } 3694 if (!is_master) { 3695 if (still_running > 0) { 3696 kvmppc_vcore_preempt(vc); 3697 } else if (vc->runner) { 3698 vc->vcore_state = VCORE_PREEMPT; 3699 kvmppc_core_start_stolen(vc, mftb()); 3700 } else { 3701 vc->vcore_state = VCORE_INACTIVE; 3702 } 3703 if (vc->n_runnable > 0 && vc->runner == NULL) { 3704 /* make sure there's a candidate runner awake */ 3705 i = -1; 3706 vcpu = next_runnable_thread(vc, &i); 3707 wake_up(&vcpu->arch.cpu_run); 3708 } 3709 } 3710 spin_unlock(&vc->lock); 3711} 3712 3713/* 3714 * Clear core from the list of active host cores as we are about to 3715 * enter the guest. Only do this if it is the primary thread of the 3716 * core (not if a subcore) that is entering the guest. 3717 */ 3718static inline int kvmppc_clear_host_core(unsigned int cpu) 3719{ 3720 int core; 3721 3722 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 3723 return 0; 3724 /* 3725 * Memory barrier can be omitted here as we will do a smp_wmb() 3726 * later in kvmppc_start_thread and we need ensure that state is 3727 * visible to other CPUs only after we enter guest. 3728 */ 3729 core = cpu >> threads_shift; 3730 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 0; 3731 return 0; 3732} 3733 3734/* 3735 * Advertise this core as an active host core since we exited the guest 3736 * Only need to do this if it is the primary thread of the core that is 3737 * exiting. 3738 */ 3739static inline int kvmppc_set_host_core(unsigned int cpu) 3740{ 3741 int core; 3742 3743 if (!kvmppc_host_rm_ops_hv || cpu_thread_in_core(cpu)) 3744 return 0; 3745 3746 /* 3747 * Memory barrier can be omitted here because we do a spin_unlock 3748 * immediately after this which provides the memory barrier. 3749 */ 3750 core = cpu >> threads_shift; 3751 kvmppc_host_rm_ops_hv->rm_core[core].rm_state.in_host = 1; 3752 return 0; 3753} 3754 3755static void set_irq_happened(int trap) 3756{ 3757 switch (trap) { 3758 case BOOK3S_INTERRUPT_EXTERNAL: 3759 local_paca->irq_happened |= PACA_IRQ_EE; 3760 break; 3761 case BOOK3S_INTERRUPT_H_DOORBELL: 3762 local_paca->irq_happened |= PACA_IRQ_DBELL; 3763 break; 3764 case BOOK3S_INTERRUPT_HMI: 3765 local_paca->irq_happened |= PACA_IRQ_HMI; 3766 break; 3767 case BOOK3S_INTERRUPT_SYSTEM_RESET: 3768 replay_system_reset(); 3769 break; 3770 } 3771} 3772 3773/* 3774 * Run a set of guest threads on a physical core. 3775 * Called with vc->lock held. 3776 */ 3777static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) 3778{ 3779 struct kvm_vcpu *vcpu; 3780 int i; 3781 int srcu_idx; 3782 struct core_info core_info; 3783 struct kvmppc_vcore *pvc; 3784 struct kvm_split_mode split_info, *sip; 3785 int split, subcore_size, active; 3786 int sub; 3787 bool thr0_done; 3788 unsigned long cmd_bit, stat_bit; 3789 int pcpu, thr; 3790 int target_threads; 3791 int controlled_threads; 3792 int trap; 3793 bool is_power8; 3794 3795 if (WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300))) 3796 return; 3797 3798 /* 3799 * Remove from the list any threads that have a signal pending 3800 * or need a VPA update done 3801 */ 3802 prepare_threads(vc); 3803 3804 /* if the runner is no longer runnable, let the caller pick a new one */ 3805 if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE) 3806 return; 3807 3808 /* 3809 * Initialize *vc. 3810 */ 3811 init_vcore_to_run(vc); 3812 vc->preempt_tb = TB_NIL; 3813 3814 /* 3815 * Number of threads that we will be controlling: the same as 3816 * the number of threads per subcore, except on POWER9, 3817 * where it's 1 because the threads are (mostly) independent. 3818 */ 3819 controlled_threads = threads_per_vcore(vc->kvm); 3820 3821 /* 3822 * Make sure we are running on primary threads, and that secondary 3823 * threads are offline. Also check if the number of threads in this 3824 * guest are greater than the current system threads per guest. 3825 */ 3826 if ((controlled_threads > 1) && 3827 ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) { 3828 for_each_runnable_thread(i, vcpu, vc) { 3829 vcpu->arch.ret = -EBUSY; 3830 kvmppc_remove_runnable(vc, vcpu, mftb()); 3831 wake_up(&vcpu->arch.cpu_run); 3832 } 3833 goto out; 3834 } 3835 3836 /* 3837 * See if we could run any other vcores on the physical core 3838 * along with this one. 3839 */ 3840 init_core_info(&core_info, vc); 3841 pcpu = smp_processor_id(); 3842 target_threads = controlled_threads; 3843 if (target_smt_mode && target_smt_mode < target_threads) 3844 target_threads = target_smt_mode; 3845 if (vc->num_threads < target_threads) 3846 collect_piggybacks(&core_info, target_threads); 3847 3848 /* 3849 * Hard-disable interrupts, and check resched flag and signals. 3850 * If we need to reschedule or deliver a signal, clean up 3851 * and return without going into the guest(s). 3852 * If the mmu_ready flag has been cleared, don't go into the 3853 * guest because that means a HPT resize operation is in progress. 3854 */ 3855 local_irq_disable(); 3856 hard_irq_disable(); 3857 if (lazy_irq_pending() || need_resched() || 3858 recheck_signals_and_mmu(&core_info)) { 3859 local_irq_enable(); 3860 vc->vcore_state = VCORE_INACTIVE; 3861 /* Unlock all except the primary vcore */ 3862 for (sub = 1; sub < core_info.n_subcores; ++sub) { 3863 pvc = core_info.vc[sub]; 3864 /* Put back on to the preempted vcores list */ 3865 kvmppc_vcore_preempt(pvc); 3866 spin_unlock(&pvc->lock); 3867 } 3868 for (i = 0; i < controlled_threads; ++i) 3869 kvmppc_release_hwthread(pcpu + i); 3870 return; 3871 } 3872 3873 kvmppc_clear_host_core(pcpu); 3874 3875 /* Decide on micro-threading (split-core) mode */ 3876 subcore_size = threads_per_subcore; 3877 cmd_bit = stat_bit = 0; 3878 split = core_info.n_subcores; 3879 sip = NULL; 3880 is_power8 = cpu_has_feature(CPU_FTR_ARCH_207S); 3881 3882 if (split > 1) { 3883 sip = &split_info; 3884 memset(&split_info, 0, sizeof(split_info)); 3885 for (sub = 0; sub < core_info.n_subcores; ++sub) 3886 split_info.vc[sub] = core_info.vc[sub]; 3887 3888 if (is_power8) { 3889 if (split == 2 && (dynamic_mt_modes & 2)) { 3890 cmd_bit = HID0_POWER8_1TO2LPAR; 3891 stat_bit = HID0_POWER8_2LPARMODE; 3892 } else { 3893 split = 4; 3894 cmd_bit = HID0_POWER8_1TO4LPAR; 3895 stat_bit = HID0_POWER8_4LPARMODE; 3896 } 3897 subcore_size = MAX_SMT_THREADS / split; 3898 split_info.rpr = mfspr(SPRN_RPR); 3899 split_info.pmmar = mfspr(SPRN_PMMAR); 3900 split_info.ldbar = mfspr(SPRN_LDBAR); 3901 split_info.subcore_size = subcore_size; 3902 } else { 3903 split_info.subcore_size = 1; 3904 } 3905 3906 /* order writes to split_info before kvm_split_mode pointer */ 3907 smp_wmb(); 3908 } 3909 3910 for (thr = 0; thr < controlled_threads; ++thr) { 3911 struct paca_struct *paca = paca_ptrs[pcpu + thr]; 3912 3913 paca->kvm_hstate.napping = 0; 3914 paca->kvm_hstate.kvm_split_mode = sip; 3915 } 3916 3917 /* Initiate micro-threading (split-core) on POWER8 if required */ 3918 if (cmd_bit) { 3919 unsigned long hid0 = mfspr(SPRN_HID0); 3920 3921 hid0 |= cmd_bit | HID0_POWER8_DYNLPARDIS; 3922 mb(); 3923 mtspr(SPRN_HID0, hid0); 3924 isync(); 3925 for (;;) { 3926 hid0 = mfspr(SPRN_HID0); 3927 if (hid0 & stat_bit) 3928 break; 3929 cpu_relax(); 3930 } 3931 } 3932 3933 /* 3934 * On POWER8, set RWMR register. 3935 * Since it only affects PURR and SPURR, it doesn't affect 3936 * the host, so we don't save/restore the host value. 3937 */ 3938 if (is_power8) { 3939 unsigned long rwmr_val = RWMR_RPA_P8_8THREAD; 3940 int n_online = atomic_read(&vc->online_count); 3941 3942 /* 3943 * Use the 8-thread value if we're doing split-core 3944 * or if the vcore's online count looks bogus. 3945 */ 3946 if (split == 1 && threads_per_subcore == MAX_SMT_THREADS && 3947 n_online >= 1 && n_online <= MAX_SMT_THREADS) 3948 rwmr_val = p8_rwmr_values[n_online]; 3949 mtspr(SPRN_RWMR, rwmr_val); 3950 } 3951 3952 /* Start all the threads */ 3953 active = 0; 3954 for (sub = 0; sub < core_info.n_subcores; ++sub) { 3955 thr = is_power8 ? subcore_thread_map[sub] : sub; 3956 thr0_done = false; 3957 active |= 1 << thr; 3958 pvc = core_info.vc[sub]; 3959 pvc->pcpu = pcpu + thr; 3960 for_each_runnable_thread(i, vcpu, pvc) { 3961 /* 3962 * XXX: is kvmppc_start_thread called too late here? 3963 * It updates vcpu->cpu and vcpu->arch.thread_cpu 3964 * which are used by kvmppc_fast_vcpu_kick_hv(), but 3965 * kick is called after new exceptions become available 3966 * and exceptions are checked earlier than here, by 3967 * kvmppc_core_prepare_to_enter. 3968 */ 3969 kvmppc_start_thread(vcpu, pvc); 3970 kvmppc_update_vpa_dispatch(vcpu, pvc); 3971 trace_kvm_guest_enter(vcpu); 3972 if (!vcpu->arch.ptid) 3973 thr0_done = true; 3974 active |= 1 << (thr + vcpu->arch.ptid); 3975 } 3976 /* 3977 * We need to start the first thread of each subcore 3978 * even if it doesn't have a vcpu. 3979 */ 3980 if (!thr0_done) 3981 kvmppc_start_thread(NULL, pvc); 3982 } 3983 3984 /* 3985 * Ensure that split_info.do_nap is set after setting 3986 * the vcore pointer in the PACA of the secondaries. 3987 */ 3988 smp_mb(); 3989 3990 /* 3991 * When doing micro-threading, poke the inactive threads as well. 3992 * This gets them to the nap instruction after kvm_do_nap, 3993 * which reduces the time taken to unsplit later. 3994 */ 3995 if (cmd_bit) { 3996 split_info.do_nap = 1; /* ask secondaries to nap when done */ 3997 for (thr = 1; thr < threads_per_subcore; ++thr) 3998 if (!(active & (1 << thr))) 3999 kvmppc_ipi_thread(pcpu + thr); 4000 } 4001 4002 vc->vcore_state = VCORE_RUNNING; 4003 preempt_disable(); 4004 4005 trace_kvmppc_run_core(vc, 0); 4006 4007 for (sub = 0; sub < core_info.n_subcores; ++sub) 4008 spin_unlock(&core_info.vc[sub]->lock); 4009 4010 guest_timing_enter_irqoff(); 4011 4012 srcu_idx = srcu_read_lock(&vc->kvm->srcu); 4013 4014 guest_state_enter_irqoff(); 4015 this_cpu_disable_ftrace(); 4016 4017 trap = __kvmppc_vcore_entry(); 4018 4019 this_cpu_enable_ftrace(); 4020 guest_state_exit_irqoff(); 4021 4022 srcu_read_unlock(&vc->kvm->srcu, srcu_idx); 4023 4024 set_irq_happened(trap); 4025 4026 spin_lock(&vc->lock); 4027 /* prevent other vcpu threads from doing kvmppc_start_thread() now */ 4028 vc->vcore_state = VCORE_EXITING; 4029 4030 /* wait for secondary threads to finish writing their state to memory */ 4031 kvmppc_wait_for_nap(controlled_threads); 4032 4033 /* Return to whole-core mode if we split the core earlier */ 4034 if (cmd_bit) { 4035 unsigned long hid0 = mfspr(SPRN_HID0); 4036 4037 hid0 &= ~HID0_POWER8_DYNLPARDIS; 4038 stat_bit = HID0_POWER8_2LPARMODE | HID0_POWER8_4LPARMODE; 4039 mb(); 4040 mtspr(SPRN_HID0, hid0); 4041 isync(); 4042 for (;;) { 4043 hid0 = mfspr(SPRN_HID0); 4044 if (!