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 exits; 71 }; 72 73 struct kvm_arch_memory_slot { 74 }; 75 76 struct kvm_vmid { 77 /* 78 * Writes to vmid_version and vmid happen with vmid_lock held 79 * whereas reads happen without any lock held. 80 */ 81 unsigned long vmid_version; 82 unsigned long vmid; 83 }; 84 85 struct kvm_arch { 86 /* G-stage vmid */ 87 struct kvm_vmid vmid; 88 89 /* G-stage page table */ 90 pgd_t *pgd; 91 phys_addr_t pgd_phys; 92 93 /* Guest Timer */ 94 struct kvm_guest_timer timer; 95 }; 96 97 struct kvm_sbi_context { 98 int return_handled; 99 }; 100 101 struct kvm_cpu_trap { 102 unsigned long sepc; 103 unsigned long scause; 104 unsigned long stval; 105 unsigned long htval; 106 unsigned long htinst; 107 }; 108 109 struct kvm_cpu_context { 110 unsigned long zero; 111 unsigned long ra; 112 unsigned long sp; 113 unsigned long gp; 114 unsigned long tp; 115 unsigned long t0; 116 unsigned long t1; 117 unsigned long t2; 118 unsigned long s0; 119 unsigned long s1; 120 unsigned long a0; 121 unsigned long a1; 122 unsigned long a2; 123 unsigned long a3; 124 unsigned long a4; 125 unsigned long a5; 126 unsigned long a6; 127 unsigned long a7; 128 unsigned long s2; 129 unsigned long s3; 130 unsigned long s4; 131 unsigned long s5; 132 unsigned long s6; 133 unsigned long s7; 134 unsigned long s8; 135 unsigned long s9; 136 unsigned long s10; 137 unsigned long s11; 138 unsigned long t3; 139 unsigned long t4; 140 unsigned long t5; 141 unsigned long t6; 142 unsigned long sepc; 143 unsigned long sstatus; 144 unsigned long hstatus; 145 union __riscv_fp_state fp; 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 }; 160 161 struct kvm_vcpu_arch { 162 /* VCPU ran at least once */ 163 bool ran_atleast_once; 164 165 /* Last Host CPU on which Guest VCPU exited */ 166 int last_exit_cpu; 167 168 /* ISA feature bits (similar to MISA) */ 169 DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX); 170 171 /* SSCRATCH, STVEC, and SCOUNTEREN of Host */ 172 unsigned long host_sscratch; 173 unsigned long host_stvec; 174 unsigned long host_scounteren; 175 176 /* CPU context of Host */ 177 struct kvm_cpu_context host_context; 178 179 /* CPU context of Guest VCPU */ 180 struct kvm_cpu_context guest_context; 181 182 /* CPU CSR context of Guest VCPU */ 183 struct kvm_vcpu_csr guest_csr; 184 185 /* CPU context upon Guest VCPU reset */ 186 struct kvm_cpu_context guest_reset_context; 187 188 /* CPU CSR context upon Guest VCPU reset */ 189 struct kvm_vcpu_csr guest_reset_csr; 190 191 /* 192 * VCPU interrupts 193 * 194 * We have a lockless approach for tracking pending VCPU interrupts 195 * implemented using atomic bitops. The irqs_pending bitmap represent 196 * pending interrupts whereas irqs_pending_mask represent bits changed 197 * in irqs_pending. Our approach is modeled around multiple producer 198 * and single consumer problem where the consumer is the VCPU itself. 199 */ 200 unsigned long irqs_pending; 201 unsigned long irqs_pending_mask; 202 203 /* VCPU Timer */ 204 struct kvm_vcpu_timer timer; 205 206 /* HFENCE request queue */ 207 spinlock_t hfence_lock; 208 unsigned long hfence_head; 209 unsigned long hfence_tail; 210 struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE]; 211 212 /* MMIO instruction details */ 213 struct kvm_mmio_decode mmio_decode; 214 215 /* CSR instruction details */ 216 struct kvm_csr_decode csr_decode; 217 218 /* SBI context */ 219 struct kvm_sbi_context sbi_context; 220 221 /* Cache pages needed to program page tables with spinlock held */ 222 struct kvm_mmu_memory_cache mmu_page_cache; 223 224 /* VCPU power-off state */ 225 bool power_off; 226 227 /* Don't run the VCPU (blocked) */ 228 bool pause; 229 }; 230 231 static inline void kvm_arch_hardware_unsetup(void) {} 232 static inline void kvm_arch_sync_events(struct kvm *kvm) {} 233 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {} 234 235 #define KVM_ARCH_WANT_MMU_NOTIFIER 236 237 #define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12 238 239 void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid, 