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kvm-s390.c
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linux-6.19.14/arch/s390/kvm/kvm-s390.c
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * hosting IBM Z kernel virtual machines (s390x) 4 * 5 * Copyright IBM Corp. 2008, 2020 6 * 7 * Author(s): Carsten Otte <cotte@de.ibm.com> 8 * Christian Borntraeger <borntraeger@de.ibm.com> 9 * Christian Ehrhardt <ehrhardt@de.ibm.com> 10 * Jason J. Herne <jjherne@us.ibm.com> 11 */ 12 13#define pr_fmt(fmt) "kvm-s390: " fmt 14 15#include <linux/compiler.h> 16#include <linux/entry-virt.h> 17#include <linux/export.h> 18#include <linux/err.h> 19#include <linux/fs.h> 20#include <linux/hrtimer.h> 21#include <linux/init.h> 22#include <linux/kvm.h> 23#include <linux/kvm_host.h> 24#include <linux/mman.h> 25#include <linux/module.h> 26#include <linux/moduleparam.h> 27#include <linux/cpufeature.h> 28#include <linux/random.h> 29#include <linux/slab.h> 30#include <linux/timer.h> 31#include <linux/vmalloc.h> 32#include <linux/bitmap.h> 33#include <linux/sched/signal.h> 34#include <linux/string.h> 35#include <linux/pgtable.h> 36#include <linux/mmu_notifier.h> 37 38#include <asm/access-regs.h> 39#include <asm/asm-offsets.h> 40#include <asm/lowcore.h> 41#include <asm/machine.h> 42#include <asm/stp.h> 43#include <asm/gmap.h> 44#include <asm/gmap_helpers.h> 45#include <asm/nmi.h> 46#include <asm/isc.h> 47#include <asm/sclp.h> 48#include <asm/cpacf.h> 49#include <asm/timex.h> 50#include <asm/asm.h> 51#include <asm/fpu.h> 52#include <asm/ap.h> 53#include <asm/uv.h> 54#include "kvm-s390.h" 55#include "gaccess.h" 56#include "pci.h" 57 58#define CREATE_TRACE_POINTS 59#include "trace.h" 60#include "trace-s390.h" 61 62#define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */ 63#define LOCAL_IRQS 32 64#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \ 65 (KVM_MAX_VCPUS + LOCAL_IRQS)) 66 67const struct kvm_stats_desc kvm_vm_stats_desc[] = { 68 KVM_GENERIC_VM_STATS(), 69 STATS_DESC_COUNTER(VM, inject_io), 70 STATS_DESC_COUNTER(VM, inject_float_mchk), 71 STATS_DESC_COUNTER(VM, inject_pfault_done), 72 STATS_DESC_COUNTER(VM, inject_service_signal), 73 STATS_DESC_COUNTER(VM, inject_virtio), 74 STATS_DESC_COUNTER(VM, aen_forward), 75 STATS_DESC_COUNTER(VM, gmap_shadow_reuse), 76 STATS_DESC_COUNTER(VM, gmap_shadow_create), 77 STATS_DESC_COUNTER(VM, gmap_shadow_r1_entry), 78 STATS_DESC_COUNTER(VM, gmap_shadow_r2_entry), 79 STATS_DESC_COUNTER(VM, gmap_shadow_r3_entry), 80 STATS_DESC_COUNTER(VM, gmap_shadow_sg_entry), 81 STATS_DESC_COUNTER(VM, gmap_shadow_pg_entry), 82}; 83 84const struct kvm_stats_header kvm_vm_stats_header = { 85 .name_size = KVM_STATS_NAME_SIZE, 86 .num_desc = ARRAY_SIZE(kvm_vm_stats_desc), 87 .id_offset = sizeof(struct kvm_stats_header), 88 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, 89 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + 90 sizeof(kvm_vm_stats_desc), 91}; 92 93const struct kvm_stats_desc kvm_vcpu_stats_desc[] = { 94 KVM_GENERIC_VCPU_STATS(), 95 STATS_DESC_COUNTER(VCPU, exit_userspace), 96 STATS_DESC_COUNTER(VCPU, exit_null), 97 STATS_DESC_COUNTER(VCPU, exit_external_request), 98 STATS_DESC_COUNTER(VCPU, exit_io_request), 99 STATS_DESC_COUNTER(VCPU, exit_external_interrupt), 100 STATS_DESC_COUNTER(VCPU, exit_stop_request), 101 STATS_DESC_COUNTER(VCPU, exit_validity), 102 STATS_DESC_COUNTER(VCPU, exit_instruction), 103 STATS_DESC_COUNTER(VCPU, exit_pei), 104 STATS_DESC_COUNTER(VCPU, halt_no_poll_steal), 105 STATS_DESC_COUNTER(VCPU, instruction_lctl), 106 STATS_DESC_COUNTER(VCPU, instruction_lctlg), 107 STATS_DESC_COUNTER(VCPU, instruction_stctl), 108 STATS_DESC_COUNTER(VCPU, instruction_stctg), 109 STATS_DESC_COUNTER(VCPU, exit_program_interruption), 110 STATS_DESC_COUNTER(VCPU, exit_instr_and_program), 111 STATS_DESC_COUNTER(VCPU, exit_operation_exception), 112 STATS_DESC_COUNTER(VCPU, deliver_ckc), 113 STATS_DESC_COUNTER(VCPU, deliver_cputm), 114 STATS_DESC_COUNTER(VCPU, deliver_external_call), 115 STATS_DESC_COUNTER(VCPU, deliver_emergency_signal), 116 STATS_DESC_COUNTER(VCPU, deliver_service_signal), 117 STATS_DESC_COUNTER(VCPU, deliver_virtio), 118 STATS_DESC_COUNTER(VCPU, deliver_stop_signal), 119 STATS_DESC_COUNTER(VCPU, deliver_prefix_signal), 120 STATS_DESC_COUNTER(VCPU, deliver_restart_signal), 121 STATS_DESC_COUNTER(VCPU, deliver_program), 122 STATS_DESC_COUNTER(VCPU, deliver_io), 123 STATS_DESC_COUNTER(VCPU, deliver_machine_check), 124 STATS_DESC_COUNTER(VCPU, exit_wait_state), 125 STATS_DESC_COUNTER(VCPU, inject_ckc), 126 STATS_DESC_COUNTER(VCPU, inject_cputm), 127 STATS_DESC_COUNTER(VCPU, inject_external_call), 128 STATS_DESC_COUNTER(VCPU, inject_emergency_signal), 129 STATS_DESC_COUNTER(VCPU, inject_mchk), 130 STATS_DESC_COUNTER(VCPU, inject_pfault_init), 131 STATS_DESC_COUNTER(VCPU, inject_program), 132 STATS_DESC_COUNTER(VCPU, inject_restart), 133 STATS_DESC_COUNTER(VCPU, inject_set_prefix), 134 STATS_DESC_COUNTER(VCPU, inject_stop_signal), 135 STATS_DESC_COUNTER(VCPU, instruction_epsw), 136 STATS_DESC_COUNTER(VCPU, instruction_gs), 137 STATS_DESC_COUNTER(VCPU, instruction_io_other), 138 STATS_DESC_COUNTER(VCPU, instruction_lpsw), 139 STATS_DESC_COUNTER(VCPU, instruction_lpswe), 140 STATS_DESC_COUNTER(VCPU, instruction_lpswey), 141 STATS_DESC_COUNTER(VCPU, instruction_pfmf), 142 STATS_DESC_COUNTER(VCPU, instruction_ptff), 143 STATS_DESC_COUNTER(VCPU, instruction_sck), 144 STATS_DESC_COUNTER(VCPU, instruction_sckpf), 145 STATS_DESC_COUNTER(VCPU, instruction_stidp), 146 STATS_DESC_COUNTER(VCPU, instruction_spx), 147 STATS_DESC_COUNTER(VCPU, instruction_stpx), 148 STATS_DESC_COUNTER(VCPU, instruction_stap), 149 STATS_DESC_COUNTER(VCPU, instruction_iske), 150 STATS_DESC_COUNTER(VCPU, instruction_ri), 151 STATS_DESC_COUNTER(VCPU, instruction_rrbe), 152 STATS_DESC_COUNTER(VCPU, instruction_sske), 153 STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock), 154 STATS_DESC_COUNTER(VCPU, instruction_stsi), 155 STATS_DESC_COUNTER(VCPU, instruction_stfl), 156 STATS_DESC_COUNTER(VCPU, instruction_tb), 157 STATS_DESC_COUNTER(VCPU, instruction_tpi), 158 STATS_DESC_COUNTER(VCPU, instruction_tprot), 159 STATS_DESC_COUNTER(VCPU, instruction_tsch), 160 STATS_DESC_COUNTER(VCPU, instruction_sie), 161 STATS_DESC_COUNTER(VCPU, instruction_essa), 162 STATS_DESC_COUNTER(VCPU, instruction_sthyi), 163 STATS_DESC_COUNTER(VCPU, instruction_sigp_sense), 164 STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running), 165 STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call), 166 STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency), 167 STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency), 168 STATS_DESC_COUNTER(VCPU, instruction_sigp_start), 169 STATS_DESC_COUNTER(VCPU, instruction_sigp_stop), 170 STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status), 171 STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status), 172 STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status), 173 STATS_DESC_COUNTER(VCPU, instruction_sigp_arch), 174 STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix), 175 STATS_DESC_COUNTER(VCPU, instruction_sigp_restart), 176 STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset), 177 STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset), 178 STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown), 179 STATS_DESC_COUNTER(VCPU, instruction_diagnose_10), 180 STATS_DESC_COUNTER(VCPU, instruction_diagnose_44), 181 STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c), 182 STATS_DESC_COUNTER(VCPU, diag_9c_ignored), 183 STATS_DESC_COUNTER(VCPU, diag_9c_forward), 184 STATS_DESC_COUNTER(VCPU, instruction_diagnose_258), 185 STATS_DESC_COUNTER(VCPU, instruction_diagnose_308), 186 STATS_DESC_COUNTER(VCPU, instruction_diagnose_500), 187 STATS_DESC_COUNTER(VCPU, instruction_diagnose_other), 188 STATS_DESC_COUNTER(VCPU, pfault_sync), 189 STATS_DESC_COUNTER(VCPU, signal_exits) 190}; 191 192const struct kvm_stats_header kvm_vcpu_stats_header = { 193 .name_size = KVM_STATS_NAME_SIZE, 194 .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc), 195 .id_offset = sizeof(struct kvm_stats_header), 196 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE, 197 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE + 198 sizeof(kvm_vcpu_stats_desc), 199}; 200 201/* allow nested virtualization in KVM (if enabled by user space) */ 202static int nested; 203module_param(nested, int, S_IRUGO); 204MODULE_PARM_DESC(nested, "Nested virtualization support"); 205 206/* allow 1m huge page guest backing, if !nested */ 207static int hpage; 208module_param(hpage, int, 0444); 209MODULE_PARM_DESC(hpage, "1m huge page backing support"); 210 211/* maximum percentage of steal time for polling. >100 is treated like 100 */ 212static u8 halt_poll_max_steal = 10; 213module_param(halt_poll_max_steal, byte, 0644); 214MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling"); 215 216/* if set to true, the GISA will be initialized and used if available */ 217static bool use_gisa = true; 218module_param(use_gisa, bool, 0644); 219MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it."); 220 221/* maximum diag9c forwarding per second */ 222unsigned int diag9c_forwarding_hz; 223module_param(diag9c_forwarding_hz, uint, 0644); 224MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off"); 225 226/* 227 * allow asynchronous deinit for protected guests; enable by default since 228 * the feature is opt-in anyway 229 */ 230static int async_destroy = 1; 231module_param(async_destroy, int, 0444); 232MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests"); 233 234/* 235 * For now we handle at most 16 double words as this is what the s390 base 236 * kernel handles and stores in the prefix page. If we ever need to go beyond 237 * this, this requires changes to code, but the external uapi can stay. 238 */ 239#define SIZE_INTERNAL 16 240 241/* 242 * Base feature mask that defines default mask for facilities. Consists of the 243 * defines in FACILITIES_KVM and the non-hypervisor managed bits. 244 */ 245static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM }; 246/* 247 * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL 248 * and defines the facilities that can be enabled via a cpu model. 249 */ 250static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL }; 251 252static unsigned long kvm_s390_fac_size(void) 253{ 254 BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64); 255 BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64); 256 BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) > 257 sizeof(stfle_fac_list)); 258 259 return SIZE_INTERNAL; 260} 261 262/* available cpu features supported by kvm */ 263static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 264/* available subfunctions indicated via query / "test bit" */ 265static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc; 266 267static struct gmap_notifier gmap_notifier; 268static struct gmap_notifier vsie_gmap_notifier; 269debug_info_t *kvm_s390_dbf; 270debug_info_t *kvm_s390_dbf_uv; 271 272/* Section: not file related */ 273/* forward declarations */ 274static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, 275 unsigned long end); 276 277static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta) 278{ 279 u8 delta_idx = 0; 280 281 /* 282 * The TOD jumps by delta, we have to compensate this by adding 283 * -delta to the epoch. 284 */ 285 delta = -delta; 286 287 /* sign-extension - we're adding to signed values below */ 288 if ((s64)delta < 0) 289 delta_idx = -1; 290 291 scb->epoch += delta; 292 if (scb->ecd & ECD_MEF) { 293 scb->epdx += delta_idx; 294 if (scb->epoch < delta) 295 scb->epdx += 1; 296 } 297} 298 299/* 300 * This callback is executed during stop_machine(). All CPUs are therefore 301 * temporarily stopped. In order not to change guest behavior, we have to 302 * disable preemption whenever we touch the epoch of kvm and the VCPUs, 303 * so a CPU won't be stopped while calculating with the epoch. 304 */ 305static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val, 306 void *v) 307{ 308 struct kvm *kvm; 309 struct kvm_vcpu *vcpu; 310 unsigned long i; 311 unsigned long long *delta = v; 312 313 list_for_each_entry(kvm, &vm_list, vm_list) { 314 kvm_for_each_vcpu(i, vcpu, kvm) { 315 kvm_clock_sync_scb(vcpu->arch.sie_block, *delta); 316 if (i == 0) { 317 kvm->arch.epoch = vcpu->arch.sie_block->epoch; 318 kvm->arch.epdx = vcpu->arch.sie_block->epdx; 319 } 320 if (vcpu->arch.cputm_enabled) 321 vcpu->arch.cputm_start += *delta; 322 if (vcpu->arch.vsie_block) 323 kvm_clock_sync_scb(vcpu->arch.vsie_block, 324 *delta); 325 } 326 } 327 return NOTIFY_OK; 328} 329 330static struct notifier_block kvm_clock_notifier = { 331 .notifier_call = kvm_clock_sync, 332}; 333 334static void allow_cpu_feat(unsigned long nr) 335{ 336 set_bit_inv(nr, kvm_s390_available_cpu_feat); 337} 338 339static inline int plo_test_bit(unsigned char nr) 340{ 341 unsigned long function = (unsigned long)nr | 0x100; 342 int cc; 343 344 asm volatile( 345 " lgr 0,%[function]\n" 346 /* Parameter registers are ignored for "test bit" */ 347 " plo 0,0,0,0(0)\n" 348 CC_IPM(cc) 349 : CC_OUT(cc, cc) 350 : [function] "d" (function) 351 : CC_CLOBBER_LIST("0")); 352 return CC_TRANSFORM(cc) == 0; 353} 354 355static __always_inline void pfcr_query(u8 (*query)[16]) 356{ 357 asm volatile( 358 " lghi 0,0\n" 359 " .insn rsy,0xeb0000000016,0,0,%[query]" 360 : [query] "=QS" (*query) 361 : 362 : "cc", "0"); 363} 364 365static __always_inline void __sortl_query(u8 (*query)[32]) 366{ 367 asm volatile( 368 " lghi 0,0\n" 369 " la 1,%[query]\n" 370 /* Parameter registers are ignored */ 371 " .insn rre,0xb9380000,2,4" 372 : [query] "=R" (*query) 373 : 374 : "cc", "0", "1"); 375} 376 377static __always_inline void __dfltcc_query(u8 (*query)[32]) 378{ 379 asm volatile( 380 " lghi 0,0\n" 381 " la 1,%[query]\n" 382 /* Parameter registers are ignored */ 383 " .insn rrf,0xb9390000,2,4,6,0" 384 : [query] "=R" (*query) 385 : 386 : "cc", "0", "1"); 387} 388 389static void __init kvm_s390_cpu_feat_init(void) 390{ 391 int i; 392 393 for (i = 0; i < 256; ++i) { 394 if (plo_test_bit(i)) 395 kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7); 396 } 397 398 if (test_facility(28)) /* TOD-clock steering */ 399 ptff(kvm_s390_available_subfunc.ptff, 400 sizeof(kvm_s390_available_subfunc.ptff), 401 PTFF_QAF); 402 403 if (test_facility(17)) { /* MSA */ 404 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *) 405 kvm_s390_available_subfunc.kmac); 406 __cpacf_query(CPACF_KMC, (cpacf_mask_t *) 407 kvm_s390_available_subfunc.kmc); 408 __cpacf_query(CPACF_KM, (cpacf_mask_t *) 409 kvm_s390_available_subfunc.km); 410 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *) 411 kvm_s390_available_subfunc.kimd); 412 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *) 413 kvm_s390_available_subfunc.klmd); 414 } 415 if (test_facility(76)) /* MSA3 */ 416 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *) 417 kvm_s390_available_subfunc.pckmo); 418 if (test_facility(77)) { /* MSA4 */ 419 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *) 420 kvm_s390_available_subfunc.kmctr); 421 __cpacf_query(CPACF_KMF, (cpacf_mask_t *) 422 kvm_s390_available_subfunc.kmf); 423 __cpacf_query(CPACF_KMO, (cpacf_mask_t *) 424 kvm_s390_available_subfunc.kmo); 425 __cpacf_query(CPACF_PCC, (cpacf_mask_t *) 426 kvm_s390_available_subfunc.pcc); 427 } 428 if (test_facility(57)) /* MSA5 */ 429 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *) 430 kvm_s390_available_subfunc.ppno); 431 432 if (test_facility(146)) /* MSA8 */ 433 __cpacf_query(CPACF_KMA, (cpacf_mask_t *) 434 kvm_s390_available_subfunc.kma); 435 436 if (test_facility(155)) /* MSA9 */ 437 __cpacf_query(CPACF_KDSA, (cpacf_mask_t *) 438 kvm_s390_available_subfunc.kdsa); 439 440 if (test_facility(150)) /* SORTL */ 441 __sortl_query(&kvm_s390_available_subfunc.sortl); 442 443 if (test_facility(151)) /* DFLTCC */ 444 __dfltcc_query(&kvm_s390_available_subfunc.dfltcc); 445 446 if (test_facility(201)) /* PFCR */ 447 pfcr_query(&kvm_s390_available_subfunc.pfcr); 448 449 if (machine_has_esop()) 450 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP); 451 /* 452 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow), 453 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing). 454 */ 455 if (!sclp.has_sief2 || !machine_has_esop() || !sclp.has_64bscao || 456 !test_facility(3) || !nested) 457 return; 458 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2); 459 if (sclp.has_64bscao) 460 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO); 461 if (sclp.has_siif) 462 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF); 463 if (sclp.has_gpere) 464 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE); 465 if (sclp.has_gsls) 466 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS); 467 if (sclp.has_ib) 468 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB); 469 if (sclp.has_cei) 470 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI); 471 if (sclp.has_ibs) 472 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS); 473 if (sclp.has_kss) 474 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS); 475 /* 476 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make 477 * all skey handling functions read/set the skey from the PGSTE 478 * instead of the real storage key. 479 * 480 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make 481 * pages being detected as preserved although they are resident. 482 * 483 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will 484 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY. 485 * 486 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and 487 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be 488 * correctly shadowed. We can do that for the PGSTE but not for PTE.I. 489 * 490 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We 491 * cannot easily shadow the SCA because of the ipte lock. 492 */ 493} 494 495static int __init __kvm_s390_init(void) 496{ 497 int rc = -ENOMEM; 498 499 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long)); 500 if (!kvm_s390_dbf) 501 return -ENOMEM; 502 503 kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long)); 504 if (!kvm_s390_dbf_uv) 505 goto err_kvm_uv; 506 507 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) || 508 debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view)) 509 goto err_debug_view; 510 511 kvm_s390_cpu_feat_init(); 512 513 /* Register floating interrupt controller interface. */ 514 rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC); 515 if (rc) { 516 pr_err("A FLIC registration call failed with rc=%d\n", rc); 517 goto err_flic; 518 } 519 520 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) { 521 rc = kvm_s390_pci_init(); 522 if (rc) { 523 pr_err("Unable to allocate AIFT for PCI\n"); 524 goto err_pci; 525 } 526 } 527 528 rc = kvm_s390_gib_init(GAL_ISC); 529 if (rc) 530 goto err_gib; 531 532 gmap_notifier.notifier_call = kvm_gmap_notifier; 533 gmap_register_pte_notifier(&gmap_notifier); 534 vsie_gmap_notifier.notifier_call = kvm_s390_vsie_gmap_notifier; 535 gmap_register_pte_notifier(&vsie_gmap_notifier); 536 atomic_notifier_chain_register(&s390_epoch_delta_notifier, 537 &kvm_clock_notifier); 538 539 return 0; 540 541err_gib: 542 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 543 kvm_s390_pci_exit(); 544err_pci: 545err_flic: 546err_debug_view: 547 debug_unregister(kvm_s390_dbf_uv); 548err_kvm_uv: 549 debug_unregister(kvm_s390_dbf); 550 return rc; 551} 552 553static void __kvm_s390_exit(void) 554{ 555 gmap_unregister_pte_notifier(&gmap_notifier); 556 gmap_unregister_pte_notifier(&vsie_gmap_notifier); 557 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier, 558 &kvm_clock_notifier); 559 560 kvm_s390_gib_destroy(); 561 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 562 kvm_s390_pci_exit(); 563 debug_unregister(kvm_s390_dbf); 564 debug_unregister(kvm_s390_dbf_uv); 565} 566 567/* Section: device related */ 568long kvm_arch_dev_ioctl(struct file *filp, 569 unsigned int ioctl, unsigned long arg) 570{ 571 if (ioctl == KVM_S390_ENABLE_SIE) 572 return s390_enable_sie(); 573 return -EINVAL; 574} 575 576int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 577{ 578 int r; 579 580 switch (ext) { 581 case KVM_CAP_S390_PSW: 582 case KVM_CAP_S390_GMAP: 583 case KVM_CAP_SYNC_MMU: 584#ifdef CONFIG_KVM_S390_UCONTROL 585 case KVM_CAP_S390_UCONTROL: 586#endif 587 case KVM_CAP_ASYNC_PF: 588 case KVM_CAP_SYNC_REGS: 589 case KVM_CAP_ONE_REG: 590 case KVM_CAP_ENABLE_CAP: 591 case KVM_CAP_S390_CSS_SUPPORT: 592 case KVM_CAP_IOEVENTFD: 593 case KVM_CAP_S390_IRQCHIP: 594 case KVM_CAP_VM_ATTRIBUTES: 595 case KVM_CAP_MP_STATE: 596 case KVM_CAP_IMMEDIATE_EXIT: 597 case KVM_CAP_S390_INJECT_IRQ: 598 case KVM_CAP_S390_USER_SIGP: 599 case KVM_CAP_S390_USER_STSI: 600 case KVM_CAP_S390_SKEYS: 601 case KVM_CAP_S390_IRQ_STATE: 602 case KVM_CAP_S390_USER_INSTR0: 603 case KVM_CAP_S390_CMMA_MIGRATION: 604 case KVM_CAP_S390_AIS: 605 case KVM_CAP_S390_AIS_MIGRATION: 606 case KVM_CAP_S390_VCPU_RESETS: 607 case KVM_CAP_SET_GUEST_DEBUG: 608 case KVM_CAP_S390_DIAG318: 609 case KVM_CAP_IRQFD_RESAMPLE: 610 case KVM_CAP_S390_USER_OPEREXEC: 611 r = 1; 612 break; 613 case KVM_CAP_SET_GUEST_DEBUG2: 614 r = KVM_GUESTDBG_VALID_MASK; 615 break; 616 case KVM_CAP_S390_HPAGE_1M: 617 r = 0; 618 if (hpage && !(kvm && kvm_is_ucontrol(kvm))) 619 r = 1; 620 break; 621 case KVM_CAP_S390_MEM_OP: 622 r = MEM_OP_MAX_SIZE; 623 break; 624 case KVM_CAP_S390_MEM_OP_EXTENSION: 625 /* 626 * Flag bits indicating which extensions are supported. 627 * If r > 0, the base extension must also be supported/indicated, 628 * in order to maintain backwards compatibility. 