(hid0 & stat_bit)) 4045 break; 4046 cpu_relax(); 4047 } 4048 split_info.do_nap = 0; 4049 } 4050 4051 kvmppc_set_host_core(pcpu); 4052 4053 if (!vtime_accounting_enabled_this_cpu()) { 4054 local_irq_enable(); 4055 /* 4056 * Service IRQs here before guest_timing_exit_irqoff() so any 4057 * ticks that occurred while running the guest are accounted to 4058 * the guest. If vtime accounting is enabled, accounting uses 4059 * TB rather than ticks, so it can be done without enabling 4060 * interrupts here, which has the problem that it accounts 4061 * interrupt processing overhead to the host. 4062 */ 4063 local_irq_disable(); 4064 } 4065 guest_timing_exit_irqoff(); 4066 4067 local_irq_enable(); 4068 4069 /* Let secondaries go back to the offline loop */ 4070 for (i = 0; i < controlled_threads; ++i) { 4071 kvmppc_release_hwthread(pcpu + i); 4072 if (sip && sip->napped[i]) 4073 kvmppc_ipi_thread(pcpu + i); 4074 } 4075 4076 spin_unlock(&vc->lock); 4077 4078 /* make sure updates to secondary vcpu structs are visible now */ 4079 smp_mb(); 4080 4081 preempt_enable(); 4082 4083 for (sub = 0; sub < core_info.n_subcores; ++sub) { 4084 pvc = core_info.vc[sub]; 4085 post_guest_process(pvc, pvc == vc); 4086 } 4087 4088 spin_lock(&vc->lock); 4089 4090 out: 4091 vc->vcore_state = VCORE_INACTIVE; 4092 trace_kvmppc_run_core(vc, 1); 4093} 4094 4095static inline bool hcall_is_xics(unsigned long req) 4096{ 4097 return req == H_EOI || req == H_CPPR || req == H_IPI || 4098 req == H_IPOLL || req == H_XIRR || req == H_XIRR_X; 4099} 4100 4101static void vcpu_vpa_increment_dispatch(struct kvm_vcpu *vcpu) 4102{ 4103 struct lppaca *lp = vcpu->arch.vpa.pinned_addr; 4104 if (lp) { 4105 u32 yield_count = be32_to_cpu(lp->yield_count) + 1; 4106 lp->yield_count = cpu_to_be32(yield_count); 4107 vcpu->arch.vpa.dirty = 1; 4108 } 4109} 4110 4111/* Helper functions for reading L2's stats from L1's VPA */ 4112#ifdef CONFIG_PPC_PSERIES 4113static DEFINE_PER_CPU(u64, l1_to_l2_cs); 4114static DEFINE_PER_CPU(u64, l2_to_l1_cs); 4115static DEFINE_PER_CPU(u64, l2_runtime_agg); 4116 4117int kvmhv_get_l2_counters_status(void) 4118{ 4119 return firmware_has_feature(FW_FEATURE_LPAR) && 4120 get_lppaca()->l2_counters_enable; 4121} 4122 4123void kvmhv_set_l2_counters_status(int cpu, bool status) 4124{ 4125 if (!firmware_has_feature(FW_FEATURE_LPAR)) 4126 return; 4127 if (status) 4128 lppaca_of(cpu).l2_counters_enable = 1; 4129 else 4130 lppaca_of(cpu).l2_counters_enable = 0; 4131} 4132EXPORT_SYMBOL(kvmhv_set_l2_counters_status); 4133 4134int kvmhv_counters_tracepoint_regfunc(void) 4135{ 4136 int cpu; 4137 4138 for_each_present_cpu(cpu) { 4139 kvmhv_set_l2_counters_status(cpu, true); 4140 } 4141 return 0; 4142} 4143 4144void kvmhv_counters_tracepoint_unregfunc(void) 4145{ 4146 int cpu; 4147 4148 for_each_present_cpu(cpu) { 4149 kvmhv_set_l2_counters_status(cpu, false); 4150 } 4151} 4152 4153static void do_trace_nested_cs_time(struct kvm_vcpu *vcpu) 4154{ 4155 struct lppaca *lp = get_lppaca(); 4156 u64 l1_to_l2_ns, l2_to_l1_ns, l2_runtime_ns; 4157 u64 *l1_to_l2_cs_ptr = this_cpu_ptr(&l1_to_l2_cs); 4158 u64 *l2_to_l1_cs_ptr = this_cpu_ptr(&l2_to_l1_cs); 4159 u64 *l2_runtime_agg_ptr = this_cpu_ptr(&l2_runtime_agg); 4160 4161 l1_to_l2_ns = tb_to_ns(be64_to_cpu(lp->l1_to_l2_cs_tb)); 4162 l2_to_l1_ns = tb_to_ns(be64_to_cpu(lp->l2_to_l1_cs_tb)); 4163 l2_runtime_ns = tb_to_ns(be64_to_cpu(lp->l2_runtime_tb)); 4164 trace_kvmppc_vcpu_stats(vcpu, l1_to_l2_ns - *l1_to_l2_cs_ptr, 4165 l2_to_l1_ns - *l2_to_l1_cs_ptr, 4166 l2_runtime_ns - *l2_runtime_agg_ptr); 4167 *l1_to_l2_cs_ptr = l1_to_l2_ns; 4168 *l2_to_l1_cs_ptr = l2_to_l1_ns; 4169 *l2_runtime_agg_ptr = l2_runtime_ns; 4170 vcpu->arch.l1_to_l2_cs = l1_to_l2_ns; 4171 vcpu->arch.l2_to_l1_cs = l2_to_l1_ns; 4172 vcpu->arch.l2_runtime_agg = l2_runtime_ns; 4173} 4174 4175u64 kvmhv_get_l1_to_l2_cs_time(void) 4176{ 4177 return tb_to_ns(be64_to_cpu(get_lppaca()->l1_to_l2_cs_tb)); 4178} 4179EXPORT_SYMBOL(kvmhv_get_l1_to_l2_cs_time); 4180 4181u64 kvmhv_get_l2_to_l1_cs_time(void) 4182{ 4183 return tb_to_ns(be64_to_cpu(get_lppaca()->l2_to_l1_cs_tb)); 4184} 4185EXPORT_SYMBOL(kvmhv_get_l2_to_l1_cs_time); 4186 4187u64 kvmhv_get_l2_runtime_agg(void) 4188{ 4189 return tb_to_ns(be64_to_cpu(get_lppaca()->l2_runtime_tb)); 4190} 4191EXPORT_SYMBOL(kvmhv_get_l2_runtime_agg); 4192 4193u64 kvmhv_get_l1_to_l2_cs_time_vcpu(void) 4194{ 4195 struct kvm_vcpu *vcpu; 4196 struct kvm_vcpu_arch *arch; 4197 4198 vcpu = local_paca->kvm_hstate.kvm_vcpu; 4199 if (vcpu) { 4200 arch = &vcpu->arch; 4201 return arch->l1_to_l2_cs; 4202 } else { 4203 return 0; 4204 } 4205} 4206EXPORT_SYMBOL(kvmhv_get_l1_to_l2_cs_time_vcpu); 4207 4208u64 kvmhv_get_l2_to_l1_cs_time_vcpu(void) 4209{ 4210 struct kvm_vcpu *vcpu; 4211 struct kvm_vcpu_arch *arch; 4212 4213 vcpu = local_paca->kvm_hstate.kvm_vcpu; 4214 if (vcpu) { 4215 arch = &vcpu->arch; 4216 return arch->l2_to_l1_cs; 4217 } else { 4218 return 0; 4219 } 4220} 4221EXPORT_SYMBOL(kvmhv_get_l2_to_l1_cs_time_vcpu); 4222 4223u64 kvmhv_get_l2_runtime_agg_vcpu(void) 4224{ 4225 struct kvm_vcpu *vcpu; 4226 struct kvm_vcpu_arch *arch; 4227 4228 vcpu = local_paca->kvm_hstate.kvm_vcpu; 4229 if (vcpu) { 4230 arch = &vcpu->arch; 4231 return arch->l2_runtime_agg; 4232 } else { 4233 return 0; 4234 } 4235} 4236EXPORT_SYMBOL(kvmhv_get_l2_runtime_agg_vcpu); 4237 4238#else 4239int kvmhv_get_l2_counters_status(void) 4240{ 4241 return 0; 4242} 4243 4244static void do_trace_nested_cs_time(struct kvm_vcpu *vcpu) 4245{ 4246} 4247#endif 4248 4249static int kvmhv_vcpu_entry_nestedv2(struct kvm_vcpu *vcpu, u64 time_limit, 4250 unsigned long lpcr, u64 *tb) 4251{ 4252 struct kvmhv_nestedv2_io *io; 4253 unsigned long msr, i; 4254 int trap; 4255 long rc; 4256 4257 if (vcpu->arch.doorbell_request) { 4258 vcpu->arch.doorbell_request = 0; 4259 kvmppc_set_dpdes(vcpu, 1); 4260 } 4261 4262 io = &vcpu->arch.nestedv2_io; 4263 4264 msr = mfmsr(); 4265 kvmppc_msr_hard_disable_set_facilities(vcpu, msr); 4266 if (lazy_irq_pending()) 4267 return 0; 4268 4269 rc = kvmhv_nestedv2_flush_vcpu(vcpu, time_limit); 4270 if (rc < 0) 4271 return -EINVAL; 4272 4273 kvmppc_gse_put_u64(io->vcpu_run_input, KVMPPC_GSID_LPCR, lpcr); 4274 4275 accumulate_time(vcpu, &vcpu->arch.in_guest); 4276 rc = plpar_guest_run_vcpu(0, vcpu->kvm->arch.lpid, vcpu->vcpu_id, 4277 &trap, &i); 4278 4279 if (rc != H_SUCCESS) { 4280 pr_err("KVM Guest Run VCPU hcall failed\n"); 4281 if (rc == H_INVALID_ELEMENT_ID) 4282 pr_err("KVM: Guest Run VCPU invalid element id at %ld\n", i); 4283 else if (rc == H_INVALID_ELEMENT_SIZE) 4284 pr_err("KVM: Guest Run VCPU invalid element size at %ld\n", i); 4285 else if (rc == H_INVALID_ELEMENT_VALUE) 4286 pr_err("KVM: Guest Run VCPU invalid element value at %ld\n", i); 4287 return -EINVAL; 4288 } 4289 accumulate_time(vcpu, &vcpu->arch.guest_exit); 4290 4291 *tb = mftb(); 4292 kvmppc_gsm_reset(io->vcpu_message); 4293 kvmppc_gsm_reset(io->vcore_message); 4294 kvmppc_gsbm_zero(&io->valids); 4295 4296 rc = kvmhv_nestedv2_parse_output(vcpu); 4297 if (rc < 0) 4298 return -EINVAL; 4299 4300 timer_rearm_host_dec(*tb); 4301 4302 /* Record context switch and guest_run_time data */ 4303 if (kvmhv_get_l2_counters_status()) 4304 do_trace_nested_cs_time(vcpu); 4305 4306 return trap; 4307} 4308 4309/* call our hypervisor to load up HV regs and go */ 4310static int kvmhv_vcpu_entry_p9_nested(struct kvm_vcpu *vcpu, u64 time_limit, unsigned long lpcr, u64 *tb) 4311{ 4312 unsigned long host_psscr; 4313 unsigned long msr; 4314 struct hv_guest_state hvregs; 4315 struct p9_host_os_sprs host_os_sprs; 4316 s64 dec; 4317 int trap; 4318 4319 msr = mfmsr(); 4320 4321 save_p9_host_os_sprs(&host_os_sprs); 4322 4323 /* 4324 * We need to save and restore the guest visible part of the 4325 * psscr (i.e. using SPRN_PSSCR_PR) since the hypervisor 4326 * doesn't do this for us. Note only required if pseries since 4327 * this is done in kvmhv_vcpu_entry_p9() below otherwise. 4328 */ 4329 host_psscr = mfspr(SPRN_PSSCR_PR); 4330 4331 kvmppc_msr_hard_disable_set_facilities(vcpu, msr); 4332 if (lazy_irq_pending()) 4333 return 0; 4334 4335 if (unlikely(load_vcpu_state(vcpu, &host_os_sprs))) 4336 msr = mfmsr(); /* TM restore can update msr */ 4337 4338 if (vcpu->arch.psscr != host_psscr) 4339 mtspr(SPRN_PSSCR_PR, vcpu->arch.psscr); 4340 4341 kvmhv_save_hv_regs(vcpu, &hvregs); 4342 hvregs.lpcr = lpcr; 4343 hvregs.amor = ~0; 4344 vcpu->arch.regs.msr = vcpu->arch.shregs.msr; 4345 hvregs.version = HV_GUEST_STATE_VERSION; 4346 if (vcpu->arch.nested) { 4347 hvregs.lpid = vcpu->arch.nested->shadow_lpid; 4348 hvregs.vcpu_token = vcpu->arch.nested_vcpu_id; 4349 } else { 4350 hvregs.lpid = vcpu->kvm->arch.lpid; 4351 hvregs.vcpu_token = vcpu->vcpu_id; 4352 } 4353 hvregs.hdec_expiry = time_limit; 4354 4355 /* 4356 * hvregs has the doorbell status, so zero it here which 4357 * enables us to receive doorbells when H_ENTER_NESTED is 4358 * in progress for this vCPU 4359 */ 4360 4361 if (vcpu->arch.doorbell_request) 4362 vcpu->arch.doorbell_request = 0; 4363 4364 /* 4365 * When setting DEC, we must always deal with irq_work_raise 4366 * via NMI vs setting DEC. The problem occurs right as we 4367 * switch into guest mode if a NMI hits and sets pending work 4368 * and sets DEC, then that will apply to the guest and not 4369 * bring us back to the host. 4370 * 4371 * irq_work_raise could check a flag (or possibly LPCR[HDICE] 4372 * for example) and set HDEC to 1? That wouldn't solve the 4373 * nested hv case which needs to abort the hcall or zero the 4374 * time limit. 4375 * 4376 * XXX: Another day's problem. 4377 */ 4378 mtspr(SPRN_DEC, kvmppc_dec_expires_host_tb(vcpu) - *tb); 4379 4380 mtspr(SPRN_DAR, vcpu->arch.shregs.dar); 4381 mtspr(SPRN_DSISR, vcpu->arch.shregs.dsisr); 4382 switch_pmu_to_guest(vcpu, &host_os_sprs); 4383 accumulate_time(vcpu, &vcpu->arch.in_guest); 4384 trap = plpar_hcall_norets(H_ENTER_NESTED, __pa(&hvregs), 4385 __pa(&vcpu->arch.regs)); 4386 accumulate_time(vcpu, &vcpu->arch.guest_exit); 4387 kvmhv_restore_hv_return_state(vcpu, &hvregs); 4388 switch_pmu_to_host(vcpu, &host_os_sprs); 4389 vcpu->arch.shregs.msr = vcpu->arch.regs.msr; 4390 vcpu->arch.shregs.dar = mfspr(SPRN_DAR); 4391 vcpu->arch.shregs.dsisr = mfspr(SPRN_DSISR); 4392 vcpu->arch.psscr = mfspr(SPRN_PSSCR_PR); 4393 4394 store_vcpu_state(vcpu); 4395 4396 dec = mfspr(SPRN_DEC); 4397 if (!