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_vcpu_fp.h>
20 #include <asm/kvm_vcpu_insn.h>
21 #include <asm/kvm_vcpu_sbi.h>
22 #include <asm/kvm_vcpu_timer.h>
23 #include <asm/kvm_vcpu_pmu.h>
24
25 #define KVM_MAX_VCPUS 1024
26
27 #define KVM_HALT_POLL_NS_DEFAULT 500000
28
29 #define KVM_VCPU_MAX_FEATURES 0
30
31 #define KVM_IRQCHIP_NUM_PINS 1024
32
33 #define KVM_REQ_SLEEP \
34 KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
35 #define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(1)
36 #define KVM_REQ_UPDATE_HGATP KVM_ARCH_REQ(2)
37 #define KVM_REQ_FENCE_I \
38 KVM_ARCH_REQ_FLAGS(3, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
39 #define KVM_REQ_HFENCE_GVMA_VMID_ALL KVM_REQ_TLB_FLUSH
40 #define KVM_REQ_HFENCE_VVMA_ALL \
41 KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
42 #define KVM_REQ_HFENCE \
43 KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
44 #define KVM_REQ_STEAL_UPDATE KVM_ARCH_REQ(6)
45
46 #define KVM_HEDELEG_DEFAULT (BIT(EXC_INST_MISALIGNED) | \
47 BIT(EXC_BREAKPOINT) | \
48 BIT(EXC_SYSCALL) | \
49 BIT(EXC_INST_PAGE_FAULT) | \
50 BIT(EXC_LOAD_PAGE_FAULT) | \
51 BIT(EXC_STORE_PAGE_FAULT))
52
53 #define KVM_HIDELEG_DEFAULT (BIT(IRQ_VS_SOFT) | \
54 BIT(IRQ_VS_TIMER) | \
55 BIT(IRQ_VS_EXT))
56
57 enum kvm_riscv_hfence_type {
58 KVM_RISCV_HFENCE_UNKNOWN = 0,
59 KVM_RISCV_HFENCE_GVMA_VMID_GPA,
60 KVM_RISCV_HFENCE_VVMA_ASID_GVA,
61 KVM_RISCV_HFENCE_VVMA_ASID_ALL,
62 KVM_RISCV_HFENCE_VVMA_GVA,
63 };
64
65 struct kvm_riscv_hfence {
66 enum kvm_riscv_hfence_type type;
67 unsigned long asid;
68 unsigned long order;
69 gpa_t addr;
70 gpa_t size;
71 };
72
73 #define KVM_RISCV_VCPU_MAX_HFENCE 64
74
75 struct kvm_vm_stat {
76 struct kvm_vm_stat_generic generic;
77 };
78
79 struct kvm_vcpu_stat {
80 struct kvm_vcpu_stat_generic generic;
81 u64 ecall_exit_stat;
82 u64 wfi_exit_stat;
83 u64 wrs_exit_stat;
84 u64 mmio_exit_user;
85 u64 mmio_exit_kernel;
86 u64 csr_exit_user;
87 u64 csr_exit_kernel;
88 u64 signal_exits;
89 u64 exits;
90 u64 instr_illegal_exits;
91 u64 load_misaligned_exits;
92 u64 store_misaligned_exits;
93 u64 load_access_exits;
94 u64 store_access_exits;
95 };
96
97 struct kvm_arch_memory_slot {
98 };
99
100 struct kvm_vmid {
101 /*
102 * Writes to vmid_version and vmid happen with vmid_lock held
103 * whereas reads happen without any lock held.
