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