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/csr.h>
17 #include <asm/hwcap.h>
18 #include <asm/kvm_vcpu_fp.h>
19 #include <asm/kvm_vcpu_insn.h>
20 #include <asm/kvm_vcpu_timer.h>
21
22 #define KVM_MAX_VCPUS 1024
23
24 #define KVM_HALT_POLL_NS_DEFAULT 500000
25
26 #define KVM_VCPU_MAX_FEATURES 0
27
28 #define KVM_REQ_SLEEP \
29 KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
30 #define KVM_REQ_VCPU_RESET KVM_ARCH_REQ(1)
31 #define KVM_REQ_UPDATE_HGATP KVM_ARCH_REQ(2)
32 #define KVM_REQ_FENCE_I \
33 KVM_ARCH_REQ_FLAGS(3, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
34 #define KVM_REQ_HFENCE_GVMA_VMID_ALL KVM_REQ_TLB_FLUSH
35 #define KVM_REQ_HFENCE_VVMA_ALL \
36 KVM_ARCH_REQ_FLAGS(4, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
37 #define KVM_REQ_HFENCE \
38 KVM_ARCH_REQ_FLAGS(5, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
39
40 enum kvm_riscv_hfence_type {
41 KVM_RISCV_HFENCE_UNKNOWN = 0,
42 KVM_RISCV_HFENCE_GVMA_VMID_GPA,
43 KVM_RISCV_HFENCE_VVMA_ASID_GVA,
44 KVM_RISCV_HFENCE_VVMA_ASID_ALL,
45 KVM_RISCV_HFENCE_VVMA_GVA,
46 };
47
48 struct kvm_riscv_hfence {
49 enum kvm_riscv_hfence_type type;
50 unsigned long asid;
51 unsigned long order;
52 gpa_t addr;
53 gpa_t size;
54 };
55
56 #define KVM_RISCV_VCPU_MAX_HFENCE 64
57
58 struct kvm_vm_stat {
59 struct kvm_vm_stat_generic generic;
60 };
61
62 struct kvm_vcpu_stat {
63 struct kvm_vcpu_stat_generic generic;
64 u64 ecall_exit_stat;
65 u64 wfi_exit_stat;
66 u64 mmio_exit_user;
67 u64 mmio_exit_kernel;
68 u64 csr_exit_user;
69 u64 csr_exit_kernel;
70 u64 signal_exits;
71 u64 exits;
72 };
73
74 struct kvm_arch_memory_slot {
75 };
76
77 struct kvm_vmid {
78 /*
79 * Writes to vmid_version and vmid happen with vmid_lock held
80 * whereas reads happen without any lock held.
81 */
82 unsigned long vmid_version;
83 unsigned long vmid;
84 };
85
86 struct kvm_arch {
87 /* G-stage vmid */
88 struct kvm_vmid vmid;
89
90 /* G-stage page table */
91 pgd_t *pgd;
92 phys_addr_t pgd_phys;
93
94 /* Guest Timer */
95 struct kvm_guest_timer timer;
96 };
97
98 struct kvm_sbi_context {
99 int return_handled;
100 };
101
102 struct kvm_cpu_trap {
103 unsigned long sepc;
104 unsigned long scause;
105 unsigned long stval;
106 unsigned long htval;
107 unsigned long htinst;
108 };
109
110 struct kvm_cpu_context {
111 unsigned long zero;
112 unsigned long ra;
113 unsigned long sp;
114 unsigned long gp;
115 unsigned long tp;
116 unsigned long t0;
117 unsigned long t1;
118 unsigned long t2;
119 unsigned long s0;
120 unsigned long s1;
121 unsigned long a0;
122 unsigned long a1;
123 unsigned long a2;
124 unsigned long a3;
125 unsigned long a4;
126 unsigned long a5;
127 unsigned long a6;
128 unsigned long a7;
129 unsigned long s2;
130 unsigned long s3;
131 unsigned long s4;
132 unsigned long s5;
133 unsigned long s6;
134 unsigned long s7;
135 unsigned long s8;
136 unsigned long s9;
137 unsigned long s10;
138 unsigned long s11;
139 unsigned long t3;
140 unsigned long t4;
141 unsigned long t5;
142 unsigned long t6;
143 unsigned long sepc;
144 unsigned long sstatus;
145 unsigned long hstatus;
146 union __riscv_fp_state fp;
147 };
148
149 struct kvm_vcpu_csr {
150 unsigned long vsstatus;
151 unsigned long vsie;
152 unsigned long vstvec;
153 unsigned long vsscratch;
154 unsigned long vsepc;
155 unsigned long vscause;