240 gpa_t gpa, gpa_t gpsz, 241 unsigned long order); 242 void kvm_riscv_local_hfence_gvma_vmid_all(unsigned long vmid); 243 void kvm_riscv_local_hfence_gvma_gpa(gpa_t gpa, gpa_t gpsz, 244 unsigned long order); 245 void kvm_riscv_local_hfence_gvma_all(void); 246 void kvm_riscv_local_hfence_vvma_asid_gva(unsigned long vmid, 247 unsigned long asid, 248 unsigned long gva, 249 unsigned long gvsz, 250 unsigned long order); 251 void kvm_riscv_local_hfence_vvma_asid_all(unsigned long vmid, 252 unsigned long asid); 253 void kvm_riscv_local_hfence_vvma_gva(unsigned long vmid, 254 unsigned long gva, unsigned long gvsz, 255 unsigned long order); 256 void kvm_riscv_local_hfence_vvma_all(unsigned long vmid); 257 258 void kvm_riscv_local_tlb_sanitize(struct kvm_vcpu *vcpu); 259 260 void kvm_riscv_fence_i_process(struct kvm_vcpu *vcpu); 261 void kvm_riscv_hfence_gvma_vmid_all_process(struct kvm_vcpu *vcpu); 262 void kvm_riscv_hfence_vvma_all_process(struct kvm_vcpu *vcpu); 263 void kvm_riscv_hfence_process(struct kvm_vcpu *vcpu); 264 265 void kvm_riscv_fence_i(struct kvm *kvm, 266 unsigned long hbase, unsigned long hmask); 267 void kvm_riscv_hfence_gvma_vmid_gpa(struct kvm *kvm, 268 unsigned long hbase, unsigned long hmask, 269 gpa_t gpa, gpa_t gpsz, 270 unsigned long order); 271 void kvm_riscv_hfence_gvma_vmid_all(struct kvm *kvm, 272 unsigned long hbase, unsigned long hmask); 273 void kvm_riscv_hfence_vvma_asid_gva(struct kvm *kvm, 274 unsigned long hbase, unsigned long hmask, 275 unsigned long gva, unsigned long gvsz, 276 unsigned long order, unsigned long asid); 277 void kvm_riscv_hfence_vvma_asid_all(struct kvm *kvm, 278 unsigned long hbase, unsigned long hmask, 279 unsigned long asid); 280 void kvm_riscv_hfence_vvma_gva(struct kvm *kvm, 281 unsigned long hbase, unsigned long hmask, 282 unsigned long gva, unsigned long gvsz, 283 unsigned long order); 284 void kvm_riscv_hfence_vvma_all(struct kvm *kvm, 285 unsigned long hbase, unsigned long hmask); 286 287 int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa, 288 phys_addr_t hpa, unsigned long size, 289 bool writable, bool in_atomic); 290 void kvm_riscv_gstage_iounmap(struct kvm *kvm, gpa_t gpa, 291 unsigned long size); 292 int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu, 293 struct kvm_memory_slot *memslot, 294 gpa_t gpa, unsigned long hva, bool is_write); 295 int kvm_riscv_gstage_alloc_pgd(struct kvm *kvm); 296 void kvm_riscv_gstage_free_pgd(struct kvm *kvm); 297 void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu); 298 void kvm_riscv_gstage_mode_detect(void); 299 unsigned long kvm_riscv_gstage_mode(void); 300 int kvm_riscv_gstage_gpa_bits(void); 301 302 void kvm_riscv_gstage_vmid_detect(void); 303 unsigned long kvm_riscv_gstage_vmid_bits(void); 304 int kvm_riscv_gstage_vmid_init(struct kvm *kvm); 305 bool kvm_riscv_gstage_vmid_ver_changed(struct kvm_vmid *vmid); 306 void kvm_riscv_gstage_vmid_update(struct kvm_vcpu *vcpu); 307 308 void __kvm_riscv_unpriv_trap(void); 309 310 unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu, 311 bool read_insn, 312 unsigned long guest_addr, 313 struct kvm_cpu_trap *trap); 314 void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu, 315 struct kvm_cpu_trap *trap); 316 int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, 317 struct kvm_cpu_trap *trap); 318 319 void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch); 320 321 int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); 322 int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); 323 void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu); 324 void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu); 325 bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, unsigned long mask); 326 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu); 327 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); 328 329 int kvm_riscv_vcpu_sbi_return(struct kvm_vcpu *vcpu, struct kvm_run *run); 330 int kvm_riscv_vcpu_sbi_ecall(struct kvm_vcpu *vcpu, struct kvm_run *run); 331 332 #endif /* __RISCV_KVM_HOST_H__ */ 333