(lpcr & LPCR_LD)) /* Sign extend if not using large decrementer */ 4398 dec = (s32) dec; 4399 *tb = mftb(); 4400 vcpu->arch.dec_expires = dec + (*tb + kvmppc_get_tb_offset(vcpu)); 4401 4402 timer_rearm_host_dec(*tb); 4403 4404 restore_p9_host_os_sprs(vcpu, &host_os_sprs); 4405 if (vcpu->arch.psscr != host_psscr) 4406 mtspr(SPRN_PSSCR_PR, host_psscr); 4407 4408 return trap; 4409} 4410 4411/* 4412 * Guest entry for POWER9 and later CPUs. 4413 */ 4414static int kvmhv_p9_guest_entry(struct kvm_vcpu *vcpu, u64 time_limit, 4415 unsigned long lpcr, u64 *tb) 4416{ 4417 struct kvm *kvm = vcpu->kvm; 4418 struct kvm_nested_guest *nested = vcpu->arch.nested; 4419 u64 next_timer; 4420 int trap; 4421 4422 next_timer = timer_get_next_tb(); 4423 if (*tb >= next_timer) 4424 return BOOK3S_INTERRUPT_HV_DECREMENTER; 4425 if (next_timer < time_limit) 4426 time_limit = next_timer; 4427 else if (*tb >= time_limit) /* nested time limit */ 4428 return BOOK3S_INTERRUPT_NESTED_HV_DECREMENTER; 4429 4430 vcpu->arch.ceded = 0; 4431 4432 vcpu_vpa_increment_dispatch(vcpu); 4433 4434 if (kvmhv_on_pseries()) { 4435 if (kvmhv_is_nestedv1()) 4436 trap = kvmhv_vcpu_entry_p9_nested(vcpu, time_limit, lpcr, tb); 4437 else 4438 trap = kvmhv_vcpu_entry_nestedv2(vcpu, time_limit, lpcr, tb); 4439 4440 /* H_CEDE has to be handled now, not later */ 4441 if (trap == BOOK3S_INTERRUPT_SYSCALL && !nested && 4442 kvmppc_get_gpr(vcpu, 3) == H_CEDE) { 4443 kvmppc_cede(vcpu); 4444 kvmppc_set_gpr(vcpu, 3, 0); 4445 trap = 0; 4446 } 4447 4448 } else if (nested) { 4449 __this_cpu_write(cpu_in_guest, kvm); 4450 trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb); 4451 __this_cpu_write(cpu_in_guest, NULL); 4452 4453 } else { 4454 kvmppc_xive_push_vcpu(vcpu); 4455 4456 __this_cpu_write(cpu_in_guest, kvm); 4457 trap = kvmhv_vcpu_entry_p9(vcpu, time_limit, lpcr, tb); 4458 __this_cpu_write(cpu_in_guest, NULL); 4459 4460 if (trap == BOOK3S_INTERRUPT_SYSCALL && 4461 !(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) { 4462 unsigned long req = kvmppc_get_gpr(vcpu, 3); 4463 4464 /* 4465 * XIVE rearm and XICS hcalls must be handled 4466 * before xive context is pulled (is this 4467 * true?) 4468 */ 4469 if (req == H_CEDE) { 4470 /* H_CEDE has to be handled now */ 4471 kvmppc_cede(vcpu); 4472 if (!kvmppc_xive_rearm_escalation(vcpu)) { 4473 /* 4474 * Pending escalation so abort 4475 * the cede. 4476 */ 4477 vcpu->arch.ceded = 0; 4478 } 4479 kvmppc_set_gpr(vcpu, 3, 0); 4480 trap = 0; 4481 4482 } else if (req == H_ENTER_NESTED) { 4483 /* 4484 * L2 should not run with the L1 4485 * context so rearm and pull it. 4486 */ 4487 if (!kvmppc_xive_rearm_escalation(vcpu)) { 4488 /* 4489 * Pending escalation so abort 4490 * H_ENTER_NESTED. 4491 */ 4492 kvmppc_set_gpr(vcpu, 3, 0); 4493 trap = 0; 4494 } 4495 4496 } else if (hcall_is_xics(req)) { 4497 int ret; 4498 4499 ret = kvmppc_xive_xics_hcall(vcpu, req); 4500 if (ret != H_TOO_HARD) { 4501 kvmppc_set_gpr(vcpu, 3, ret); 4502 trap = 0; 4503 } 4504 } 4505 } 4506 kvmppc_xive_pull_vcpu(vcpu); 4507 4508 if (kvm_is_radix(kvm)) 4509 vcpu->arch.slb_max = 0; 4510 } 4511 4512 vcpu_vpa_increment_dispatch(vcpu); 4513 4514 return trap; 4515} 4516 4517/* 4518 * Wait for some other vcpu thread to execute us, and 4519 * wake us up when we need to handle something in the host. 4520 */ 4521static void kvmppc_wait_for_exec(struct kvmppc_vcore *vc, 4522 struct kvm_vcpu *vcpu, int wait_state) 4523{ 4524 DEFINE_WAIT(wait); 4525 4526 prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state); 4527 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 4528 spin_unlock(&vc->lock); 4529 schedule(); 4530 spin_lock(&vc->lock); 4531 } 4532 finish_wait(&vcpu->arch.cpu_run, &wait); 4533} 4534 4535static void grow_halt_poll_ns(struct kvmppc_vcore *vc) 4536{ 4537 if (!halt_poll_ns_grow) 4538 return; 4539 4540 vc->halt_poll_ns *= halt_poll_ns_grow; 4541 if (vc->halt_poll_ns < halt_poll_ns_grow_start) 4542 vc->halt_poll_ns = halt_poll_ns_grow_start; 4543} 4544 4545static void shrink_halt_poll_ns(struct kvmppc_vcore *vc) 4546{ 4547 if (halt_poll_ns_shrink == 0) 4548 vc->halt_poll_ns = 0; 4549 else 4550 vc->halt_poll_ns /= halt_poll_ns_shrink; 4551} 4552 4553#ifdef CONFIG_KVM_XICS 4554static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) 4555{ 4556 if (!xics_on_xive()) 4557 return false; 4558 return vcpu->arch.irq_pending || vcpu->arch.xive_saved_state.pipr < 4559 vcpu->arch.xive_saved_state.cppr; 4560} 4561#else 4562static inline bool xive_interrupt_pending(struct kvm_vcpu *vcpu) 4563{ 4564 return false; 4565} 4566#endif /* CONFIG_KVM_XICS */ 4567 4568static bool kvmppc_vcpu_woken(struct kvm_vcpu *vcpu) 4569{ 4570 if (vcpu->arch.pending_exceptions || vcpu->arch.prodded || 4571 kvmppc_doorbell_pending(vcpu) || xive_interrupt_pending(vcpu)) 4572 return true; 4573 4574 return false; 4575} 4576 4577static bool kvmppc_vcpu_check_block(struct kvm_vcpu *vcpu) 4578{ 4579 if (!vcpu->arch.ceded || kvmppc_vcpu_woken(vcpu)) 4580 return true; 4581 return false; 4582} 4583 4584/* 4585 * Check to see if any of the runnable vcpus on the vcore have pending 4586 * exceptions or are no longer ceded 4587 */ 4588static int kvmppc_vcore_check_block(struct kvmppc_vcore *vc) 4589{ 4590 struct kvm_vcpu *vcpu; 4591 int i; 4592 4593 for_each_runnable_thread(i, vcpu, vc) { 4594 if (kvmppc_vcpu_check_block(vcpu)) 4595 return 1; 4596 } 4597 4598 return 0; 4599} 4600 4601/* 4602 * All the vcpus in this vcore are idle, so wait for a decrementer 4603 * or external interrupt to one of the vcpus. vc->lock is held. 4604 */ 4605static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc) 4606{ 4607 ktime_t cur, start_poll, start_wait; 4608 int do_sleep = 1; 4609 u64 block_ns; 4610 4611 WARN_ON_ONCE(cpu_has_feature(CPU_FTR_ARCH_300)); 4612 4613 /* Poll for pending exceptions and ceded state */ 4614 cur = start_poll = ktime_get(); 4615 if (vc->halt_poll_ns) { 4616 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns); 4617 ++vc->runner->stat.generic.halt_attempted_poll; 4618 4619 vc->vcore_state = VCORE_POLLING; 4620 spin_unlock(&vc->lock); 4621 4622 do { 4623 if (kvmppc_vcore_check_block(vc)) { 4624 do_sleep = 0; 4625 break; 4626 } 4627 cur = ktime_get(); 4628 } while (kvm_vcpu_can_poll(cur, stop)); 4629 4630 spin_lock(&vc->lock); 4631 vc->vcore_state = VCORE_INACTIVE; 4632 4633 if (!do_sleep) { 4634 ++vc->runner->stat.generic.halt_successful_poll; 4635 goto out; 4636 } 4637 } 4638 4639 prepare_to_rcuwait(&vc->wait); 4640 set_current_state(TASK_INTERRUPTIBLE); 4641 if (kvmppc_vcore_check_block(vc)) { 4642 finish_rcuwait(&vc->wait); 4643 do_sleep = 0; 4644 /* If we polled, count this as a successful poll */ 4645 if (vc->halt_poll_ns) 4646 ++vc->runner->stat.generic.halt_successful_poll; 4647 goto out; 4648 } 4649 4650 start_wait = ktime_get(); 4651 4652 vc->vcore_state = VCORE_SLEEPING; 4653 trace_kvmppc_vcore_blocked(vc->runner, 0); 4654 spin_unlock(&vc->lock); 4655 schedule(); 4656 finish_rcuwait(&vc->wait); 4657 spin_lock(&vc->lock); 4658 vc->vcore_state = VCORE_INACTIVE; 4659 trace_kvmppc_vcore_blocked(vc->runner, 1); 4660 ++vc->runner->stat.halt_successful_wait; 4661 4662 cur = ktime_get(); 4663 4664out: 4665 block_ns = ktime_to_ns(cur) - ktime_to_ns(start_poll); 4666 4667 /* Attribute wait time */ 4668 if (do_sleep) { 4669 vc->runner->stat.generic.halt_wait_ns += 4670 ktime_to_ns(cur) - ktime_to_ns(start_wait); 4671 KVM_STATS_LOG_HIST_UPDATE( 4672 vc->runner->stat.generic.halt_wait_hist, 4673 ktime_to_ns(cur) - ktime_to_ns(start_wait)); 4674 /* Attribute failed poll time */ 4675 if (vc->halt_poll_ns) { 4676 vc->runner->stat.generic.halt_poll_fail_ns += 4677 ktime_to_ns(start_wait) - 4678 ktime_to_ns(start_poll); 4679 KVM_STATS_LOG_HIST_UPDATE( 4680 vc->runner->stat.generic.halt_poll_fail_hist, 4681 ktime_to_ns(start_wait) - 4682 ktime_to_ns(start_poll)); 4683 } 4684 } else { 4685 /* Attribute successful poll time */ 4686 if (vc->halt_poll_ns) { 4687 vc->runner->stat.generic.halt_poll_success_ns += 4688 ktime_to_ns(cur) - 4689 ktime_to_ns(start_poll); 4690 KVM_STATS_LOG_HIST_UPDATE( 4691 vc->runner->stat.generic.halt_poll_success_hist, 4692 ktime_to_ns(cur) - ktime_to_ns(start_poll)); 4693 } 4694 } 4695 4696 /* Adjust poll time */ 4697 if (halt_poll_ns) { 4698 if (block_ns <= vc->halt_poll_ns) 4699 ; 4700 /* We slept and blocked for longer than the max halt time */ 4701 else if (vc->halt_poll_ns && block_ns > halt_poll_ns) 4702 shrink_halt_poll_ns(vc); 4703 /* We slept and our poll time is too small */ 4704 else if (vc->halt_poll_ns < halt_poll_ns && 4705 block_ns < halt_poll_ns) 4706 grow_halt_poll_ns(vc); 4707 if (vc->halt_poll_ns > halt_poll_ns) 4708 vc->halt_poll_ns = halt_poll_ns; 4709 } else 4710 vc->halt_poll_ns = 0; 4711 4712 trace_kvmppc_vcore_wakeup(do_sleep, block_ns); 4713} 4714 4715/* 4716 * This never fails for a radix guest, as none of the operations it does 4717 * for a radix guest can fail or have a way to report failure. 4718 */ 4719static int kvmhv_setup_mmu(struct kvm_vcpu *vcpu) 4720{ 4721 int r = 0; 4722 struct kvm *kvm = vcpu->kvm; 4723 4724 mutex_lock(&kvm->arch.mmu_setup_lock); 4725 if (!kvm->arch.mmu_ready) { 4726 if (!kvm_is_radix(kvm)) 4727 r = kvmppc_hv_setup_htab_rma(vcpu); 4728 if (!r) { 4729 if (cpu_has_feature(CPU_FTR_ARCH_300)) 4730 kvmppc_setup_partition_table(kvm); 4731 kvm->arch.mmu_ready = 1; 4732 } 4733 } 4734 mutex_unlock(&kvm->arch.mmu_setup_lock); 4735 return r; 4736} 4737 4738static int kvmppc_run_vcpu(struct kvm_vcpu *vcpu) 4739{ 4740 struct kvm_run *run = vcpu->run; 4741 int n_ceded, i, r; 4742 struct kvmppc_vcore *vc; 4743 struct kvm_vcpu *v; 4744 4745 trace_kvmppc_run_vcpu_enter(vcpu); 4746 4747 run->exit_reason = 0; 4748 vcpu->arch.ret = RESUME_GUEST; 4749 vcpu->arch.trap = 0; 4750 kvmppc_update_vpas(vcpu); 4751 4752 /* 4753 * Synchronize with other threads in this virtual core 4754 */ 4755 vc = vcpu->arch.vcore; 4756 spin_lock(&vc->lock); 4757 vcpu->arch.ceded = 0; 4758 vcpu->arch.run_task = current; 4759 vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb()); 4760 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 4761 vcpu->arch.busy_preempt = TB_NIL; 4762 WRITE_ONCE(vc->runnable_threads[vcpu->arch.ptid], vcpu); 4763 ++vc->n_runnable; 4764 4765 /* 4766 * This happens the first time this is called for a vcpu. 4767 * If the vcore is already running, we may be able to start 4768 * this thread straight away and have it join in. 4769 */ 4770 if (!signal_pending(current)) { 4771 if ((vc->vcore_state == VCORE_PIGGYBACK || 4772 vc->vcore_state == VCORE_RUNNING) && 4773 !VCORE_IS_EXITING(vc)) { 4774 kvmppc_update_vpa_dispatch(vcpu, vc); 4775 kvmppc_start_thread(vcpu, vc); 4776 trace_kvm_guest_enter(vcpu); 4777 } else if (vc->vcore_state == VCORE_SLEEPING) { 4778 rcuwait_wake_up(&vc->wait); 4779 } 4780 4781 } 4782 4783 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 4784 !signal_pending(current)) { 4785 /* See if the MMU is ready to go */ 4786 if (!vcpu->kvm->arch.mmu_ready) { 4787 spin_unlock(&vc->lock); 4788 r = kvmhv_setup_mmu(vcpu); 4789 spin_lock(&vc->lock); 4790 if (r) { 4791 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4792 run->fail_entry. 