629 */ 630 r = KVM_S390_MEMOP_EXTENSION_CAP_BASE | 631 KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG; 632 break; 633 case KVM_CAP_NR_VCPUS: 634 case KVM_CAP_MAX_VCPUS: 635 case KVM_CAP_MAX_VCPU_ID: 636 /* 637 * Return the same value for KVM_CAP_MAX_VCPUS and 638 * KVM_CAP_MAX_VCPU_ID to conform with the KVM API. 639 */ 640 r = KVM_S390_ESCA_CPU_SLOTS; 641 if (!kvm_s390_use_sca_entries()) 642 r = KVM_MAX_VCPUS; 643 if (ext == KVM_CAP_NR_VCPUS) 644 r = min_t(unsigned int, num_online_cpus(), r); 645 break; 646 case KVM_CAP_S390_COW: 647 r = machine_has_esop(); 648 break; 649 case KVM_CAP_S390_VECTOR_REGISTERS: 650 r = test_facility(129); 651 break; 652 case KVM_CAP_S390_RI: 653 r = test_facility(64); 654 break; 655 case KVM_CAP_S390_GS: 656 r = test_facility(133); 657 break; 658 case KVM_CAP_S390_BPB: 659 r = test_facility(82); 660 break; 661 case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE: 662 r = async_destroy && is_prot_virt_host(); 663 break; 664 case KVM_CAP_S390_PROTECTED: 665 r = is_prot_virt_host(); 666 break; 667 case KVM_CAP_S390_PROTECTED_DUMP: { 668 u64 pv_cmds_dump[] = { 669 BIT_UVC_CMD_DUMP_INIT, 670 BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE, 671 BIT_UVC_CMD_DUMP_CPU, 672 BIT_UVC_CMD_DUMP_COMPLETE, 673 }; 674 int i; 675 676 r = is_prot_virt_host(); 677 678 for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) { 679 if (!test_bit_inv(pv_cmds_dump[i], 680 (unsigned long *)&uv_info.inst_calls_list)) { 681 r = 0; 682 break; 683 } 684 } 685 break; 686 } 687 case KVM_CAP_S390_ZPCI_OP: 688 r = kvm_s390_pci_interp_allowed(); 689 break; 690 case KVM_CAP_S390_CPU_TOPOLOGY: 691 r = test_facility(11); 692 break; 693 default: 694 r = 0; 695 } 696 return r; 697} 698 699void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) 700{ 701 int i; 702 gfn_t cur_gfn, last_gfn; 703 unsigned long gaddr, vmaddr; 704 struct gmap *gmap = kvm->arch.gmap; 705 DECLARE_BITMAP(bitmap, _PAGE_ENTRIES); 706 707 /* Loop over all guest segments */ 708 cur_gfn = memslot->base_gfn; 709 last_gfn = memslot->base_gfn + memslot->npages; 710 for (; cur_gfn <= last_gfn; cur_gfn += _PAGE_ENTRIES) { 711 gaddr = gfn_to_gpa(cur_gfn); 712 vmaddr = gfn_to_hva_memslot(memslot, cur_gfn); 713 if (kvm_is_error_hva(vmaddr)) 714 continue; 715 716 bitmap_zero(bitmap, _PAGE_ENTRIES); 717 gmap_sync_dirty_log_pmd(gmap, bitmap, gaddr, vmaddr); 718 for (i = 0; i < _PAGE_ENTRIES; i++) { 719 if (test_bit(i, bitmap)) 720 mark_page_dirty(kvm, cur_gfn + i); 721 } 722 723 if (fatal_signal_pending(current)) 724 return; 725 cond_resched(); 726 } 727} 728 729/* Section: vm related */ 730static void sca_del_vcpu(struct kvm_vcpu *vcpu); 731 732/* 733 * Get (and clear) the dirty memory log for a memory slot. 734 */ 735int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 736 struct kvm_dirty_log *log) 737{ 738 int r; 739 unsigned long n; 740 struct kvm_memory_slot *memslot; 741 int is_dirty; 742 743 if (kvm_is_ucontrol(kvm)) 744 return -EINVAL; 745 746 mutex_lock(&kvm->slots_lock); 747 748 r = -EINVAL; 749 if (log->slot >= KVM_USER_MEM_SLOTS) 750 goto out; 751 752 r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot); 753 if (r) 754 goto out; 755 756 /* Clear the dirty log */ 757 if (is_dirty) { 758 n = kvm_dirty_bitmap_bytes(memslot); 759 memset(memslot->dirty_bitmap, 0, n); 760 } 761 r = 0; 762out: 763 mutex_unlock(&kvm->slots_lock); 764 return r; 765} 766 767static void icpt_operexc_on_all_vcpus(struct kvm *kvm) 768{ 769 unsigned long i; 770 struct kvm_vcpu *vcpu; 771 772 kvm_for_each_vcpu(i, vcpu, kvm) { 773 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu); 774 } 775} 776 777int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) 778{ 779 int r; 780 781 if (cap->flags) 782 return -EINVAL; 783 784 switch (cap->cap) { 785 case KVM_CAP_S390_IRQCHIP: 786 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP"); 787 kvm->arch.use_irqchip = 1; 788 r = 0; 789 break; 790 case KVM_CAP_S390_USER_SIGP: 791 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP"); 792 kvm->arch.user_sigp = 1; 793 r = 0; 794 break; 795 case KVM_CAP_S390_VECTOR_REGISTERS: 796 mutex_lock(&kvm->lock); 797 if (kvm->created_vcpus) { 798 r = -EBUSY; 799 } else if (cpu_has_vx()) { 800 set_kvm_facility(kvm->arch.model.fac_mask, 129); 801 set_kvm_facility(kvm->arch.model.fac_list, 129); 802 if (test_facility(134)) { 803 set_kvm_facility(kvm->arch.model.fac_mask, 134); 804 set_kvm_facility(kvm->arch.model.fac_list, 134); 805 } 806 if (test_facility(135)) { 807 set_kvm_facility(kvm->arch.model.fac_mask, 135); 808 set_kvm_facility(kvm->arch.model.fac_list, 135); 809 } 810 if (test_facility(148)) { 811 set_kvm_facility(kvm->arch.model.fac_mask, 148); 812 set_kvm_facility(kvm->arch.model.fac_list, 148); 813 } 814 if (test_facility(152)) { 815 set_kvm_facility(kvm->arch.model.fac_mask, 152); 816 set_kvm_facility(kvm->arch.model.fac_list, 152); 817 } 818 if (test_facility(192)) { 819 set_kvm_facility(kvm->arch.model.fac_mask, 192); 820 set_kvm_facility(kvm->arch.model.fac_list, 192); 821 } 822 if (test_facility(198)) { 823 set_kvm_facility(kvm->arch.model.fac_mask, 198); 824 set_kvm_facility(kvm->arch.model.fac_list, 198); 825 } 826 if (test_facility(199)) { 827 set_kvm_facility(kvm->arch.model.fac_mask, 199); 828 set_kvm_facility(kvm->arch.model.fac_list, 199); 829 } 830 r = 0; 831 } else 832 r = -EINVAL; 833 mutex_unlock(&kvm->lock); 834 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s", 835 r ? "(not available)" : "(success)"); 836 break; 837 case KVM_CAP_S390_RI: 838 r = -EINVAL; 839 mutex_lock(&kvm->lock); 840 if (kvm->created_vcpus) { 841 r = -EBUSY; 842 } else if (test_facility(64)) { 843 set_kvm_facility(kvm->arch.model.fac_mask, 64); 844 set_kvm_facility(kvm->arch.model.fac_list, 64); 845 r = 0; 846 } 847 mutex_unlock(&kvm->lock); 848 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s", 849 r ? "(not available)" : "(success)"); 850 break; 851 case KVM_CAP_S390_AIS: 852 mutex_lock(&kvm->lock); 853 if (kvm->created_vcpus) { 854 r = -EBUSY; 855 } else { 856 set_kvm_facility(kvm->arch.model.fac_mask, 72); 857 set_kvm_facility(kvm->arch.model.fac_list, 72); 858 r = 0; 859 } 860 mutex_unlock(&kvm->lock); 861 VM_EVENT(kvm, 3, "ENABLE: AIS %s", 862 r ? "(not available)" : "(success)"); 863 break; 864 case KVM_CAP_S390_GS: 865 r = -EINVAL; 866 mutex_lock(&kvm->lock); 867 if (kvm->created_vcpus) { 868 r = -EBUSY; 869 } else if (test_facility(133)) { 870 set_kvm_facility(kvm->arch.model.fac_mask, 133); 871 set_kvm_facility(kvm->arch.model.fac_list, 133); 872 r = 0; 873 } 874 mutex_unlock(&kvm->lock); 875 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s", 876 r ? "(not available)" : "(success)"); 877 break; 878 case KVM_CAP_S390_HPAGE_1M: 879 mutex_lock(&kvm->lock); 880 if (kvm->created_vcpus) 881 r = -EBUSY; 882 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm)) 883 r = -EINVAL; 884 else { 885 r = 0; 886 mmap_write_lock(kvm->mm); 887 kvm->mm->context.allow_gmap_hpage_1m = 1; 888 mmap_write_unlock(kvm->mm); 889 /* 890 * We might have to create fake 4k page 891 * tables. To avoid that the hardware works on 892 * stale PGSTEs, we emulate these instructions. 893 */ 894 kvm->arch.use_skf = 0; 895 kvm->arch.use_pfmfi = 0; 896 } 897 mutex_unlock(&kvm->lock); 898 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s", 899 r ? "(not available)" : "(success)"); 900 break; 901 case KVM_CAP_S390_USER_STSI: 902 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI"); 903 kvm->arch.user_stsi = 1; 904 r = 0; 905 break; 906 case KVM_CAP_S390_USER_INSTR0: 907 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0"); 908 kvm->arch.user_instr0 = 1; 909 icpt_operexc_on_all_vcpus(kvm); 910 r = 0; 911 break; 912 case KVM_CAP_S390_CPU_TOPOLOGY: 913 r = -EINVAL; 914 mutex_lock(&kvm->lock); 915 if (kvm->created_vcpus) { 916 r = -EBUSY; 917 } else if (test_facility(11)) { 918 set_kvm_facility(kvm->arch.model.fac_mask, 11); 919 set_kvm_facility(kvm->arch.model.fac_list, 11); 920 r = 0; 921 } 922 mutex_unlock(&kvm->lock); 923 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_CPU_TOPOLOGY %s", 924 r ? "(not available)" : "(success)"); 925 break; 926 case KVM_CAP_S390_USER_OPEREXEC: 927 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_OPEREXEC"); 928 kvm->arch.user_operexec = 1; 929 icpt_operexc_on_all_vcpus(kvm); 930 r = 0; 931 break; 932 default: 933 r = -EINVAL; 934 break; 935 } 936 return r; 937} 938 939static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 940{ 941 int ret; 942 943 switch (attr->attr) { 944 case KVM_S390_VM_MEM_LIMIT_SIZE: 945 ret = 0; 946 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes", 947 kvm->arch.mem_limit); 948 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr)) 949 ret = -EFAULT; 950 break; 951 default: 952 ret = -ENXIO; 953 break; 954 } 955 return ret; 956} 957 958static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) 959{ 960 int ret; 961 unsigned int idx; 962 switch (attr->attr) { 963 case KVM_S390_VM_MEM_ENABLE_CMMA: 964 ret = -ENXIO; 965 if (!sclp.has_cmma) 966 break; 967 968 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support"); 969 mutex_lock(&kvm->lock); 970 if (kvm->created_vcpus) 971 ret = -EBUSY; 972 else if (kvm->mm->context.allow_gmap_hpage_1m) 973 ret = -EINVAL; 974 else { 975 kvm->arch.use_cmma = 1; 976 /* Not compatible with cmma. */ 977 kvm->arch.use_pfmfi = 0; 978 ret = 0; 979 } 980 mutex_unlock(&kvm->lock); 981 break; 982 case KVM_S390_VM_MEM_CLR_CMMA: 983 ret = -ENXIO; 984 if (!sclp.has_cmma) 985 break; 986 ret = -EINVAL; 987 if (!kvm->arch.use_cmma) 988 break; 989 990 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states"); 991 mutex_lock(&kvm->lock); 992 idx = srcu_read_lock(&kvm->srcu); 993 s390_reset_cmma(kvm->arch.gmap->mm); 994 srcu_read_unlock(&kvm->srcu, idx); 995 mutex_unlock(&kvm->lock); 996 ret = 0; 997 break; 998 case KVM_S390_VM_MEM_LIMIT_SIZE: { 999 unsigned long new_limit; 1000 1001 if (kvm_is_ucontrol(kvm)) 1002 return -EINVAL; 1003 1004 if (get_user(new_limit, (u64 __user *)attr->addr)) 1005 return -EFAULT; 1006 1007 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT && 1008 new_limit > kvm->arch.mem_limit) 1009 return -E2BIG; 1010 1011 if (!new_limit) 1012 return -EINVAL; 1013 1014 /* gmap_create takes last usable address */ 1015 if (new_limit != KVM_S390_NO_MEM_LIMIT) 1016 new_limit -= 1; 1017 1018 ret = -EBUSY; 1019 mutex_lock(&kvm->lock); 1020 if (!kvm->created_vcpus) { 1021 /* gmap_create will round the limit up */ 1022 struct gmap *new = gmap_create(current->mm, new_limit); 1023 1024 if (!new) { 1025 ret = -ENOMEM; 1026 } else { 1027 gmap_remove(kvm->arch.gmap); 1028 new->private = kvm; 1029 kvm->arch.gmap = new; 1030 ret = 0; 1031 } 1032 } 1033 mutex_unlock(&kvm->lock); 1034 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit); 1035 VM_EVENT(kvm, 3, "New guest asce: 0x%p", 1036 (void *) kvm->arch.gmap->asce); 1037 break; 1038 } 1039 default: 1040 ret = -ENXIO; 1041 break; 1042 } 1043 return ret; 1044} 1045 1046static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu); 1047 1048void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm) 1049{ 1050 struct kvm_vcpu *vcpu; 1051 unsigned long i; 1052 1053 kvm_s390_vcpu_block_all(kvm); 1054 1055 kvm_for_each_vcpu(i, vcpu, kvm) { 1056 kvm_s390_vcpu_crypto_setup(vcpu); 1057 /* recreate the shadow crycb by leaving the VSIE handler */ 1058 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); 1059 } 1060 1061 kvm_s390_vcpu_unblock_all(kvm); 1062} 1063 1064static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr) 1065{ 1066 mutex_lock(&kvm->lock); 1067 switch (attr->attr) { 1068 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 1069 if (!test_kvm_facility(kvm, 76)) { 1070 mutex_unlock(&kvm->lock); 1071 return -EINVAL; 1072 } 1073 get_random_bytes( 1074 kvm->arch.crypto.crycb->aes_wrapping_key_mask, 1075 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 1076 kvm->arch.crypto.aes_kw = 1; 1077 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support"); 1078 break; 1079 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 1080 if (!test_kvm_facility(kvm, 76)) { 1081 mutex_unlock(&kvm->lock); 1082 return -EINVAL; 1083 } 1084 get_random_bytes( 1085 kvm->arch.crypto.crycb->dea_wrapping_key_mask, 1086 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 1087 kvm->arch.crypto.dea_kw = 1; 1088 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support"); 1089 break; 1090 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 1091 if (!test_kvm_facility(kvm, 76)) { 1092 mutex_unlock(&kvm->lock); 1093 return -EINVAL; 1094 } 1095 kvm->arch.crypto.aes_kw = 0; 1096 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0, 1097 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 1098 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support"); 1099 break; 1100 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 1101 if (!test_kvm_facility(kvm, 76)) { 1102 mutex_unlock(&kvm->lock); 1103 return -EINVAL; 1104 } 1105 kvm->arch.crypto.dea_kw = 0; 1106 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0, 1107 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 1108 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support"); 1109 break; 1110 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 1111 if (!ap_instructions_available()) { 1112 mutex_unlock(&kvm->lock); 1113 return -EOPNOTSUPP; 1114 } 1115 kvm->arch.crypto.apie = 1; 1116 break; 1117 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 1118 if (!ap_instructions_available()) { 1119 mutex_unlock(&kvm->lock); 1120 return -EOPNOTSUPP; 1121 } 1122 kvm->arch.crypto.apie = 0; 1123 break; 1124 default: 1125 mutex_unlock(&kvm->lock); 1126 return -ENXIO; 1127 } 1128 1129 kvm_s390_vcpu_crypto_reset_all(kvm); 1130 mutex_unlock(&kvm->lock); 1131 return 0; 1132} 1133 1134static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu) 1135{ 1136 /* Only set the ECB bits after guest requests zPCI interpretation */ 1137 if (!vcpu->kvm->arch.use_zpci_interp) 1138 return; 1139 1140 vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI; 1141 vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI; 1142} 1143 1144void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm) 1145{ 1146 struct kvm_vcpu *vcpu; 1147 unsigned long i; 1148 1149 lockdep_assert_held(&kvm->lock); 1150 1151 if (!kvm_s390_pci_interp_allowed()) 1152 return; 1153 1154 /* 1155 * If host is configured for PCI and the necessary facilities are 1156 * available, turn on interpretation for the life of this guest 1157 */ 1158 kvm->arch.use_zpci_interp = 1; 1159 1160 kvm_s390_vcpu_block_all(kvm); 1161 1162 kvm_for_each_vcpu(i, vcpu, kvm) { 1163 kvm_s390_vcpu_pci_setup(vcpu); 1164 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu); 1165 } 1166 1167 kvm_s390_vcpu_unblock_all(kvm); 1168} 1169 1170static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req) 1171{ 1172 unsigned long cx; 1173 struct kvm_vcpu *vcpu; 1174 1175 kvm_for_each_vcpu(cx, vcpu, kvm) 1176 kvm_s390_sync_request(req, vcpu); 1177} 1178 1179/* 1180 * Must be called with kvm->srcu held to avoid races on memslots, and with 1181 * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration. 1182 */ 1183static int kvm_s390_vm_start_migration(struct kvm *kvm) 1184{ 1185 struct kvm_memory_slot *ms; 1186 struct kvm_memslots *slots; 1187 unsigned long ram_pages = 0; 1188 int bkt; 1189 1190 /* migration mode already enabled */ 1191 if (kvm->arch.migration_mode) 1192 return 0; 1193 slots = kvm_memslots(kvm); 1194 if (!slots || kvm_memslots_empty(slots)) 1195 return -EINVAL; 1196 1197 if (!kvm->arch.use_cmma) { 1198 kvm->arch.migration_mode = 1; 1199 return 0; 1200 } 1201 /* mark all the pages in active slots as dirty */ 1202 kvm_for_each_memslot(ms, bkt, slots) { 1203 if (!ms->dirty_bitmap) 1204 return -EINVAL; 1205 /* 1206 * The second half of the bitmap is only used on x86, 1207 * and would be wasted otherwise, so we put it to good 1208 * use here to keep track of the state of the storage 1209 * attributes. 1210 */ 1211 memset(kvm_second_dirty_bitmap(ms), 0xff, kvm_dirty_bitmap_bytes(ms)); 1212 ram_pages += ms->npages; 1213 } 1214 atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages); 1215 kvm->arch.migration_mode = 1; 1216 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION); 1217 return 0; 1218} 1219 1220/* 1221 * Must be called with kvm->slots_lock to avoid races with ourselves and 1222 * kvm_s390_vm_start_migration. 1223 */ 1224static int kvm_s390_vm_stop_migration(struct kvm *kvm) 1225{ 1226 /* migration mode already disabled */ 1227 if (!kvm->arch.migration_mode) 1228 return 0; 1229 kvm->arch.migration_mode = 0; 1230 if (kvm->arch.use_cmma) 1231 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION); 1232 return 0; 1233} 1234 1235static int kvm_s390_vm_set_migration(struct kvm *kvm, 1236 struct kvm_device_attr *attr) 1237{ 1238 int res = -ENXIO; 1239 1240 mutex_lock(&kvm->slots_lock); 1241 switch (attr->attr) { 1242 case KVM_S390_VM_MIGRATION_START: 1243 res = kvm_s390_vm_start_migration(kvm); 1244 break; 1245 case KVM_S390_VM_MIGRATION_STOP: 1246 res = kvm_s390_vm_stop_migration(kvm); 1247 break; 1248 default: 1249 break; 1250 } 1251 mutex_unlock(&kvm->slots_lock); 1252 1253 return res; 1254} 1255 1256static int kvm_s390_vm_get_migration(struct kvm *kvm, 1257 struct kvm_device_attr *attr) 1258{ 1259 u64 mig = kvm->arch.migration_mode; 1260 1261 if (attr->attr != KVM_S390_VM_MIGRATION_STATUS) 1262 return -ENXIO; 1263 1264 if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig))) 1265 return -EFAULT; 1266 return 0; 1267} 1268 1269static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod); 1270 1271static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1272{ 1273 struct kvm_s390_vm_tod_clock gtod; 1274 1275 if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod))) 1276 return -EFAULT; 1277 1278 if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx) 1279 return -EINVAL; 1280 __kvm_s390_set_tod_clock(kvm, >od); 1281 1282 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx", 1283 gtod.epoch_idx, gtod.tod); 1284 1285 return 0; 1286} 1287 1288static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1289{ 1290 u8 gtod_high; 1291 1292 if (copy_from_user(>od_high, (void __user *)attr->addr, 1293 sizeof(gtod_high))) 1294 return -EFAULT; 1295 1296 if (gtod_high != 0) 1297 return -EINVAL; 1298 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high); 1299 1300 return 0; 1301} 1302 1303static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1304{ 1305 struct kvm_s390_vm_tod_clock gtod = { 0 }; 1306 1307 if (copy_from_user(>od.tod, (void __user *)attr->addr, 1308 sizeof(gtod.tod))) 1309 return -EFAULT; 1310 1311 __kvm_s390_set_tod_clock(kvm, >od); 1312 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod); 1313 return 0; 1314} 1315 1316static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1317{ 1318 int ret; 1319 1320 if (attr->flags) 1321 return -EINVAL; 1322 1323 mutex_lock(&kvm->lock); 1324 /* 1325 * For protected guests, the TOD is managed by the ultravisor, so trying 1326 * to change it will never bring the expected results. 1327 */ 1328 if (kvm_s390_pv_is_protected(kvm)) { 1329 ret = -EOPNOTSUPP; 1330 goto out_unlock; 1331 } 1332 1333 switch (attr->attr) { 1334 case KVM_S390_VM_TOD_EXT: 1335 ret = kvm_s390_set_tod_ext(kvm, attr); 1336 break; 1337 case KVM_S390_VM_TOD_HIGH: 1338 ret = kvm_s390_set_tod_high(kvm, attr); 1339 break; 1340 case KVM_S390_VM_TOD_LOW: 1341 ret = kvm_s390_set_tod_low(kvm, attr); 1342 break; 1343 default: 1344 ret = -ENXIO; 1345 break; 1346 } 1347 1348out_unlock: 1349 mutex_unlock(&kvm->lock); 1350 return ret; 1351} 1352 1353static void kvm_s390_get_tod_clock(struct kvm *kvm, 1354 struct kvm_s390_vm_tod_clock *gtod) 1355{ 1356 union tod_clock clk; 1357 1358 preempt_disable(); 1359 1360 store_tod_clock_ext(&clk); 1361 1362 gtod->tod = clk.tod + kvm->arch.epoch; 1363 gtod->epoch_idx = 0; 1364 if (test_kvm_facility(kvm, 139)) { 1365 gtod->epoch_idx = clk.ei + kvm->arch.epdx; 1366 if (gtod->tod < clk.tod) 1367 gtod->epoch_idx += 1; 1368 } 1369 1370 preempt_enable(); 1371} 1372 1373static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr) 1374{ 1375 struct kvm_s390_vm_tod_clock gtod; 1376 1377 memset(>od, 0, sizeof(gtod)); 1378 kvm_s390_get_tod_clock(kvm, >od); 1379 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1380 return -EFAULT; 1381 1382 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx", 1383 gtod.epoch_idx, gtod.tod); 1384 return 0; 1385} 1386 1387static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr) 1388{ 1389 u8 gtod_high = 0; 1390 1391 if (copy_to_user((void __user *)attr->addr, >od_high, 1392 sizeof(gtod_high))) 1393 return -EFAULT; 1394 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high); 1395 1396 return 0; 1397} 1398 1399static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr) 1400{ 1401 u64 gtod; 1402 1403 gtod = kvm_s390_get_tod_clock_fast(kvm); 1404 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod))) 1405 return -EFAULT; 1406 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod); 1407 1408 return 0; 1409} 1410 1411static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr) 1412{ 1413 int ret; 1414 1415 if (attr->flags) 1416 return -EINVAL; 1417 1418 switch (attr->attr) { 1419 case KVM_S390_VM_TOD_EXT: 1420 ret = kvm_s390_get_tod_ext(kvm, attr); 1421 break; 1422 case KVM_S390_VM_TOD_HIGH: 1423 ret = kvm_s390_get_tod_high(kvm, attr); 1424 break; 1425 case KVM_S390_VM_TOD_LOW: 1426 ret = kvm_s390_get_tod_low(kvm, attr); 1427 break; 1428 default: 1429 ret = -ENXIO; 1430 break; 1431 } 1432 return ret; 1433} 1434 1435static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1436{ 1437 struct kvm_s390_vm_cpu_processor *proc; 1438 u16 lowest_ibc, unblocked_ibc; 1439 int ret = 0; 1440 1441 mutex_lock(&kvm->lock); 1442 if (kvm->created_vcpus) { 1443 ret = -EBUSY; 1444 goto out; 1445 } 1446 proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT); 1447 if (!proc) { 1448 ret = -ENOMEM; 1449 goto out; 1450 } 1451 if (!copy_from_user(proc, (void __user *)attr->addr, 1452 sizeof(*proc))) { 1453 kvm->arch.model.cpuid = proc->cpuid; 1454 lowest_ibc = sclp.ibc >> 16 & 0xfff; 1455 unblocked_ibc = sclp.ibc & 0xfff; 1456 if (lowest_ibc && proc->ibc) { 1457 if (proc->ibc > unblocked_ibc) 1458 kvm->arch.model.ibc = unblocked_ibc; 1459 else if (proc->ibc < lowest_ibc) 1460 kvm->arch.model.ibc = lowest_ibc; 1461 else 1462 kvm->arch.model.ibc = proc->ibc; 1463 } 1464 memcpy(kvm->arch.model.fac_list, proc->fac_list, 1465 S390_ARCH_FAC_LIST_SIZE_BYTE); 1466 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1467 kvm->arch.model.ibc, 1468 kvm->arch.model.cpuid); 1469 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1470 kvm->arch.model.fac_list[0], 1471 kvm->arch.model.fac_list[1], 1472 kvm->arch.model.fac_list[2]); 1473 } else 1474 ret = -EFAULT; 1475 kfree(proc); 1476out: 1477 mutex_unlock(&kvm->lock); 1478 return ret; 1479} 1480 1481static int kvm_s390_set_processor_feat(struct kvm *kvm, 1482 struct kvm_device_attr *attr) 1483{ 1484 struct kvm_s390_vm_cpu_feat data; 1485 1486 if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data))) 1487 return -EFAULT; 1488 if (!bitmap_subset((unsigned long *) data.feat, 1489 kvm_s390_available_cpu_feat, 1490 KVM_S390_VM_CPU_FEAT_NR_BITS)) 1491 return -EINVAL; 1492 1493 mutex_lock(&kvm->lock); 1494 if (kvm->created_vcpus) { 1495 mutex_unlock(&kvm->lock); 1496 return -EBUSY; 1497 } 1498 bitmap_from_arr64(kvm->arch.cpu_feat, data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1499 mutex_unlock(&kvm->lock); 1500 VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1501 data.feat[0], 1502 data.feat[1], 1503 data.feat[2]); 1504 return 0; 1505} 1506 1507static int kvm_s390_set_processor_subfunc(struct kvm *kvm, 1508 struct kvm_device_attr *attr) 1509{ 1510 mutex_lock(&kvm->lock); 1511 if (kvm->created_vcpus) { 1512 mutex_unlock(&kvm->lock); 1513 return -EBUSY; 1514 } 1515 1516 if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr, 1517 sizeof(struct kvm_s390_vm_cpu_subfunc))) { 1518 mutex_unlock(&kvm->lock); 1519 return -EFAULT; 1520 } 1521 mutex_unlock(&kvm->lock); 1522 1523 VM_EVENT(kvm, 3, "SET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1524 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1525 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1526 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1527 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1528 VM_EVENT(kvm, 3, "SET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1529 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1530 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1531 VM_EVENT(kvm, 3, "SET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1532 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1533 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1534 VM_EVENT(kvm, 3, "SET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1535 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1536 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1537 VM_EVENT(kvm, 3, "SET: guest KM subfunc 0x%16.16lx.