kvm_host.h

  1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
  4 *
  5 * Authors:
  6 *     Anup Patel <anup.patel@wdc.com>
  7 */
  8
  9#ifndef __RISCV_KVM_HOST_H__
 10#define __RISCV_KVM_HOST_H__
 11
 12#include <linux/types.h>
 13#include <linux/kvm.h>
 14#include <linux/kvm_types.h>
 15#include <linux/spinlock.h>
 16#include <asm/hwcap.h>
 17#include <asm/kvm_aia.h>
 18#include <asm/ptrace.h>
 19#include <asm/kvm_tlb.h>
 20#include <asm/kvm_vmid.h>
 21#include <asm/kvm_vcpu_fp.h>
 22#include <asm/kvm_vcpu_insn.h>
 23#include <asm/kvm_vcpu_sbi.h>
 24#include <asm/kvm_vcpu_sbi_fwft.h>
 25#include <asm/kvm_vcpu_timer.h>
 26#include <asm/kvm_vcpu_pmu.h>
 27
 28#define KVM_MAX_VCPUS			1024
 29
 30#define KVM_HALT_POLL_NS_DEFAULT	500000
 31
 32#define KVM_VCPU_MAX_FEATURES		0
 33
 34#define KVM_IRQCHIP_NUM_PINS		1024
 35
 36#define KVM_REQ_SLEEP \
 37	KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
 38#define KVM_REQ_VCPU_RESET		KVM_ARCH_REQ(1)
 39#define KVM_REQ_UPDATE_HGATP		KVM_ARCH_REQ(2)
 40#define KVM_REQ_FENCE_I			\
 41	KVM_ARCH_REQ_FLAGS(3, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
 42#define KVM_REQ_HFENCE_VVMA_ALL		\
 43	KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
 44#define KVM_REQ_HFENCE			\
 45	KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
 46#define KVM_REQ_STEAL_UPDATE		KVM_ARCH_REQ(6)
 47
 48#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLBS_RANGE
 49
 50#define KVM_HEDELEG_DEFAULT		(BIT(EXC_INST_MISALIGNED) | \
 51					 BIT(EXC_INST_ILLEGAL)     | \
 52					 BIT(EXC_BREAKPOINT)      | \
 53					 BIT(EXC_SYSCALL)         | \
 54					 BIT(EXC_INST_PAGE_FAULT) | \
 55					 BIT(EXC_LOAD_PAGE_FAULT) | \
 56					 BIT(EXC_STORE_PAGE_FAULT))
 57
 58#define KVM_HIDELEG_DEFAULT		(BIT(IRQ_VS_SOFT)  | \
 59					 BIT(IRQ_VS_TIMER) | \
 60					 BIT(IRQ_VS_EXT))
 61
 62#define KVM_DIRTY_LOG_MANUAL_CAPS	(KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | \
 63					 KVM_DIRTY_LOG_INITIALLY_SET)
 64
 65struct kvm_vm_stat {
 66	struct kvm_vm_stat_generic generic;
 67};
 68
 69struct kvm_vcpu_stat {
 70	struct kvm_vcpu_stat_generic generic;
 71	u64 ecall_exit_stat;
 72	u64 wfi_exit_stat;
 73	u64 wrs_exit_stat;
 74	u64 mmio_exit_user;
 75	u64 mmio_exit_kernel;
 76	u64 csr_exit_user;
 77	u64 csr_exit_kernel;
 78	u64 signal_exits;
 79	u64 exits;
 80	u64 instr_illegal_exits;
 81	u64 load_misaligned_exits;
 82	u64 store_misaligned_exits;
 83	u64 load_access_exits;
 84	u64 store_access_exits;
 85};
 86
 87struct kvm_arch_memory_slot {
 88};
 89
 90struct kvm_arch {
 91	/* G-stage vmid */
 92	struct kvm_vmid vmid;
 93
 94	/* G-stage page table */
 95	pgd_t *pgd;
 96	phys_addr_t pgd_phys;
 97
 98	/* Guest Timer */
 99	struct kvm_guest_timer timer;
100
101	/* AIA Guest/VM context */
102	struct kvm_aia aia;
103
104	/* KVM_CAP_RISCV_MP_STATE_RESET */
105	bool mp_state_reset;
106};
107
108struct kvm_cpu_trap {
109	unsigned long sepc;
110	unsigned long scause;
111	unsigned long stval;
112	unsigned long htval;
113	unsigned long htinst;
114};
115
116struct kvm_cpu_context {
117	unsigned long zero;
118	unsigned long ra;
119	unsigned long sp;
120	unsigned long gp;
121	unsigned long tp;
122	unsigned long t0;
123	unsigned long t1;
124	unsigned long t2;
125	unsigned long s0;
126	unsigned long s1;
127	unsigned long a0;
128	unsigned long a1;
129	unsigned long a2;
130	unsigned long a3;
131	unsigned long a4;
132	unsigned long a5;
133	unsigned long a6;
134	unsigned long a7;
135	unsigned long s2;
136	unsigned long s3;
137	unsigned long s4;
138	unsigned long s5;
139	unsigned long s6;
140	unsigned long s7;
141	unsigned long s8;
142	unsigned long s9;
143	unsigned long s10;
144	unsigned long s11;
145	unsigned long t3;
146	unsigned long t4;
147	unsigned long t5;
148	unsigned long t6;
149	unsigned long sepc;
150	unsigned long sstatus;
151	unsigned long hstatus;
152	union __riscv_fp_state fp;
153	struct __riscv_v_ext_state vector;
154};
155
156struct kvm_vcpu_csr {
157	unsigned long vsstatus;
158	unsigned long vsie;
159	unsigned long vstvec;
160	unsigned long vsscratch;
161	unsigned long vsepc;
162	unsigned long vscause;
163	unsigned long vstval;
164	unsigned long hvip;
165	unsigned long vsatp;
166	unsigned long scounteren;
167	unsigned long senvcfg;
168};
169
170struct kvm_vcpu_config {
171	u64 henvcfg;
172	u64 hstateen0;
173	unsigned long hedeleg;
174};
175
176struct kvm_vcpu_smstateen_csr {
177	unsigned long sstateen0;
178};
179
180struct kvm_vcpu_reset_state {
181	spinlock_t lock;
182	unsigned long pc;
183	unsigned long a1;
184};
185
186struct kvm_vcpu_arch {
187	/* VCPU ran at least once */
188	bool ran_atleast_once;
189
190	/* Last Host CPU on which Guest VCPU exited */
191	int last_exit_cpu;
192
193	/* ISA feature bits (similar to MISA) */
194	DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX);
195