104 */
105 unsigned long vmid_version;
106 unsigned long vmid;
107 };
108
109 struct kvm_arch {
110 /* G-stage vmid */
111 struct kvm_vmid vmid;
112
113 /* G-stage page table */
114 pgd_t *pgd;
115 phys_addr_t pgd_phys;
116
117 /* Guest Timer */
118 struct kvm_guest_timer timer;
119
120 /* AIA Guest/VM context */
121 struct kvm_aia aia;
122
123 /* KVM_CAP_RISCV_MP_STATE_RESET */
124 bool mp_state_reset;
125 };
126
127 struct kvm_cpu_trap {
128 unsigned long sepc;
129 unsigned long scause;
130 unsigned long stval;
131 unsigned long htval;
132 unsigned long htinst;
133 };
134
135 struct kvm_cpu_context {
136 unsigned long zero;
137 unsigned long ra;
138 unsigned long sp;
139 unsigned long gp;
140 unsigned long tp;
141 unsigned long t0;
142 unsigned long t1;
143 unsigned long t2;
144 unsigned long s0;
145 unsigned long s1;
146 unsigned long a0;
147 unsigned long a1;
148 unsigned long a2;
149 unsigned long a3;
150 unsigned long a4;
151 unsigned long a5;
152 unsigned long a6;
153 unsigned long a7;
154 unsigned long s2;
155 unsigned long s3;
156 unsigned long s4;
157 unsigned long s5;
158 unsigned long s6;
159 unsigned long s7;
160 unsigned long s8;
161 unsigned long s9;
162 unsigned long s10;
163 unsigned long s11;
164 unsigned long t3;
165 unsigned long t4;
166 unsigned long t5;
167 unsigned long t6;
168 unsigned long sepc;
169 unsigned long sstatus;
170 unsigned long hstatus;
171 union __riscv_fp_state fp;
172 struct __riscv_v_ext_state vector;
173 };
174
175 struct kvm_vcpu_csr {
176 unsigned long vsstatus;
177 unsigned long vsie;
178 unsigned long vstvec;
179 unsigned long vsscratch;
180 unsigned long vsepc;
181 unsigned long vscause;
182 unsigned long vstval;
183 unsigned long hvip;
184 unsigned long vsatp;
185 unsigned long scounteren;
186 unsigned long senvcfg;
187 };
188
189 struct kvm_vcpu_config {
190 u64 henvcfg;
191 u64 hstateen0;
192 unsigned long hedeleg;
193 };
194
195 struct kvm_vcpu_smstateen_csr {
196 unsigned long sstateen0;
197 };
198
199 struct kvm_vcpu_reset_state {
200 spinlock_t lock;
201 unsigned long pc;
202 unsigned long a1;
203 };
204
205 struct kvm_vcpu_arch {
206 /* VCPU ran at least once */
207 bool ran_atleast_once;
208
209 /* Last Host CPU on which Guest VCPU exited */
210 int last_exit_cpu;
211
212 /* ISA feature bits (similar to MISA) */
213 DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX);
214
215 /* Vendor, Arch, and Implementation details */
216 unsigned long mvendorid;
217 unsigned long marchid;
218 unsigned long mimpid;
219
220 /* SSCRATCH, STVEC, and SCOUNTEREN of Host */
221 unsigned long host_sscratch;
222 unsigned long host_stvec;
223 unsigned long host_scounteren;
224 unsigned long host_senvcfg;
225 unsigned long host_sstateen0;
226
227 /* CPU context of Host */
228 struct kvm_cpu_context host_context;
229
230 /* CPU context of Guest VCPU */
231 struct kvm_cpu_context guest_context;
232
233 /* CPU CSR context of Guest VCPU */
234 struct kvm_vcpu_csr guest_csr;
235
236 /* CPU Smstateen CSR context of Guest VCPU */
237 struct kvm_vcpu_smstateen_csr smstateen_csr;
238
239 /* CPU reset state of Guest VCPU */
240 struct kvm_vcpu_reset_state reset_state;
241
242 /*
243 * VCPU interrupts
244 *
245 * We have a lockless approach for tracking pending VCPU interrupts
246 * implemented using atomic bitops. The irqs_pending bitmap represent
247 * pending interrupts whereas irqs_pending_mask represent bits changed
248 * in irqs_pending. Our approach is modeled around multiple producer
249 * and single consumer problem where the consumer is the VCPU itself.
250 */
251 #define KVM_RISCV_VCPU_NR_IRQS 64
252 DECLARE_BITMAP(irqs_pending, KVM_RISCV_VCPU_NR_IRQS);
253 DECLARE_BITMAP(irqs_pending_mask, KVM_RISCV_VCPU_NR_IRQS);
254
255 /* VCPU Timer */
256 struct kvm_vcpu_timer timer;
257
258 /* HFENCE request queue */
259 spinlock_t hfence_lock;
260 unsigned long hfence_head;
261 unsigned long hfence_tail;
262 struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE];
263
264 /* MMIO instruction details */
265 struct kvm_mmio_decode mmio_decode;
266
267 /* CSR instruction details */
268 struct kvm_csr_decode csr_decode;
269
270 /* SBI context */
271 struct kvm_vcpu_sbi_context sbi_context;
272
273 /* AIA VCPU context */
274 struct kvm_vcpu_aia aia_context;
275
276 /* Cache pages needed to program page tables with spinlock held */
277 struct kvm_mmu_memory_cache mmu_page_cache;
278
279 /* VCPU power state */
280 struct kvm_mp_state mp_state;
281 spinlock_t mp_state_lock;
282
283 /* Don't run the VCPU (blocked) */
284 bool pause;
285
286 /* Performance monitoring context */
287 struct kvm_pmu pmu_context;
288
289 /* 'static' configurations which are set only once */
290 struct kvm_vcpu_config cfg;
291
292 /* SBI steal-time accounting */
293 struct {
294 gpa_t shmem;
295 u64 last_steal;
296 } sta;
297 };
298
299 /*
300 * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf event,
301 * arrived in guest context. For riscv, any event that arrives while a vCPU is
302 * loaded is considered to be "in guest".