%16.16lx", 1538 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1539 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1540 VM_EVENT(kvm, 3, "SET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1541 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1542 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1543 VM_EVENT(kvm, 3, "SET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1544 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1545 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1546 VM_EVENT(kvm, 3, "SET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1547 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1548 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1549 VM_EVENT(kvm, 3, "SET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1550 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1551 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1552 VM_EVENT(kvm, 3, "SET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1553 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1554 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1555 VM_EVENT(kvm, 3, "SET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1556 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1557 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1558 VM_EVENT(kvm, 3, "SET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1559 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1560 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1561 VM_EVENT(kvm, 3, "SET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1562 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1563 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1564 VM_EVENT(kvm, 3, "SET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1565 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1566 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1567 VM_EVENT(kvm, 3, "SET: guest KDSA subfunc 0x%16.16lx.%16.16lx", 1568 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], 1569 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); 1570 VM_EVENT(kvm, 3, "SET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1571 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], 1572 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], 1573 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], 1574 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); 1575 VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1576 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], 1577 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], 1578 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], 1579 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); 1580 VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx", 1581 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1582 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1583 1584 return 0; 1585} 1586 1587#define KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK \ 1588( \ 1589 ((struct kvm_s390_vm_cpu_uv_feat){ \ 1590 .ap = 1, \ 1591 .ap_intr = 1, \ 1592 }) \ 1593 .feat \ 1594) 1595 1596static int kvm_s390_set_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1597{ 1598 struct kvm_s390_vm_cpu_uv_feat __user *ptr = (void __user *)attr->addr; 1599 unsigned long data, filter; 1600 1601 filter = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK; 1602 if (get_user(data, &ptr->feat)) 1603 return -EFAULT; 1604 if (!bitmap_subset(&data, &filter, KVM_S390_VM_CPU_UV_FEAT_NR_BITS)) 1605 return -EINVAL; 1606 1607 mutex_lock(&kvm->lock); 1608 if (kvm->created_vcpus) { 1609 mutex_unlock(&kvm->lock); 1610 return -EBUSY; 1611 } 1612 kvm->arch.model.uv_feat_guest.feat = data; 1613 mutex_unlock(&kvm->lock); 1614 1615 VM_EVENT(kvm, 3, "SET: guest UV-feat: 0x%16.16lx", data); 1616 1617 return 0; 1618} 1619 1620static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1621{ 1622 int ret = -ENXIO; 1623 1624 switch (attr->attr) { 1625 case KVM_S390_VM_CPU_PROCESSOR: 1626 ret = kvm_s390_set_processor(kvm, attr); 1627 break; 1628 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1629 ret = kvm_s390_set_processor_feat(kvm, attr); 1630 break; 1631 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1632 ret = kvm_s390_set_processor_subfunc(kvm, attr); 1633 break; 1634 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 1635 ret = kvm_s390_set_uv_feat(kvm, attr); 1636 break; 1637 } 1638 return ret; 1639} 1640 1641static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr) 1642{ 1643 struct kvm_s390_vm_cpu_processor *proc; 1644 int ret = 0; 1645 1646 proc = kzalloc(sizeof(*proc), GFP_KERNEL_ACCOUNT); 1647 if (!proc) { 1648 ret = -ENOMEM; 1649 goto out; 1650 } 1651 proc->cpuid = kvm->arch.model.cpuid; 1652 proc->ibc = kvm->arch.model.ibc; 1653 memcpy(&proc->fac_list, kvm->arch.model.fac_list, 1654 S390_ARCH_FAC_LIST_SIZE_BYTE); 1655 VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx", 1656 kvm->arch.model.ibc, 1657 kvm->arch.model.cpuid); 1658 VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1659 kvm->arch.model.fac_list[0], 1660 kvm->arch.model.fac_list[1], 1661 kvm->arch.model.fac_list[2]); 1662 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc))) 1663 ret = -EFAULT; 1664 kfree(proc); 1665out: 1666 return ret; 1667} 1668 1669static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr) 1670{ 1671 struct kvm_s390_vm_cpu_machine *mach; 1672 int ret = 0; 1673 1674 mach = kzalloc(sizeof(*mach), GFP_KERNEL_ACCOUNT); 1675 if (!mach) { 1676 ret = -ENOMEM; 1677 goto out; 1678 } 1679 get_cpu_id((struct cpuid *) &mach->cpuid); 1680 mach->ibc = sclp.ibc; 1681 memcpy(&mach->fac_mask, kvm->arch.model.fac_mask, 1682 S390_ARCH_FAC_LIST_SIZE_BYTE); 1683 memcpy((unsigned long *)&mach->fac_list, stfle_fac_list, 1684 sizeof(stfle_fac_list)); 1685 VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx", 1686 kvm->arch.model.ibc, 1687 kvm->arch.model.cpuid); 1688 VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx", 1689 mach->fac_mask[0], 1690 mach->fac_mask[1], 1691 mach->fac_mask[2]); 1692 VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx", 1693 mach->fac_list[0], 1694 mach->fac_list[1], 1695 mach->fac_list[2]); 1696 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach))) 1697 ret = -EFAULT; 1698 kfree(mach); 1699out: 1700 return ret; 1701} 1702 1703static int kvm_s390_get_processor_feat(struct kvm *kvm, 1704 struct kvm_device_attr *attr) 1705{ 1706 struct kvm_s390_vm_cpu_feat data; 1707 1708 bitmap_to_arr64(data.feat, kvm->arch.cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1709 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1710 return -EFAULT; 1711 VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1712 data.feat[0], 1713 data.feat[1], 1714 data.feat[2]); 1715 return 0; 1716} 1717 1718static int kvm_s390_get_machine_feat(struct kvm *kvm, 1719 struct kvm_device_attr *attr) 1720{ 1721 struct kvm_s390_vm_cpu_feat data; 1722 1723 bitmap_to_arr64(data.feat, kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS); 1724 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data))) 1725 return -EFAULT; 1726 VM_EVENT(kvm, 3, "GET: host feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx", 1727 data.feat[0], 1728 data.feat[1], 1729 data.feat[2]); 1730 return 0; 1731} 1732 1733static int kvm_s390_get_processor_subfunc(struct kvm *kvm, 1734 struct kvm_device_attr *attr) 1735{ 1736 if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs, 1737 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1738 return -EFAULT; 1739 1740 VM_EVENT(kvm, 3, "GET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1741 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0], 1742 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1], 1743 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2], 1744 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]); 1745 VM_EVENT(kvm, 3, "GET: guest PTFF subfunc 0x%16.16lx.%16.16lx", 1746 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0], 1747 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]); 1748 VM_EVENT(kvm, 3, "GET: guest KMAC subfunc 0x%16.16lx.%16.16lx", 1749 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0], 1750 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]); 1751 VM_EVENT(kvm, 3, "GET: guest KMC subfunc 0x%16.16lx.%16.16lx", 1752 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0], 1753 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]); 1754 VM_EVENT(kvm, 3, "GET: guest KM subfunc 0x%16.16lx.%16.16lx", 1755 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0], 1756 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]); 1757 VM_EVENT(kvm, 3, "GET: guest KIMD subfunc 0x%16.16lx.%16.16lx", 1758 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0], 1759 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]); 1760 VM_EVENT(kvm, 3, "GET: guest KLMD subfunc 0x%16.16lx.%16.16lx", 1761 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0], 1762 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]); 1763 VM_EVENT(kvm, 3, "GET: guest PCKMO subfunc 0x%16.16lx.%16.16lx", 1764 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0], 1765 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]); 1766 VM_EVENT(kvm, 3, "GET: guest KMCTR subfunc 0x%16.16lx.%16.16lx", 1767 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0], 1768 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]); 1769 VM_EVENT(kvm, 3, "GET: guest KMF subfunc 0x%16.16lx.%16.16lx", 1770 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0], 1771 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]); 1772 VM_EVENT(kvm, 3, "GET: guest KMO subfunc 0x%16.16lx.%16.16lx", 1773 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0], 1774 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]); 1775 VM_EVENT(kvm, 3, "GET: guest PCC subfunc 0x%16.16lx.%16.16lx", 1776 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0], 1777 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]); 1778 VM_EVENT(kvm, 3, "GET: guest PPNO subfunc 0x%16.16lx.%16.16lx", 1779 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0], 1780 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]); 1781 VM_EVENT(kvm, 3, "GET: guest KMA subfunc 0x%16.16lx.%16.16lx", 1782 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0], 1783 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]); 1784 VM_EVENT(kvm, 3, "GET: guest KDSA subfunc 0x%16.16lx.%16.16lx", 1785 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0], 1786 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]); 1787 VM_EVENT(kvm, 3, "GET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1788 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0], 1789 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1], 1790 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2], 1791 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]); 1792 VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1793 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0], 1794 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1], 1795 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2], 1796 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]); 1797 VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx", 1798 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1799 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1800 1801 return 0; 1802} 1803 1804static int kvm_s390_get_machine_subfunc(struct kvm *kvm, 1805 struct kvm_device_attr *attr) 1806{ 1807 if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc, 1808 sizeof(struct kvm_s390_vm_cpu_subfunc))) 1809 return -EFAULT; 1810 1811 VM_EVENT(kvm, 3, "GET: host PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1812 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0], 1813 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1], 1814 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2], 1815 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]); 1816 VM_EVENT(kvm, 3, "GET: host PTFF subfunc 0x%16.16lx.%16.16lx", 1817 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0], 1818 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]); 1819 VM_EVENT(kvm, 3, "GET: host KMAC subfunc 0x%16.16lx.%16.16lx", 1820 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0], 1821 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]); 1822 VM_EVENT(kvm, 3, "GET: host KMC subfunc 0x%16.16lx.%16.16lx", 1823 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0], 1824 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]); 1825 VM_EVENT(kvm, 3, "GET: host KM subfunc 0x%16.16lx.%16.16lx", 1826 ((unsigned long *) &kvm_s390_available_subfunc.km)[0], 1827 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]); 1828 VM_EVENT(kvm, 3, "GET: host KIMD subfunc 0x%16.16lx.%16.16lx", 1829 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0], 1830 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]); 1831 VM_EVENT(kvm, 3, "GET: host KLMD subfunc 0x%16.16lx.%16.16lx", 1832 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0], 1833 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]); 1834 VM_EVENT(kvm, 3, "GET: host PCKMO subfunc 0x%16.16lx.%16.16lx", 1835 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0], 1836 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]); 1837 VM_EVENT(kvm, 3, "GET: host KMCTR subfunc 0x%16.16lx.%16.16lx", 1838 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0], 1839 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]); 1840 VM_EVENT(kvm, 3, "GET: host KMF subfunc 0x%16.16lx.%16.16lx", 1841 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0], 1842 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]); 1843 VM_EVENT(kvm, 3, "GET: host KMO subfunc 0x%16.16lx.%16.16lx", 1844 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0], 1845 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]); 1846 VM_EVENT(kvm, 3, "GET: host PCC subfunc 0x%16.16lx.%16.16lx", 1847 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0], 1848 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]); 1849 VM_EVENT(kvm, 3, "GET: host PPNO subfunc 0x%16.16lx.%16.16lx", 1850 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0], 1851 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]); 1852 VM_EVENT(kvm, 3, "GET: host KMA subfunc 0x%16.16lx.%16.16lx", 1853 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0], 1854 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]); 1855 VM_EVENT(kvm, 3, "GET: host KDSA subfunc 0x%16.16lx.%16.16lx", 1856 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0], 1857 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]); 1858 VM_EVENT(kvm, 3, "GET: host SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1859 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0], 1860 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1], 1861 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2], 1862 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]); 1863 VM_EVENT(kvm, 3, "GET: host DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx", 1864 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0], 1865 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1], 1866 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2], 1867 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]); 1868 VM_EVENT(kvm, 3, "GET: host PFCR subfunc 0x%16.16lx.%16.16lx", 1869 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0], 1870 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]); 1871 1872 return 0; 1873} 1874 1875static int kvm_s390_get_processor_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1876{ 1877 struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr; 1878 unsigned long feat = kvm->arch.model.uv_feat_guest.feat; 1879 1880 if (put_user(feat, &dst->feat)) 1881 return -EFAULT; 1882 VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat); 1883 1884 return 0; 1885} 1886 1887static int kvm_s390_get_machine_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr) 1888{ 1889 struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr; 1890 unsigned long feat; 1891 1892 BUILD_BUG_ON(sizeof(*dst) != sizeof(uv_info.uv_feature_indications)); 1893 1894 feat = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK; 1895 if (put_user(feat, &dst->feat)) 1896 return -EFAULT; 1897 VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat); 1898 1899 return 0; 1900} 1901 1902static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr) 1903{ 1904 int ret = -ENXIO; 1905 1906 switch (attr->attr) { 1907 case KVM_S390_VM_CPU_PROCESSOR: 1908 ret = kvm_s390_get_processor(kvm, attr); 1909 break; 1910 case KVM_S390_VM_CPU_MACHINE: 1911 ret = kvm_s390_get_machine(kvm, attr); 1912 break; 1913 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 1914 ret = kvm_s390_get_processor_feat(kvm, attr); 1915 break; 1916 case KVM_S390_VM_CPU_MACHINE_FEAT: 1917 ret = kvm_s390_get_machine_feat(kvm, attr); 1918 break; 1919 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 1920 ret = kvm_s390_get_processor_subfunc(kvm, attr); 1921 break; 1922 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 1923 ret = kvm_s390_get_machine_subfunc(kvm, attr); 1924 break; 1925 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 1926 ret = kvm_s390_get_processor_uv_feat(kvm, attr); 1927 break; 1928 case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST: 1929 ret = kvm_s390_get_machine_uv_feat(kvm, attr); 1930 break; 1931 } 1932 return ret; 1933} 1934 1935/** 1936 * kvm_s390_update_topology_change_report - update CPU topology change report 1937 * @kvm: guest KVM description 1938 * @val: set or clear the MTCR bit 1939 * 1940 * Updates the Multiprocessor Topology-Change-Report bit to signal 1941 * the guest with a topology change. 1942 * This is only relevant if the topology facility is present. 1943 */ 1944static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val) 1945{ 1946 union sca_utility new, old; 1947 struct esca_block *sca; 1948 1949 sca = kvm->arch.sca; 1950 old = READ_ONCE(sca->utility); 1951 do { 1952 new = old; 1953 new.mtcr = val; 1954 } while (!try_cmpxchg(&sca->utility.val, &old.val, new.val)); 1955} 1956 1957static int kvm_s390_set_topo_change_indication(struct kvm *kvm, 1958 struct kvm_device_attr *attr) 1959{ 1960 if (!test_kvm_facility(kvm, 11)) 1961 return -ENXIO; 1962 1963 kvm_s390_update_topology_change_report(kvm, !!attr->attr); 1964 return 0; 1965} 1966 1967static int kvm_s390_get_topo_change_indication(struct kvm *kvm, 1968 struct kvm_device_attr *attr) 1969{ 1970 u8 topo; 1971 1972 if (!test_kvm_facility(kvm, 11)) 1973 return -ENXIO; 1974 1975 topo = kvm->arch.sca->utility.mtcr; 1976 1977 return put_user(topo, (u8 __user *)attr->addr); 1978} 1979 1980static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1981{ 1982 int ret; 1983 1984 switch (attr->group) { 1985 case KVM_S390_VM_MEM_CTRL: 1986 ret = kvm_s390_set_mem_control(kvm, attr); 1987 break; 1988 case KVM_S390_VM_TOD: 1989 ret = kvm_s390_set_tod(kvm, attr); 1990 break; 1991 case KVM_S390_VM_CPU_MODEL: 1992 ret = kvm_s390_set_cpu_model(kvm, attr); 1993 break; 1994 case KVM_S390_VM_CRYPTO: 1995 ret = kvm_s390_vm_set_crypto(kvm, attr); 1996 break; 1997 case KVM_S390_VM_MIGRATION: 1998 ret = kvm_s390_vm_set_migration(kvm, attr); 1999 break; 2000 case KVM_S390_VM_CPU_TOPOLOGY: 2001 ret = kvm_s390_set_topo_change_indication(kvm, attr); 2002 break; 2003 default: 2004 ret = -ENXIO; 2005 break; 2006 } 2007 2008 return ret; 2009} 2010 2011static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) 2012{ 2013 int ret; 2014 2015 switch (attr->group) { 2016 case KVM_S390_VM_MEM_CTRL: 2017 ret = kvm_s390_get_mem_control(kvm, attr); 2018 break; 2019 case KVM_S390_VM_TOD: 2020 ret = kvm_s390_get_tod(kvm, attr); 2021 break; 2022 case KVM_S390_VM_CPU_MODEL: 2023 ret = kvm_s390_get_cpu_model(kvm, attr); 2024 break; 2025 case KVM_S390_VM_MIGRATION: 2026 ret = kvm_s390_vm_get_migration(kvm, attr); 2027 break; 2028 case KVM_S390_VM_CPU_TOPOLOGY: 2029 ret = kvm_s390_get_topo_change_indication(kvm, attr); 2030 break; 2031 default: 2032 ret = -ENXIO; 2033 break; 2034 } 2035 2036 return ret; 2037} 2038 2039static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) 2040{ 2041 int ret; 2042 2043 switch (attr->group) { 2044 case KVM_S390_VM_MEM_CTRL: 2045 switch (attr->attr) { 2046 case KVM_S390_VM_MEM_ENABLE_CMMA: 2047 case KVM_S390_VM_MEM_CLR_CMMA: 2048 ret = sclp.has_cmma ? 0 : -ENXIO; 2049 break; 2050 case KVM_S390_VM_MEM_LIMIT_SIZE: 2051 ret = 0; 2052 break; 2053 default: 2054 ret = -ENXIO; 2055 break; 2056 } 2057 break; 2058 case KVM_S390_VM_TOD: 2059 switch (attr->attr) { 2060 case KVM_S390_VM_TOD_LOW: 2061 case KVM_S390_VM_TOD_HIGH: 2062 ret = 0; 2063 break; 2064 default: 2065 ret = -ENXIO; 2066 break; 2067 } 2068 break; 2069 case KVM_S390_VM_CPU_MODEL: 2070 switch (attr->attr) { 2071 case KVM_S390_VM_CPU_PROCESSOR: 2072 case KVM_S390_VM_CPU_MACHINE: 2073 case KVM_S390_VM_CPU_PROCESSOR_FEAT: 2074 case KVM_S390_VM_CPU_MACHINE_FEAT: 2075 case KVM_S390_VM_CPU_MACHINE_SUBFUNC: 2076 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC: 2077 case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST: 2078 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST: 2079 ret = 0; 2080 break; 2081 default: 2082 ret = -ENXIO; 2083 break; 2084 } 2085 break; 2086 case KVM_S390_VM_CRYPTO: 2087 switch (attr->attr) { 2088 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW: 2089 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW: 2090 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW: 2091 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW: 2092 ret = 0; 2093 break; 2094 case KVM_S390_VM_CRYPTO_ENABLE_APIE: 2095 case KVM_S390_VM_CRYPTO_DISABLE_APIE: 2096 ret = ap_instructions_available() ? 0 : -ENXIO; 2097 break; 2098 default: 2099 ret = -ENXIO; 2100 break; 2101 } 2102 break; 2103 case KVM_S390_VM_MIGRATION: 2104 ret = 0; 2105 break; 2106 case KVM_S390_VM_CPU_TOPOLOGY: 2107 ret = test_kvm_facility(kvm, 11) ? 0 : -ENXIO; 2108 break; 2109 default: 2110 ret = -ENXIO; 2111 break; 2112 } 2113 2114 return ret; 2115} 2116 2117static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 2118{ 2119 uint8_t *keys; 2120 uint64_t hva; 2121 int srcu_idx, i, r = 0; 2122 2123 if (args->flags != 0) 2124 return -EINVAL; 2125 2126 /* Is this guest using storage keys? */ 2127 if (!mm_uses_skeys(current->mm)) 2128 return KVM_S390_GET_SKEYS_NONE; 2129 2130 /* Enforce sane limit on memory allocation */ 2131 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 2132 return -EINVAL; 2133 2134 keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT); 2135 if (!keys) 2136 return -ENOMEM; 2137 2138 mmap_read_lock(current->mm); 2139 srcu_idx = srcu_read_lock(&kvm->srcu); 2140 for (i = 0; i < args->count; i++) { 2141 hva = gfn_to_hva(kvm, args->start_gfn + i); 2142 if (kvm_is_error_hva(hva)) { 2143 r = -EFAULT; 2144 break; 2145 } 2146 2147 r = get_guest_storage_key(current->mm, hva, &keys[i]); 2148 if (r) 2149 break; 2150 } 2151 srcu_read_unlock(&kvm->srcu, srcu_idx); 2152 mmap_read_unlock(current->mm); 2153 2154 if (!r) { 2155 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys, 2156 sizeof(uint8_t) * args->count); 2157 if (r) 2158 r = -EFAULT; 2159 } 2160 2161 kvfree(keys); 2162 return r; 2163} 2164 2165static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args) 2166{ 2167 uint8_t *keys; 2168 uint64_t hva; 2169 int srcu_idx, i, r = 0; 2170 bool unlocked; 2171 2172 if (args->flags != 0) 2173 return -EINVAL; 2174 2175 /* Enforce sane limit on memory allocation */ 2176 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX) 2177 return -EINVAL; 2178 2179 keys = kvmalloc_array(args->count, sizeof(uint8_t), GFP_KERNEL_ACCOUNT); 2180 if (!keys) 2181 return -ENOMEM; 2182 2183 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr, 2184 sizeof(uint8_t) * args->count); 2185 if (r) { 2186 r = -EFAULT; 2187 goto out; 2188 } 2189 2190 /* Enable storage key handling for the guest */ 2191 r = s390_enable_skey(); 2192 if (r) 2193 goto out; 2194 2195 i = 0; 2196 mmap_read_lock(current->mm); 2197 srcu_idx = srcu_read_lock(&kvm->srcu); 2198 while (i < args->count) { 2199 unlocked = false; 2200 hva = gfn_to_hva(kvm, args->start_gfn + i); 2201 if (kvm_is_error_hva(hva)) { 2202 r = -EFAULT; 2203 break; 2204 } 2205 2206 /* Lowest order bit is reserved */ 2207 if (keys[i] & 0x01) { 2208 r = -EINVAL; 2209 break; 2210 } 2211 2212 r = set_guest_storage_key(current->mm, hva, keys[i], 0); 2213 if (r) { 2214 r = fixup_user_fault(current->mm, hva, 2215 FAULT_FLAG_WRITE, &unlocked); 2216 if (r) 2217 break; 2218 } 2219 if (!r) 2220 i++; 2221 } 2222 srcu_read_unlock(&kvm->srcu, srcu_idx); 2223 mmap_read_unlock(current->mm); 2224out: 2225 kvfree(keys); 2226 return r; 2227} 2228 2229/* 2230 * Base address and length must be sent at the start of each block, therefore 2231 * it's cheaper to send some clean data, as long as it's less than the size of 2232 * two longs. 