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