4793 hardware_entry_failure_reason = 0; 4794 vcpu->arch.ret = r; 4795 break; 4796 } 4797 } 4798 4799 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 4800 kvmppc_vcore_end_preempt(vc); 4801 4802 if (vc->vcore_state != VCORE_INACTIVE) { 4803 kvmppc_wait_for_exec(vc, vcpu, TASK_INTERRUPTIBLE); 4804 continue; 4805 } 4806 for_each_runnable_thread(i, v, vc) { 4807 kvmppc_core_prepare_to_enter(v); 4808 if (signal_pending(v->arch.run_task)) { 4809 kvmppc_remove_runnable(vc, v, mftb()); 4810 v->stat.signal_exits++; 4811 v->run->exit_reason = KVM_EXIT_INTR; 4812 v->arch.ret = -EINTR; 4813 wake_up(&v->arch.cpu_run); 4814 } 4815 } 4816 if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE) 4817 break; 4818 n_ceded = 0; 4819 for_each_runnable_thread(i, v, vc) { 4820 if (!kvmppc_vcpu_woken(v)) 4821 n_ceded += v->arch.ceded; 4822 else 4823 v->arch.ceded = 0; 4824 } 4825 vc->runner = vcpu; 4826 if (n_ceded == vc->n_runnable) { 4827 kvmppc_vcore_blocked(vc); 4828 } else if (need_resched()) { 4829 kvmppc_vcore_preempt(vc); 4830 /* Let something else run */ 4831 cond_resched_lock(&vc->lock); 4832 if (vc->vcore_state == VCORE_PREEMPT) 4833 kvmppc_vcore_end_preempt(vc); 4834 } else { 4835 kvmppc_run_core(vc); 4836 } 4837 vc->runner = NULL; 4838 } 4839 4840 while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE && 4841 (vc->vcore_state == VCORE_RUNNING || 4842 vc->vcore_state == VCORE_EXITING || 4843 vc->vcore_state == VCORE_PIGGYBACK)) 4844 kvmppc_wait_for_exec(vc, vcpu, TASK_UNINTERRUPTIBLE); 4845 4846 if (vc->vcore_state == VCORE_PREEMPT && vc->runner == NULL) 4847 kvmppc_vcore_end_preempt(vc); 4848 4849 if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) { 4850 kvmppc_remove_runnable(vc, vcpu, mftb()); 4851 vcpu->stat.signal_exits++; 4852 run->exit_reason = KVM_EXIT_INTR; 4853 vcpu->arch.ret = -EINTR; 4854 } 4855 4856 if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) { 4857 /* Wake up some vcpu to run the core */ 4858 i = -1; 4859 v = next_runnable_thread(vc, &i); 4860 wake_up(&v->arch.cpu_run); 4861 } 4862 4863 trace_kvmppc_run_vcpu_exit(vcpu); 4864 spin_unlock(&vc->lock); 4865 return vcpu->arch.ret; 4866} 4867 4868int kvmhv_run_single_vcpu(struct kvm_vcpu *vcpu, u64 time_limit, 4869 unsigned long lpcr) 4870{ 4871 struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu); 4872 struct kvm_run *run = vcpu->run; 4873 int trap, r, pcpu; 4874 int srcu_idx; 4875 struct kvmppc_vcore *vc; 4876 struct kvm *kvm = vcpu->kvm; 4877 struct kvm_nested_guest *nested = vcpu->arch.nested; 4878 unsigned long flags; 4879 u64 tb; 4880 4881 trace_kvmppc_run_vcpu_enter(vcpu); 4882 4883 run->exit_reason = 0; 4884 vcpu->arch.ret = RESUME_GUEST; 4885 vcpu->arch.trap = 0; 4886 4887 vc = vcpu->arch.vcore; 4888 vcpu->arch.ceded = 0; 4889 vcpu->arch.run_task = current; 4890 vcpu->arch.last_inst = KVM_INST_FETCH_FAILED; 4891 4892 /* See if the MMU is ready to go */ 4893 if (unlikely(!kvm->arch.mmu_ready)) { 4894 r = kvmhv_setup_mmu(vcpu); 4895 if (r) { 4896 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 4897 run->fail_entry.hardware_entry_failure_reason = 0; 4898 vcpu->arch.ret = r; 4899 return r; 4900 } 4901 } 4902 4903 if (need_resched()) 4904 cond_resched(); 4905 4906 kvmppc_update_vpas(vcpu); 4907 4908 preempt_disable(); 4909 pcpu = smp_processor_id(); 4910 if (kvm_is_radix(kvm)) 4911 kvmppc_prepare_radix_vcpu(vcpu, pcpu); 4912 4913 /* flags save not required, but irq_pmu has no disable/enable API */ 4914 powerpc_local_irq_pmu_save(flags); 4915 4916 vcpu->arch.state = KVMPPC_VCPU_RUNNABLE; 4917 4918 if (signal_pending(current)) 4919 goto sigpend; 4920 if (need_resched() || !kvm->arch.mmu_ready) 4921 goto out; 4922 4923 vcpu->cpu = pcpu; 4924 vcpu->arch.thread_cpu = pcpu; 4925 vc->pcpu = pcpu; 4926 local_paca->kvm_hstate.kvm_vcpu = vcpu; 4927 local_paca->kvm_hstate.ptid = 0; 4928 local_paca->kvm_hstate.fake_suspend = 0; 4929 4930 /* 4931 * Orders set cpu/thread_cpu vs testing for pending interrupts and 4932 * doorbells below. The other side is when these fields are set vs 4933 * kvmppc_fast_vcpu_kick_hv reading the cpu/thread_cpu fields to 4934 * kick a vCPU to notice the pending interrupt. 4935 */ 4936 smp_mb(); 4937 4938 if (!nested) { 4939 kvmppc_core_prepare_to_enter(vcpu); 4940 if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, 4941 &vcpu->arch.pending_exceptions) || 4942 xive_interrupt_pending(vcpu)) { 4943 /* 4944 * For nested HV, don't synthesize but always pass MER, 4945 * the L0 will be able to optimise that more 4946 * effectively than manipulating registers directly. 4947 */ 4948 if (!kvmhv_on_pseries() && (__kvmppc_get_msr_hv(vcpu) & MSR_EE)) 4949 kvmppc_inject_interrupt_hv(vcpu, 4950 BOOK3S_INTERRUPT_EXTERNAL, 0); 4951 else 4952 lpcr |= LPCR_MER; 4953 } else { 4954 /* 4955 * L1's copy of L2's LPCR (vcpu->arch.vcore->lpcr) can get its MER bit 4956 * unexpectedly set - for e.g. during NMI handling when all register 4957 * states are synchronized from L0 to L1. L1 needs to inform L0 about 4958 * MER=1 only when there are pending external interrupts. 4959 * In the above if check, MER bit is set if there are pending 4960 * external interrupts. Hence, explicitly mask off MER bit 4961 * here as otherwise it may generate spurious interrupts in L2 KVM 4962 * causing an endless loop, which results in L2 guest getting hung. 4963 */ 4964 lpcr &= ~LPCR_MER; 4965 } 4966 } else if (vcpu->arch.pending_exceptions || 4967 xive_interrupt_pending(vcpu)) { 4968 vcpu->arch.ret = RESUME_HOST; 4969 goto out; 4970 } 4971 4972 if (vcpu->arch.timer_running) { 4973 hrtimer_try_to_cancel(&vcpu->arch.dec_timer); 4974 vcpu->arch.timer_running = 0; 4975 } 4976 4977 tb = mftb(); 4978 4979 kvmppc_update_vpa_dispatch_p9(vcpu, vc, tb + kvmppc_get_tb_offset(vcpu)); 4980 4981 trace_kvm_guest_enter(vcpu); 4982 4983 guest_timing_enter_irqoff(); 4984 4985 srcu_idx = srcu_read_lock(&kvm->srcu); 4986 4987 guest_state_enter_irqoff(); 4988 this_cpu_disable_ftrace(); 4989 4990 trap = kvmhv_p9_guest_entry(vcpu, time_limit, lpcr, &tb); 4991 vcpu->arch.trap = trap; 4992 4993 this_cpu_enable_ftrace(); 4994 guest_state_exit_irqoff(); 4995 4996 srcu_read_unlock(&kvm->srcu, srcu_idx); 4997 4998 set_irq_happened(trap); 4999 5000 vcpu->cpu = -1; 5001 vcpu->arch.thread_cpu = -1; 5002 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 5003 5004 if (!vtime_accounting_enabled_this_cpu()) { 5005 powerpc_local_irq_pmu_restore(flags); 5006 /* 5007 * Service IRQs here before guest_timing_exit_irqoff() so any 5008 * ticks that occurred while running the guest are accounted to 5009 * the guest. If vtime accounting is enabled, accounting uses 5010 * TB rather than ticks, so it can be done without enabling 5011 * interrupts here, which has the problem that it accounts 5012 * interrupt processing overhead to the host. 5013 */ 5014 powerpc_local_irq_pmu_save(flags); 5015 } 5016 guest_timing_exit_irqoff(); 5017 5018 powerpc_local_irq_pmu_restore(flags); 5019 5020 preempt_enable(); 5021 5022 /* 5023 * cancel pending decrementer exception if DEC is now positive, or if 5024 * entering a nested guest in which case the decrementer is now owned 5025 * by L2 and the L1 decrementer is provided in hdec_expires 5026 */ 5027 if (kvmppc_core_pending_dec(vcpu) && 5028 ((tb < kvmppc_dec_expires_host_tb(vcpu)) || 5029 (trap == BOOK3S_INTERRUPT_SYSCALL && 5030 kvmppc_get_gpr(vcpu, 3) == H_ENTER_NESTED))) 5031 kvmppc_core_dequeue_dec(vcpu); 5032 5033 trace_kvm_guest_exit(vcpu); 5034 r = RESUME_GUEST; 5035 if (trap) { 5036 if (!nested) 5037 r = kvmppc_handle_exit_hv(vcpu, current); 5038 else 5039 r = kvmppc_handle_nested_exit(vcpu); 5040 } 5041 vcpu->arch.ret = r; 5042 5043 if (is_kvmppc_resume_guest(r) && !kvmppc_vcpu_check_block(vcpu)) { 5044 kvmppc_set_timer(vcpu); 5045 5046 prepare_to_rcuwait(wait); 5047 for (;;) { 5048 set_current_state(TASK_INTERRUPTIBLE); 5049 if (signal_pending(current)) { 5050 vcpu->stat.signal_exits++; 5051 run->exit_reason = KVM_EXIT_INTR; 5052 vcpu->arch.ret = -EINTR; 5053 break; 5054 } 5055 5056 if (kvmppc_vcpu_check_block(vcpu)) 5057 break; 5058 5059 trace_kvmppc_vcore_blocked(vcpu, 0); 5060 schedule(); 5061 trace_kvmppc_vcore_blocked(vcpu, 1); 5062 } 5063 finish_rcuwait(wait); 5064 } 5065 vcpu->arch.ceded = 0; 5066 5067 done: 5068 trace_kvmppc_run_vcpu_exit(vcpu); 5069 5070 return vcpu->arch.ret; 5071 5072 sigpend: 5073 vcpu->stat.signal_exits++; 5074 run->exit_reason = KVM_EXIT_INTR; 5075 vcpu->arch.ret = -EINTR; 5076 out: 5077 vcpu->cpu = -1; 5078 vcpu->arch.thread_cpu = -1; 5079 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 5080 powerpc_local_irq_pmu_restore(flags); 5081 preempt_enable(); 5082 goto done; 5083} 5084 5085static int kvmppc_vcpu_run_hv(struct kvm_vcpu *vcpu) 5086{ 5087 struct kvm_run *run = vcpu->run; 5088 int r; 5089 int srcu_idx; 5090 struct kvm *kvm; 5091 unsigned long msr; 5092 5093 start_timing(vcpu, &vcpu->arch.vcpu_entry); 5094 5095 if (!vcpu->arch.sane) { 5096 run->exit_reason = KVM_EXIT_INTERNAL_ERROR; 5097 return -EINVAL; 5098 } 5099 5100 /* No need to go into the guest when all we'll do is come back out */ 5101 if (signal_pending(current)) { 5102 run->exit_reason = KVM_EXIT_INTR; 5103 return -EINTR; 5104 } 5105 5106#ifdef CONFIG_PPC_TRANSACTIONAL_MEM 5107 /* 5108 * Don't allow entry with a suspended transaction, because 5109 * the guest entry/exit code will lose it. 5110 */ 5111 if (cpu_has_feature(CPU_FTR_TM) && current->thread.regs && 5112 (current->thread.regs->msr & MSR_TM)) { 5113 if (MSR_TM_ACTIVE(current->thread.regs->msr)) { 5114 run->exit_reason = KVM_EXIT_FAIL_ENTRY; 5115 run->fail_entry.hardware_entry_failure_reason = 0; 5116 return -EINVAL; 5117 } 5118 } 5119#endif 5120 5121 /* 5122 * Force online to 1 for the sake of old userspace which doesn't 5123 * set it. 5124 */ 5125 if (!vcpu->arch.online) { 5126 atomic_inc(&vcpu->arch.vcore->online_count); 5127 vcpu->arch.online = 1; 5128 } 5129 5130 kvmppc_core_prepare_to_enter(vcpu); 5131 5132 kvm = vcpu->kvm; 5133 atomic_inc(&kvm->arch.vcpus_running); 5134 /* Order vcpus_running vs. mmu_ready, see kvmppc_alloc_reset_hpt */ 5135 smp_mb(); 5136 5137 msr = 0; 5138 if (IS_ENABLED(CONFIG_PPC_FPU)) 5139 msr |= MSR_FP; 5140 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 5141 msr |= MSR_VEC; 5142 if (cpu_has_feature(CPU_FTR_VSX)) 5143 msr |= MSR_VSX; 5144 if ((cpu_has_feature(CPU_FTR_TM) || 5145 cpu_has_feature(CPU_FTR_P9_TM_HV_ASSIST)) && 5146 (kvmppc_get_hfscr_hv(vcpu) & HFSCR_TM)) 5147 msr |= MSR_TM; 5148 msr = msr_check_and_set(msr); 5149 5150 kvmppc_save_user_regs(); 5151 5152 kvmppc_save_current_sprs(); 5153 5154 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5155 vcpu->arch.waitp = &vcpu->arch.vcore->wait; 5156 vcpu->arch.pgdir = kvm->mm->pgd; 5157 vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST; 5158 5159 do { 5160 accumulate_time(vcpu, &vcpu->arch.guest_entry); 5161 if (cpu_has_feature(CPU_FTR_ARCH_300)) 5162 r = kvmhv_run_single_vcpu(vcpu, ~(u64)0, 5163 vcpu->arch.vcore->lpcr); 5164 else 5165 r = kvmppc_run_vcpu(vcpu); 5166 5167 if (run->exit_reason == KVM_EXIT_PAPR_HCALL) { 5168 accumulate_time(vcpu, &vcpu->arch.hcall); 5169 5170 if (!kvmhv_is_nestedv2() && WARN_ON_ONCE(__kvmppc_get_msr_hv(vcpu) & MSR_PR)) { 5171 /* 5172 * These should have been caught reflected 5173 * into the guest by now. Final sanity check: 5174 * don't allow userspace to execute hcalls in 5175 * the hypervisor. 