2233 */ 2234#define KVM_S390_MAX_BIT_DISTANCE (2 * sizeof(void *)) 2235/* for consistency */ 2236#define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX) 2237 2238static int kvm_s390_peek_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args, 2239 u8 *res, unsigned long bufsize) 2240{ 2241 unsigned long pgstev, hva, cur_gfn = args->start_gfn; 2242 2243 args->count = 0; 2244 while (args->count < bufsize) { 2245 hva = gfn_to_hva(kvm, cur_gfn); 2246 /* 2247 * We return an error if the first value was invalid, but we 2248 * return successfully if at least one value was copied. 2249 */ 2250 if (kvm_is_error_hva(hva)) 2251 return args->count ? 0 : -EFAULT; 2252 if (get_pgste(kvm->mm, hva, &pgstev) < 0) 2253 pgstev = 0; 2254 res[args->count++] = (pgstev >> 24) & 0x43; 2255 cur_gfn++; 2256 } 2257 2258 return 0; 2259} 2260 2261static struct kvm_memory_slot *gfn_to_memslot_approx(struct kvm_memslots *slots, 2262 gfn_t gfn) 2263{ 2264 return ____gfn_to_memslot(slots, gfn, true); 2265} 2266 2267static unsigned long kvm_s390_next_dirty_cmma(struct kvm_memslots *slots, 2268 unsigned long cur_gfn) 2269{ 2270 struct kvm_memory_slot *ms = gfn_to_memslot_approx(slots, cur_gfn); 2271 unsigned long ofs = cur_gfn - ms->base_gfn; 2272 struct rb_node *mnode = &ms->gfn_node[slots->node_idx]; 2273 2274 if (ms->base_gfn + ms->npages <= cur_gfn) { 2275 mnode = rb_next(mnode); 2276 /* If we are above the highest slot, wrap around */ 2277 if (!mnode) 2278 mnode = rb_first(&slots->gfn_tree); 2279 2280 ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]); 2281 ofs = 0; 2282 } 2283 2284 if (cur_gfn < ms->base_gfn) 2285 ofs = 0; 2286 2287 ofs = find_next_bit(kvm_second_dirty_bitmap(ms), ms->npages, ofs); 2288 while (ofs >= ms->npages && (mnode = rb_next(mnode))) { 2289 ms = container_of(mnode, struct kvm_memory_slot, gfn_node[slots->node_idx]); 2290 ofs = find_first_bit(kvm_second_dirty_bitmap(ms), ms->npages); 2291 } 2292 return ms->base_gfn + ofs; 2293} 2294 2295static int kvm_s390_get_cmma(struct kvm *kvm, struct kvm_s390_cmma_log *args, 2296 u8 *res, unsigned long bufsize) 2297{ 2298 unsigned long mem_end, cur_gfn, next_gfn, hva, pgstev; 2299 struct kvm_memslots *slots = kvm_memslots(kvm); 2300 struct kvm_memory_slot *ms; 2301 2302 if (unlikely(kvm_memslots_empty(slots))) 2303 return 0; 2304 2305 cur_gfn = kvm_s390_next_dirty_cmma(slots, args->start_gfn); 2306 ms = gfn_to_memslot(kvm, cur_gfn); 2307 args->count = 0; 2308 args->start_gfn = cur_gfn; 2309 if (!ms) 2310 return 0; 2311 next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1); 2312 mem_end = kvm_s390_get_gfn_end(slots); 2313 2314 while (args->count < bufsize) { 2315 hva = gfn_to_hva(kvm, cur_gfn); 2316 if (kvm_is_error_hva(hva)) 2317 return 0; 2318 /* Decrement only if we actually flipped the bit to 0 */ 2319 if (test_and_clear_bit(cur_gfn - ms->base_gfn, kvm_second_dirty_bitmap(ms))) 2320 atomic64_dec(&kvm->arch.cmma_dirty_pages); 2321 if (get_pgste(kvm->mm, hva, &pgstev) < 0) 2322 pgstev = 0; 2323 /* Save the value */ 2324 res[args->count++] = (pgstev >> 24) & 0x43; 2325 /* If the next bit is too far away, stop. */ 2326 if (next_gfn > cur_gfn + KVM_S390_MAX_BIT_DISTANCE) 2327 return 0; 2328 /* If we reached the previous "next", find the next one */ 2329 if (cur_gfn == next_gfn) 2330 next_gfn = kvm_s390_next_dirty_cmma(slots, cur_gfn + 1); 2331 /* Reached the end of memory or of the buffer, stop */ 2332 if ((next_gfn >= mem_end) || 2333 (next_gfn - args->start_gfn >= bufsize)) 2334 return 0; 2335 cur_gfn++; 2336 /* Reached the end of the current memslot, take the next one. */ 2337 if (cur_gfn - ms->base_gfn >= ms->npages) { 2338 ms = gfn_to_memslot(kvm, cur_gfn); 2339 if (!ms) 2340 return 0; 2341 } 2342 } 2343 return 0; 2344} 2345 2346/* 2347 * This function searches for the next page with dirty CMMA attributes, and 2348 * saves the attributes in the buffer up to either the end of the buffer or 2349 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found; 2350 * no trailing clean bytes are saved. 2351 * In case no dirty bits were found, or if CMMA was not enabled or used, the 2352 * output buffer will indicate 0 as length. 2353 */ 2354static int kvm_s390_get_cmma_bits(struct kvm *kvm, 2355 struct kvm_s390_cmma_log *args) 2356{ 2357 unsigned long bufsize; 2358 int srcu_idx, peek, ret; 2359 u8 *values; 2360 2361 if (!kvm->arch.use_cmma) 2362 return -ENXIO; 2363 /* Invalid/unsupported flags were specified */ 2364 if (args->flags & ~KVM_S390_CMMA_PEEK) 2365 return -EINVAL; 2366 /* Migration mode query, and we are not doing a migration */ 2367 peek = !!(args->flags & KVM_S390_CMMA_PEEK); 2368 if (!peek && !kvm->arch.migration_mode) 2369 return -EINVAL; 2370 /* CMMA is disabled or was not used, or the buffer has length zero */ 2371 bufsize = min(args->count, KVM_S390_CMMA_SIZE_MAX); 2372 if (!bufsize || !kvm->mm->context.uses_cmm) { 2373 memset(args, 0, sizeof(*args)); 2374 return 0; 2375 } 2376 /* We are not peeking, and there are no dirty pages */ 2377 if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) { 2378 memset(args, 0, sizeof(*args)); 2379 return 0; 2380 } 2381 2382 values = vmalloc(bufsize); 2383 if (!values) 2384 return -ENOMEM; 2385 2386 mmap_read_lock(kvm->mm); 2387 srcu_idx = srcu_read_lock(&kvm->srcu); 2388 if (peek) 2389 ret = kvm_s390_peek_cmma(kvm, args, values, bufsize); 2390 else 2391 ret = kvm_s390_get_cmma(kvm, args, values, bufsize); 2392 srcu_read_unlock(&kvm->srcu, srcu_idx); 2393 mmap_read_unlock(kvm->mm); 2394 2395 if (kvm->arch.migration_mode) 2396 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages); 2397 else 2398 args->remaining = 0; 2399 2400 if (copy_to_user((void __user *)args->values, values, args->count)) 2401 ret = -EFAULT; 2402 2403 vfree(values); 2404 return ret; 2405} 2406 2407/* 2408 * This function sets the CMMA attributes for the given pages. If the input 2409 * buffer has zero length, no action is taken, otherwise the attributes are 2410 * set and the mm->context.uses_cmm flag is set. 2411 */ 2412static int kvm_s390_set_cmma_bits(struct kvm *kvm, 2413 const struct kvm_s390_cmma_log *args) 2414{ 2415 unsigned long hva, mask, pgstev, i; 2416 uint8_t *bits; 2417 int srcu_idx, r = 0; 2418 2419 mask = args->mask; 2420 2421 if (!kvm->arch.use_cmma) 2422 return -ENXIO; 2423 /* invalid/unsupported flags */ 2424 if (args->flags != 0) 2425 return -EINVAL; 2426 /* Enforce sane limit on memory allocation */ 2427 if (args->count > KVM_S390_CMMA_SIZE_MAX) 2428 return -EINVAL; 2429 /* Nothing to do */ 2430 if (args->count == 0) 2431 return 0; 2432 2433 bits = vmalloc(array_size(sizeof(*bits), args->count)); 2434 if (!bits) 2435 return -ENOMEM; 2436 2437 r = copy_from_user(bits, (void __user *)args->values, args->count); 2438 if (r) { 2439 r = -EFAULT; 2440 goto out; 2441 } 2442 2443 mmap_read_lock(kvm->mm); 2444 srcu_idx = srcu_read_lock(&kvm->srcu); 2445 for (i = 0; i < args->count; i++) { 2446 hva = gfn_to_hva(kvm, args->start_gfn + i); 2447 if (kvm_is_error_hva(hva)) { 2448 r = -EFAULT; 2449 break; 2450 } 2451 2452 pgstev = bits[i]; 2453 pgstev = pgstev << 24; 2454 mask &= _PGSTE_GPS_USAGE_MASK | _PGSTE_GPS_NODAT; 2455 set_pgste_bits(kvm->mm, hva, mask, pgstev); 2456 } 2457 srcu_read_unlock(&kvm->srcu, srcu_idx); 2458 mmap_read_unlock(kvm->mm); 2459 2460 if (!kvm->mm->context.uses_cmm) { 2461 mmap_write_lock(kvm->mm); 2462 kvm->mm->context.uses_cmm = 1; 2463 mmap_write_unlock(kvm->mm); 2464 } 2465out: 2466 vfree(bits); 2467 return r; 2468} 2469 2470/** 2471 * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to 2472 * non protected. 2473 * @kvm: the VM whose protected vCPUs are to be converted 2474 * @rc: return value for the RC field of the UVC (in case of error) 2475 * @rrc: return value for the RRC field of the UVC (in case of error) 2476 * 2477 * Does not stop in case of error, tries to convert as many 2478 * CPUs as possible. In case of error, the RC and RRC of the last error are 2479 * returned. 2480 * 2481 * Return: 0 in case of success, otherwise -EIO 2482 */ 2483int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc) 2484{ 2485 struct kvm_vcpu *vcpu; 2486 unsigned long i; 2487 u16 _rc, _rrc; 2488 int ret = 0; 2489 2490 /* 2491 * We ignore failures and try to destroy as many CPUs as possible. 2492 * At the same time we must not free the assigned resources when 2493 * this fails, as the ultravisor has still access to that memory. 2494 * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak 2495 * behind. 2496 * We want to return the first failure rc and rrc, though. 2497 */ 2498 kvm_for_each_vcpu(i, vcpu, kvm) { 2499 mutex_lock(&vcpu->mutex); 2500 if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) { 2501 *rc = _rc; 2502 *rrc = _rrc; 2503 ret = -EIO; 2504 } 2505 mutex_unlock(&vcpu->mutex); 2506 } 2507 /* Ensure that we re-enable gisa if the non-PV guest used it but the PV guest did not. */ 2508 if (use_gisa) 2509 kvm_s390_gisa_enable(kvm); 2510 return ret; 2511} 2512 2513/** 2514 * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM 2515 * to protected. 2516 * @kvm: the VM whose protected vCPUs are to be converted 2517 * @rc: return value for the RC field of the UVC (in case of error) 2518 * @rrc: return value for the RRC field of the UVC (in case of error) 2519 * 2520 * Tries to undo the conversion in case of error. 2521 * 2522 * Return: 0 in case of success, otherwise -EIO 2523 */ 2524static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc) 2525{ 2526 unsigned long i; 2527 int r = 0; 2528 u16 dummy; 2529 2530 struct kvm_vcpu *vcpu; 2531 2532 /* Disable the GISA if the ultravisor does not support AIV. */ 2533 if (!uv_has_feature(BIT_UV_FEAT_AIV)) 2534 kvm_s390_gisa_disable(kvm); 2535 2536 kvm_for_each_vcpu(i, vcpu, kvm) { 2537 mutex_lock(&vcpu->mutex); 2538 r = kvm_s390_pv_create_cpu(vcpu, rc, rrc); 2539 mutex_unlock(&vcpu->mutex); 2540 if (r) 2541 break; 2542 } 2543 if (r) 2544 kvm_s390_cpus_from_pv(kvm, &dummy, &dummy); 2545 return r; 2546} 2547 2548/* 2549 * Here we provide user space with a direct interface to query UV 2550 * related data like UV maxima and available features as well as 2551 * feature specific data. 2552 * 2553 * To facilitate future extension of the data structures we'll try to 2554 * write data up to the maximum requested length. 2555 */ 2556static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info) 2557{ 2558 ssize_t len_min; 2559 2560 switch (info->header.id) { 2561 case KVM_PV_INFO_VM: { 2562 len_min = sizeof(info->header) + sizeof(info->vm); 2563 2564 if (info->header.len_max < len_min) 2565 return -EINVAL; 2566 2567 memcpy(info->vm.inst_calls_list, 2568 uv_info.inst_calls_list, 2569 sizeof(uv_info.inst_calls_list)); 2570 2571 /* It's max cpuid not max cpus, so it's off by one */ 2572 info->vm.max_cpus = uv_info.max_guest_cpu_id + 1; 2573 info->vm.max_guests = uv_info.max_num_sec_conf; 2574 info->vm.max_guest_addr = uv_info.max_sec_stor_addr; 2575 info->vm.feature_indication = uv_info.uv_feature_indications; 2576 2577 return len_min; 2578 } 2579 case KVM_PV_INFO_DUMP: { 2580 len_min = sizeof(info->header) + sizeof(info->dump); 2581 2582 if (info->header.len_max < len_min) 2583 return -EINVAL; 2584 2585 info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len; 2586 info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len; 2587 info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len; 2588 return len_min; 2589 } 2590 default: 2591 return -EINVAL; 2592 } 2593} 2594 2595static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd, 2596 struct kvm_s390_pv_dmp dmp) 2597{ 2598 int r = -EINVAL; 2599 void __user *result_buff = (void __user *)dmp.buff_addr; 2600 2601 switch (dmp.subcmd) { 2602 case KVM_PV_DUMP_INIT: { 2603 if (kvm->arch.pv.dumping) 2604 break; 2605 2606 /* 2607 * Block SIE entry as concurrent dump UVCs could lead 2608 * to validities. 2609 */ 2610 kvm_s390_vcpu_block_all(kvm); 2611 2612 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2613 UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc); 2614 KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x", 2615 cmd->rc, cmd->rrc); 2616 if (!r) { 2617 kvm->arch.pv.dumping = true; 2618 } else { 2619 kvm_s390_vcpu_unblock_all(kvm); 2620 r = -EINVAL; 2621 } 2622 break; 2623 } 2624 case KVM_PV_DUMP_CONFIG_STOR_STATE: { 2625 if (!kvm->arch.pv.dumping) 2626 break; 2627 2628 /* 2629 * gaddr is an output parameter since we might stop 2630 * early. As dmp will be copied back in our caller, we 2631 * don't need to do it ourselves. 2632 */ 2633 r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len, 2634 &cmd->rc, &cmd->rrc); 2635 break; 2636 } 2637 case KVM_PV_DUMP_COMPLETE: { 2638 if (!kvm->arch.pv.dumping) 2639 break; 2640 2641 r = -EINVAL; 2642 if (dmp.buff_len < uv_info.conf_dump_finalize_len) 2643 break; 2644 2645 r = kvm_s390_pv_dump_complete(kvm, result_buff, 2646 &cmd->rc, &cmd->rrc); 2647 break; 2648 } 2649 default: 2650 r = -ENOTTY; 2651 break; 2652 } 2653 2654 return r; 2655} 2656 2657static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) 2658{ 2659 const bool need_lock = (cmd->cmd != KVM_PV_ASYNC_CLEANUP_PERFORM); 2660 void __user *argp = (void __user *)cmd->data; 2661 int r = 0; 2662 u16 dummy; 2663 2664 if (need_lock) 2665 mutex_lock(&kvm->lock); 2666 2667 switch (cmd->cmd) { 2668 case KVM_PV_ENABLE: { 2669 r = -EINVAL; 2670 if (kvm_s390_pv_is_protected(kvm)) 2671 break; 2672 2673 mmap_write_lock(kvm->mm); 2674 r = gmap_helper_disable_cow_sharing(); 2675 mmap_write_unlock(kvm->mm); 2676 if (r) 2677 break; 2678 2679 r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc); 2680 if (r) 2681 break; 2682 2683 r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc); 2684 if (r) 2685 kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy); 2686 2687 /* we need to block service interrupts from now on */ 2688 set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2689 break; 2690 } 2691 case KVM_PV_ASYNC_CLEANUP_PREPARE: 2692 r = -EINVAL; 2693 if (!kvm_s390_pv_is_protected(kvm) || !async_destroy) 2694 break; 2695 2696 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); 2697 /* 2698 * If a CPU could not be destroyed, destroy VM will also fail. 2699 * There is no point in trying to destroy it. Instead return 2700 * the rc and rrc from the first CPU that failed destroying. 2701 */ 2702 if (r) 2703 break; 2704 r = kvm_s390_pv_set_aside(kvm, &cmd->rc, &cmd->rrc); 2705 2706 /* no need to block service interrupts any more */ 2707 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2708 break; 2709 case KVM_PV_ASYNC_CLEANUP_PERFORM: 2710 r = -EINVAL; 2711 if (!async_destroy) 2712 break; 2713 /* kvm->lock must not be held; this is asserted inside the function. */ 2714 r = kvm_s390_pv_deinit_aside_vm(kvm, &cmd->rc, &cmd->rrc); 2715 break; 2716 case KVM_PV_DISABLE: { 2717 r = -EINVAL; 2718 if (!kvm_s390_pv_is_protected(kvm)) 2719 break; 2720 2721 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc); 2722 /* 2723 * If a CPU could not be destroyed, destroy VM will also fail. 2724 * There is no point in trying to destroy it. Instead return 2725 * the rc and rrc from the first CPU that failed destroying. 2726 */ 2727 if (r) 2728 break; 2729 r = kvm_s390_pv_deinit_cleanup_all(kvm, &cmd->rc, &cmd->rrc); 2730 2731 /* no need to block service interrupts any more */ 2732 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs); 2733 break; 2734 } 2735 case KVM_PV_SET_SEC_PARMS: { 2736 struct kvm_s390_pv_sec_parm parms = {}; 2737 void *hdr; 2738 2739 r = -EINVAL; 2740 if (!kvm_s390_pv_is_protected(kvm)) 2741 break; 2742 2743 r = -EFAULT; 2744 if (copy_from_user(&parms, argp, sizeof(parms))) 2745 break; 2746 2747 /* Currently restricted to 8KB */ 2748 r = -EINVAL; 2749 if (parms.length > PAGE_SIZE * 2) 2750 break; 2751 2752 r = -ENOMEM; 2753 hdr = vmalloc(parms.length); 2754 if (!hdr) 2755 break; 2756 2757 r = -EFAULT; 2758 if (!copy_from_user(hdr, (void __user *)parms.origin, 2759 parms.length)) 2760 r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length, 2761 &cmd->rc, &cmd->rrc); 2762 2763 vfree(hdr); 2764 break; 2765 } 2766 case KVM_PV_UNPACK: { 2767 struct kvm_s390_pv_unp unp = {}; 2768 2769 r = -EINVAL; 2770 if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm)) 2771 break; 2772 2773 r = -EFAULT; 2774 if (copy_from_user(&unp, argp, sizeof(unp))) 2775 break; 2776 2777 r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak, 2778 &cmd->rc, &cmd->rrc); 2779 break; 2780 } 2781 case KVM_PV_VERIFY: { 2782 r = -EINVAL; 2783 if (!kvm_s390_pv_is_protected(kvm)) 2784 break; 2785 2786 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2787 UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc); 2788 KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc, 2789 cmd->rrc); 2790 break; 2791 } 2792 case KVM_PV_PREP_RESET: { 2793 r = -EINVAL; 2794 if (!kvm_s390_pv_is_protected(kvm)) 2795 break; 2796 2797 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2798 UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc); 2799 KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x", 2800 cmd->rc, cmd->rrc); 2801 break; 2802 } 2803 case KVM_PV_UNSHARE_ALL: { 2804 r = -EINVAL; 2805 if (!kvm_s390_pv_is_protected(kvm)) 2806 break; 2807 2808 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm), 2809 UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc); 2810 KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x", 2811 cmd->rc, cmd->rrc); 2812 break; 2813 } 2814 case KVM_PV_INFO: { 2815 struct kvm_s390_pv_info info = {}; 2816 ssize_t data_len; 2817 2818 /* 2819 * No need to check the VM protection here. 2820 * 2821 * Maybe user space wants to query some of the data 2822 * when the VM is still unprotected. If we see the 2823 * need to fence a new data command we can still 2824 * return an error in the info handler. 2825 */ 2826 2827 r = -EFAULT; 2828 if (copy_from_user(&info, argp, sizeof(info.header))) 2829 break; 2830 2831 r = -EINVAL; 2832 if (info.header.len_max < sizeof(info.header)) 2833 break; 2834 2835 data_len = kvm_s390_handle_pv_info(&info); 2836 if (data_len < 0) { 2837 r = data_len; 2838 break; 2839 } 2840 /* 2841 * If a data command struct is extended (multiple 2842 * times) this can be used to determine how much of it 2843 * is valid. 2844 */ 2845 info.header.len_written = data_len; 2846 2847 r = -EFAULT; 2848 if (copy_to_user(argp, &info, data_len)) 2849 break; 2850 2851 r = 0; 2852 break; 2853 } 2854 case KVM_PV_DUMP: { 2855 struct kvm_s390_pv_dmp dmp; 2856 2857 r = -EINVAL; 2858 if (!kvm_s390_pv_is_protected(kvm)) 2859 break; 2860 2861 r = -EFAULT; 2862 if (copy_from_user(&dmp, argp, sizeof(dmp))) 2863 break; 2864 2865 r = kvm_s390_pv_dmp(kvm, cmd, dmp); 2866 if (r) 2867 break; 2868 2869 if (copy_to_user(argp, &dmp, sizeof(dmp))) { 2870 r = -EFAULT; 2871 break; 2872 } 2873 2874 break; 2875 } 2876 default: 2877 r = -ENOTTY; 2878 } 2879 if (need_lock) 2880 mutex_unlock(&kvm->lock); 2881 2882 return r; 2883} 2884 2885static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_flags) 2886{ 2887 if (mop->flags & ~supported_flags || !mop->size) 2888 return -EINVAL; 2889 if (mop->size > MEM_OP_MAX_SIZE) 2890 return -E2BIG; 2891 if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) { 2892 if (mop->key > 0xf) 2893 return -EINVAL; 2894 } else { 2895 mop->key = 0; 2896 } 2897 return 0; 2898} 2899 2900static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2901{ 2902 void __user *uaddr = (void __user *)mop->buf; 2903 enum gacc_mode acc_mode; 2904 void *tmpbuf = NULL; 2905 int r, srcu_idx; 2906 2907 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION | 2908 KVM_S390_MEMOP_F_CHECK_ONLY); 2909 if (r) 2910 return r; 2911 2912 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 2913 tmpbuf = vmalloc(mop->size); 2914 if (!tmpbuf) 2915 return -ENOMEM; 2916 } 2917 2918 srcu_idx = srcu_read_lock(&kvm->srcu); 2919 2920 if (!kvm_is_gpa_in_memslot(kvm, mop->gaddr)) { 2921 r = PGM_ADDRESSING; 2922 goto out_unlock; 2923 } 2924 2925 acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE; 2926 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 2927 r = check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key); 2928 goto out_unlock; 2929 } 2930 if (acc_mode == GACC_FETCH) { 2931 r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, 2932 mop->size, GACC_FETCH, mop->key); 2933 if (r) 2934 goto out_unlock; 2935 if (copy_to_user(uaddr, tmpbuf, mop->size)) 2936 r = -EFAULT; 2937 } else { 2938 if (copy_from_user(tmpbuf, uaddr, mop->size)) { 2939 r = -EFAULT; 2940 goto out_unlock; 2941 } 2942 r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf, 2943 mop->size, GACC_STORE, mop->key); 2944 } 2945 2946out_unlock: 2947 srcu_read_unlock(&kvm->srcu, srcu_idx); 2948 2949 vfree(tmpbuf); 2950 return r; 2951} 2952 2953static int kvm_s390_vm_mem_op_cmpxchg(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2954{ 2955 void __user *uaddr = (void __user *)mop->buf; 2956 void __user *old_addr = (void __user *)mop->old_addr; 2957 union { 2958 __uint128_t quad; 2959 char raw[sizeof(__uint128_t)]; 2960 } old = { .quad = 0}, new = { .quad = 0 }; 2961 unsigned int off_in_quad = sizeof(new) - mop->size; 2962 int r, srcu_idx; 2963 bool success; 2964 2965 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION); 2966 if (r) 2967 return r; 2968 /* 2969 * This validates off_in_quad. Checking that size is a power 2970 * of two is not necessary, as cmpxchg_guest_abs_with_key 2971 * takes care of that 2972 */ 2973 if (mop->size > sizeof(new)) 2974 return -EINVAL; 2975 if (copy_from_user(&new.raw[off_in_quad], uaddr, mop->size)) 2976 return -EFAULT; 2977 if (copy_from_user(&old.raw[off_in_quad], old_addr, mop->size)) 2978 return -EFAULT; 2979 2980 srcu_idx = srcu_read_lock(&kvm->srcu); 2981 2982 if (!kvm_is_gpa_in_memslot(kvm, mop->gaddr)) { 2983 r = PGM_ADDRESSING; 2984 goto out_unlock; 2985 } 2986 2987 r = cmpxchg_guest_abs_with_key(kvm, mop->gaddr, mop->size, &old.quad, 2988 new.quad, mop->key, &success); 2989 if (!success && copy_to_user(old_addr, &old.raw[off_in_quad], mop->size)) 2990 r = -EFAULT; 2991 2992out_unlock: 2993 srcu_read_unlock(&kvm->srcu, srcu_idx); 2994 return r; 2995} 2996 2997static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop) 2998{ 2999 /* 3000 * This is technically a heuristic only, if the kvm->lock is not 3001 * taken, it is not guaranteed that the vm is/remains non-protected. 