156 unsigned long vstval;
157 unsigned long hvip;
158 unsigned long vsatp;
159 unsigned long scounteren;
160 };
161
162 struct kvm_vcpu_arch {
163 /* VCPU ran at least once */
164 bool ran_atleast_once;
165
166 /* Last Host CPU on which Guest VCPU exited */
167 int last_exit_cpu;
168
169 /* ISA feature bits (similar to MISA) */
170 DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX);
171
172 /* SSCRATCH, STVEC, and SCOUNTEREN of Host */
173 unsigned long host_sscratch;
174 unsigned long host_stvec;
175 unsigned long host_scounteren;
176
177 /* CPU context of Host */
178 struct kvm_cpu_context host_context;
179
180 /* CPU context of Guest VCPU */
181 struct kvm_cpu_context guest_context;
182
183 /* CPU CSR context of Guest VCPU */
184 struct kvm_vcpu_csr guest_csr;
185
186 /* CPU context upon Guest VCPU reset */
187 struct kvm_cpu_context guest_reset_context;
188
189 /* CPU CSR context upon Guest VCPU reset */
190 struct kvm_vcpu_csr guest_reset_csr;
191
192 /*
193 * VCPU interrupts
194 *
195 * We have a lockless approach for tracking pending VCPU interrupts
196 * implemented using atomic bitops. The irqs_pending bitmap represent
197 * pending interrupts whereas irqs_pending_mask represent bits changed
198 * in irqs_pending. Our approach is modeled around multiple producer
199 * and single consumer problem where the consumer is the VCPU itself.
200 */
201 unsigned long irqs_pending;
202 unsigned long irqs_pending_mask;
203
204 /* VCPU Timer */
205 struct kvm_vcpu_timer timer;
206
207 /* HFENCE request queue */
208 spinlock_t hfence_lock;
209 unsigned long hfence_head;
210 unsigned long hfence_tail;
211 struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE];
212
213 /* MMIO instruction details */
214 struct kvm_mmio_decode mmio_decode;
215
216 /* CSR instruction details */
217 struct kvm_csr_decode csr_decode;
218
219 /* SBI context */
220 struct kvm_sbi_context sbi_context;
221
222 /* Cache pages needed to program page tables with spinlock held */
223 struct kvm_mmu_memory_cache mmu_page_cache;
224
225 /* VCPU power-off state */
226 bool power_off;
227
228 /* Don't run the VCPU (blocked) */
229 bool pause;
230 };
231
kvm_arch_hardware_unsetup(void)232 static inline void kvm_arch_hardware_unsetup(void) {}
kvm_arch_sync_events(struct kvm * kvm)233 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
kvm_arch_sched_in(struct kvm_vcpu * vcpu,int cpu)234 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
235
236 #define KVM_ARCH_WANT_MMU_NOTIFIER
237
238 #define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12
239
240 void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid,
241 gpa_t gpa, gpa_t gpsz,
242 unsigned long order);
243 void kvm_riscv_local_hfence_gvma_vmid_all(unsigned long vmid);
244 void kvm_riscv_local_hfence_gvma_gpa(gpa_t gpa, gpa_t gpsz,
245 unsigned long order);
246 void kvm_riscv_local_hfence_gvma_all(void);
247 void kvm_riscv_local_hfence_vvma_asid_gva(unsigned long vmid,
248 unsigned long asid,
249 unsigned long gva,
250 unsigned long gvsz,
251 unsigned long order);
252 void kvm_riscv_local_hfence_vvma_asid_all(unsigned long vmid,
253 unsigned long asid);
254 void kvm_riscv_local_hfence_vvma_gva(unsigned long vmid,
255 unsigned long gva, unsigned long gvsz,
256 unsigned long order);
257 void kvm_riscv_local_hfence_vvma_all(unsigned long vmid);