5176 */ 5177 r = RESUME_GUEST; 5178 continue; 5179 } 5180 trace_kvm_hcall_enter(vcpu); 5181 r = kvmppc_pseries_do_hcall(vcpu); 5182 trace_kvm_hcall_exit(vcpu, r); 5183 kvmppc_core_prepare_to_enter(vcpu); 5184 } else if (r == RESUME_PAGE_FAULT) { 5185 accumulate_time(vcpu, &vcpu->arch.pg_fault); 5186 srcu_idx = srcu_read_lock(&kvm->srcu); 5187 r = kvmppc_book3s_hv_page_fault(vcpu, 5188 vcpu->arch.fault_dar, vcpu->arch.fault_dsisr); 5189 srcu_read_unlock(&kvm->srcu, srcu_idx); 5190 } else if (r == RESUME_PASSTHROUGH) { 5191 if (WARN_ON(xics_on_xive())) 5192 r = H_SUCCESS; 5193 else 5194 r = kvmppc_xics_rm_complete(vcpu, 0); 5195 } 5196 } while (is_kvmppc_resume_guest(r)); 5197 accumulate_time(vcpu, &vcpu->arch.vcpu_exit); 5198 5199 vcpu->arch.state = KVMPPC_VCPU_NOTREADY; 5200 atomic_dec(&kvm->arch.vcpus_running); 5201 5202 srr_regs_clobbered(); 5203 5204 end_timing(vcpu); 5205 5206 return r; 5207} 5208 5209static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps, 5210 int shift, int sllp) 5211{ 5212 (*sps)->page_shift = shift; 5213 (*sps)->slb_enc = sllp; 5214 (*sps)->enc[0].page_shift = shift; 5215 (*sps)->enc[0].pte_enc = kvmppc_pgsize_lp_encoding(shift, shift); 5216 /* 5217 * Add 16MB MPSS support (may get filtered out by userspace) 5218 */ 5219 if (shift != 24) { 5220 int penc = kvmppc_pgsize_lp_encoding(shift, 24); 5221 if (penc != -1) { 5222 (*sps)->enc[1].page_shift = 24; 5223 (*sps)->enc[1].pte_enc = penc; 5224 } 5225 } 5226 (*sps)++; 5227} 5228 5229static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm, 5230 struct kvm_ppc_smmu_info *info) 5231{ 5232 struct kvm_ppc_one_seg_page_size *sps; 5233 5234 /* 5235 * POWER7, POWER8 and POWER9 all support 32 storage keys for data. 5236 * POWER7 doesn't support keys for instruction accesses, 5237 * POWER8 and POWER9 do. 5238 */ 5239 info->data_keys = 32; 5240 info->instr_keys = cpu_has_feature(CPU_FTR_ARCH_207S) ? 32 : 0; 5241 5242 /* POWER7, 8 and 9 all have 1T segments and 32-entry SLB */ 5243 info->flags = KVM_PPC_PAGE_SIZES_REAL | KVM_PPC_1T_SEGMENTS; 5244 info->slb_size = 32; 5245 5246 /* We only support these sizes for now, and no muti-size segments */ 5247 sps = &info->sps[0]; 5248 kvmppc_add_seg_page_size(&sps, 12, 0); 5249 kvmppc_add_seg_page_size(&sps, 16, SLB_VSID_L | SLB_VSID_LP_01); 5250 kvmppc_add_seg_page_size(&sps, 24, SLB_VSID_L); 5251 5252 /* If running as a nested hypervisor, we don't support HPT guests */ 5253 if (kvmhv_on_pseries()) 5254 info->flags |= KVM_PPC_NO_HASH; 5255 5256 return 0; 5257} 5258 5259/* 5260 * Get (and clear) the dirty memory log for a memory slot. 5261 */ 5262static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm, 5263 struct kvm_dirty_log *log) 5264{ 5265 struct kvm_memslots *slots; 5266 struct kvm_memory_slot *memslot; 5267 int r; 5268 unsigned long n, i; 5269 unsigned long *buf, *p; 5270 struct kvm_vcpu *vcpu; 5271 5272 mutex_lock(&kvm->slots_lock); 5273 5274 r = -EINVAL; 5275 if (log->slot >= KVM_USER_MEM_SLOTS) 5276 goto out; 5277 5278 slots = kvm_memslots(kvm); 5279 memslot = id_to_memslot(slots, log->slot); 5280 r = -ENOENT; 5281 if (!memslot || !memslot->dirty_bitmap) 5282 goto out; 5283 5284 /* 5285 * Use second half of bitmap area because both HPT and radix 5286 * accumulate bits in the first half. 5287 */ 5288 n = kvm_dirty_bitmap_bytes(memslot); 5289 buf = memslot->dirty_bitmap + n / sizeof(long); 5290 memset(buf, 0, n); 5291 5292 if (kvm_is_radix(kvm)) 5293 r = kvmppc_hv_get_dirty_log_radix(kvm, memslot, buf); 5294 else 5295 r = kvmppc_hv_get_dirty_log_hpt(kvm, memslot, buf); 5296 if (r) 5297 goto out; 5298 5299 /* 5300 * We accumulate dirty bits in the first half of the 5301 * memslot's dirty_bitmap area, for when pages are paged 5302 * out or modified by the host directly. Pick up these 5303 * bits and add them to the map. 5304 */ 5305 p = memslot->dirty_bitmap; 5306 for (i = 0; i < n / sizeof(long); ++i) 5307 buf[i] |= xchg(&p[i], 0); 5308 5309 /* Harvest dirty bits from VPA and DTL updates */ 5310 /* Note: we never modify the SLB shadow buffer areas */ 5311 kvm_for_each_vcpu(i, vcpu, kvm) { 5312 spin_lock(&vcpu->arch.vpa_update_lock); 5313 kvmppc_harvest_vpa_dirty(&vcpu->arch.vpa, memslot, buf); 5314 kvmppc_harvest_vpa_dirty(&vcpu->arch.dtl, memslot, buf); 5315 spin_unlock(&vcpu->arch.vpa_update_lock); 5316 } 5317 5318 r = -EFAULT; 5319 if (copy_to_user(log->dirty_bitmap, buf, n)) 5320 goto out; 5321 5322 r = 0; 5323out: 5324 mutex_unlock(&kvm->slots_lock); 5325 return r; 5326} 5327 5328static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *slot) 5329{ 5330 vfree(slot->arch.rmap); 5331 slot->arch.rmap = NULL; 5332} 5333 5334static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm, 5335 const struct kvm_memory_slot *old, 5336 struct kvm_memory_slot *new, 5337 enum kvm_mr_change change) 5338{ 5339 if (change == KVM_MR_CREATE) { 5340 unsigned long size = array_size(new->npages, sizeof(*new->arch.rmap)); 5341 5342 if ((size >> PAGE_SHIFT) > totalram_pages()) 5343 return -ENOMEM; 5344 5345 new->arch.rmap = vzalloc(size); 5346 if (!new->arch.rmap) 5347 return -ENOMEM; 5348 } else if (change != KVM_MR_DELETE) { 5349 new->arch.rmap = old->arch.rmap; 5350 } 5351 5352 return 0; 5353} 5354 5355static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm, 5356 struct kvm_memory_slot *old, 5357 const struct kvm_memory_slot *new, 5358 enum kvm_mr_change change) 5359{ 5360 /* 5361 * If we are creating or modifying a memslot, it might make 5362 * some address that was previously cached as emulated 5363 * MMIO be no longer emulated MMIO, so invalidate 5364 * all the caches of emulated MMIO translations. 5365 */ 5366 if (change != KVM_MR_DELETE) 5367 atomic64_inc(&kvm->arch.mmio_update); 5368 5369 /* 5370 * For change == KVM_MR_MOVE or KVM_MR_DELETE, higher levels 5371 * have already called kvm_arch_flush_shadow_memslot() to 5372 * flush shadow mappings. For KVM_MR_CREATE we have no 5373 * previous mappings. So the only case to handle is 5374 * KVM_MR_FLAGS_ONLY when the KVM_MEM_LOG_DIRTY_PAGES bit 5375 * has been changed. 5376 * For radix guests, we flush on setting KVM_MEM_LOG_DIRTY_PAGES 5377 * to get rid of any THP PTEs in the partition-scoped page tables 5378 * so we can track dirtiness at the page level; we flush when 5379 * clearing KVM_MEM_LOG_DIRTY_PAGES so that we can go back to 5380 * using THP PTEs. 5381 */ 5382 if (change == KVM_MR_FLAGS_ONLY && kvm_is_radix(kvm) && 5383 ((new->flags ^ old->flags) & KVM_MEM_LOG_DIRTY_PAGES)) 5384 kvmppc_radix_flush_memslot(kvm, old); 5385 /* 5386 * If UV hasn't yet called H_SVM_INIT_START, don't register memslots. 5387 */ 5388 if (!kvm->arch.secure_guest) 5389 return; 5390 5391 switch (change) { 5392 case KVM_MR_CREATE: 5393 /* 5394 * @TODO kvmppc_uvmem_memslot_create() can fail and 5395 * return error. Fix this. 5396 */ 5397 kvmppc_uvmem_memslot_create(kvm, new); 5398 break; 5399 case KVM_MR_DELETE: 5400 kvmppc_uvmem_memslot_delete(kvm, old); 5401 break; 5402 default: 5403 /* TODO: Handle KVM_MR_MOVE */ 5404 break; 5405 } 5406} 5407 5408/* 5409 * Update LPCR values in kvm->arch and in vcores. 5410 * Caller must hold kvm->arch.mmu_setup_lock (for mutual exclusion 5411 * of kvm->arch.lpcr update). 5412 */ 5413void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask) 5414{ 5415 long int i; 5416 u32 cores_done = 0; 5417 5418 if ((kvm->arch.lpcr & mask) == lpcr) 5419 return; 5420 5421 kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr; 5422 5423 for (i = 0; i < KVM_MAX_VCORES; ++i) { 5424 struct kvmppc_vcore *vc = kvm->arch.vcores[i]; 5425 if (!vc) 5426 continue; 5427 5428 spin_lock(&vc->lock); 5429 vc->lpcr = (vc->lpcr & ~mask) | lpcr; 5430 verify_lpcr(kvm, vc->lpcr); 5431 spin_unlock(&vc->lock); 5432 if (++cores_done >= kvm->arch.online_vcores) 5433 break; 5434 } 5435 5436 if (kvmhv_is_nestedv2()) { 5437 struct kvm_vcpu *vcpu; 5438 5439 kvm_for_each_vcpu(i, vcpu, kvm) { 5440 kvmhv_nestedv2_mark_dirty(vcpu, KVMPPC_GSID_LPCR); 5441 } 5442 } 5443} 5444 5445void kvmppc_setup_partition_table(struct kvm *kvm) 5446{ 5447 unsigned long dw0, dw1; 5448 5449 if (!kvm_is_radix(kvm)) { 5450 /* PS field - page size for VRMA */ 5451 dw0 = ((kvm->arch.vrma_slb_v & SLB_VSID_L) >> 1) | 5452 ((kvm->arch.vrma_slb_v & SLB_VSID_LP) << 1); 5453 /* HTABSIZE and HTABORG fields */ 5454 dw0 |= kvm->arch.sdr1; 5455 5456 /* Second dword as set by userspace */ 5457 dw1 = kvm->arch.process_table; 5458 } else { 5459 dw0 = PATB_HR | radix__get_tree_size() | 5460 __pa(kvm->arch.pgtable) | RADIX_PGD_INDEX_SIZE; 5461 dw1 = PATB_GR | kvm->arch.process_table; 5462 } 5463 kvmhv_set_ptbl_entry(kvm->arch.lpid, dw0, dw1); 5464} 5465 5466/* 5467 * Set up HPT (hashed page table) and RMA (real-mode area). 5468 * Must be called with kvm->arch.mmu_setup_lock held. 5469 */ 5470static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu) 5471{ 5472 int err = 0; 5473 struct kvm *kvm = vcpu->kvm; 5474 unsigned long hva; 5475 struct kvm_memory_slot *memslot; 5476 struct vm_area_struct *vma; 5477 unsigned long lpcr = 0, senc; 5478 unsigned long psize, porder; 5479 int srcu_idx; 5480 5481 /* Allocate hashed page table (if not done already) and reset it */ 5482 if (!kvm->arch.hpt.virt) { 5483 int order = KVM_DEFAULT_HPT_ORDER; 5484 struct kvm_hpt_info info; 5485 5486 err = kvmppc_allocate_hpt(&info, order); 5487 /* If we get here, it means userspace didn't specify a 5488 * size explicitly. So, try successively smaller 5489 * sizes if the default failed. */ 5490 while ((err == -ENOMEM) && --order >= PPC_MIN_HPT_ORDER) 5491 err = kvmppc_allocate_hpt(&info, order); 5492 5493 if (err < 0) { 5494 pr_err("KVM: Couldn't alloc HPT\n"); 5495 goto out; 5496 } 5497 5498 kvmppc_set_hpt(kvm, &info); 5499 } 5500 5501 /* Look up the memslot for guest physical address 0 */ 5502 srcu_idx = srcu_read_lock(&kvm->srcu); 5503 memslot = gfn_to_memslot(kvm, 0); 5504 5505 /* We must have some memory at 0 by now */ 5506 err = -EINVAL; 5507 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) 5508 goto out_srcu; 5509 5510 /* Look up the VMA for the start of this memory slot */ 5511 hva = memslot->userspace_addr; 5512 mmap_read_lock(kvm->mm); 5513 vma = vma_lookup(kvm->mm, hva); 5514 if (!vma || (vma->vm_flags & VM_IO)) 5515 goto up_out; 5516 5517 psize = vma_kernel_pagesize(vma); 5518 5519 mmap_read_unlock(kvm->mm); 5520 5521 /* We can handle 4k, 64k or 16M pages in the VRMA */ 5522 if (psize >= 0x1000000) 5523 psize = 0x1000000; 5524 else if (psize >= 0x10000) 5525 psize = 0x10000; 5526 else 5527 psize = 0x1000; 5528 porder = __ilog2(psize); 5529 5530 senc = slb_pgsize_encoding(psize); 5531 kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T | 5532 (VRMA_VSID << SLB_VSID_SHIFT_1T); 5533 /* Create HPTEs in the hash page table for the VRMA */ 5534 kvmppc_map_vrma(vcpu, memslot, porder); 5535 5536 /* Update VRMASD field in the LPCR */ 5537 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 5538 /* the -4 is to account for senc values starting at 0x10 */ 5539 lpcr = senc << (LPCR_VRMASD_SH - 4); 5540 kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD); 5541 } 5542 5543 /* Order updates to kvm->arch.lpcr etc. vs. mmu_ready */ 5544 smp_wmb(); 5545 err = 0; 5546 out_srcu: 5547 srcu_read_unlock(&kvm->srcu, srcu_idx); 5548 out: 5549 return err; 5550 5551 up_out: 5552 mmap_read_unlock(kvm->mm); 5553 goto out_srcu; 5554} 5555 5556/* 5557 * Must be called with kvm->arch.mmu_setup_lock held and 5558 * mmu_ready = 0 and no vcpus running. 