196	/* Vendor, Arch, and Implementation details */
197	unsigned long mvendorid;
198	unsigned long marchid;
199	unsigned long mimpid;
200
201	/* SSCRATCH, STVEC, and SCOUNTEREN of Host */
202	unsigned long host_sscratch;
203	unsigned long host_stvec;
204	unsigned long host_scounteren;
205	unsigned long host_senvcfg;
206	unsigned long host_sstateen0;
207
208	/* CPU context of Host */
209	struct kvm_cpu_context host_context;
210
211	/* CPU context of Guest VCPU */
212	struct kvm_cpu_context guest_context;
213
214	/* CPU CSR context of Guest VCPU */
215	struct kvm_vcpu_csr guest_csr;
216
217	/* CPU Smstateen CSR context of Guest VCPU */
218	struct kvm_vcpu_smstateen_csr smstateen_csr;
219
220	/* CPU reset state of Guest VCPU */
221	struct kvm_vcpu_reset_state reset_state;
222
223	/*
224	 * VCPU interrupts
225	 *
226	 * We have a lockless approach for tracking pending VCPU interrupts
227	 * implemented using atomic bitops. The irqs_pending bitmap represent
228	 * pending interrupts whereas irqs_pending_mask represent bits changed
229	 * in irqs_pending. Our approach is modeled around multiple producer
230	 * and single consumer problem where the consumer is the VCPU itself.
231	 */
232#define KVM_RISCV_VCPU_NR_IRQS	64
233	DECLARE_BITMAP(irqs_pending, KVM_RISCV_VCPU_NR_IRQS);
234	DECLARE_BITMAP(irqs_pending_mask, KVM_RISCV_VCPU_NR_IRQS);
235
236	/* VCPU Timer */
237	struct kvm_vcpu_timer timer;
238
239	/* HFENCE request queue */
240	spinlock_t hfence_lock;
241	unsigned long hfence_head;
242	unsigned long hfence_tail;
243	struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE];
244
245	/* MMIO instruction details */
246	struct kvm_mmio_decode mmio_decode;
247
248	/* CSR instruction details */
249	struct kvm_csr_decode csr_decode;
250
251	/* SBI context */
252	struct kvm_vcpu_sbi_context sbi_context;
253
254	/* AIA VCPU context */
255	struct kvm_vcpu_aia aia_context;
256
257	/* Cache pages needed to program page tables with spinlock held */
258	struct kvm_mmu_memory_cache mmu_page_cache;
259
260	/* VCPU power state */
261	struct kvm_mp_state mp_state;
262	spinlock_t mp_state_lock;
263
264	/* Don't run the VCPU (blocked) */
265	bool pause;
266
267	/* Performance monitoring context */
268	struct kvm_pmu pmu_context;
269
270	/* Firmware feature SBI extension context */
271	struct kvm_sbi_fwft fwft_context;
272
273	/* 'static' configurations which are set only once */
274	struct kvm_vcpu_config cfg;
275
276	/* SBI steal-time accounting */
277	struct {
278		gpa_t shmem;
279		u64 last_steal;
280	} sta;
281};
282
283/*
284 * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf event,
285 * arrived in guest context.  For riscv, any event that arrives while a vCPU is
286 * loaded is considered to be "in guest".
287 */
288static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu)
289{
290	return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu;
291}
292
293static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
294static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
295
296int kvm_riscv_setup_default_irq_routing(struct kvm *kvm, u32 lines);
297
298void __kvm_riscv_unpriv_trap(void);
299
300unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu,
301					 bool read_insn,
302					 unsigned long guest_addr,
303					 struct kvm_cpu_trap *trap);
304void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
305				  struct kvm_cpu_trap *trap);
306int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
307			struct kvm_cpu_trap *trap);
308
309void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch);
310
311void kvm_riscv_vcpu_setup_isa(struct kvm_vcpu *vcpu);
312unsigned long kvm_riscv_vcpu_num_regs(struct kvm_vcpu *vcpu);
313int kvm_riscv_vcpu_copy_reg_indices(struct kvm_vcpu *vcpu,
314				    u64 __user *uindices);
315int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
316			   const struct kvm_one_reg *reg);
317int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
318			   const struct kvm_one_reg *reg);
319
320int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
321int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
322void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu);
323void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu);
324bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask);
325void __kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
326void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
327void __kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
328void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
329bool kvm_riscv_vcpu_stopped(struct kvm_vcpu *vcpu);
330
331void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu);
332
333/* Flags representing implementation specific details */
334DECLARE_STATIC_KEY_FALSE(kvm_riscv_vsstage_tlb_no_gpa);
335
336#endif /* __RISCV_KVM_HOST_H__ */