3002 * This is ok from a kernel perspective, wrongdoing is detected 3003 * on the access, -EFAULT is returned and the vm may crash the 3004 * next time it accesses the memory in question. 3005 * There is no sane usecase to do switching and a memop on two 3006 * different CPUs at the same time. 3007 */ 3008 if (kvm_s390_pv_get_handle(kvm)) 3009 return -EINVAL; 3010 3011 switch (mop->op) { 3012 case KVM_S390_MEMOP_ABSOLUTE_READ: 3013 case KVM_S390_MEMOP_ABSOLUTE_WRITE: 3014 return kvm_s390_vm_mem_op_abs(kvm, mop); 3015 case KVM_S390_MEMOP_ABSOLUTE_CMPXCHG: 3016 return kvm_s390_vm_mem_op_cmpxchg(kvm, mop); 3017 default: 3018 return -EINVAL; 3019 } 3020} 3021 3022int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) 3023{ 3024 struct kvm *kvm = filp->private_data; 3025 void __user *argp = (void __user *)arg; 3026 struct kvm_device_attr attr; 3027 int r; 3028 3029 switch (ioctl) { 3030 case KVM_S390_INTERRUPT: { 3031 struct kvm_s390_interrupt s390int; 3032 3033 r = -EFAULT; 3034 if (copy_from_user(&s390int, argp, sizeof(s390int))) 3035 break; 3036 r = kvm_s390_inject_vm(kvm, &s390int); 3037 break; 3038 } 3039 case KVM_CREATE_IRQCHIP: { 3040 r = -EINVAL; 3041 if (kvm->arch.use_irqchip) 3042 r = 0; 3043 break; 3044 } 3045 case KVM_SET_DEVICE_ATTR: { 3046 r = -EFAULT; 3047 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 3048 break; 3049 r = kvm_s390_vm_set_attr(kvm, &attr); 3050 break; 3051 } 3052 case KVM_GET_DEVICE_ATTR: { 3053 r = -EFAULT; 3054 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 3055 break; 3056 r = kvm_s390_vm_get_attr(kvm, &attr); 3057 break; 3058 } 3059 case KVM_HAS_DEVICE_ATTR: { 3060 r = -EFAULT; 3061 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) 3062 break; 3063 r = kvm_s390_vm_has_attr(kvm, &attr); 3064 break; 3065 } 3066 case KVM_S390_GET_SKEYS: { 3067 struct kvm_s390_skeys args; 3068 3069 r = -EFAULT; 3070 if (copy_from_user(&args, argp, 3071 sizeof(struct kvm_s390_skeys))) 3072 break; 3073 r = kvm_s390_get_skeys(kvm, &args); 3074 break; 3075 } 3076 case KVM_S390_SET_SKEYS: { 3077 struct kvm_s390_skeys args; 3078 3079 r = -EFAULT; 3080 if (copy_from_user(&args, argp, 3081 sizeof(struct kvm_s390_skeys))) 3082 break; 3083 r = kvm_s390_set_skeys(kvm, &args); 3084 break; 3085 } 3086 case KVM_S390_GET_CMMA_BITS: { 3087 struct kvm_s390_cmma_log args; 3088 3089 r = -EFAULT; 3090 if (copy_from_user(&args, argp, sizeof(args))) 3091 break; 3092 mutex_lock(&kvm->slots_lock); 3093 r = kvm_s390_get_cmma_bits(kvm, &args); 3094 mutex_unlock(&kvm->slots_lock); 3095 if (!r) { 3096 r = copy_to_user(argp, &args, sizeof(args)); 3097 if (r) 3098 r = -EFAULT; 3099 } 3100 break; 3101 } 3102 case KVM_S390_SET_CMMA_BITS: { 3103 struct kvm_s390_cmma_log args; 3104 3105 r = -EFAULT; 3106 if (copy_from_user(&args, argp, sizeof(args))) 3107 break; 3108 mutex_lock(&kvm->slots_lock); 3109 r = kvm_s390_set_cmma_bits(kvm, &args); 3110 mutex_unlock(&kvm->slots_lock); 3111 break; 3112 } 3113 case KVM_S390_PV_COMMAND: { 3114 struct kvm_pv_cmd args; 3115 3116 /* protvirt means user cpu state */ 3117 kvm_s390_set_user_cpu_state_ctrl(kvm); 3118 r = 0; 3119 if (!is_prot_virt_host()) { 3120 r = -EINVAL; 3121 break; 3122 } 3123 if (copy_from_user(&args, argp, sizeof(args))) { 3124 r = -EFAULT; 3125 break; 3126 } 3127 if (args.flags) { 3128 r = -EINVAL; 3129 break; 3130 } 3131 /* must be called without kvm->lock */ 3132 r = kvm_s390_handle_pv(kvm, &args); 3133 if (copy_to_user(argp, &args, sizeof(args))) { 3134 r = -EFAULT; 3135 break; 3136 } 3137 break; 3138 } 3139 case KVM_S390_MEM_OP: { 3140 struct kvm_s390_mem_op mem_op; 3141 3142 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 3143 r = kvm_s390_vm_mem_op(kvm, &mem_op); 3144 else 3145 r = -EFAULT; 3146 break; 3147 } 3148 case KVM_S390_ZPCI_OP: { 3149 struct kvm_s390_zpci_op args; 3150 3151 r = -EINVAL; 3152 if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 3153 break; 3154 if (copy_from_user(&args, argp, sizeof(args))) { 3155 r = -EFAULT; 3156 break; 3157 } 3158 r = kvm_s390_pci_zpci_op(kvm, &args); 3159 break; 3160 } 3161 default: 3162 r = -ENOTTY; 3163 } 3164 3165 return r; 3166} 3167 3168static int kvm_s390_apxa_installed(void) 3169{ 3170 struct ap_config_info info; 3171 3172 if (ap_instructions_available()) { 3173 if (ap_qci(&info) == 0) 3174 return info.apxa; 3175 } 3176 3177 return 0; 3178} 3179 3180/* 3181 * The format of the crypto control block (CRYCB) is specified in the 3 low 3182 * order bits of the CRYCB designation (CRYCBD) field as follows: 3183 * Format 0: Neither the message security assist extension 3 (MSAX3) nor the 3184 * AP extended addressing (APXA) facility are installed. 3185 * Format 1: The APXA facility is not installed but the MSAX3 facility is. 3186 * Format 2: Both the APXA and MSAX3 facilities are installed 3187 */ 3188static void kvm_s390_set_crycb_format(struct kvm *kvm) 3189{ 3190 kvm->arch.crypto.crycbd = virt_to_phys(kvm->arch.crypto.crycb); 3191 3192 /* Clear the CRYCB format bits - i.e., set format 0 by default */ 3193 kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK); 3194 3195 /* Check whether MSAX3 is installed */ 3196 if (!test_kvm_facility(kvm, 76)) 3197 return; 3198 3199 if (kvm_s390_apxa_installed()) 3200 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2; 3201 else 3202 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1; 3203} 3204 3205/* 3206 * kvm_arch_crypto_set_masks 3207 * 3208 * @kvm: pointer to the target guest's KVM struct containing the crypto masks 3209 * to be set. 3210 * @apm: the mask identifying the accessible AP adapters 3211 * @aqm: the mask identifying the accessible AP domains 3212 * @adm: the mask identifying the accessible AP control domains 3213 * 3214 * Set the masks that identify the adapters, domains and control domains to 3215 * which the KVM guest is granted access. 3216 * 3217 * Note: The kvm->lock mutex must be locked by the caller before invoking this 3218 * function. 3219 */ 3220void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm, 3221 unsigned long *aqm, unsigned long *adm) 3222{ 3223 struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb; 3224 3225 kvm_s390_vcpu_block_all(kvm); 3226 3227 switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) { 3228 case CRYCB_FORMAT2: /* APCB1 use 256 bits */ 3229 memcpy(crycb->apcb1.apm, apm, 32); 3230 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx", 3231 apm[0], apm[1], apm[2], apm[3]); 3232 memcpy(crycb->apcb1.aqm, aqm, 32); 3233 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx", 3234 aqm[0], aqm[1], aqm[2], aqm[3]); 3235 memcpy(crycb->apcb1.adm, adm, 32); 3236 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx", 3237 adm[0], adm[1], adm[2], adm[3]); 3238 break; 3239 case CRYCB_FORMAT1: 3240 case CRYCB_FORMAT0: /* Fall through both use APCB0 */ 3241 memcpy(crycb->apcb0.apm, apm, 8); 3242 memcpy(crycb->apcb0.aqm, aqm, 2); 3243 memcpy(crycb->apcb0.adm, adm, 2); 3244 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x", 3245 apm[0], *((unsigned short *)aqm), 3246 *((unsigned short *)adm)); 3247 break; 3248 default: /* Can not happen */ 3249 break; 3250 } 3251 3252 /* recreate the shadow crycb for each vcpu */ 3253 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 3254 kvm_s390_vcpu_unblock_all(kvm); 3255} 3256EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks); 3257 3258/* 3259 * kvm_arch_crypto_clear_masks 3260 * 3261 * @kvm: pointer to the target guest's KVM struct containing the crypto masks 3262 * to be cleared. 3263 * 3264 * Clear the masks that identify the adapters, domains and control domains to 3265 * which the KVM guest is granted access. 3266 * 3267 * Note: The kvm->lock mutex must be locked by the caller before invoking this 3268 * function. 3269 */ 3270void kvm_arch_crypto_clear_masks(struct kvm *kvm) 3271{ 3272 kvm_s390_vcpu_block_all(kvm); 3273 3274 memset(&kvm->arch.crypto.crycb->apcb0, 0, 3275 sizeof(kvm->arch.crypto.crycb->apcb0)); 3276 memset(&kvm->arch.crypto.crycb->apcb1, 0, 3277 sizeof(kvm->arch.crypto.crycb->apcb1)); 3278 3279 VM_EVENT(kvm, 3, "%s", "CLR CRYCB:"); 3280 /* recreate the shadow crycb for each vcpu */ 3281 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART); 3282 kvm_s390_vcpu_unblock_all(kvm); 3283} 3284EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks); 3285 3286static u64 kvm_s390_get_initial_cpuid(void) 3287{ 3288 struct cpuid cpuid; 3289 3290 get_cpu_id(&cpuid); 3291 cpuid.version = 0xff; 3292 return *((u64 *) &cpuid); 3293} 3294 3295static void kvm_s390_crypto_init(struct kvm *kvm) 3296{ 3297 kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb; 3298 kvm_s390_set_crycb_format(kvm); 3299 init_rwsem(&kvm->arch.crypto.pqap_hook_rwsem); 3300 3301 if (!test_kvm_facility(kvm, 76)) 3302 return; 3303 3304 /* Enable AES/DEA protected key functions by default */ 3305 kvm->arch.crypto.aes_kw = 1; 3306 kvm->arch.crypto.dea_kw = 1; 3307 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 3308 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask)); 3309 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 3310 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask)); 3311} 3312 3313static void sca_dispose(struct kvm *kvm) 3314{ 3315 free_pages_exact(kvm->arch.sca, sizeof(*kvm->arch.sca)); 3316 kvm->arch.sca = NULL; 3317} 3318 3319void kvm_arch_free_vm(struct kvm *kvm) 3320{ 3321 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) 3322 kvm_s390_pci_clear_list(kvm); 3323 3324 __kvm_arch_free_vm(kvm); 3325} 3326 3327int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 3328{ 3329 gfp_t alloc_flags = GFP_KERNEL_ACCOUNT | __GFP_ZERO; 3330 char debug_name[16]; 3331 int i, rc; 3332 3333 rc = -EINVAL; 3334#ifdef CONFIG_KVM_S390_UCONTROL 3335 if (type & ~KVM_VM_S390_UCONTROL) 3336 goto out_err; 3337 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) 3338 goto out_err; 3339#else 3340 if (type) 3341 goto out_err; 3342#endif 3343 3344 rc = s390_enable_sie(); 3345 if (rc) 3346 goto out_err; 3347 3348 rc = -ENOMEM; 3349 3350 if (!sclp.has_64bscao) 3351 alloc_flags |= GFP_DMA; 3352 mutex_lock(&kvm_lock); 3353 3354 kvm->arch.sca = alloc_pages_exact(sizeof(*kvm->arch.sca), alloc_flags); 3355 mutex_unlock(&kvm_lock); 3356 if (!kvm->arch.sca) 3357 goto out_err; 3358 3359 snprintf(debug_name, sizeof(debug_name), "kvm-%u", current->pid); 3360 3361 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long)); 3362 if (!kvm->arch.dbf) 3363 goto out_err; 3364 3365 BUILD_BUG_ON(sizeof(struct sie_page2) != 4096); 3366 kvm->arch.sie_page2 = 3367 (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA); 3368 if (!kvm->arch.sie_page2) 3369 goto out_err; 3370 3371 kvm->arch.sie_page2->kvm = kvm; 3372 kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list; 3373 3374 for (i = 0; i < kvm_s390_fac_size(); i++) { 3375 kvm->arch.model.fac_mask[i] = stfle_fac_list[i] & 3376 (kvm_s390_fac_base[i] | 3377 kvm_s390_fac_ext[i]); 3378 kvm->arch.model.fac_list[i] = stfle_fac_list[i] & 3379 kvm_s390_fac_base[i]; 3380 } 3381 kvm->arch.model.subfuncs = kvm_s390_available_subfunc; 3382 3383 /* we are always in czam mode - even on pre z14 machines */ 3384 set_kvm_facility(kvm->arch.model.fac_mask, 138); 3385 set_kvm_facility(kvm->arch.model.fac_list, 138); 3386 /* we emulate STHYI in kvm */ 3387 set_kvm_facility(kvm->arch.model.fac_mask, 74); 3388 set_kvm_facility(kvm->arch.model.fac_list, 74); 3389 if (machine_has_tlb_guest()) { 3390 set_kvm_facility(kvm->arch.model.fac_mask, 147); 3391 set_kvm_facility(kvm->arch.model.fac_list, 147); 3392 } 3393 3394 if (css_general_characteristics.aiv && test_facility(65)) 3395 set_kvm_facility(kvm->arch.model.fac_mask, 65); 3396 3397 kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid(); 3398 kvm->arch.model.ibc = sclp.ibc & 0x0fff; 3399 3400 kvm->arch.model.uv_feat_guest.feat = 0; 3401 3402 kvm_s390_crypto_init(kvm); 3403 3404 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) { 3405 mutex_lock(&kvm->lock); 3406 kvm_s390_pci_init_list(kvm); 3407 kvm_s390_vcpu_pci_enable_interp(kvm); 3408 mutex_unlock(&kvm->lock); 3409 } 3410 3411 mutex_init(&kvm->arch.float_int.ais_lock); 3412 spin_lock_init(&kvm->arch.float_int.lock); 3413 for (i = 0; i < FIRQ_LIST_COUNT; i++) 3414 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); 3415 init_waitqueue_head(&kvm->arch.ipte_wq); 3416 mutex_init(&kvm->arch.ipte_mutex); 3417 3418 debug_register_view(kvm->arch.dbf, &debug_sprintf_view); 3419 VM_EVENT(kvm, 3, "vm created with type %lu", type); 3420 3421 if (type & KVM_VM_S390_UCONTROL) { 3422 struct kvm_userspace_memory_region2 fake_memslot = { 3423 .slot = KVM_S390_UCONTROL_MEMSLOT, 3424 .guest_phys_addr = 0, 3425 .userspace_addr = 0, 3426 .memory_size = ALIGN_DOWN(TASK_SIZE, _SEGMENT_SIZE), 3427 .flags = 0, 3428 }; 3429 3430 kvm->arch.gmap = NULL; 3431 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT; 3432 /* one flat fake memslot covering the whole address-space */ 3433 mutex_lock(&kvm->slots_lock); 3434 KVM_BUG_ON(kvm_set_internal_memslot(kvm, &fake_memslot), kvm); 3435 mutex_unlock(&kvm->slots_lock); 3436 } else { 3437 if (sclp.hamax == U64_MAX) 3438 kvm->arch.mem_limit = TASK_SIZE_MAX; 3439 else 3440 kvm->arch.mem_limit = min_t(unsigned long, TASK_SIZE_MAX, 3441 sclp.hamax + 1); 3442 kvm->arch.gmap = gmap_create(current->mm, kvm->arch.mem_limit - 1); 3443 if (!kvm->arch.gmap) 3444 goto out_err; 3445 kvm->arch.gmap->private = kvm; 3446 kvm->arch.gmap->pfault_enabled = 0; 3447 } 3448 3449 kvm->arch.use_pfmfi = sclp.has_pfmfi; 3450 kvm->arch.use_skf = sclp.has_skey; 3451 spin_lock_init(&kvm->arch.start_stop_lock); 3452 kvm_s390_vsie_init(kvm); 3453 if (use_gisa) 3454 kvm_s390_gisa_init(kvm); 3455 INIT_LIST_HEAD(&kvm->arch.pv.need_cleanup); 3456 kvm->arch.pv.set_aside = NULL; 3457 KVM_EVENT(3, "vm 0x%p created by pid %u", kvm, current->pid); 3458 3459 return 0; 3460out_err: 3461 free_page((unsigned long)kvm->arch.sie_page2); 3462 debug_unregister(kvm->arch.dbf); 3463 sca_dispose(kvm); 3464 KVM_EVENT(3, "creation of vm failed: %d", rc); 3465 return rc; 3466} 3467 3468void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 3469{ 3470 u16 rc, rrc; 3471 3472 VCPU_EVENT(vcpu, 3, "%s", "free cpu"); 3473 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); 3474 kvm_s390_clear_local_irqs(vcpu); 3475 kvm_clear_async_pf_completion_queue(vcpu); 3476 if (!kvm_is_ucontrol(vcpu->kvm)) 3477 sca_del_vcpu(vcpu); 3478 kvm_s390_update_topology_change_report(vcpu->kvm, 1); 3479 3480 if (kvm_is_ucontrol(vcpu->kvm)) 3481 gmap_remove(vcpu->arch.gmap); 3482 3483 if (vcpu->kvm->arch.use_cmma) 3484 kvm_s390_vcpu_unsetup_cmma(vcpu); 3485 /* We can not hold the vcpu mutex here, we are already dying */ 3486 if (kvm_s390_pv_cpu_get_handle(vcpu)) 3487 kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc); 3488 free_page((unsigned long)(vcpu->arch.sie_block)); 3489} 3490 3491void kvm_arch_destroy_vm(struct kvm *kvm) 3492{ 3493 u16 rc, rrc; 3494 3495 kvm_destroy_vcpus(kvm); 3496 sca_dispose(kvm); 3497 kvm_s390_gisa_destroy(kvm); 3498 /* 3499 * We are already at the end of life and kvm->lock is not taken. 3500 * This is ok as the file descriptor is closed by now and nobody 3501 * can mess with the pv state. 3502 */ 3503 kvm_s390_pv_deinit_cleanup_all(kvm, &rc, &rrc); 3504 /* 3505 * Remove the mmu notifier only when the whole KVM VM is torn down, 3506 * and only if one was registered to begin with. If the VM is 3507 * currently not protected, but has been previously been protected, 3508 * then it's possible that the notifier is still registered. 3509 */ 3510 if (kvm->arch.pv.mmu_notifier.ops) 3511 mmu_notifier_unregister(&kvm->arch.pv.mmu_notifier, kvm->mm); 3512 3513 debug_unregister(kvm->arch.dbf); 3514 free_page((unsigned long)kvm->arch.sie_page2); 3515 if (!kvm_is_ucontrol(kvm)) 3516 gmap_remove(kvm->arch.gmap); 3517 kvm_s390_destroy_adapters(kvm); 3518 kvm_s390_clear_float_irqs(kvm); 3519 kvm_s390_vsie_destroy(kvm); 3520 KVM_EVENT(3, "vm 0x%p destroyed", kvm); 3521} 3522 3523/* Section: vcpu related */ 3524static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu) 3525{ 3526 vcpu->arch.gmap = gmap_create(current->mm, -1UL); 3527 if (!vcpu->arch.gmap) 3528 return -ENOMEM; 3529 vcpu->arch.gmap->private = vcpu->kvm; 3530 3531 return 0; 3532} 3533 3534static void sca_del_vcpu(struct kvm_vcpu *vcpu) 3535{ 3536 struct esca_block *sca = vcpu->kvm->arch.sca; 3537 3538 if (!kvm_s390_use_sca_entries()) 3539 return; 3540 3541 clear_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn); 3542 sca->cpu[vcpu->vcpu_id].sda = 0; 3543} 3544 3545static void sca_add_vcpu(struct kvm_vcpu *vcpu) 3546{ 3547 struct esca_block *sca = vcpu->kvm->arch.sca; 3548 phys_addr_t sca_phys = virt_to_phys(sca); 3549 3550 /* we still need the sca header for the ipte control */ 3551 vcpu->arch.sie_block->scaoh = sca_phys >> 32; 3552 vcpu->arch.sie_block->scaol = sca_phys & ESCA_SCAOL_MASK; 3553 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA; 3554 3555 if (!kvm_s390_use_sca_entries()) 3556 return; 3557 3558 set_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn); 3559 sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block); 3560} 3561 3562static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id) 3563{ 3564 if (!kvm_s390_use_sca_entries()) 3565 return id < KVM_MAX_VCPUS; 3566 3567 return id < KVM_S390_ESCA_CPU_SLOTS; 3568} 3569 3570/* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3571static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3572{ 3573 WARN_ON_ONCE(vcpu->arch.cputm_start != 0); 3574 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3575 vcpu->arch.cputm_start = get_tod_clock_fast(); 3576 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3577} 3578 3579/* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3580static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3581{ 3582 WARN_ON_ONCE(vcpu->arch.cputm_start == 0); 3583 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3584 vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start; 3585 vcpu->arch.cputm_start = 0; 3586 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3587} 3588 3589/* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3590static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3591{ 3592 WARN_ON_ONCE(vcpu->arch.cputm_enabled); 3593 vcpu->arch.cputm_enabled = true; 3594 __start_cpu_timer_accounting(vcpu); 3595} 3596 3597/* needs disabled preemption to protect from TOD sync and vcpu_load/put */ 3598static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3599{ 3600 WARN_ON_ONCE(!vcpu->arch.cputm_enabled); 3601 __stop_cpu_timer_accounting(vcpu); 3602 vcpu->arch.cputm_enabled = false; 3603} 3604 3605static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3606{ 3607 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3608 __enable_cpu_timer_accounting(vcpu); 3609 preempt_enable(); 3610} 3611 3612static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu) 3613{ 3614 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3615 __disable_cpu_timer_accounting(vcpu); 3616 preempt_enable(); 3617} 3618 3619/* set the cpu timer - may only be called from the VCPU thread itself */ 3620void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm) 3621{ 3622 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3623 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount); 3624 if (vcpu->arch.cputm_enabled) 3625 vcpu->arch.cputm_start = get_tod_clock_fast(); 3626 vcpu->arch.sie_block->cputm = cputm; 3627 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount); 3628 preempt_enable(); 3629} 3630 3631/* update and get the cpu timer - can also be called from other VCPU threads */ 3632__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu) 3633{ 3634 unsigned int seq; 3635 __u64 value; 3636 3637 if (unlikely(!vcpu->arch.cputm_enabled)) 3638 return vcpu->arch.sie_block->cputm; 3639 3640 preempt_disable(); /* protect from TOD sync and vcpu_load/put */ 3641 do { 3642 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount); 3643 /* 3644 * If the writer would ever execute a read in the critical 3645 * section, e.g. in irq context, we have a deadlock. 