5559 */ 5560int kvmppc_switch_mmu_to_hpt(struct kvm *kvm) 5561{ 5562 unsigned long lpcr, lpcr_mask; 5563 5564 if (nesting_enabled(kvm)) 5565 kvmhv_release_all_nested(kvm); 5566 kvmppc_rmap_reset(kvm); 5567 kvm->arch.process_table = 0; 5568 /* Mutual exclusion with kvm_unmap_gfn_range etc. */ 5569 spin_lock(&kvm->mmu_lock); 5570 kvm->arch.radix = 0; 5571 spin_unlock(&kvm->mmu_lock); 5572 kvmppc_free_radix(kvm); 5573 5574 lpcr = LPCR_VPM1; 5575 lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5576 if (cpu_has_feature(CPU_FTR_ARCH_31)) 5577 lpcr_mask |= LPCR_HAIL; 5578 kvmppc_update_lpcr(kvm, lpcr, lpcr_mask); 5579 5580 return 0; 5581} 5582 5583/* 5584 * Must be called with kvm->arch.mmu_setup_lock held and 5585 * mmu_ready = 0 and no vcpus running. 5586 */ 5587int kvmppc_switch_mmu_to_radix(struct kvm *kvm) 5588{ 5589 unsigned long lpcr, lpcr_mask; 5590 int err; 5591 5592 err = kvmppc_init_vm_radix(kvm); 5593 if (err) 5594 return err; 5595 kvmppc_rmap_reset(kvm); 5596 /* Mutual exclusion with kvm_unmap_gfn_range etc. */ 5597 spin_lock(&kvm->mmu_lock); 5598 kvm->arch.radix = 1; 5599 spin_unlock(&kvm->mmu_lock); 5600 kvmppc_free_hpt(&kvm->arch.hpt); 5601 5602 lpcr = LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5603 lpcr_mask = LPCR_VPM1 | LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5604 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 5605 lpcr_mask |= LPCR_HAIL; 5606 if (cpu_has_feature(CPU_FTR_HVMODE) && 5607 (kvm->arch.host_lpcr & LPCR_HAIL)) 5608 lpcr |= LPCR_HAIL; 5609 } 5610 kvmppc_update_lpcr(kvm, lpcr, lpcr_mask); 5611 5612 return 0; 5613} 5614 5615#ifdef CONFIG_KVM_XICS 5616/* 5617 * Allocate a per-core structure for managing state about which cores are 5618 * running in the host versus the guest and for exchanging data between 5619 * real mode KVM and CPU running in the host. 5620 * This is only done for the first VM. 5621 * The allocated structure stays even if all VMs have stopped. 5622 * It is only freed when the kvm-hv module is unloaded. 5623 * It's OK for this routine to fail, we just don't support host 5624 * core operations like redirecting H_IPI wakeups. 5625 */ 5626void kvmppc_alloc_host_rm_ops(void) 5627{ 5628 struct kvmppc_host_rm_ops *ops; 5629 unsigned long l_ops; 5630 int cpu, core; 5631 int size; 5632 5633 if (cpu_has_feature(CPU_FTR_ARCH_300)) 5634 return; 5635 5636 /* Not the first time here ? */ 5637 if (kvmppc_host_rm_ops_hv != NULL) 5638 return; 5639 5640 ops = kzalloc(sizeof(struct kvmppc_host_rm_ops), GFP_KERNEL); 5641 if (!ops) 5642 return; 5643 5644 size = cpu_nr_cores() * sizeof(struct kvmppc_host_rm_core); 5645 ops->rm_core = kzalloc(size, GFP_KERNEL); 5646 5647 if (!ops->rm_core) { 5648 kfree(ops); 5649 return; 5650 } 5651 5652 cpus_read_lock(); 5653 5654 for (cpu = 0; cpu < nr_cpu_ids; cpu += threads_per_core) { 5655 if (!cpu_online(cpu)) 5656 continue; 5657 5658 core = cpu >> threads_shift; 5659 ops->rm_core[core].rm_state.in_host = 1; 5660 } 5661 5662 ops->vcpu_kick = kvmppc_fast_vcpu_kick_hv; 5663 5664 /* 5665 * Make the contents of the kvmppc_host_rm_ops structure visible 5666 * to other CPUs before we assign it to the global variable. 5667 * Do an atomic assignment (no locks used here), but if someone 5668 * beats us to it, just free our copy and return. 5669 */ 5670 smp_wmb(); 5671 l_ops = (unsigned long) ops; 5672 5673 if (cmpxchg64((unsigned long *)&kvmppc_host_rm_ops_hv, 0, l_ops)) { 5674 cpus_read_unlock(); 5675 kfree(ops->rm_core); 5676 kfree(ops); 5677 return; 5678 } 5679 5680 cpuhp_setup_state_nocalls_cpuslocked(CPUHP_KVM_PPC_BOOK3S_PREPARE, 5681 "ppc/kvm_book3s:prepare", 5682 kvmppc_set_host_core, 5683 kvmppc_clear_host_core); 5684 cpus_read_unlock(); 5685} 5686 5687void kvmppc_free_host_rm_ops(void) 5688{ 5689 if (kvmppc_host_rm_ops_hv) { 5690 cpuhp_remove_state_nocalls(CPUHP_KVM_PPC_BOOK3S_PREPARE); 5691 kfree(kvmppc_host_rm_ops_hv->rm_core); 5692 kfree(kvmppc_host_rm_ops_hv); 5693 kvmppc_host_rm_ops_hv = NULL; 5694 } 5695} 5696#endif 5697 5698static int kvmppc_core_init_vm_hv(struct kvm *kvm) 5699{ 5700 unsigned long lpcr, lpid; 5701 int ret; 5702 5703 mutex_init(&kvm->arch.uvmem_lock); 5704 INIT_LIST_HEAD(&kvm->arch.uvmem_pfns); 5705 mutex_init(&kvm->arch.mmu_setup_lock); 5706 5707 /* Allocate the guest's logical partition ID */ 5708 5709 if (!kvmhv_is_nestedv2()) { 5710 lpid = kvmppc_alloc_lpid(); 5711 if ((long)lpid < 0) 5712 return -ENOMEM; 5713 kvm->arch.lpid = lpid; 5714 } 5715 5716 kvmppc_alloc_host_rm_ops(); 5717 5718 kvmhv_vm_nested_init(kvm); 5719 5720 if (kvmhv_is_nestedv2()) { 5721 long rc; 5722 unsigned long guest_id; 5723 5724 rc = plpar_guest_create(0, &guest_id); 5725 5726 if (rc != H_SUCCESS) 5727 pr_err("KVM: Create Guest hcall failed, rc=%ld\n", rc); 5728 5729 switch (rc) { 5730 case H_PARAMETER: 5731 case H_FUNCTION: 5732 case H_STATE: 5733 return -EINVAL; 5734 case H_NOT_ENOUGH_RESOURCES: 5735 case H_ABORTED: 5736 return -ENOMEM; 5737 case H_AUTHORITY: 5738 return -EPERM; 5739 case H_NOT_AVAILABLE: 5740 return -EBUSY; 5741 } 5742 kvm->arch.lpid = guest_id; 5743 } 5744 5745 5746 /* 5747 * Since we don't flush the TLB when tearing down a VM, 5748 * and this lpid might have previously been used, 5749 * make sure we flush on each core before running the new VM. 5750 * On POWER9, the tlbie in mmu_partition_table_set_entry() 5751 * does this flush for us. 5752 */ 5753 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5754 cpumask_setall(&kvm->arch.need_tlb_flush); 5755 5756 /* Start out with the default set of hcalls enabled */ 5757 memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls, 5758 sizeof(kvm->arch.enabled_hcalls)); 5759 5760 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5761 kvm->arch.host_sdr1 = mfspr(SPRN_SDR1); 5762 5763 /* Init LPCR for virtual RMA mode */ 5764 if (cpu_has_feature(CPU_FTR_HVMODE)) { 5765 kvm->arch.host_lpid = mfspr(SPRN_LPID); 5766 kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR); 5767 lpcr &= LPCR_PECE | LPCR_LPES; 5768 } else { 5769 /* 5770 * The L2 LPES mode will be set by the L0 according to whether 5771 * or not it needs to take external interrupts in HV mode. 5772 */ 5773 lpcr = 0; 5774 } 5775 lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE | 5776 LPCR_VPM0 | LPCR_VPM1; 5777 kvm->arch.vrma_slb_v = SLB_VSID_B_1T | 5778 (VRMA_VSID << SLB_VSID_SHIFT_1T); 5779 /* On POWER8 turn on online bit to enable PURR/SPURR */ 5780 if (cpu_has_feature(CPU_FTR_ARCH_207S)) 5781 lpcr |= LPCR_ONL; 5782 /* 5783 * On POWER9, VPM0 bit is reserved (VPM0=1 behaviour is assumed) 5784 * Set HVICE bit to enable hypervisor virtualization interrupts. 5785 * Set HEIC to prevent OS interrupts to go to hypervisor (should 5786 * be unnecessary but better safe than sorry in case we re-enable 5787 * EE in HV mode with this LPCR still set) 5788 */ 5789 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 5790 lpcr &= ~LPCR_VPM0; 5791 lpcr |= LPCR_HVICE | LPCR_HEIC; 5792 5793 /* 5794 * If xive is enabled, we route 0x500 interrupts directly 5795 * to the guest. 5796 */ 5797 if (xics_on_xive()) 5798 lpcr |= LPCR_LPES; 5799 } 5800 5801 /* 5802 * If the host uses radix, the guest starts out as radix. 5803 */ 5804 if (radix_enabled()) { 5805 kvm->arch.radix = 1; 5806 kvm->arch.mmu_ready = 1; 5807 lpcr &= ~LPCR_VPM1; 5808 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR; 5809 if (cpu_has_feature(CPU_FTR_HVMODE) && 5810 cpu_has_feature(CPU_FTR_ARCH_31) && 5811 (kvm->arch.host_lpcr & LPCR_HAIL)) 5812 lpcr |= LPCR_HAIL; 5813 ret = kvmppc_init_vm_radix(kvm); 5814 if (ret) { 5815 if (kvmhv_is_nestedv2()) 5816 plpar_guest_delete(0, kvm->arch.lpid); 5817 else 5818 kvmppc_free_lpid(kvm->arch.lpid); 5819 return ret; 5820 } 5821 kvmppc_setup_partition_table(kvm); 5822 } 5823 5824 verify_lpcr(kvm, lpcr); 5825 kvm->arch.lpcr = lpcr; 5826 5827 /* Initialization for future HPT resizes */ 5828 kvm->arch.resize_hpt = NULL; 5829 5830 /* 5831 * Work out how many sets the TLB has, for the use of 5832 * the TLB invalidation loop in book3s_hv_rmhandlers.S. 5833 */ 5834 if (cpu_has_feature(CPU_FTR_ARCH_31)) { 5835 /* 5836 * P10 will flush all the congruence class with a single tlbiel 5837 */ 5838 kvm->arch.tlb_sets = 1; 5839 } else if (radix_enabled()) 5840 kvm->arch.tlb_sets = POWER9_TLB_SETS_RADIX; /* 128 */ 5841 else if (cpu_has_feature(CPU_FTR_ARCH_300)) 5842 kvm->arch.tlb_sets = POWER9_TLB_SETS_HASH; /* 256 */ 5843 else if (cpu_has_feature(CPU_FTR_ARCH_207S)) 5844 kvm->arch.tlb_sets = POWER8_TLB_SETS; /* 512 */ 5845 else 5846 kvm->arch.tlb_sets = POWER7_TLB_SETS; /* 128 */ 5847 5848 /* 5849 * Track that we now have a HV mode VM active. This blocks secondary 5850 * CPU threads from coming online. 5851 */ 5852 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5853 kvm_hv_vm_activated(); 5854 5855 /* 5856 * Initialize smt_mode depending on processor. 5857 * POWER8 and earlier have to use "strict" threading, where 5858 * all vCPUs in a vcore have to run on the same (sub)core, 5859 * whereas on POWER9 the threads can each run a different 5860 * guest. 