258
259 void kvm_riscv_local_tlb_sanitize(struct kvm_vcpu *vcpu);
260
261 void kvm_riscv_fence_i_process(struct kvm_vcpu *vcpu);
262 void kvm_riscv_hfence_gvma_vmid_all_process(struct kvm_vcpu *vcpu);
263 void kvm_riscv_hfence_vvma_all_process(struct kvm_vcpu *vcpu);
264 void kvm_riscv_hfence_process(struct kvm_vcpu *vcpu);
265
266 void kvm_riscv_fence_i(struct kvm *kvm,
267 unsigned long hbase, unsigned long hmask);
268 void kvm_riscv_hfence_gvma_vmid_gpa(struct kvm *kvm,
269 unsigned long hbase, unsigned long hmask,
270 gpa_t gpa, gpa_t gpsz,
271 unsigned long order);
272 void kvm_riscv_hfence_gvma_vmid_all(struct kvm *kvm,
273 unsigned long hbase, unsigned long hmask);
274 void kvm_riscv_hfence_vvma_asid_gva(struct kvm *kvm,
275 unsigned long hbase, unsigned long hmask,
276 unsigned long gva, unsigned long gvsz,
277 unsigned long order, unsigned long asid);
278 void kvm_riscv_hfence_vvma_asid_all(struct kvm *kvm,
279 unsigned long hbase, unsigned long hmask,
280 unsigned long asid);
281 void kvm_riscv_hfence_vvma_gva(struct kvm *kvm,
282 unsigned long hbase, unsigned long hmask,
283 unsigned long gva, unsigned long gvsz,
284 unsigned long order);
285 void kvm_riscv_hfence_vvma_all(struct kvm *kvm,
286 unsigned long hbase, unsigned long hmask);
287
288 int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa,
289 phys_addr_t hpa, unsigned long size,
290 bool writable, bool in_atomic);
291 void kvm_riscv_gstage_iounmap(struct kvm *kvm, gpa_t gpa,
292 unsigned long size);
293 int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
294 struct kvm_memory_slot *memslot,
295 gpa_t gpa, unsigned long hva, bool is_write);
296 int kvm_riscv_gstage_alloc_pgd(struct kvm *kvm);
297 void kvm_riscv_gstage_free_pgd(struct kvm *kvm);
298 void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu);
299 void kvm_riscv_gstage_mode_detect(void);
300 unsigned long kvm_riscv_gstage_mode(void);
301 int kvm_riscv_gstage_gpa_bits(void);
302
303 void kvm_riscv_gstage_vmid_detect(void);
304 unsigned long kvm_riscv_gstage_vmid_bits(void);
305 int kvm_riscv_gstage_vmid_init(struct kvm *kvm);
306 bool kvm_riscv_gstage_vmid_ver_changed(struct kvm_vmid *vmid);
307 void kvm_riscv_gstage_vmid_update(struct kvm_vcpu *vcpu);
308
309 void __kvm_riscv_unpriv_trap(void);
310
311 unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu,
312 bool read_insn,
313 unsigned long guest_addr,
314 struct kvm_cpu_trap *trap);
315 void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
316 struct kvm_cpu_trap *trap);
317 int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
318 struct kvm_cpu_trap *trap);
319
320 void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch);
321
322 int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
323 int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq);
324 void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu);
325 void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu);
326 bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, unsigned long mask);
327 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu);
328 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu);
329
330 int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run);
331 int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run);
332
333 #endif /* __RISCV_KVM_HOST_H__ */
334