3646 */ 3647 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu); 3648 value = vcpu->arch.sie_block->cputm; 3649 /* if cputm_start is 0, accounting is being started/stopped */ 3650 if (likely(vcpu->arch.cputm_start)) 3651 value -= get_tod_clock_fast() - vcpu->arch.cputm_start; 3652 } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1)); 3653 preempt_enable(); 3654 return value; 3655} 3656 3657void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 3658{ 3659 3660 kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING); 3661 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 3662 __start_cpu_timer_accounting(vcpu); 3663 vcpu->cpu = cpu; 3664} 3665 3666void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 3667{ 3668 vcpu->cpu = -1; 3669 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu)) 3670 __stop_cpu_timer_accounting(vcpu); 3671 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING); 3672 3673} 3674 3675void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 3676{ 3677 mutex_lock(&vcpu->kvm->lock); 3678 preempt_disable(); 3679 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch; 3680 vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx; 3681 preempt_enable(); 3682 mutex_unlock(&vcpu->kvm->lock); 3683 if (!kvm_is_ucontrol(vcpu->kvm)) { 3684 vcpu->arch.gmap = vcpu->kvm->arch.gmap; 3685 sca_add_vcpu(vcpu); 3686 } 3687 if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0) 3688 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 3689} 3690 3691static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr) 3692{ 3693 if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) && 3694 test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo)) 3695 return true; 3696 return false; 3697} 3698 3699static bool kvm_has_pckmo_ecc(struct kvm *kvm) 3700{ 3701 /* At least one ECC subfunction must be present */ 3702 return kvm_has_pckmo_subfunc(kvm, 32) || 3703 kvm_has_pckmo_subfunc(kvm, 33) || 3704 kvm_has_pckmo_subfunc(kvm, 34) || 3705 kvm_has_pckmo_subfunc(kvm, 40) || 3706 kvm_has_pckmo_subfunc(kvm, 41); 3707 3708} 3709 3710static bool kvm_has_pckmo_hmac(struct kvm *kvm) 3711{ 3712 /* At least one HMAC subfunction must be present */ 3713 return kvm_has_pckmo_subfunc(kvm, 118) || 3714 kvm_has_pckmo_subfunc(kvm, 122); 3715} 3716 3717static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu) 3718{ 3719 /* 3720 * If the AP instructions are not being interpreted and the MSAX3 3721 * facility is not configured for the guest, there is nothing to set up. 3722 */ 3723 if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76)) 3724 return; 3725 3726 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd; 3727 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA); 3728 vcpu->arch.sie_block->eca &= ~ECA_APIE; 3729 vcpu->arch.sie_block->ecd &= ~(ECD_ECC | ECD_HMAC); 3730 3731 if (vcpu->kvm->arch.crypto.apie) 3732 vcpu->arch.sie_block->eca |= ECA_APIE; 3733 3734 /* Set up protected key support */ 3735 if (vcpu->kvm->arch.crypto.aes_kw) { 3736 vcpu->arch.sie_block->ecb3 |= ECB3_AES; 3737 /* ecc/hmac is also wrapped with AES key */ 3738 if (kvm_has_pckmo_ecc(vcpu->kvm)) 3739 vcpu->arch.sie_block->ecd |= ECD_ECC; 3740 if (kvm_has_pckmo_hmac(vcpu->kvm)) 3741 vcpu->arch.sie_block->ecd |= ECD_HMAC; 3742 } 3743 3744 if (vcpu->kvm->arch.crypto.dea_kw) 3745 vcpu->arch.sie_block->ecb3 |= ECB3_DEA; 3746} 3747 3748void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) 3749{ 3750 free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo)); 3751 vcpu->arch.sie_block->cbrlo = 0; 3752} 3753 3754int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) 3755{ 3756 void *cbrlo_page = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT); 3757 3758 if (!cbrlo_page) 3759 return -ENOMEM; 3760 3761 vcpu->arch.sie_block->cbrlo = virt_to_phys(cbrlo_page); 3762 return 0; 3763} 3764 3765static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu) 3766{ 3767 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model; 3768 3769 vcpu->arch.sie_block->ibc = model->ibc; 3770 if (test_kvm_facility(vcpu->kvm, 7)) 3771 vcpu->arch.sie_block->fac = virt_to_phys(model->fac_list); 3772} 3773 3774static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu) 3775{ 3776 int rc = 0; 3777 u16 uvrc, uvrrc; 3778 3779 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | 3780 CPUSTAT_SM | 3781 CPUSTAT_STOPPED); 3782 3783 if (test_kvm_facility(vcpu->kvm, 78)) 3784 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2); 3785 else if (test_kvm_facility(vcpu->kvm, 8)) 3786 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED); 3787 3788 kvm_s390_vcpu_setup_model(vcpu); 3789 3790 /* pgste_set_pte has special handling for !machine_has_esop() */ 3791 if (machine_has_esop()) 3792 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT; 3793 if (test_kvm_facility(vcpu->kvm, 9)) 3794 vcpu->arch.sie_block->ecb |= ECB_SRSI; 3795 if (test_kvm_facility(vcpu->kvm, 11)) 3796 vcpu->arch.sie_block->ecb |= ECB_PTF; 3797 if (test_kvm_facility(vcpu->kvm, 73)) 3798 vcpu->arch.sie_block->ecb |= ECB_TE; 3799 if (!kvm_is_ucontrol(vcpu->kvm)) 3800 vcpu->arch.sie_block->ecb |= ECB_SPECI; 3801 3802 if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi) 3803 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI; 3804 if (test_kvm_facility(vcpu->kvm, 130)) 3805 vcpu->arch.sie_block->ecb2 |= ECB2_IEP; 3806 vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI; 3807 if (sclp.has_cei) 3808 vcpu->arch.sie_block->eca |= ECA_CEI; 3809 if (sclp.has_ib) 3810 vcpu->arch.sie_block->eca |= ECA_IB; 3811 if (sclp.has_siif) 3812 vcpu->arch.sie_block->eca |= ECA_SII; 3813 if (kvm_s390_use_sca_entries()) 3814 vcpu->arch.sie_block->eca |= ECA_SIGPI; 3815 if (test_kvm_facility(vcpu->kvm, 129)) { 3816 vcpu->arch.sie_block->eca |= ECA_VX; 3817 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 3818 } 3819 if (test_kvm_facility(vcpu->kvm, 139)) 3820 vcpu->arch.sie_block->ecd |= ECD_MEF; 3821 if (test_kvm_facility(vcpu->kvm, 156)) 3822 vcpu->arch.sie_block->ecd |= ECD_ETOKENF; 3823 if (vcpu->arch.sie_block->gd) { 3824 vcpu->arch.sie_block->eca |= ECA_AIV; 3825 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u", 3826 vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id); 3827 } 3828 vcpu->arch.sie_block->sdnxo = virt_to_phys(&vcpu->run->s.regs.sdnx) | SDNXC; 3829 vcpu->arch.sie_block->riccbd = virt_to_phys(&vcpu->run->s.regs.riccb); 3830 3831 if (sclp.has_kss) 3832 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS); 3833 else 3834 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; 3835 3836 if (vcpu->kvm->arch.use_cmma) { 3837 rc = kvm_s390_vcpu_setup_cmma(vcpu); 3838 if (rc) 3839 return rc; 3840 } 3841 hrtimer_setup(&vcpu->arch.ckc_timer, kvm_s390_idle_wakeup, CLOCK_MONOTONIC, 3842 HRTIMER_MODE_REL); 3843 3844 vcpu->arch.sie_block->hpid = HPID_KVM; 3845 3846 kvm_s390_vcpu_crypto_setup(vcpu); 3847 3848 kvm_s390_vcpu_pci_setup(vcpu); 3849 3850 mutex_lock(&vcpu->kvm->lock); 3851 if (kvm_s390_pv_is_protected(vcpu->kvm)) { 3852 rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc); 3853 if (rc) 3854 kvm_s390_vcpu_unsetup_cmma(vcpu); 3855 } 3856 mutex_unlock(&vcpu->kvm->lock); 3857 3858 return rc; 3859} 3860 3861int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) 3862{ 3863 if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id)) 3864 return -EINVAL; 3865 return 0; 3866} 3867 3868int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) 3869{ 3870 struct sie_page *sie_page; 3871 int rc; 3872 3873 BUILD_BUG_ON(sizeof(struct sie_page) != 4096); 3874 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT); 3875 if (!sie_page) 3876 return -ENOMEM; 3877 3878 vcpu->arch.sie_block = &sie_page->sie_block; 3879 vcpu->arch.sie_block->itdba = virt_to_phys(&sie_page->itdb); 3880 3881 /* the real guest size will always be smaller than msl */ 3882 vcpu->arch.sie_block->mso = 0; 3883 vcpu->arch.sie_block->msl = sclp.hamax; 3884 3885 vcpu->arch.sie_block->icpua = vcpu->vcpu_id; 3886 spin_lock_init(&vcpu->arch.local_int.lock); 3887 vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm); 3888 seqcount_init(&vcpu->arch.cputm_seqcount); 3889 3890 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 3891 kvm_clear_async_pf_completion_queue(vcpu); 3892 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | 3893 KVM_SYNC_GPRS | 3894 KVM_SYNC_ACRS | 3895 KVM_SYNC_CRS | 3896 KVM_SYNC_ARCH0 | 3897 KVM_SYNC_PFAULT | 3898 KVM_SYNC_DIAG318; 3899 vcpu->arch.acrs_loaded = false; 3900 kvm_s390_set_prefix(vcpu, 0); 3901 if (test_kvm_facility(vcpu->kvm, 64)) 3902 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB; 3903 if (test_kvm_facility(vcpu->kvm, 82)) 3904 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC; 3905 if (test_kvm_facility(vcpu->kvm, 133)) 3906 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB; 3907 if (test_kvm_facility(vcpu->kvm, 156)) 3908 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN; 3909 /* fprs can be synchronized via vrs, even if the guest has no vx. With 3910 * cpu_has_vx(), (load|store)_fpu_regs() will work with vrs format. 3911 */ 3912 if (cpu_has_vx()) 3913 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS; 3914 else 3915 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS; 3916 3917 if (kvm_is_ucontrol(vcpu->kvm)) { 3918 rc = __kvm_ucontrol_vcpu_init(vcpu); 3919 if (rc) 3920 goto out_free_sie_block; 3921 } 3922 3923 VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%p, sie block at 0x%p", 3924 vcpu->vcpu_id, vcpu, vcpu->arch.sie_block); 3925 trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block); 3926 3927 rc = kvm_s390_vcpu_setup(vcpu); 3928 if (rc) 3929 goto out_ucontrol_uninit; 3930 3931 kvm_s390_update_topology_change_report(vcpu->kvm, 1); 3932 return 0; 3933 3934out_ucontrol_uninit: 3935 if (kvm_is_ucontrol(vcpu->kvm)) 3936 gmap_remove(vcpu->arch.gmap); 3937out_free_sie_block: 3938 free_page((unsigned long)(vcpu->arch.sie_block)); 3939 return rc; 3940} 3941 3942int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) 3943{ 3944 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask); 3945 return kvm_s390_vcpu_has_irq(vcpu, 0); 3946} 3947 3948bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 3949{ 3950 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE); 3951} 3952 3953void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu) 3954{ 3955 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3956 exit_sie(vcpu); 3957} 3958 3959void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu) 3960{ 3961 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); 3962} 3963 3964static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu) 3965{ 3966 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3967 exit_sie(vcpu); 3968} 3969 3970bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu) 3971{ 3972 return atomic_read(&vcpu->arch.sie_block->prog20) & 3973 (PROG_BLOCK_SIE | PROG_REQUEST); 3974} 3975 3976static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu) 3977{ 3978 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20); 3979} 3980 3981/* 3982 * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running. 3983 * If the CPU is not running (e.g. waiting as idle) the function will 3984 * return immediately. */ 3985void exit_sie(struct kvm_vcpu *vcpu) 3986{ 3987 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT); 3988 kvm_s390_vsie_kick(vcpu); 3989 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) 3990 cpu_relax(); 3991} 3992 3993/* Kick a guest cpu out of SIE to process a request synchronously */ 3994void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu) 3995{ 3996 __kvm_make_request(req, vcpu); 3997 kvm_s390_vcpu_request(vcpu); 3998} 3999 4000static void kvm_gmap_notifier(struct gmap *gmap, unsigned long start, 4001 unsigned long end) 4002{ 4003 struct kvm *kvm = gmap->private; 4004 struct kvm_vcpu *vcpu; 4005 unsigned long prefix; 4006 unsigned long i; 4007 4008 trace_kvm_s390_gmap_notifier(start, end, gmap_is_shadow(gmap)); 4009 4010 if (gmap_is_shadow(gmap)) 4011 return; 4012 if (start >= 1UL << 31) 4013 /* We are only interested in prefix pages */ 4014 return; 4015 kvm_for_each_vcpu(i, vcpu, kvm) { 4016 /* match against both prefix pages */ 4017 prefix = kvm_s390_get_prefix(vcpu); 4018 if (prefix <= end && start <= prefix + 2*PAGE_SIZE - 1) { 4019 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx-%lx", 4020 start, end); 4021 kvm_s390_sync_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu); 4022 } 4023 } 4024} 4025 4026bool kvm_arch_no_poll(struct kvm_vcpu *vcpu) 4027{ 4028 /* do not poll with more than halt_poll_max_steal percent of steal time */ 4029 if (get_lowcore()->avg_steal_timer * 100 / (TICK_USEC << 12) >= 4030 READ_ONCE(halt_poll_max_steal)) { 4031 vcpu->stat.halt_no_poll_steal++; 4032 return true; 4033 } 4034 return false; 4035} 4036 4037int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 4038{ 4039 /* kvm common code refers to this, but never calls it */ 4040 BUG(); 4041 return 0; 4042} 4043 4044static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, 4045 struct kvm_one_reg *reg) 4046{ 4047 int r = -EINVAL; 4048 4049 switch (reg->id) { 4050 case KVM_REG_S390_TODPR: 4051 r = put_user(vcpu->arch.sie_block->todpr, 4052 (u32 __user *)reg->addr); 4053 break; 4054 case KVM_REG_S390_EPOCHDIFF: 4055 r = put_user(vcpu->arch.sie_block->epoch, 4056 (u64 __user *)reg->addr); 4057 break; 4058 case KVM_REG_S390_CPU_TIMER: 4059 r = put_user(kvm_s390_get_cpu_timer(vcpu), 4060 (u64 __user *)reg->addr); 4061 break; 4062 case KVM_REG_S390_CLOCK_COMP: 4063 r = put_user(vcpu->arch.sie_block->ckc, 4064 (u64 __user *)reg->addr); 4065 break; 4066 case KVM_REG_S390_PFTOKEN: 4067 r = put_user(vcpu->arch.pfault_token, 4068 (u64 __user *)reg->addr); 4069 break; 4070 case KVM_REG_S390_PFCOMPARE: 4071 r = put_user(vcpu->arch.pfault_compare, 4072 (u64 __user *)reg->addr); 4073 break; 4074 case KVM_REG_S390_PFSELECT: 4075 r = put_user(vcpu->arch.pfault_select, 4076 (u64 __user *)reg->addr); 4077 break; 4078 case KVM_REG_S390_PP: 4079 r = put_user(vcpu->arch.sie_block->pp, 4080 (u64 __user *)reg->addr); 4081 break; 4082 case KVM_REG_S390_GBEA: 4083 r = put_user(vcpu->arch.sie_block->gbea, 4084 (u64 __user *)reg->addr); 4085 break; 4086 default: 4087 break; 4088 } 4089 4090 return r; 4091} 4092 4093static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, 4094 struct kvm_one_reg *reg) 4095{ 4096 int r = -EINVAL; 4097 __u64 val; 4098 4099 switch (reg->id) { 4100 case KVM_REG_S390_TODPR: 4101 r = get_user(vcpu->arch.sie_block->todpr, 4102 (u32 __user *)reg->addr); 4103 break; 4104 case KVM_REG_S390_EPOCHDIFF: 4105 r = get_user(vcpu->arch.sie_block->epoch, 4106 (u64 __user *)reg->addr); 4107 break; 4108 case KVM_REG_S390_CPU_TIMER: 4109 r = get_user(val, (u64 __user *)reg->addr); 4110 if (!r) 4111 kvm_s390_set_cpu_timer(vcpu, val); 4112 break; 4113 case KVM_REG_S390_CLOCK_COMP: 4114 r = get_user(vcpu->arch.sie_block->ckc, 4115 (u64 __user *)reg->addr); 4116 break; 4117 case KVM_REG_S390_PFTOKEN: 4118 r = get_user(vcpu->arch.pfault_token, 4119 (u64 __user *)reg->addr); 4120 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 4121 kvm_clear_async_pf_completion_queue(vcpu); 4122 break; 4123 case KVM_REG_S390_PFCOMPARE: 4124 r = get_user(vcpu->arch.pfault_compare, 4125 (u64 __user *)reg->addr); 4126 break; 4127 case KVM_REG_S390_PFSELECT: 4128 r = get_user(vcpu->arch.pfault_select, 4129 (u64 __user *)reg->addr); 4130 break; 4131 case KVM_REG_S390_PP: 4132 r = get_user(vcpu->arch.sie_block->pp, 4133 (u64 __user *)reg->addr); 4134 break; 4135 case KVM_REG_S390_GBEA: 4136 r = get_user(vcpu->arch.sie_block->gbea, 4137 (u64 __user *)reg->addr); 4138 break; 4139 default: 4140 break; 4141 } 4142 4143 return r; 4144} 4145 4146static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu) 4147{ 4148 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI; 4149 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; 4150 memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb)); 4151 4152 kvm_clear_async_pf_completion_queue(vcpu); 4153 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) 4154 kvm_s390_vcpu_stop(vcpu); 4155 kvm_s390_clear_local_irqs(vcpu); 4156} 4157 4158static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) 4159{ 4160 /* Initial reset is a superset of the normal reset */ 4161 kvm_arch_vcpu_ioctl_normal_reset(vcpu); 4162 4163 /* 4164 * This equals initial cpu reset in pop, but we don't switch to ESA. 4165 * We do not only reset the internal data, but also ... 4166 */ 4167 vcpu->arch.sie_block->gpsw.mask = 0; 4168 vcpu->arch.sie_block->gpsw.addr = 0; 4169 kvm_s390_set_prefix(vcpu, 0); 4170 kvm_s390_set_cpu_timer(vcpu, 0); 4171 vcpu->arch.sie_block->ckc = 0; 4172 memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); 4173 vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; 4174 vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; 4175 4176 /* ... the data in sync regs */ 4177 memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs)); 4178 vcpu->run->s.regs.ckc = 0; 4179 vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK; 4180 vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK; 4181 vcpu->run->psw_addr = 0; 4182 vcpu->run->psw_mask = 0; 4183 vcpu->run->s.regs.todpr = 0; 4184 vcpu->run->s.regs.cputm = 0; 4185 vcpu->run->s.regs.ckc = 0; 4186 vcpu->run->s.regs.pp = 0; 4187 vcpu->run->s.regs.gbea = 1; 4188 vcpu->run->s.regs.fpc = 0; 4189 /* 4190 * Do not reset these registers in the protected case, as some of 4191 * them are overlaid and they are not accessible in this case 4192 * anyway. 4193 */ 4194 if (!kvm_s390_pv_cpu_is_protected(vcpu)) { 4195 vcpu->arch.sie_block->gbea = 1; 4196 vcpu->arch.sie_block->pp = 0; 4197 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 4198 vcpu->arch.sie_block->todpr = 0; 4199 } 4200} 4201 4202static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu) 4203{ 4204 struct kvm_sync_regs *regs = &vcpu->run->s.regs; 4205 4206 /* Clear reset is a superset of the initial reset */ 4207 kvm_arch_vcpu_ioctl_initial_reset(vcpu); 4208 4209 memset(®s->gprs, 0, sizeof(regs->gprs)); 4210 memset(®s->vrs, 0, sizeof(regs->vrs)); 4211 memset(®s->acrs, 0, sizeof(regs->acrs)); 4212 memset(®s->gscb, 0, sizeof(regs->gscb)); 4213 4214 regs->etoken = 0; 4215 regs->etoken_extension = 0; 4216} 4217 4218int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 4219{ 4220 vcpu_load(vcpu); 4221 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); 4222 vcpu_put(vcpu); 4223 return 0; 4224} 4225 4226int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) 4227{ 4228 vcpu_load(vcpu); 4229 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); 4230 vcpu_put(vcpu); 4231 return 0; 4232} 4233 4234int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, 4235 struct kvm_sregs *sregs) 4236{ 4237 vcpu_load(vcpu); 4238 4239 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); 4240 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); 4241 4242 vcpu_put(vcpu); 4243 return 0; 4244} 4245 4246int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, 4247 struct kvm_sregs *sregs) 4248{ 4249 vcpu_load(vcpu); 4250 4251 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); 4252 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); 4253 4254 vcpu_put(vcpu); 4255 return 0; 4256} 4257 4258int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 4259{ 4260 vcpu_load(vcpu); 4261 4262 vcpu->run->s.regs.fpc = fpu->fpc; 4263 if (cpu_has_vx()) 4264 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs, 4265 (freg_t *) fpu->fprs); 4266 else 4267 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs)); 4268 4269 vcpu_put(vcpu); 4270 return 0; 4271} 4272 4273int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) 4274{ 4275 vcpu_load(vcpu); 4276 4277 if (cpu_has_vx()) 4278 convert_vx_to_fp((freg_t *) fpu->fprs, 4279 (__vector128 *) vcpu->run->s.regs.vrs); 4280 else 4281 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs)); 4282 fpu->fpc = vcpu->run->s.regs.fpc; 4283 4284 vcpu_put(vcpu); 4285 return 0; 4286} 4287 4288static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) 4289{ 4290 int rc = 0; 4291 4292 if (!is_vcpu_stopped(vcpu)) 4293 rc = -EBUSY; 4294 else { 4295 vcpu->run->psw_mask = psw.mask; 4296 vcpu->run->psw_addr = psw.addr; 4297 } 4298 return rc; 4299} 4300 4301int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, 4302 struct kvm_translation *tr) 4303{ 4304 return -EINVAL; /* not implemented yet */ 4305} 4306 4307#define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ 4308 KVM_GUESTDBG_USE_HW_BP | \ 4309 KVM_GUESTDBG_ENABLE) 4310 4311int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, 4312 struct kvm_guest_debug *dbg) 4313{ 4314 int rc = 0; 4315 4316 vcpu_load(vcpu); 4317 4318 vcpu->guest_debug = 0; 4319 kvm_s390_clear_bp_data(vcpu); 4320 4321 if (dbg->control & ~VALID_GUESTDBG_FLAGS) { 4322 rc = -EINVAL; 4323 goto out; 4324 } 4325 if (!sclp.has_gpere) { 4326 rc = -EINVAL; 4327 goto out; 4328 } 4329 4330 if (dbg->control & KVM_GUESTDBG_ENABLE) { 4331 vcpu->guest_debug = dbg->control; 4332 /* enforce guest PER */ 4333 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P); 4334 4335 if (dbg->control & KVM_GUESTDBG_USE_HW_BP) 4336 rc = kvm_s390_import_bp_data(vcpu, dbg); 4337 } else { 4338 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 4339 vcpu->arch.guestdbg.last_bp = 0; 4340 } 4341 4342 if (rc) { 4343 vcpu->guest_debug = 0; 4344 kvm_s390_clear_bp_data(vcpu); 4345 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P); 4346 } 4347 4348out: 4349 vcpu_put(vcpu); 4350 return rc; 4351} 4352 4353int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 4354 struct kvm_mp_state *mp_state) 4355{ 4356 int ret; 4357 4358 vcpu_load(vcpu); 4359 4360 /* CHECK_STOP and LOAD are not supported yet */ 4361 ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED : 4362 KVM_MP_STATE_OPERATING; 4363 4364 vcpu_put(vcpu); 4365 return ret; 4366} 4367 4368int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 4369 struct kvm_mp_state *mp_state) 4370{ 4371 int rc = 0; 4372 4373 vcpu_load(vcpu); 4374 4375 /* user space knows about this interface - let it control the state */ 4376 kvm_s390_set_user_cpu_state_ctrl(vcpu->kvm); 4377 4378 switch (mp_state->mp_state) { 4379 case KVM_MP_STATE_STOPPED: 4380 rc = kvm_s390_vcpu_stop(vcpu); 4381 break; 4382 case KVM_MP_STATE_OPERATING: 4383 rc = kvm_s390_vcpu_start(vcpu); 4384 break; 4385 case KVM_MP_STATE_LOAD: 4386 if (!kvm_s390_pv_cpu_is_protected(vcpu)) { 4387 rc = -ENXIO; 4388 break; 4389 } 4390 rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD); 4391 break; 4392 case KVM_MP_STATE_CHECK_STOP: 4393 fallthrough; /* CHECK_STOP and LOAD are not supported yet */ 4394 default: 4395 rc = -ENXIO; 4396 } 4397 4398 vcpu_put(vcpu); 4399 return rc; 4400} 4401 4402static bool ibs_enabled(struct kvm_vcpu *vcpu) 4403{ 4404 return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS); 4405} 4406 4407static int __kvm_s390_fixup_fault_sync(struct gmap *gmap, gpa_t gaddr, unsigned int flags) 4408{ 4409 struct kvm *kvm = gmap->private; 4410 gfn_t gfn = gpa_to_gfn(gaddr); 4411 bool unlocked; 4412 hva_t vmaddr; 4413 gpa_t tmp; 4414 int rc; 4415 4416 if (kvm_is_ucontrol(kvm)) { 4417 tmp = __gmap_translate(gmap, gaddr); 4418 gfn = gpa_to_gfn(tmp); 4419 } 4420 4421 vmaddr = gfn_to_hva(kvm, gfn); 4422 rc = fixup_user_fault(gmap->mm, vmaddr, FAULT_FLAG_WRITE, &unlocked); 4423 if (!rc) 4424 rc = __gmap_link(gmap, gaddr, vmaddr); 4425 return rc; 4426} 4427 4428/** 4429 * __kvm_s390_mprotect_many() - Apply specified protection to guest pages 4430 * @gmap: the gmap of the guest 4431 * @gpa: the starting guest address 4432 * @npages: how many pages to protect 4433 * @prot: indicates access rights: PROT_NONE, PROT_READ or PROT_WRITE 4434 * @bits: pgste notification bits to set 4435 * 4436 * Returns: 0 in case of success, < 0 in case of error - see gmap_protect_one() 4437 * 4438 * Context: kvm->srcu and gmap->mm need to be held in read mode 4439 */ 4440int __kvm_s390_mprotect_many(struct gmap *gmap, gpa_t gpa, u8 npages, unsigned int prot, 4441 unsigned long bits) 4442{ 4443 unsigned int fault_flag = (prot & PROT_WRITE) ? FAULT_FLAG_WRITE : 0; 4444 gpa_t end = gpa + npages * PAGE_SIZE; 4445 int rc; 4446 4447 for (; gpa < end; gpa = ALIGN(gpa + 1, rc)) { 4448 rc = gmap_protect_one(gmap, gpa, prot, bits); 4449 if (rc == -EAGAIN) { 4450 __kvm_s390_fixup_fault_sync(gmap, gpa, fault_flag); 4451 rc = gmap_protect_one(gmap, gpa, prot, bits); 4452 } 4453 if (rc < 0) 4454 return rc; 4455 } 4456 4457 return 0; 4458} 4459 4460static int kvm_s390_mprotect_notify_prefix(struct kvm_vcpu *vcpu) 4461{ 4462 gpa_t gaddr = kvm_s390_get_prefix(vcpu); 4463 int idx, rc; 4464 4465 idx = srcu_read_lock(&vcpu->kvm->srcu); 4466 mmap_read_lock(vcpu->arch.gmap->mm); 4467 4468 rc = __kvm_s390_mprotect_many(vcpu->arch.gmap, gaddr, 2, PROT_WRITE, GMAP_NOTIFY_MPROT); 4469 4470 mmap_read_unlock(vcpu->arch.gmap->mm); 4471 srcu_read_unlock(&vcpu->kvm->srcu, idx); 4472 4473 return rc; 4474} 4475 4476static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) 4477{ 4478retry: 4479 kvm_s390_vcpu_request_handled(vcpu); 4480 if (!kvm_request_pending(vcpu)) 4481 return 0; 4482 /* 4483 * If the guest prefix changed, re-arm the ipte notifier for the 4484 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock. 4485 * This ensures that the ipte instruction for this request has 4486 * already finished. We might race against a second unmapper that 4487 * wants to set the blocking bit. Lets just retry the request loop. 4488 */ 4489 if (kvm_check_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu)) { 4490 int rc; 4491 4492 rc = kvm_s390_mprotect_notify_prefix(vcpu); 4493 if (rc) { 4494 kvm_make_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu); 4495 return rc; 4496 } 4497 goto retry; 4498 } 4499 4500 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) { 4501 vcpu->arch.sie_block->ihcpu = 0xffff; 4502 goto retry; 4503 } 4504 4505 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { 4506 if (!ibs_enabled(vcpu)) { 4507 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); 4508 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS); 4509 } 4510 goto retry; 4511 } 4512 4513 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { 4514 if (ibs_enabled(vcpu)) { 4515 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); 4516 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS); 4517 } 4518 goto retry; 4519 } 4520 4521 if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) { 4522 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC; 4523 goto retry; 4524 } 4525 4526 if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) { 4527 /* 4528 * Disable CMM virtualization; we will emulate the ESSA 4529 * instruction manually, in order to provide additional 4530 * functionalities needed for live migration. 