5861 */ 5862 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5863 kvm->arch.smt_mode = threads_per_subcore; 5864 else 5865 kvm->arch.smt_mode = 1; 5866 kvm->arch.emul_smt_mode = 1; 5867 5868 return 0; 5869} 5870 5871static int kvmppc_arch_create_vm_debugfs_hv(struct kvm *kvm) 5872{ 5873 kvmppc_mmu_debugfs_init(kvm); 5874 if (radix_enabled()) 5875 kvmhv_radix_debugfs_init(kvm); 5876 return 0; 5877} 5878 5879static void kvmppc_free_vcores(struct kvm *kvm) 5880{ 5881 long int i; 5882 5883 for (i = 0; i < KVM_MAX_VCORES; ++i) 5884 kfree(kvm->arch.vcores[i]); 5885 kvm->arch.online_vcores = 0; 5886} 5887 5888static void kvmppc_core_destroy_vm_hv(struct kvm *kvm) 5889{ 5890 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 5891 kvm_hv_vm_deactivated(); 5892 5893 kvmppc_free_vcores(kvm); 5894 5895 5896 if (kvm_is_radix(kvm)) 5897 kvmppc_free_radix(kvm); 5898 else 5899 kvmppc_free_hpt(&kvm->arch.hpt); 5900 5901 /* Perform global invalidation and return lpid to the pool */ 5902 if (cpu_has_feature(CPU_FTR_ARCH_300)) { 5903 if (nesting_enabled(kvm)) 5904 kvmhv_release_all_nested(kvm); 5905 kvm->arch.process_table = 0; 5906 if (kvm->arch.secure_guest) 5907 uv_svm_terminate(kvm->arch.lpid); 5908 if (!kvmhv_is_nestedv2()) 5909 kvmhv_set_ptbl_entry(kvm->arch.lpid, 0, 0); 5910 } 5911 5912 if (kvmhv_is_nestedv2()) { 5913 kvmhv_flush_lpid(kvm->arch.lpid); 5914 plpar_guest_delete(0, kvm->arch.lpid); 5915 } else { 5916 kvmppc_free_lpid(kvm->arch.lpid); 5917 } 5918 5919 kvmppc_free_pimap(kvm); 5920} 5921 5922/* We don't need to emulate any privileged instructions or dcbz */ 5923static int kvmppc_core_emulate_op_hv(struct kvm_vcpu *vcpu, 5924 unsigned int inst, int *advance) 5925{ 5926 return EMULATE_FAIL; 5927} 5928 5929static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn, 5930 ulong spr_val) 5931{ 5932 return EMULATE_FAIL; 5933} 5934 5935static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn, 5936 ulong *spr_val) 5937{ 5938 return EMULATE_FAIL; 5939} 5940 5941static int kvmppc_core_check_processor_compat_hv(void) 5942{ 5943 if (cpu_has_feature(CPU_FTR_HVMODE) && 5944 cpu_has_feature(CPU_FTR_ARCH_206)) 5945 return 0; 5946 5947 /* POWER9 in radix mode is capable of being a nested hypervisor. */ 5948 if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled()) 5949 return 0; 5950 5951 return -EIO; 5952} 5953 5954#ifdef CONFIG_KVM_XICS 5955 5956void kvmppc_free_pimap(struct kvm *kvm) 5957{ 5958 kfree(kvm->arch.pimap); 5959} 5960 5961static struct kvmppc_passthru_irqmap *kvmppc_alloc_pimap(void) 5962{ 5963 return kzalloc(sizeof(struct kvmppc_passthru_irqmap), GFP_KERNEL); 5964} 5965 5966static int kvmppc_set_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 5967{ 5968 struct irq_desc *desc; 5969 struct kvmppc_irq_map *irq_map; 5970 struct kvmppc_passthru_irqmap *pimap; 5971 struct irq_chip *chip; 5972 int i, rc = 0; 5973 struct irq_data *host_data; 5974 5975 if (!kvm_irq_bypass) 5976 return 1; 5977 5978 desc = irq_to_desc(host_irq); 5979 if (!desc) 5980 return -EIO; 5981 5982 mutex_lock(&kvm->lock); 5983 5984 pimap = kvm->arch.pimap; 5985 if (pimap == NULL) { 5986 /* First call, allocate structure to hold IRQ map */ 5987 pimap = kvmppc_alloc_pimap(); 5988 if (pimap == NULL) { 5989 mutex_unlock(&kvm->lock); 5990 return -ENOMEM; 5991 } 5992 kvm->arch.pimap = pimap; 5993 } 5994 5995 /* 5996 * For now, we only support interrupts for which the EOI operation 5997 * is an OPAL call followed by a write to XIRR, since that's 5998 * what our real-mode EOI code does, or a XIVE interrupt 5999 */ 6000 chip = irq_data_get_irq_chip(&desc->irq_data); 6001 if (!chip || !is_pnv_opal_msi(chip)) { 6002 pr_warn("kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (%d,%d)\n", 6003 host_irq, guest_gsi); 6004 mutex_unlock(&kvm->lock); 6005 return -ENOENT; 6006 } 6007 6008 /* 6009 * See if we already have an entry for this guest IRQ number. 6010 * If it's mapped to a hardware IRQ number, that's an error, 6011 * otherwise re-use this entry. 6012 */ 6013 for (i = 0; i < pimap->n_mapped; i++) { 6014 if (guest_gsi == pimap->mapped[i].v_hwirq) { 6015 if (pimap->mapped[i].r_hwirq) { 6016 mutex_unlock(&kvm->lock); 6017 return -EINVAL; 6018 } 6019 break; 6020 } 6021 } 6022 6023 if (i == KVMPPC_PIRQ_MAPPED) { 6024 mutex_unlock(&kvm->lock); 6025 return -EAGAIN; /* table is full */ 6026 } 6027 6028 irq_map = &pimap->mapped[i]; 6029 6030 irq_map->v_hwirq = guest_gsi; 6031 irq_map->desc = desc; 6032 6033 /* 6034 * Order the above two stores before the next to serialize with 6035 * the KVM real mode handler. 6036 */ 6037 smp_wmb(); 6038 6039 /* 6040 * The 'host_irq' number is mapped in the PCI-MSI domain but 6041 * the underlying calls, which will EOI the interrupt in real 6042 * mode, need an HW IRQ number mapped in the XICS IRQ domain. 6043 */ 6044 host_data = irq_domain_get_irq_data(irq_get_default_domain(), host_irq); 6045 irq_map->r_hwirq = (unsigned int)irqd_to_hwirq(host_data); 6046 6047 if (i == pimap->n_mapped) 6048 pimap->n_mapped++; 6049 6050 if (xics_on_xive()) 6051 rc = kvmppc_xive_set_mapped(kvm, guest_gsi, host_irq); 6052 else 6053 kvmppc_xics_set_mapped(kvm, guest_gsi, irq_map->r_hwirq); 6054 if (rc) 6055 irq_map->r_hwirq = 0; 6056 6057 mutex_unlock(&kvm->lock); 6058 6059 return 0; 6060} 6061 6062static int kvmppc_clr_passthru_irq(struct kvm *kvm, int host_irq, int guest_gsi) 6063{ 6064 struct irq_desc *desc; 6065 struct kvmppc_passthru_irqmap *pimap; 6066 int i, rc = 0; 6067 6068 if (!kvm_irq_bypass) 6069 return 0; 6070 6071 desc = irq_to_desc(host_irq); 6072 if (!desc) 6073 return -EIO; 6074 6075 mutex_lock(&kvm->lock); 6076 if (!kvm->arch.pimap) 6077 goto unlock; 6078 6079 pimap = kvm->arch.pimap; 6080 6081 for (i = 0; i < pimap->n_mapped; i++) { 6082 if (guest_gsi == pimap->mapped[i].v_hwirq) 6083 break; 6084 } 6085 6086 if (i == pimap->n_mapped) { 6087 mutex_unlock(&kvm->lock); 6088 return -ENODEV; 6089 } 6090 6091 if (xics_on_xive()) 6092 rc = kvmppc_xive_clr_mapped(kvm, guest_gsi, host_irq); 6093 else 6094 kvmppc_xics_clr_mapped(kvm, guest_gsi, pimap->mapped[i].r_hwirq); 6095 6096 /* invalidate the entry (what to do on error from the above ?) */ 6097 pimap->mapped[i].r_hwirq = 0; 6098 6099 /* 6100 * We don't free this structure even when the count goes to 6101 * zero. The structure is freed when we destroy the VM. 6102 */ 6103 unlock: 6104 mutex_unlock(&kvm->lock); 6105 return rc; 6106} 6107 6108static int kvmppc_irq_bypass_add_producer_hv(struct irq_bypass_consumer *cons, 6109 struct irq_bypass_producer *prod) 6110{ 6111 int ret = 0; 6112 struct kvm_kernel_irqfd *irqfd = 6113 container_of(cons, struct kvm_kernel_irqfd, consumer); 6114 6115 irqfd->producer = prod; 6116 6117 ret = kvmppc_set_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 6118 if (ret) 6119 pr_info("kvmppc_set_passthru_irq (irq %d, gsi %d) fails: %d\n", 6120 prod->irq, irqfd->gsi, ret); 6121 6122 return ret; 6123} 6124 6125static void kvmppc_irq_bypass_del_producer_hv(struct irq_bypass_consumer *cons, 6126 struct irq_bypass_producer *prod) 6127{ 6128 int ret; 6129 struct kvm_kernel_irqfd *irqfd = 6130 container_of(cons, struct kvm_kernel_irqfd, consumer); 6131 6132 irqfd->producer = NULL; 6133 6134 /* 6135 * When producer of consumer is unregistered, we change back to 6136 * default external interrupt handling mode - KVM real mode 6137 * will switch back to host. 6138 */ 6139 ret = kvmppc_clr_passthru_irq(irqfd->kvm, prod->irq, irqfd->gsi); 6140 if (ret) 6141 pr_warn("kvmppc_clr_passthru_irq (irq %d, gsi %d) fails: %d\n", 6142 prod->irq, irqfd->gsi, ret); 6143} 6144#endif 6145 6146static int kvm_arch_vm_ioctl_hv(struct file *filp, 6147 unsigned int ioctl, unsigned long arg) 6148{ 6149 struct kvm *kvm __maybe_unused = filp->private_data; 6150 void __user *argp = (void __user *)arg; 6151 int r; 6152 6153 switch (ioctl) { 6154 6155 case KVM_PPC_ALLOCATE_HTAB: { 6156 u32 htab_order; 6157 6158 /* If we're a nested hypervisor, we currently only support radix */ 6159 if (kvmhv_on_pseries()) { 6160 r = -EOPNOTSUPP; 6161 break; 6162 } 6163 6164 r = -EFAULT; 6165 if (get_user(htab_order, (u32 __user *)argp)) 6166 break; 6167 r = kvmppc_alloc_reset_hpt(kvm, htab_order); 6168 if (r) 6169 break; 6170 r = 0; 6171 break; 6172 } 6173 6174 case KVM_PPC_GET_HTAB_FD: { 6175 struct kvm_get_htab_fd ghf; 6176 6177 r = -EFAULT; 6178 if (copy_from_user(&ghf, argp, sizeof(ghf))) 6179 break; 6180 r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf); 6181 break; 6182 } 6183 6184 case KVM_PPC_RESIZE_HPT_PREPARE: { 6185 struct kvm_ppc_resize_hpt rhpt; 6186 6187 r = -EFAULT; 6188 if (copy_from_user(&rhpt, argp, sizeof(rhpt))) 6189 break; 6190 6191 r = kvm_vm_ioctl_resize_hpt_prepare(kvm, &rhpt); 6192 break; 6193 } 6194 6195 case KVM_PPC_RESIZE_HPT_COMMIT: { 6196 struct kvm_ppc_resize_hpt rhpt; 6197 6198 r = -EFAULT; 6199 if (copy_from_user(&rhpt, argp, sizeof(rhpt))) 6200 break; 6201 6202 r = kvm_vm_ioctl_resize_hpt_commit(kvm, &rhpt); 6203 break; 6204 } 6205 6206 default: 6207 r = -ENOTTY; 6208 } 6209 6210 return r; 6211} 6212 6213/* 6214 * List of hcall numbers to enable by default. 6215 * For compatibility with old userspace, we enable by default 6216 * all hcalls that were implemented before the hcall-enabling 6217 * facility was added. Note this list should not include H_RTAS. 6218 */ 6219static unsigned int default_hcall_list[] = { 6220 H_REMOVE, 6221 H_ENTER, 6222 H_READ, 6223 H_PROTECT, 6224 H_BULK_REMOVE, 6225#ifdef CONFIG_SPAPR_TCE_IOMMU 6226 H_GET_TCE, 6227 H_PUT_TCE, 6228#endif 6229 H_SET_DABR, 6230 H_SET_XDABR, 6231 H_CEDE, 6232 H_PROD, 6233 H_CONFER, 6234 H_REGISTER_VPA, 6235#ifdef CONFIG_KVM_XICS 6236 H_EOI, 6237 H_CPPR, 6238 H_IPI, 6239 H_IPOLL, 6240 H_XIRR, 6241 H_XIRR_X, 6242#endif 6243 0 6244}; 6245 6246static void init_default_hcalls(void) 6247{ 6248 int i; 6249 unsigned int hcall; 6250 6251 for (i = 0; default_hcall_list[i]; ++i) { 6252 hcall = default_hcall_list[i]; 6253 WARN_ON(!kvmppc_hcall_impl_hv(hcall)); 6254 __set_bit(hcall / 4, default_enabled_hcalls); 6255 } 6256} 6257 6258static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg) 6259{ 6260 unsigned long lpcr; 6261 int radix; 6262 int err; 6263 6264 /* If not on a POWER9, reject it */ 6265 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 6266 return -ENODEV; 6267 6268 /* If any unknown flags set, reject it */ 6269 if (cfg->flags & ~(KVM_PPC_MMUV3_RADIX | KVM_PPC_MMUV3_GTSE)) 6270 return -EINVAL; 6271 6272 /* GR (guest radix) bit in process_table field must match */ 6273 radix = !!(cfg->flags & KVM_PPC_MMUV3_RADIX); 6274 if (!!