303 */
kvm_arch_pmi_in_guest(struct kvm_vcpu * vcpu)304 static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu)
305 {
306 return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu;
307 }
308
309 #define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12
310
311 void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid,
312 gpa_t gpa, gpa_t gpsz,
313 unsigned long order);
314 void kvm_riscv_local_hfence_gvma_vmid_all(unsigned long vmid);
315 void kvm_riscv_local_hfence_gvma_gpa(gpa_t gpa, gpa_t gpsz,
316 unsigned long order);
317 void kvm_riscv_local_hfence_gvma_all(void);
318 void kvm_riscv_local_hfence_vvma_asid_gva(unsigned long vmid,
319 unsigned long asid,
320 unsigned long gva,
321 unsigned long gvsz,
322 unsigned long order);
323 void kvm_riscv_local_hfence_vvma_asid_all(unsigned long vmid,
324 unsigned long asid);
325 void kvm_riscv_local_hfence_vvma_gva(unsigned long vmid,
326 unsigned long gva, unsigned long gvsz,
327 unsigned long order);
328 void kvm_riscv_local_hfence_vvma_all(unsigned long vmid);
329
330 void kvm_riscv_local_tlb_sanitize(struct kvm_vcpu *vcpu);
331
332 void kvm_riscv_fence_i_process(struct kvm_vcpu *vcpu);
333 void kvm_riscv_hfence_gvma_vmid_all_process(struct kvm_vcpu *vcpu);
334 void kvm_riscv_hfence_vvma_all_process(struct kvm_vcpu *vcpu);
335 void kvm_riscv_hfence_process(struct kvm_vcpu *vcpu);
336
337 void kvm_riscv_fence_i(struct kvm *kvm,
338 unsigned long hbase, unsigned long hmask);
339 void kvm_riscv_hfence_gvma_vmid_gpa(struct kvm *kvm,
340 unsigned long hbase, unsigned long hmask,
341 gpa_t gpa, gpa_t gpsz,
342 unsigned long order);
343 void kvm_riscv_hfence_gvma_vmid_all(struct kvm *kvm,
344 unsigned long hbase, unsigned long hmask);
345 void kvm_riscv_hfence_vvma_asid_gva(struct kvm *kvm,
346 unsigned long hbase, unsigned long hmask,
347 unsigned long gva, unsigned long gvsz,
348 unsigned long order, unsigned long asid);
349 void kvm_riscv_hfence_vvma_asid_all(struct kvm *kvm,
350 unsigned long hbase, unsigned long hmask,
351 unsigned long asid);
352 void kvm_riscv_hfence_vvma_gva(struct kvm *kvm,
353 unsigned long hbase, unsigned long hmask,
354 unsigned long gva, unsigned long gvsz,
355 unsigned long order);
356 void kvm_riscv_hfence_vvma_all(struct kvm *kvm,
357 unsigned long hbase, unsigned long hmask);
358
359 int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa,
360 phys_addr_t hpa, unsigned long size,
361 bool writable, bool in_atomic);
362 void kvm_riscv_gstage_iounmap(struct kvm *kvm, gpa_t gpa,
363 unsigned long size);
364 int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
365 struct kvm_memory_slot *memslot,
366 gpa_t gpa, unsigned long hva, bool is_write);
367 int kvm_riscv_gstage_alloc_pgd(struct kvm *kvm);
368 void kvm_riscv_gstage_free_pgd(struct kvm *kvm);
369 void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu);
370 void __init kvm_riscv_gstage_mode_detect(void);
371 unsigned long __init kvm_riscv_gstage_mode(void);
372 int kvm_riscv_gstage_gpa_bits(void);
373
374 void __init kvm_riscv_gstage_vmid_detect(void);
375 unsigned long kvm_riscv_gstage_vmid_bits(void);
376 int kvm_riscv_gstage_vmid_init(struct kvm *kvm);
377 bool kvm_riscv_gstage_vmid_ver_changed(struct kvm_vmid *vmid);
378 void kvm_riscv_gstage_vmid_update(struct kvm_vcpu *vcpu);
379
380 int kvm_riscv_setup_default_irq_routing(struct kvm *kvm, u32 lines);
381
382 void __kvm_riscv_unpriv_trap(void);
383
384 unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu,
385 bool read_insn,
386 unsigned long guest_addr,
387 struct kvm_cpu_trap *trap);
388 void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
389 struct kvm_cpu_trap *trap);
390 int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
391 struct kvm_cpu_trap *trap);
392
393 void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch);
394
395 void kvm_riscv_vcpu_setup_isa(struct kvm_vcpu *vcpu);
396 unsigned long kvm_riscv_vcpu_num_regs(struct kvm_vcpu *vcpu);
397 int kvm_riscv_vcpu_copy_reg_indices(struct kvm_vcpu *vcpu,
398 u64 __user *uindices);
399 int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu,
400 const struct kvm_one_reg *reg);
401 int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu,
402 const struct kvm_one_reg *reg);
403
404 int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
405 int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
406 void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu);
407 void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu);
408 bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask);
409 void __kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
410 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
411 void __kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
412 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
413 bool kvm_riscv_vcpu_stopped(struct kvm_vcpu *vcpu);
414
415 void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu);
416 void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu);
417
418 #endif /* __RISCV_KVM_HOST_H__ */
419