4531 */ 4532 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA; 4533 goto retry; 4534 } 4535 4536 if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) { 4537 /* 4538 * Re-enable CMM virtualization if CMMA is available and 4539 * CMM has been used. 4540 */ 4541 if ((vcpu->kvm->arch.use_cmma) && 4542 (vcpu->kvm->mm->context.uses_cmm)) 4543 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; 4544 goto retry; 4545 } 4546 4547 /* we left the vsie handler, nothing to do, just clear the request */ 4548 kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu); 4549 4550 return 0; 4551} 4552 4553static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) 4554{ 4555 struct kvm_vcpu *vcpu; 4556 union tod_clock clk; 4557 unsigned long i; 4558 4559 preempt_disable(); 4560 4561 store_tod_clock_ext(&clk); 4562 4563 kvm->arch.epoch = gtod->tod - clk.tod; 4564 kvm->arch.epdx = 0; 4565 if (test_kvm_facility(kvm, 139)) { 4566 kvm->arch.epdx = gtod->epoch_idx - clk.ei; 4567 if (kvm->arch.epoch > gtod->tod) 4568 kvm->arch.epdx -= 1; 4569 } 4570 4571 kvm_s390_vcpu_block_all(kvm); 4572 kvm_for_each_vcpu(i, vcpu, kvm) { 4573 vcpu->arch.sie_block->epoch = kvm->arch.epoch; 4574 vcpu->arch.sie_block->epdx = kvm->arch.epdx; 4575 } 4576 4577 kvm_s390_vcpu_unblock_all(kvm); 4578 preempt_enable(); 4579} 4580 4581int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod) 4582{ 4583 if (!mutex_trylock(&kvm->lock)) 4584 return 0; 4585 __kvm_s390_set_tod_clock(kvm, gtod); 4586 mutex_unlock(&kvm->lock); 4587 return 1; 4588} 4589 4590static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, 4591 unsigned long token) 4592{ 4593 struct kvm_s390_interrupt inti; 4594 struct kvm_s390_irq irq; 4595 4596 if (start_token) { 4597 irq.u.ext.ext_params2 = token; 4598 irq.type = KVM_S390_INT_PFAULT_INIT; 4599 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq)); 4600 } else { 4601 inti.type = KVM_S390_INT_PFAULT_DONE; 4602 inti.parm64 = token; 4603 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti)); 4604 } 4605} 4606 4607bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, 4608 struct kvm_async_pf *work) 4609{ 4610 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); 4611 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); 4612 4613 return true; 4614} 4615 4616void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, 4617 struct kvm_async_pf *work) 4618{ 4619 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); 4620 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); 4621} 4622 4623void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, 4624 struct kvm_async_pf *work) 4625{ 4626 /* s390 will always inject the page directly */ 4627} 4628 4629bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu) 4630{ 4631 /* 4632 * s390 will always inject the page directly, 4633 * but we still want check_async_completion to cleanup 4634 */ 4635 return true; 4636} 4637 4638static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) 4639{ 4640 hva_t hva; 4641 struct kvm_arch_async_pf arch; 4642 4643 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 4644 return false; 4645 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != 4646 vcpu->arch.pfault_compare) 4647 return false; 4648 if (psw_extint_disabled(vcpu)) 4649 return false; 4650 if (kvm_s390_vcpu_has_irq(vcpu, 0)) 4651 return false; 4652 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) 4653 return false; 4654 if (!vcpu->arch.gmap->pfault_enabled) 4655 return false; 4656 4657 hva = gfn_to_hva(vcpu->kvm, current->thread.gmap_teid.addr); 4658 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) 4659 return false; 4660 4661 return kvm_setup_async_pf(vcpu, current->thread.gmap_teid.addr * PAGE_SIZE, hva, &arch); 4662} 4663 4664static int vcpu_pre_run(struct kvm_vcpu *vcpu) 4665{ 4666 int rc, cpuflags; 4667 4668 /* 4669 * On s390 notifications for arriving pages will be delivered directly 4670 * to the guest but the house keeping for completed pfaults is 4671 * handled outside the worker. 4672 */ 4673 kvm_check_async_pf_completion(vcpu); 4674 4675 vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14]; 4676 vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15]; 4677 4678 if (!kvm_is_ucontrol(vcpu->kvm)) { 4679 rc = kvm_s390_deliver_pending_interrupts(vcpu); 4680 if (rc || guestdbg_exit_pending(vcpu)) 4681 return rc; 4682 } 4683 4684 rc = kvm_s390_handle_requests(vcpu); 4685 if (rc) 4686 return rc; 4687 4688 if (guestdbg_enabled(vcpu)) { 4689 kvm_s390_backup_guest_per_regs(vcpu); 4690 kvm_s390_patch_guest_per_regs(vcpu); 4691 } 4692 4693 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask); 4694 4695 vcpu->arch.sie_block->icptcode = 0; 4696 current->thread.gmap_int_code = 0; 4697 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); 4698 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); 4699 trace_kvm_s390_sie_enter(vcpu, cpuflags); 4700 4701 return 0; 4702} 4703 4704static int vcpu_post_run_addressing_exception(struct kvm_vcpu *vcpu) 4705{ 4706 struct kvm_s390_pgm_info pgm_info = { 4707 .code = PGM_ADDRESSING, 4708 }; 4709 u8 opcode, ilen; 4710 int rc; 4711 4712 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); 4713 trace_kvm_s390_sie_fault(vcpu); 4714 4715 /* 4716 * We want to inject an addressing exception, which is defined as a 4717 * suppressing or terminating exception. However, since we came here 4718 * by a DAT access exception, the PSW still points to the faulting 4719 * instruction since DAT exceptions are nullifying. So we've got 4720 * to look up the current opcode to get the length of the instruction 4721 * to be able to forward the PSW. 4722 */ 4723 rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1); 4724 ilen = insn_length(opcode); 4725 if (rc < 0) { 4726 return rc; 4727 } else if (rc) { 4728 /* Instruction-Fetching Exceptions - we can't detect the ilen. 4729 * Forward by arbitrary ilc, injection will take care of 4730 * nullification if necessary. 4731 */ 4732 pgm_info = vcpu->arch.pgm; 4733 ilen = 4; 4734 } 4735 pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID; 4736 kvm_s390_forward_psw(vcpu, ilen); 4737 return kvm_s390_inject_prog_irq(vcpu, &pgm_info); 4738} 4739 4740static void kvm_s390_assert_primary_as(struct kvm_vcpu *vcpu) 4741{ 4742 KVM_BUG(current->thread.gmap_teid.as != PSW_BITS_AS_PRIMARY, vcpu->kvm, 4743 "Unexpected program interrupt 0x%x, TEID 0x%016lx", 4744 current->thread.gmap_int_code, current->thread.gmap_teid.val); 4745} 4746 4747/* 4748 * __kvm_s390_handle_dat_fault() - handle a dat fault for the gmap of a vcpu 4749 * @vcpu: the vCPU whose gmap is to be fixed up 4750 * @gfn: the guest frame number used for memslots (including fake memslots) 4751 * @gaddr: the gmap address, does not have to match @gfn for ucontrol gmaps 4752 * @foll: FOLL_* flags 4753 * 4754 * Return: 0 on success, < 0 in case of error. 4755 * Context: The mm lock must not be held before calling. May sleep. 4756 */ 4757int __kvm_s390_handle_dat_fault(struct kvm_vcpu *vcpu, gfn_t gfn, gpa_t gaddr, unsigned int foll) 4758{ 4759 struct kvm_memory_slot *slot; 4760 unsigned int fault_flags; 4761 bool writable, unlocked; 4762 unsigned long vmaddr; 4763 struct page *page; 4764 kvm_pfn_t pfn; 4765 int rc; 4766 4767 slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); 4768 if (!slot || slot->flags & KVM_MEMSLOT_INVALID) 4769 return vcpu_post_run_addressing_exception(vcpu); 4770 4771 fault_flags = foll & FOLL_WRITE ? FAULT_FLAG_WRITE : 0; 4772 if (vcpu->arch.gmap->pfault_enabled) 4773 foll |= FOLL_NOWAIT; 4774 vmaddr = __gfn_to_hva_memslot(slot, gfn); 4775 4776try_again: 4777 pfn = __kvm_faultin_pfn(slot, gfn, foll, &writable, &page); 4778 4779 /* Access outside memory, inject addressing exception */ 4780 if (is_noslot_pfn(pfn)) 4781 return vcpu_post_run_addressing_exception(vcpu); 4782 /* Signal pending: try again */ 4783 if (pfn == KVM_PFN_ERR_SIGPENDING) 4784 return -EAGAIN; 4785 4786 /* Needs I/O, try to setup async pfault (only possible with FOLL_NOWAIT) */ 4787 if (pfn == KVM_PFN_ERR_NEEDS_IO) { 4788 trace_kvm_s390_major_guest_pfault(vcpu); 4789 if (kvm_arch_setup_async_pf(vcpu)) 4790 return 0; 4791 vcpu->stat.pfault_sync++; 4792 /* Could not setup async pfault, try again synchronously */ 4793 foll &= ~FOLL_NOWAIT; 4794 goto try_again; 4795 } 4796 /* Any other error */ 4797 if (is_error_pfn(pfn)) 4798 return -EFAULT; 4799 4800 /* Success */ 4801 mmap_read_lock(vcpu->arch.gmap->mm); 4802 /* Mark the userspace PTEs as young and/or dirty, to avoid page fault loops */ 4803 rc = fixup_user_fault(vcpu->arch.gmap->mm, vmaddr, fault_flags, &unlocked); 4804 if (!rc) 4805 rc = __gmap_link(vcpu->arch.gmap, gaddr, vmaddr); 4806 scoped_guard(spinlock, &vcpu->kvm->mmu_lock) { 4807 kvm_release_faultin_page(vcpu->kvm, page, false, writable); 4808 } 4809 mmap_read_unlock(vcpu->arch.gmap->mm); 4810 return rc; 4811} 4812 4813static int vcpu_dat_fault_handler(struct kvm_vcpu *vcpu, unsigned long gaddr, unsigned int foll) 4814{ 4815 unsigned long gaddr_tmp; 4816 gfn_t gfn; 4817 4818 gfn = gpa_to_gfn(gaddr); 4819 if (kvm_is_ucontrol(vcpu->kvm)) { 4820 /* 4821 * This translates the per-vCPU guest address into a 4822 * fake guest address, which can then be used with the 4823 * fake memslots that are identity mapping userspace. 4824 * This allows ucontrol VMs to use the normal fault 4825 * resolution path, like normal VMs. 4826 */ 4827 mmap_read_lock(vcpu->arch.gmap->mm); 4828 gaddr_tmp = __gmap_translate(vcpu->arch.gmap, gaddr); 4829 mmap_read_unlock(vcpu->arch.gmap->mm); 4830 if (gaddr_tmp == -EFAULT) { 4831 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; 4832 vcpu->run->s390_ucontrol.trans_exc_code = gaddr; 4833 vcpu->run->s390_ucontrol.pgm_code = PGM_SEGMENT_TRANSLATION; 4834 return -EREMOTE; 4835 } 4836 gfn = gpa_to_gfn(gaddr_tmp); 4837 } 4838 return __kvm_s390_handle_dat_fault(vcpu, gfn, gaddr, foll); 4839} 4840 4841static int vcpu_post_run_handle_fault(struct kvm_vcpu *vcpu) 4842{ 4843 unsigned int foll = 0; 4844 unsigned long gaddr; 4845 int rc; 4846 4847 gaddr = current->thread.gmap_teid.addr * PAGE_SIZE; 4848 if (kvm_s390_cur_gmap_fault_is_write()) 4849 foll = FOLL_WRITE; 4850 4851 switch (current->thread.gmap_int_code & PGM_INT_CODE_MASK) { 4852 case 0: 4853 vcpu->stat.exit_null++; 4854 break; 4855 case PGM_SECURE_STORAGE_ACCESS: 4856 case PGM_SECURE_STORAGE_VIOLATION: 4857 kvm_s390_assert_primary_as(vcpu); 4858 /* 4859 * This can happen after a reboot with asynchronous teardown; 4860 * the new guest (normal or protected) will run on top of the 4861 * previous protected guest. The old pages need to be destroyed 4862 * so the new guest can use them. 4863 */ 4864 if (kvm_s390_pv_destroy_page(vcpu->kvm, gaddr)) { 4865 /* 4866 * Either KVM messed up the secure guest mapping or the 4867 * same page is mapped into multiple secure guests. 4868 * 4869 * This exception is only triggered when a guest 2 is 4870 * running and can therefore never occur in kernel 4871 * context. 4872 */ 4873 pr_warn_ratelimited("Secure storage violation (%x) in task: %s, pid %d\n", 4874 current->thread.gmap_int_code, current->comm, 4875 current->pid); 4876 send_sig(SIGSEGV, current, 0); 4877 } 4878 break; 4879 case PGM_NON_SECURE_STORAGE_ACCESS: 4880 kvm_s390_assert_primary_as(vcpu); 4881 /* 4882 * This is normal operation; a page belonging to a protected 4883 * guest has not been imported yet. Try to import the page into 4884 * the protected guest. 4885 */ 4886 rc = kvm_s390_pv_convert_to_secure(vcpu->kvm, gaddr); 4887 if (rc == -EINVAL) 4888 send_sig(SIGSEGV, current, 0); 4889 if (rc != -ENXIO) 4890 break; 4891 foll = FOLL_WRITE; 4892 fallthrough; 4893 case PGM_PROTECTION: 4894 case PGM_SEGMENT_TRANSLATION: 4895 case PGM_PAGE_TRANSLATION: 4896 case PGM_ASCE_TYPE: 4897 case PGM_REGION_FIRST_TRANS: 4898 case PGM_REGION_SECOND_TRANS: 4899 case PGM_REGION_THIRD_TRANS: 4900 kvm_s390_assert_primary_as(vcpu); 4901 return vcpu_dat_fault_handler(vcpu, gaddr, foll); 4902 default: 4903 KVM_BUG(1, vcpu->kvm, "Unexpected program interrupt 0x%x, TEID 0x%016lx", 4904 current->thread.gmap_int_code, current->thread.gmap_teid.val); 4905 send_sig(SIGSEGV, current, 0); 4906 break; 4907 } 4908 return 0; 4909} 4910 4911static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) 4912{ 4913 struct mcck_volatile_info *mcck_info; 4914 struct sie_page *sie_page; 4915 int rc; 4916 4917 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", 4918 vcpu->arch.sie_block->icptcode); 4919 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); 4920 4921 if (guestdbg_enabled(vcpu)) 4922 kvm_s390_restore_guest_per_regs(vcpu); 4923 4924 vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14; 4925 vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15; 4926 4927 if (exit_reason == -EINTR) { 4928 VCPU_EVENT(vcpu, 3, "%s", "machine check"); 4929 sie_page = container_of(vcpu->arch.sie_block, 4930 struct sie_page, sie_block); 4931 mcck_info = &sie_page->mcck_info; 4932 kvm_s390_reinject_machine_check(vcpu, mcck_info); 4933 return 0; 4934 } 4935 4936 if (vcpu->arch.sie_block->icptcode > 0) { 4937 rc = kvm_handle_sie_intercept(vcpu); 4938 4939 if (rc != -EOPNOTSUPP) 4940 return rc; 4941 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC; 4942 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; 4943 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; 4944 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; 4945 return -EREMOTE; 4946 } 4947 4948 return vcpu_post_run_handle_fault(vcpu); 4949} 4950 4951int noinstr kvm_s390_enter_exit_sie(struct kvm_s390_sie_block *scb, 4952 u64 *gprs, unsigned long gasce) 4953{ 4954 int ret; 4955 4956 guest_state_enter_irqoff(); 4957 4958 /* 4959 * The guest_state_{enter,exit}_irqoff() functions inform lockdep and 4960 * tracing that entry to the guest will enable host IRQs, and exit from 4961 * the guest will disable host IRQs. 4962 */ 4963 ret = sie64a(scb, gprs, gasce); 4964 4965 guest_state_exit_irqoff(); 4966 4967 return ret; 4968} 4969 4970#define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK) 4971static int __vcpu_run(struct kvm_vcpu *vcpu) 4972{ 4973 int rc, exit_reason; 4974 struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block; 4975 4976 /* 4977 * We try to hold kvm->srcu during most of vcpu_run (except when run- 4978 * ning the guest), so that memslots (and other stuff) are protected 4979 */ 4980 kvm_vcpu_srcu_read_lock(vcpu); 4981 4982 while (true) { 4983 rc = vcpu_pre_run(vcpu); 4984 kvm_vcpu_srcu_read_unlock(vcpu); 4985 if (rc || guestdbg_exit_pending(vcpu)) 4986 break; 4987 4988 /* 4989 * As PF_VCPU will be used in fault handler, between 4990 * guest_timing_enter_irqoff and guest_timing_exit_irqoff 4991 * should be no uaccess. 4992 */ 4993 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 4994 memcpy(sie_page->pv_grregs, 4995 vcpu->run->s.regs.gprs, 4996 sizeof(sie_page->pv_grregs)); 4997 } 4998 4999xfer_to_guest_mode_check: 5000 local_irq_disable(); 5001 xfer_to_guest_mode_prepare(); 5002 if (xfer_to_guest_mode_work_pending()) { 5003 local_irq_enable(); 5004 rc = kvm_xfer_to_guest_mode_handle_work(vcpu); 5005 if (rc) 5006 break; 5007 goto xfer_to_guest_mode_check; 5008 } 5009 5010 guest_timing_enter_irqoff(); 5011 __disable_cpu_timer_accounting(vcpu); 5012 5013 exit_reason = kvm_s390_enter_exit_sie(vcpu->arch.sie_block, 5014 vcpu->run->s.regs.gprs, 5015 vcpu->arch.gmap->asce); 5016 5017 __enable_cpu_timer_accounting(vcpu); 5018 guest_timing_exit_irqoff(); 5019 local_irq_enable(); 5020 5021 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5022 memcpy(vcpu->run->s.regs.gprs, 5023 sie_page->pv_grregs, 5024 sizeof(sie_page->pv_grregs)); 5025 /* 5026 * We're not allowed to inject interrupts on intercepts 5027 * that leave the guest state in an "in-between" state 5028 * where the next SIE entry will do a continuation. 5029 * Fence interrupts in our "internal" PSW. 5030 */ 5031 if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR || 5032 vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) { 5033 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; 5034 } 5035 } 5036 kvm_vcpu_srcu_read_lock(vcpu); 5037 5038 rc = vcpu_post_run(vcpu, exit_reason); 5039 if (rc || guestdbg_exit_pending(vcpu)) { 5040 kvm_vcpu_srcu_read_unlock(vcpu); 5041 break; 5042 } 5043 } 5044 5045 return rc; 5046} 5047 5048static void sync_regs_fmt2(struct kvm_vcpu *vcpu) 5049{ 5050 struct kvm_run *kvm_run = vcpu->run; 5051 struct runtime_instr_cb *riccb; 5052 struct gs_cb *gscb; 5053 5054 riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb; 5055 gscb = (struct gs_cb *) &kvm_run->s.regs.gscb; 5056 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; 5057 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; 5058 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 5059 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr; 5060 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp; 5061 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea; 5062 } 5063 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) { 5064 vcpu->arch.pfault_token = kvm_run->s.regs.pft; 5065 vcpu->arch.pfault_select = kvm_run->s.regs.pfs; 5066 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc; 5067 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) 5068 kvm_clear_async_pf_completion_queue(vcpu); 5069 } 5070 if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) { 5071 vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318; 5072 vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc; 5073 VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc); 5074 } 5075 /* 5076 * If userspace sets the riccb (e.g. after migration) to a valid state, 5077 * we should enable RI here instead of doing the lazy enablement. 5078 */ 5079 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) && 5080 test_kvm_facility(vcpu->kvm, 64) && 5081 riccb->v && 5082 !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) { 5083 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)"); 5084 vcpu->arch.sie_block->ecb3 |= ECB3_RI; 5085 } 5086 /* 5087 * If userspace sets the gscb (e.g. after migration) to non-zero, 5088 * we should enable GS here instead of doing the lazy enablement. 5089 */ 5090 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) && 5091 test_kvm_facility(vcpu->kvm, 133) && 5092 gscb->gssm && 5093 !vcpu->arch.gs_enabled) { 5094 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)"); 5095 vcpu->arch.sie_block->ecb |= ECB_GS; 5096 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT; 5097 vcpu->arch.gs_enabled = 1; 5098 } 5099 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) && 5100 test_kvm_facility(vcpu->kvm, 82)) { 5101 vcpu->arch.sie_block->fpf &= ~FPF_BPBC; 5102 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0; 5103 } 5104 if (cpu_has_gs()) { 5105 preempt_disable(); 5106 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT); 5107 if (current->thread.gs_cb) { 5108 vcpu->arch.host_gscb = current->thread.gs_cb; 5109 save_gs_cb(vcpu->arch.host_gscb); 5110 } 5111 if (vcpu->arch.gs_enabled) { 5112 current->thread.gs_cb = (struct gs_cb *) 5113 &vcpu->run->s.regs.gscb; 5114 restore_gs_cb(current->thread.gs_cb); 5115 } 5116 preempt_enable(); 5117 } 5118 /* SIE will load etoken directly from SDNX and therefore kvm_run */ 5119} 5120 5121static void sync_regs(struct kvm_vcpu *vcpu) 5122{ 5123 struct kvm_run *kvm_run = vcpu->run; 5124 5125 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) 5126 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); 5127 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { 5128 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); 5129 /* some control register changes require a tlb flush */ 5130 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 5131 } 5132 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) { 5133 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm); 5134 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc; 5135 } 5136 save_access_regs(vcpu->arch.host_acrs); 5137 restore_access_regs(vcpu->run->s.regs.acrs); 5138 vcpu->arch.acrs_loaded = true; 5139 kvm_s390_fpu_load(vcpu->run); 5140 /* Sync fmt2 only data */ 5141 if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) { 5142 sync_regs_fmt2(vcpu); 5143 } else { 5144 /* 5145 * In several places we have to modify our internal view to 5146 * not do things that are disallowed by the ultravisor. For 5147 * example we must not inject interrupts after specific exits 5148 * (e.g. 112 prefix page not secure). We do this by turning 5149 * off the machine check, external and I/O interrupt bits 5150 * of our PSW copy. To avoid getting validity intercepts, we 5151 * do only accept the condition code from userspace. 5152 */ 5153 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC; 5154 vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask & 5155 PSW_MASK_CC; 5156 } 5157 5158 kvm_run->kvm_dirty_regs = 0; 5159} 5160 5161static void store_regs_fmt2(struct kvm_vcpu *vcpu) 5162{ 5163 struct kvm_run *kvm_run = vcpu->run; 5164 5165 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr; 5166 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp; 5167 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea; 5168 kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC; 5169 kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val; 5170 if (cpu_has_gs()) { 5171 preempt_disable(); 5172 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT); 5173 if (vcpu->arch.gs_enabled) 5174 save_gs_cb(current->thread.gs_cb); 5175 current->thread.gs_cb = vcpu->arch.host_gscb; 5176 restore_gs_cb(vcpu->arch.host_gscb); 5177 if (!vcpu->arch.host_gscb) 5178 local_ctl_clear_bit(2, CR2_GUARDED_STORAGE_BIT); 5179 vcpu->arch.host_gscb = NULL; 5180 preempt_enable(); 5181 } 5182 /* SIE will save etoken directly into SDNX and therefore kvm_run */ 5183} 5184 5185static void store_regs(struct kvm_vcpu *vcpu) 5186{ 5187 struct kvm_run *kvm_run = vcpu->run; 5188 5189 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; 5190 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; 5191 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu); 5192 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); 5193 kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu); 5194 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc; 5195 kvm_run->s.regs.pft = vcpu->arch.pfault_token; 5196 kvm_run->s.regs.pfs = vcpu->arch.pfault_select; 5197 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare; 5198 save_access_regs(vcpu->run->s.regs.acrs); 5199 restore_access_regs(vcpu->arch.host_acrs); 5200 vcpu->arch.acrs_loaded = false; 5201 kvm_s390_fpu_store(vcpu->run); 5202 if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) 5203 store_regs_fmt2(vcpu); 5204} 5205 5206int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) 5207{ 5208 struct kvm_run *kvm_run = vcpu->run; 5209 DECLARE_KERNEL_FPU_ONSTACK32(fpu); 5210 int rc; 5211 5212 /* 5213 * Running a VM while dumping always has the potential to 5214 * produce inconsistent dump data. But for PV vcpus a SIE 5215 * entry while dumping could also lead to a fatal validity 5216 * intercept which we absolutely want to avoid. 