xref: /linux/arch/riscv/include/asm/kvm_host.h (revision 51d90a15fedf8366cb96ef68d0ea2d0bf15417d2)
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 
65 struct kvm_vm_stat {
66 	struct kvm_vm_stat_generic generic;
67 };
68 
69 struct 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 
87 struct kvm_arch_memory_slot {
88 };
89 
90 struct 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 
108 struct 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 
116 struct 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 
156 struct 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 
170 struct kvm_vcpu_config {
171 	u64 henvcfg;
172 	u64 hstateen0;
173 	unsigned long hedeleg;
174 };
175 
176 struct kvm_vcpu_smstateen_csr {
177 	unsigned long sstateen0;
178 };
179 
180 struct kvm_vcpu_reset_state {
181 	spinlock_t lock;
182 	unsigned long pc;
183 	unsigned long a1;
184 };
185 
186 struct 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  */
kvm_arch_pmi_in_guest(struct kvm_vcpu * vcpu)288 static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu)
289 {
290 	return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu;
291 }
292 
kvm_arch_vcpu_blocking(struct kvm_vcpu * vcpu)293 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
kvm_arch_vcpu_unblocking(struct kvm_vcpu * vcpu)294 static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}
295 
296 int kvm_riscv_setup_default_irq_routing(struct kvm *kvm, u32 lines);
297 
298 void __kvm_riscv_unpriv_trap(void);
299 
300 unsigned 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);
304 void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
305 				  struct kvm_cpu_trap *trap);
306 int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
307 			struct kvm_cpu_trap *trap);
308 
309 void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch);
310 
311 void kvm_riscv_vcpu_setup_isa(struct kvm_vcpu *vcpu);
312 unsigned long kvm_riscv_vcpu_num_regs(struct kvm_vcpu *vcpu);
313 int kvm_riscv_vcpu_copy_reg_indices(struct kvm_vcpu *vcpu,
314 				    u64 __user *uindices);
315 int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
316 			   const struct kvm_one_reg *reg);
317 int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
318 			   const struct kvm_one_reg *reg);
319 
320 int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
321 int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
322 void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu);
323 void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu);
324 bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask);
325 void __kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
326 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
327 void __kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
328 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
329 bool kvm_riscv_vcpu_stopped(struct kvm_vcpu *vcpu);
330 
331 void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu);
332 
333 /* Flags representing implementation specific details */
334 DECLARE_STATIC_KEY_FALSE(kvm_riscv_vsstage_tlb_no_gpa);
335 
336 #endif /* __RISCV_KVM_HOST_H__ */
337