(cfg->process_table & PATB_GR) != radix) 6275 return -EINVAL; 6276 6277 /* Process table size field must be reasonable, i.e. <= 24 */ 6278 if ((cfg->process_table & PRTS_MASK) > 24) 6279 return -EINVAL; 6280 6281 /* We can change a guest to/from radix now, if the host is radix */ 6282 if (radix && !radix_enabled()) 6283 return -EINVAL; 6284 6285 /* If we're a nested hypervisor, we currently only support radix */ 6286 if (kvmhv_on_pseries() && !radix) 6287 return -EINVAL; 6288 6289 mutex_lock(&kvm->arch.mmu_setup_lock); 6290 if (radix != kvm_is_radix(kvm)) { 6291 if (kvm->arch.mmu_ready) { 6292 kvm->arch.mmu_ready = 0; 6293 /* order mmu_ready vs. vcpus_running */ 6294 smp_mb(); 6295 if (atomic_read(&kvm->arch.vcpus_running)) { 6296 kvm->arch.mmu_ready = 1; 6297 err = -EBUSY; 6298 goto out_unlock; 6299 } 6300 } 6301 if (radix) 6302 err = kvmppc_switch_mmu_to_radix(kvm); 6303 else 6304 err = kvmppc_switch_mmu_to_hpt(kvm); 6305 if (err) 6306 goto out_unlock; 6307 } 6308 6309 kvm->arch.process_table = cfg->process_table; 6310 kvmppc_setup_partition_table(kvm); 6311 6312 lpcr = (cfg->flags & KVM_PPC_MMUV3_GTSE) ? LPCR_GTSE : 0; 6313 kvmppc_update_lpcr(kvm, lpcr, LPCR_GTSE); 6314 err = 0; 6315 6316 out_unlock: 6317 mutex_unlock(&kvm->arch.mmu_setup_lock); 6318 return err; 6319} 6320 6321static int kvmhv_enable_nested(struct kvm *kvm) 6322{ 6323 if (!nested) 6324 return -EPERM; 6325 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 6326 return -ENODEV; 6327 if (!radix_enabled()) 6328 return -ENODEV; 6329 if (kvmhv_is_nestedv2()) 6330 return -ENODEV; 6331 6332 /* kvm == NULL means the caller is testing if the capability exists */ 6333 if (kvm) 6334 kvm->arch.nested_enable = true; 6335 return 0; 6336} 6337 6338static int kvmhv_load_from_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, 6339 int size) 6340{ 6341 int rc = -EINVAL; 6342 6343 if (kvmhv_vcpu_is_radix(vcpu)) { 6344 rc = kvmhv_copy_from_guest_radix(vcpu, *eaddr, ptr, size); 6345 6346 if (rc > 0) 6347 rc = -EINVAL; 6348 } 6349 6350 /* For now quadrants are the only way to access nested guest memory */ 6351 if (rc && vcpu->arch.nested) 6352 rc = -EAGAIN; 6353 6354 return rc; 6355} 6356 6357static int kvmhv_store_to_eaddr(struct kvm_vcpu *vcpu, ulong *eaddr, void *ptr, 6358 int size) 6359{ 6360 int rc = -EINVAL; 6361 6362 if (kvmhv_vcpu_is_radix(vcpu)) { 6363 rc = kvmhv_copy_to_guest_radix(vcpu, *eaddr, ptr, size); 6364 6365 if (rc > 0) 6366 rc = -EINVAL; 6367 } 6368 6369 /* For now quadrants are the only way to access nested guest memory */ 6370 if (rc && vcpu->arch.nested) 6371 rc = -EAGAIN; 6372 6373 return rc; 6374} 6375 6376static void unpin_vpa_reset(struct kvm *kvm, struct kvmppc_vpa *vpa) 6377{ 6378 unpin_vpa(kvm, vpa); 6379 vpa->gpa = 0; 6380 vpa->pinned_addr = NULL; 6381 vpa->dirty = false; 6382 vpa->update_pending = 0; 6383} 6384 6385/* 6386 * Enable a guest to become a secure VM, or test whether 6387 * that could be enabled. 6388 * Called when the KVM_CAP_PPC_SECURE_GUEST capability is 6389 * tested (kvm == NULL) or enabled (kvm != NULL). 6390 */ 6391static int kvmhv_enable_svm(struct kvm *kvm) 6392{ 6393 if (!kvmppc_uvmem_available()) 6394 return -EINVAL; 6395 if (kvm) 6396 kvm->arch.svm_enabled = 1; 6397 return 0; 6398} 6399 6400/* 6401 * IOCTL handler to turn off secure mode of guest 6402 * 6403 * - Release all device pages 6404 * - Issue ucall to terminate the guest on the UV side 6405 * - Unpin the VPA pages. 6406 * - Reinit the partition scoped page tables 6407 */ 6408static int kvmhv_svm_off(struct kvm *kvm) 6409{ 6410 struct kvm_vcpu *vcpu; 6411 int mmu_was_ready; 6412 int srcu_idx; 6413 int ret = 0; 6414 unsigned long i; 6415 6416 if (!(kvm->arch.secure_guest & KVMPPC_SECURE_INIT_START)) 6417 return ret; 6418 6419 mutex_lock(&kvm->arch.mmu_setup_lock); 6420 mmu_was_ready = kvm->arch.mmu_ready; 6421 if (kvm->arch.mmu_ready) { 6422 kvm->arch.mmu_ready = 0; 6423 /* order mmu_ready vs. vcpus_running */ 6424 smp_mb(); 6425 if (atomic_read(&kvm->arch.vcpus_running)) { 6426 kvm->arch.mmu_ready = 1; 6427 ret = -EBUSY; 6428 goto out; 6429 } 6430 } 6431 6432 srcu_idx = srcu_read_lock(&kvm->srcu); 6433 for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) { 6434 struct kvm_memory_slot *memslot; 6435 struct kvm_memslots *slots = __kvm_memslots(kvm, i); 6436 int bkt; 6437 6438 if (!slots) 6439 continue; 6440 6441 kvm_for_each_memslot(memslot, bkt, slots) { 6442 kvmppc_uvmem_drop_pages(memslot, kvm, true); 6443 uv_unregister_mem_slot(kvm->arch.lpid, memslot->id); 6444 } 6445 } 6446 srcu_read_unlock(&kvm->srcu, srcu_idx); 6447 6448 ret = uv_svm_terminate(kvm->arch.lpid); 6449 if (ret != U_SUCCESS) { 6450 ret = -EINVAL; 6451 goto out; 6452 } 6453 6454 /* 6455 * When secure guest is reset, all the guest pages are sent 6456 * to UV via UV_PAGE_IN before the non-boot vcpus get a 6457 * chance to run and unpin their VPA pages. Unpinning of all 6458 * VPA pages is done here explicitly so that VPA pages 6459 * can be migrated to the secure side. 6460 * 6461 * This is required to for the secure SMP guest to reboot 6462 * correctly. 6463 */ 6464 kvm_for_each_vcpu(i, vcpu, kvm) { 6465 spin_lock(&vcpu->arch.vpa_update_lock); 6466 unpin_vpa_reset(kvm, &vcpu->arch.dtl); 6467 unpin_vpa_reset(kvm, &vcpu->arch.slb_shadow); 6468 unpin_vpa_reset(kvm, &vcpu->arch.vpa); 6469 spin_unlock(&vcpu->arch.vpa_update_lock); 6470 } 6471 6472 kvmppc_setup_partition_table(kvm); 6473 kvm->arch.secure_guest = 0; 6474 kvm->arch.mmu_ready = mmu_was_ready; 6475out: 6476 mutex_unlock(&kvm->arch.mmu_setup_lock); 6477 return ret; 6478} 6479 6480static int kvmhv_enable_dawr1(struct kvm *kvm) 6481{ 6482 if (!cpu_has_feature(CPU_FTR_DAWR1)) 6483 return -ENODEV; 6484 6485 /* kvm == NULL means the caller is testing if the capability exists */ 6486 if (kvm) 6487 kvm->arch.dawr1_enabled = true; 6488 return 0; 6489} 6490 6491static bool kvmppc_hash_v3_possible(void) 6492{ 6493 if (!cpu_has_feature(CPU_FTR_ARCH_300)) 6494 return false; 6495 6496 if (!cpu_has_feature(CPU_FTR_HVMODE)) 6497 return false; 6498 6499 /* 6500 * POWER9 chips before version 2.02 can't have some threads in 6501 * HPT mode and some in radix mode on the same core. 6502 */ 6503 if (radix_enabled()) { 6504 unsigned int pvr = mfspr(SPRN_PVR); 6505 if ((pvr >> 16) == PVR_POWER9 && 6506 (((pvr & 0xe000) == 0 && (pvr & 0xfff) < 0x202) || 6507 ((pvr & 0xe000) == 0x2000 && (pvr & 0xfff) < 0x101))) 6508 return false; 6509 } 6510 6511 return true; 6512} 6513 6514static struct kvmppc_ops kvm_ops_hv = { 6515 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv, 6516 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv, 6517 .get_one_reg = kvmppc_get_one_reg_hv, 6518 .set_one_reg = kvmppc_set_one_reg_hv, 6519 .vcpu_load = kvmppc_core_vcpu_load_hv, 6520 .vcpu_put = kvmppc_core_vcpu_put_hv, 6521 .inject_interrupt = kvmppc_inject_interrupt_hv, 6522 .set_msr = kvmppc_set_msr_hv, 6523 .vcpu_run = kvmppc_vcpu_run_hv, 6524 .vcpu_create = kvmppc_core_vcpu_create_hv, 6525 .vcpu_free = kvmppc_core_vcpu_free_hv, 6526 .check_requests = kvmppc_core_check_requests_hv, 6527 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_hv, 6528 .flush_memslot = kvmppc_core_flush_memslot_hv, 6529 .prepare_memory_region = kvmppc_core_prepare_memory_region_hv, 6530 .commit_memory_region = kvmppc_core_commit_memory_region_hv, 6531 .unmap_gfn_range = kvm_unmap_gfn_range_hv, 6532 .age_gfn = kvm_age_gfn_hv, 6533 .test_age_gfn = kvm_test_age_gfn_hv, 6534 .free_memslot = kvmppc_core_free_memslot_hv, 6535 .init_vm = kvmppc_core_init_vm_hv, 6536 .destroy_vm = kvmppc_core_destroy_vm_hv, 6537 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv, 6538 .emulate_op = kvmppc_core_emulate_op_hv, 6539 .emulate_mtspr = kvmppc_core_emulate_mtspr_hv, 6540 .emulate_mfspr = kvmppc_core_emulate_mfspr_hv, 6541 .fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv, 6542 .arch_vm_ioctl = kvm_arch_vm_ioctl_hv, 6543 .hcall_implemented = kvmppc_hcall_impl_hv, 6544 .configure_mmu = kvmhv_configure_mmu, 6545 .get_rmmu_info = kvmhv_get_rmmu_info, 6546 .set_smt_mode = kvmhv_set_smt_mode, 6547 .enable_nested = kvmhv_enable_nested, 6548 .load_from_eaddr = kvmhv_load_from_eaddr, 6549 .store_to_eaddr = kvmhv_store_to_eaddr, 6550 .enable_svm = kvmhv_enable_svm, 6551 .svm_off = kvmhv_svm_off, 6552 .enable_dawr1 = kvmhv_enable_dawr1, 6553 .hash_v3_possible = kvmppc_hash_v3_possible, 6554 .create_vcpu_debugfs = kvmppc_arch_create_vcpu_debugfs_hv, 6555 .create_vm_debugfs = kvmppc_arch_create_vm_debugfs_hv, 6556}; 6557 6558static int kvm_init_subcore_bitmap(void) 6559{ 6560 int i, j; 6561 int nr_cores = cpu_nr_cores(); 6562 struct sibling_subcore_state *sibling_subcore_state; 6563 6564 for (i = 0; i < nr_cores; i++) { 6565 int first_cpu = i * threads_per_core; 6566 int node = cpu_to_node(first_cpu); 6567 6568 /* Ignore if it is already allocated. */ 6569 if (paca_ptrs[first_cpu]->sibling_subcore_state) 6570 continue; 6571 6572 sibling_subcore_state = 6573 kzalloc_node(sizeof(struct sibling_subcore_state), 6574 GFP_KERNEL, node); 6575 if (!sibling_subcore_state) 6576 return -ENOMEM; 6577 6578 6579 for (j = 0; j < threads_per_core; j++) { 6580 int cpu = first_cpu + j; 6581 6582 paca_ptrs[cpu]->sibling_subcore_state = 6583 sibling_subcore_state; 6584 } 6585 } 6586 return 0; 6587} 6588 6589static int kvmppc_radix_possible(void) 6590{ 6591 return cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled(); 6592} 6593 6594static int kvmppc_book3s_init_hv(void) 6595{ 6596 int r; 6597 6598 if (!tlbie_capable) { 6599 pr_err("KVM-HV: Host does not support TLBIE\n"); 6600 return -ENODEV; 6601 } 6602 6603 /* 6604 * FIXME!! Do we need to check on all cpus ? 6605 */ 6606 r = kvmppc_core_check_processor_compat_hv(); 6607 if (r < 0) 6608 return -ENODEV; 6609 6610 r = kvmhv_nested_init(); 6611 if (r) 6612 return r; 6613 6614 if (!cpu_has_feature(CPU_FTR_ARCH_300)) { 6615 r = kvm_init_subcore_bitmap(); 6616 if (r) 6617 goto err; 6618 } 6619 6620 /* 6621 * We need a way of accessing the XICS interrupt controller, 6622 * either directly, via paca_ptrs[cpu]->kvm_hstate.xics_phys, or 6623 * indirectly, via OPAL. 6624 */ 6625#ifdef CONFIG_SMP 6626 if (!xics_on_xive() && !kvmhv_on_pseries() && 6627 !local_paca->kvm_hstate.xics_phys) { 6628 struct device_node *np; 6629 6630 np = of_find_compatible_node(NULL, NULL, "ibm,opal-intc"); 6631 if (!np) { 6632 pr_err("KVM-HV: Cannot determine method for accessing XICS\n"); 6633 r = -ENODEV; 6634 goto err; 6635 } 6636 /* presence of intc confirmed - node can be dropped again */ 6637 of_node_put(np); 6638 } 6639#endif 6640 6641 init_default_hcalls(); 6642 6643 init_vcore_lists(); 6644 6645 r = kvmppc_mmu_hv_init(); 6646 if (r) 6647 goto err; 6648 6649 if (kvmppc_radix_possible()) { 6650 r = kvmppc_radix_init(); 6651 if (r) 6652 goto err; 6653 } 6654 6655 r = kvmppc_uvmem_init(); 6656 if (r < 0) { 6657 pr_err("KVM-HV: kvmppc_uvmem_init failed %d\n", r); 6658 return r; 6659 } 6660 6661#if defined(CONFIG_KVM_XICS) 6662 /* 6663 * IRQ bypass is supported only for interrupts whose EOI operations are 6664 * handled via OPAL calls. Therefore, register IRQ bypass handlers 6665 * exclusively for PowerNV KVM when booted with 'xive=off', indicating 6666 * the use of the emulated XICS interrupt controller. 6667 */ 6668 if (!kvmhv_on_pseries()) { 6669 pr_info("KVM-HV: Enabling IRQ bypass\n"); 6670 kvm_ops_hv.irq_bypass_add_producer = 6671 kvmppc_irq_bypass_add_producer_hv; 6672 kvm_ops_hv.irq_bypass_del_producer = 6673 kvmppc_irq_bypass_del_producer_hv; 6674 } 6675#endif 6676 6677 kvm_ops_hv.owner = THIS_MODULE; 6678 kvmppc_hv_ops = &kvm_ops_hv; 6679 6680 return 0; 6681 6682err: 6683 kvmhv_nested_exit(); 6684 kvmppc_radix_exit(); 6685 6686 return r; 6687} 6688 6689static void kvmppc_book3s_exit_hv(void) 6690{ 6691 kvmppc_uvmem_free(); 6692 kvmppc_free_host_rm_ops(); 6693 if (kvmppc_radix_possible()) 6694 kvmppc_radix_exit(); 6695 kvmppc_hv_ops = NULL; 6696 kvmhv_nested_exit(); 6697} 6698 6699module_init(kvmppc_book3s_init_hv); 6700module_exit(kvmppc_book3s_exit_hv); 6701MODULE_DESCRIPTION("KVM on Book3S (POWER8 and later) in hypervisor mode"); 6702MODULE_LICENSE("GPL"); 6703MODULE_ALIAS_MISCDEV(KVM_MINOR); 6704MODULE_ALIAS("devname:kvm");
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