5217 */ 5218 if (vcpu->kvm->arch.pv.dumping) 5219 return -EINVAL; 5220 5221 if (!vcpu->wants_to_run) 5222 return -EINTR; 5223 5224 if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS || 5225 kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS) 5226 return -EINVAL; 5227 5228 vcpu_load(vcpu); 5229 5230 if (guestdbg_exit_pending(vcpu)) { 5231 kvm_s390_prepare_debug_exit(vcpu); 5232 rc = 0; 5233 goto out; 5234 } 5235 5236 kvm_sigset_activate(vcpu); 5237 5238 /* 5239 * no need to check the return value of vcpu_start as it can only have 5240 * an error for protvirt, but protvirt means user cpu state 5241 */ 5242 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) { 5243 kvm_s390_vcpu_start(vcpu); 5244 } else if (is_vcpu_stopped(vcpu)) { 5245 pr_err_ratelimited("can't run stopped vcpu %d\n", 5246 vcpu->vcpu_id); 5247 rc = -EINVAL; 5248 goto out; 5249 } 5250 5251 kernel_fpu_begin(&fpu, KERNEL_FPC | KERNEL_VXR); 5252 sync_regs(vcpu); 5253 enable_cpu_timer_accounting(vcpu); 5254 5255 might_fault(); 5256 rc = __vcpu_run(vcpu); 5257 5258 if (signal_pending(current) && !rc) { 5259 kvm_run->exit_reason = KVM_EXIT_INTR; 5260 vcpu->stat.signal_exits++; 5261 rc = -EINTR; 5262 } 5263 5264 if (guestdbg_exit_pending(vcpu) && !rc) { 5265 kvm_s390_prepare_debug_exit(vcpu); 5266 rc = 0; 5267 } 5268 5269 if (rc == -EREMOTE) { 5270 /* userspace support is needed, kvm_run has been prepared */ 5271 rc = 0; 5272 } 5273 5274 disable_cpu_timer_accounting(vcpu); 5275 store_regs(vcpu); 5276 kernel_fpu_end(&fpu, KERNEL_FPC | KERNEL_VXR); 5277 5278 kvm_sigset_deactivate(vcpu); 5279 5280 vcpu->stat.exit_userspace++; 5281out: 5282 vcpu_put(vcpu); 5283 return rc; 5284} 5285 5286/* 5287 * store status at address 5288 * we use have two special cases: 5289 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit 5290 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix 5291 */ 5292int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) 5293{ 5294 unsigned char archmode = 1; 5295 freg_t fprs[NUM_FPRS]; 5296 unsigned int px; 5297 u64 clkcomp, cputm; 5298 int rc; 5299 5300 px = kvm_s390_get_prefix(vcpu); 5301 if (gpa == KVM_S390_STORE_STATUS_NOADDR) { 5302 if (write_guest_abs(vcpu, 163, &archmode, 1)) 5303 return -EFAULT; 5304 gpa = 0; 5305 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { 5306 if (write_guest_real(vcpu, 163, &archmode, 1)) 5307 return -EFAULT; 5308 gpa = px; 5309 } else 5310 gpa -= __LC_FPREGS_SAVE_AREA; 5311 5312 /* manually convert vector registers if necessary */ 5313 if (cpu_has_vx()) { 5314 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs); 5315 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 5316 fprs, 128); 5317 } else { 5318 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA, 5319 vcpu->run->s.regs.fprs, 128); 5320 } 5321 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA, 5322 vcpu->run->s.regs.gprs, 128); 5323 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA, 5324 &vcpu->arch.sie_block->gpsw, 16); 5325 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA, 5326 &px, 4); 5327 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA, 5328 &vcpu->run->s.regs.fpc, 4); 5329 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA, 5330 &vcpu->arch.sie_block->todpr, 4); 5331 cputm = kvm_s390_get_cpu_timer(vcpu); 5332 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA, 5333 &cputm, 8); 5334 clkcomp = vcpu->arch.sie_block->ckc >> 8; 5335 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA, 5336 &clkcomp, 8); 5337 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA, 5338 &vcpu->run->s.regs.acrs, 64); 5339 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA, 5340 &vcpu->arch.sie_block->gcr, 128); 5341 return rc ? -EFAULT : 0; 5342} 5343 5344int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) 5345{ 5346 /* 5347 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy 5348 * switch in the run ioctl. Let's update our copies before we save 5349 * it into the save area 5350 */ 5351 kvm_s390_fpu_store(vcpu->run); 5352 save_access_regs(vcpu->run->s.regs.acrs); 5353 5354 return kvm_s390_store_status_unloaded(vcpu, addr); 5355} 5356 5357static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 5358{ 5359 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); 5360 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu); 5361} 5362 5363static void __disable_ibs_on_all_vcpus(struct kvm *kvm) 5364{ 5365 unsigned long i; 5366 struct kvm_vcpu *vcpu; 5367 5368 kvm_for_each_vcpu(i, vcpu, kvm) { 5369 __disable_ibs_on_vcpu(vcpu); 5370 } 5371} 5372 5373static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) 5374{ 5375 if (!sclp.has_ibs) 5376 return; 5377 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); 5378 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu); 5379} 5380 5381int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) 5382{ 5383 int i, online_vcpus, r = 0, started_vcpus = 0; 5384 5385 if (!is_vcpu_stopped(vcpu)) 5386 return 0; 5387 5388 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); 5389 /* Only one cpu at a time may enter/leave the STOPPED state. */ 5390 spin_lock(&vcpu->kvm->arch.start_stop_lock); 5391 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 5392 5393 /* Let's tell the UV that we want to change into the operating state */ 5394 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5395 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR); 5396 if (r) { 5397 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5398 return r; 5399 } 5400 } 5401 5402 for (i = 0; i < online_vcpus; i++) { 5403 if (!is_vcpu_stopped(kvm_get_vcpu(vcpu->kvm, i))) 5404 started_vcpus++; 5405 } 5406 5407 if (started_vcpus == 0) { 5408 /* we're the only active VCPU -> speed it up */ 5409 __enable_ibs_on_vcpu(vcpu); 5410 } else if (started_vcpus == 1) { 5411 /* 5412 * As we are starting a second VCPU, we have to disable 5413 * the IBS facility on all VCPUs to remove potentially 5414 * outstanding ENABLE requests. 5415 */ 5416 __disable_ibs_on_all_vcpus(vcpu->kvm); 5417 } 5418 5419 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED); 5420 /* 5421 * The real PSW might have changed due to a RESTART interpreted by the 5422 * ultravisor. We block all interrupts and let the next sie exit 5423 * refresh our view. 5424 */ 5425 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5426 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK; 5427 /* 5428 * Another VCPU might have used IBS while we were offline. 5429 * Let's play safe and flush the VCPU at startup. 5430 */ 5431 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); 5432 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5433 return 0; 5434} 5435 5436int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) 5437{ 5438 int i, online_vcpus, r = 0, started_vcpus = 0; 5439 struct kvm_vcpu *started_vcpu = NULL; 5440 5441 if (is_vcpu_stopped(vcpu)) 5442 return 0; 5443 5444 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); 5445 /* Only one cpu at a time may enter/leave the STOPPED state. */ 5446 spin_lock(&vcpu->kvm->arch.start_stop_lock); 5447 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); 5448 5449 /* Let's tell the UV that we want to change into the stopped state */ 5450 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5451 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP); 5452 if (r) { 5453 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5454 return r; 5455 } 5456 } 5457 5458 /* 5459 * Set the VCPU to STOPPED and THEN clear the interrupt flag, 5460 * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders 5461 * have been fully processed. This will ensure that the VCPU 5462 * is kept BUSY if another VCPU is inquiring with SIGP SENSE. 5463 */ 5464 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED); 5465 kvm_s390_clear_stop_irq(vcpu); 5466 5467 __disable_ibs_on_vcpu(vcpu); 5468 5469 for (i = 0; i < online_vcpus; i++) { 5470 struct kvm_vcpu *tmp = kvm_get_vcpu(vcpu->kvm, i); 5471 5472 if (!is_vcpu_stopped(tmp)) { 5473 started_vcpus++; 5474 started_vcpu = tmp; 5475 } 5476 } 5477 5478 if (started_vcpus == 1) { 5479 /* 5480 * As we only have one VCPU left, we want to enable the 5481 * IBS facility for that VCPU to speed it up. 5482 */ 5483 __enable_ibs_on_vcpu(started_vcpu); 5484 } 5485 5486 spin_unlock(&vcpu->kvm->arch.start_stop_lock); 5487 return 0; 5488} 5489 5490static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, 5491 struct kvm_enable_cap *cap) 5492{ 5493 int r; 5494 5495 if (cap->flags) 5496 return -EINVAL; 5497 5498 switch (cap->cap) { 5499 case KVM_CAP_S390_CSS_SUPPORT: 5500 if (!vcpu->kvm->arch.css_support) { 5501 vcpu->kvm->arch.css_support = 1; 5502 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support"); 5503 trace_kvm_s390_enable_css(vcpu->kvm); 5504 } 5505 r = 0; 5506 break; 5507 default: 5508 r = -EINVAL; 5509 break; 5510 } 5511 return r; 5512} 5513 5514static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu, 5515 struct kvm_s390_mem_op *mop) 5516{ 5517 void __user *uaddr = (void __user *)mop->buf; 5518 void *sida_addr; 5519 int r = 0; 5520 5521 if (mop->flags || !mop->size) 5522 return -EINVAL; 5523 if (mop->size + mop->sida_offset < mop->size) 5524 return -EINVAL; 5525 if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block)) 5526 return -E2BIG; 5527 if (!kvm_s390_pv_cpu_is_protected(vcpu)) 5528 return -EINVAL; 5529 5530 sida_addr = (char *)sida_addr(vcpu->arch.sie_block) + mop->sida_offset; 5531 5532 switch (mop->op) { 5533 case KVM_S390_MEMOP_SIDA_READ: 5534 if (copy_to_user(uaddr, sida_addr, mop->size)) 5535 r = -EFAULT; 5536 5537 break; 5538 case KVM_S390_MEMOP_SIDA_WRITE: 5539 if (copy_from_user(sida_addr, uaddr, mop->size)) 5540 r = -EFAULT; 5541 break; 5542 } 5543 return r; 5544} 5545 5546static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu, 5547 struct kvm_s390_mem_op *mop) 5548{ 5549 void __user *uaddr = (void __user *)mop->buf; 5550 enum gacc_mode acc_mode; 5551 void *tmpbuf = NULL; 5552 int r; 5553 5554 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_INJECT_EXCEPTION | 5555 KVM_S390_MEMOP_F_CHECK_ONLY | 5556 KVM_S390_MEMOP_F_SKEY_PROTECTION); 5557 if (r) 5558 return r; 5559 if (mop->ar >= NUM_ACRS) 5560 return -EINVAL; 5561 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5562 return -EINVAL; 5563 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) { 5564 tmpbuf = vmalloc(mop->size); 5565 if (!tmpbuf) 5566 return -ENOMEM; 5567 } 5568 5569 acc_mode = mop->op == KVM_S390_MEMOP_LOGICAL_READ ? GACC_FETCH : GACC_STORE; 5570 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) { 5571 r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, 5572 acc_mode, mop->key); 5573 goto out_inject; 5574 } 5575 if (acc_mode == GACC_FETCH) { 5576 r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf, 5577 mop->size, mop->key); 5578 if (r) 5579 goto out_inject; 5580 if (copy_to_user(uaddr, tmpbuf, mop->size)) { 5581 r = -EFAULT; 5582 goto out_free; 5583 } 5584 } else { 5585 if (copy_from_user(tmpbuf, uaddr, mop->size)) { 5586 r = -EFAULT; 5587 goto out_free; 5588 } 5589 r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf, 5590 mop->size, mop->key); 5591 } 5592 5593out_inject: 5594 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0) 5595 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm); 5596 5597out_free: 5598 vfree(tmpbuf); 5599 return r; 5600} 5601 5602static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu, 5603 struct kvm_s390_mem_op *mop) 5604{ 5605 int r, srcu_idx; 5606 5607 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); 5608 5609 switch (mop->op) { 5610 case KVM_S390_MEMOP_LOGICAL_READ: 5611 case KVM_S390_MEMOP_LOGICAL_WRITE: 5612 r = kvm_s390_vcpu_mem_op(vcpu, mop); 5613 break; 5614 case KVM_S390_MEMOP_SIDA_READ: 5615 case KVM_S390_MEMOP_SIDA_WRITE: 5616 /* we are locked against sida going away by the vcpu->mutex */ 5617 r = kvm_s390_vcpu_sida_op(vcpu, mop); 5618 break; 5619 default: 5620 r = -EINVAL; 5621 } 5622 5623 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx); 5624 return r; 5625} 5626 5627long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl, 5628 unsigned long arg) 5629{ 5630 struct kvm_vcpu *vcpu = filp->private_data; 5631 void __user *argp = (void __user *)arg; 5632 int rc; 5633 5634 switch (ioctl) { 5635 case KVM_S390_IRQ: { 5636 struct kvm_s390_irq s390irq; 5637 5638 if (copy_from_user(&s390irq, argp, sizeof(s390irq))) 5639 return -EFAULT; 5640 rc = kvm_s390_inject_vcpu(vcpu, &s390irq); 5641 break; 5642 } 5643 case KVM_S390_INTERRUPT: { 5644 struct kvm_s390_interrupt s390int; 5645 struct kvm_s390_irq s390irq = {}; 5646 5647 if (copy_from_user(&s390int, argp, sizeof(s390int))) 5648 return -EFAULT; 5649 if (s390int_to_s390irq(&s390int, &s390irq)) 5650 return -EINVAL; 5651 rc = kvm_s390_inject_vcpu(vcpu, &s390irq); 5652 break; 5653 } 5654 default: 5655 rc = -ENOIOCTLCMD; 5656 break; 5657 } 5658 5659 /* 5660 * To simplify single stepping of userspace-emulated instructions, 5661 * KVM_EXIT_S390_SIEIC exit sets KVM_GUESTDBG_EXIT_PENDING (see 5662 * should_handle_per_ifetch()). However, if userspace emulation injects 5663 * an interrupt, it needs to be cleared, so that KVM_EXIT_DEBUG happens 5664 * after (and not before) the interrupt delivery. 5665 */ 5666 if (!rc) 5667 vcpu->guest_debug &= ~KVM_GUESTDBG_EXIT_PENDING; 5668 5669 return rc; 5670} 5671 5672static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu, 5673 struct kvm_pv_cmd *cmd) 5674{ 5675 struct kvm_s390_pv_dmp dmp; 5676 void *data; 5677 int ret; 5678 5679 /* Dump initialization is a prerequisite */ 5680 if (!vcpu->kvm->arch.pv.dumping) 5681 return -EINVAL; 5682 5683 if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp))) 5684 return -EFAULT; 5685 5686 /* We only handle this subcmd right now */ 5687 if (dmp.subcmd != KVM_PV_DUMP_CPU) 5688 return -EINVAL; 5689 5690 /* CPU dump length is the same as create cpu storage donation. */ 5691 if (dmp.buff_len != uv_info.guest_cpu_stor_len) 5692 return -EINVAL; 5693 5694 data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL); 5695 if (!data) 5696 return -ENOMEM; 5697 5698 ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc); 5699 5700 VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x", 5701 vcpu->vcpu_id, cmd->rc, cmd->rrc); 5702 5703 if (ret) 5704 ret = -EINVAL; 5705 5706 /* On success copy over the dump data */ 5707 if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len)) 5708 ret = -EFAULT; 5709 5710 kvfree(data); 5711 return ret; 5712} 5713 5714long kvm_arch_vcpu_ioctl(struct file *filp, 5715 unsigned int ioctl, unsigned long arg) 5716{ 5717 struct kvm_vcpu *vcpu = filp->private_data; 5718 void __user *argp = (void __user *)arg; 5719 int idx; 5720 long r; 5721 u16 rc, rrc; 5722 5723 vcpu_load(vcpu); 5724 5725 switch (ioctl) { 5726 case KVM_S390_STORE_STATUS: 5727 idx = srcu_read_lock(&vcpu->kvm->srcu); 5728 r = kvm_s390_store_status_unloaded(vcpu, arg); 5729 srcu_read_unlock(&vcpu->kvm->srcu, idx); 5730 break; 5731 case KVM_S390_SET_INITIAL_PSW: { 5732 psw_t psw; 5733 5734 r = -EFAULT; 5735 if (copy_from_user(&psw, argp, sizeof(psw))) 5736 break; 5737 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); 5738 break; 5739 } 5740 case KVM_S390_CLEAR_RESET: 5741 r = 0; 5742 kvm_arch_vcpu_ioctl_clear_reset(vcpu); 5743 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5744 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5745 UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc); 5746 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x", 5747 rc, rrc); 5748 } 5749 break; 5750 case KVM_S390_INITIAL_RESET: 5751 r = 0; 5752 kvm_arch_vcpu_ioctl_initial_reset(vcpu); 5753 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5754 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5755 UVC_CMD_CPU_RESET_INITIAL, 5756 &rc, &rrc); 5757 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x", 5758 rc, rrc); 5759 } 5760 break; 5761 case KVM_S390_NORMAL_RESET: 5762 r = 0; 5763 kvm_arch_vcpu_ioctl_normal_reset(vcpu); 5764 if (kvm_s390_pv_cpu_is_protected(vcpu)) { 5765 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu), 5766 UVC_CMD_CPU_RESET, &rc, &rrc); 5767 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x", 5768 rc, rrc); 5769 } 5770 break; 5771 case KVM_SET_ONE_REG: 5772 case KVM_GET_ONE_REG: { 5773 struct kvm_one_reg reg; 5774 r = -EINVAL; 5775 if (kvm_s390_pv_cpu_is_protected(vcpu)) 5776 break; 5777 r = -EFAULT; 5778 if (copy_from_user(®, argp, sizeof(reg))) 5779 break; 5780 if (ioctl == KVM_SET_ONE_REG) 5781 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); 5782 else 5783 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); 5784 break; 5785 } 5786#ifdef CONFIG_KVM_S390_UCONTROL 5787 case KVM_S390_UCAS_MAP: { 5788 struct kvm_s390_ucas_mapping ucasmap; 5789 5790 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 5791 r = -EFAULT; 5792 break; 5793 } 5794 5795 if (!kvm_is_ucontrol(vcpu->kvm)) { 5796 r = -EINVAL; 5797 break; 5798 } 5799 5800 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr, 5801 ucasmap.vcpu_addr, ucasmap.length); 5802 break; 5803 } 5804 case KVM_S390_UCAS_UNMAP: { 5805 struct kvm_s390_ucas_mapping ucasmap; 5806 5807 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { 5808 r = -EFAULT; 5809 break; 5810 } 5811 5812 if (!kvm_is_ucontrol(vcpu->kvm)) { 5813 r = -EINVAL; 5814 break; 5815 } 5816 5817 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr, 5818 ucasmap.length); 5819 break; 5820 } 5821#endif 5822 case KVM_S390_VCPU_FAULT: { 5823 idx = srcu_read_lock(&vcpu->kvm->srcu); 5824 r = vcpu_dat_fault_handler(vcpu, arg, 0); 5825 srcu_read_unlock(&vcpu->kvm->srcu, idx); 5826 break; 5827 } 5828 case KVM_ENABLE_CAP: 5829 { 5830 struct kvm_enable_cap cap; 5831 r = -EFAULT; 5832 if (copy_from_user(&cap, argp, sizeof(cap))) 5833 break; 5834 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); 5835 break; 5836 } 5837 case KVM_S390_MEM_OP: { 5838 struct kvm_s390_mem_op mem_op; 5839 5840 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0) 5841 r = kvm_s390_vcpu_memsida_op(vcpu, &mem_op); 5842 else 5843 r = -EFAULT; 5844 break; 5845 } 5846 case KVM_S390_SET_IRQ_STATE: { 5847 struct kvm_s390_irq_state irq_state; 5848 5849 r = -EFAULT; 5850 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 5851 break; 5852 if (irq_state.len > VCPU_IRQS_MAX_BUF || 5853 irq_state.len == 0 || 5854 irq_state.len % sizeof(struct kvm_s390_irq) > 0) { 5855 r = -EINVAL; 5856 break; 5857 } 5858 /* do not use irq_state.flags, it will break old QEMUs */ 5859 r = kvm_s390_set_irq_state(vcpu, 5860 (void __user *) irq_state.buf, 5861 irq_state.len); 5862 break; 5863 } 5864 case KVM_S390_GET_IRQ_STATE: { 5865 struct kvm_s390_irq_state irq_state; 5866 5867 r = -EFAULT; 5868 if (copy_from_user(&irq_state, argp, sizeof(irq_state))) 5869 break; 5870 if (irq_state.len == 0) { 5871 r = -EINVAL; 5872 break; 5873 } 5874 /* do not use irq_state.flags, it will break old QEMUs */ 5875 r = kvm_s390_get_irq_state(vcpu, 5876 (__u8 __user *) irq_state.buf, 5877 irq_state.len); 5878 break; 5879 } 5880 case KVM_S390_PV_CPU_COMMAND: { 5881 struct kvm_pv_cmd cmd; 5882 5883 r = -EINVAL; 5884 if (!is_prot_virt_host()) 5885 break; 5886 5887 r = -EFAULT; 5888 if (copy_from_user(&cmd, argp, sizeof(cmd))) 5889 break; 5890 5891 r = -EINVAL; 5892 if (cmd.flags) 5893 break; 5894 5895 /* We only handle this cmd right now */ 5896 if (cmd.cmd != KVM_PV_DUMP) 5897 break; 5898 5899 r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd); 5900 5901 /* Always copy over UV rc / rrc data */ 5902 if (copy_to_user((__u8 __user *)argp, &cmd.rc, 5903 sizeof(cmd.rc) + sizeof(cmd.rrc))) 5904 r = -EFAULT; 5905 break; 5906 } 5907 default: 5908 r = -ENOTTY; 5909 } 5910 5911 vcpu_put(vcpu); 5912 return r; 5913} 5914 5915vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 5916{ 5917#ifdef CONFIG_KVM_S390_UCONTROL 5918 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) 5919 && (kvm_is_ucontrol(vcpu->kvm))) { 5920 vmf->page = virt_to_page(vcpu->arch.sie_block); 5921 get_page(vmf->page); 5922 return 0; 5923 } 5924#endif 5925 return VM_FAULT_SIGBUS; 5926} 5927 5928bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) 5929{ 5930 return true; 5931} 5932 5933/* Section: memory related */ 5934int kvm_arch_prepare_memory_region(struct kvm *kvm, 5935 const struct kvm_memory_slot *old, 5936 struct kvm_memory_slot *new, 5937 enum kvm_mr_change change) 5938{ 5939 gpa_t size; 5940 5941 if (kvm_is_ucontrol(kvm) && new->id < KVM_USER_MEM_SLOTS) 5942 return -EINVAL; 5943 5944 /* When we are protected, we should not change the memory slots */ 5945 if (kvm_s390_pv_get_handle(kvm)) 5946 return -EINVAL; 5947 5948 if (change != KVM_MR_DELETE && change != KVM_MR_FLAGS_ONLY) { 5949 /* 5950 * A few sanity checks. We can have memory slots which have to be 5951 * located/ended at a segment boundary (1MB). The memory in userland is 5952 * ok to be fragmented into various different vmas. It is okay to mmap() 5953 * and munmap() stuff in this slot after doing this call at any time 5954 */ 5955 5956 if (new->userspace_addr & 0xffffful) 5957 return -EINVAL; 5958 5959 size = new->npages * PAGE_SIZE; 5960 if (size & 0xffffful) 5961 return -EINVAL; 5962 5963 if ((new->base_gfn * PAGE_SIZE) + size > kvm->arch.mem_limit) 5964 return -EINVAL; 5965 } 5966 5967 if (!kvm->arch.migration_mode) 5968 return 0; 5969 5970 /* 5971 * Turn off migration mode when: 5972 * - userspace creates a new memslot with dirty logging off, 5973 * - userspace modifies an existing memslot (MOVE or FLAGS_ONLY) and 5974 * dirty logging is turned off. 5975 * Migration mode expects dirty page logging being enabled to store 5976 * its dirty bitmap. 5977 */ 5978 if (change != KVM_MR_DELETE && 5979 !(new->flags & KVM_MEM_LOG_DIRTY_PAGES)) 5980 WARN(kvm_s390_vm_stop_migration(kvm), 5981 "Failed to stop migration mode"); 5982 5983 return 0; 5984} 5985 5986void kvm_arch_commit_memory_region(struct kvm *kvm, 5987 struct kvm_memory_slot *old, 5988 const struct kvm_memory_slot *new, 5989 enum kvm_mr_change change) 5990{ 5991 int rc = 0; 5992 5993 if (kvm_is_ucontrol(kvm)) 5994 return; 5995 5996 switch (change) { 5997 case KVM_MR_DELETE: 5998 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE, 5999 old->npages * PAGE_SIZE); 6000 break; 6001 case KVM_MR_MOVE: 6002 rc = gmap_unmap_segment(kvm->arch.gmap, old->base_gfn * PAGE_SIZE, 6003 old->npages * PAGE_SIZE); 6004 if (rc) 6005 break; 6006 fallthrough; 6007 case KVM_MR_CREATE: 6008 rc = gmap_map_segment(kvm->arch.gmap, new->userspace_addr, 6009 new->base_gfn * PAGE_SIZE, 6010 new->npages * PAGE_SIZE); 6011 break; 6012 case KVM_MR_FLAGS_ONLY: 6013 break; 6014 default: 6015 WARN(1, "Unknown KVM MR CHANGE: %d\n", change); 6016 } 6017 if (rc) 6018 pr_warn("failed to commit memory region\n"); 6019 return; 6020} 6021 6022static inline unsigned long nonhyp_mask(int i) 6023{ 6024 unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30; 6025 6026 return 0x0000ffffffffffffUL >> (nonhyp_fai << 4); 6027} 6028 6029static int __init kvm_s390_init(void) 6030{ 6031 int i, r; 6032 6033 if (!sclp.has_sief2) { 6034 pr_info("SIE is not available\n"); 6035 return -ENODEV; 6036 } 6037 6038 if (nested && hpage) { 6039 pr_info("A KVM host that supports nesting cannot back its KVM guests with huge pages\n"); 6040 return -EINVAL; 6041 } 6042 6043 for (i = 0; i < 16; i++) 6044 kvm_s390_fac_base[i] |= 6045 stfle_fac_list[i] & nonhyp_mask(i); 6046 6047 r = __kvm_s390_init(); 6048 if (r) 6049 return r; 6050 6051 r = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); 6052 if (r) { 6053 __kvm_s390_exit(); 6054 return r; 6055 } 6056 return 0; 6057} 6058 6059static void __exit kvm_s390_exit(void) 6060{ 6061 kvm_exit(); 6062 6063 __kvm_s390_exit(); 6064} 6065 6066module_init(kvm_s390_init); 6067module_exit(kvm_s390_exit); 6068 6069/* 6070 * Enable autoloading of the kvm module. 6071 * Note that we add the module alias here instead of virt/kvm/kvm_main.c 6072 * since x86 takes a different approach. 6073 */ 6074#include <linux/miscdevice.h> 6075MODULE_ALIAS_MISCDEV(KVM_MINOR); 6076MODULE_ALIAS("devname:kvm");
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