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 mmio_exit_user; 84 u64 mmio_exit_kernel; 85 u64 csr_exit_user; 86 u64 csr_exit_kernel; 87 u64 signal_exits; 88 u64 exits; 89 }; 90 91 struct kvm_arch_memory_slot { 92 }; 93 94 struct kvm_vmid { 95 /* 96 * Writes to vmid_version and vmid happen with vmid_lock held 97 * whereas reads happen without any lock held. 98 */ 99 unsigned long vmid_version; 100 unsigned long vmid; 101 }; 102 103 struct kvm_arch { 104 /* G-stage vmid */ 105 struct kvm_vmid vmid; 106 107 /* G-stage page table */ 108 pgd_t *pgd; 109 phys_addr_t pgd_phys; 110 111 /* Guest Timer */ 112 struct kvm_guest_timer timer; 113 114 /* AIA Guest/VM context */ 115 struct kvm_aia aia; 116 }; 117 118 struct kvm_cpu_trap { 119 unsigned long sepc; 120 unsigned long scause; 121 unsigned long stval; 122 unsigned long htval; 123 unsigned long htinst; 124 }; 125 126 struct kvm_cpu_context { 127 unsigned long zero; 128 unsigned long ra; 129 unsigned long sp; 130 unsigned long gp; 131 unsigned long tp; 132 unsigned long t0; 133 unsigned long t1; 134 unsigned long t2; 135 unsigned long s0; 136 unsigned long s1; 137 unsigned long a0; 138 unsigned long a1; 139 unsigned long a2; 140 unsigned long a3; 141 unsigned long a4; 142 unsigned long a5; 143 unsigned long a6; 144 unsigned long a7; 145 unsigned long s2; 146 unsigned long s3; 147 unsigned long s4; 148 unsigned long s5; 149 unsigned long s6; 150 unsigned long s7; 151 unsigned long s8; 152 unsigned long s9; 153 unsigned long s10; 154 unsigned long s11; 155 unsigned long t3; 156 unsigned long t4; 157 unsigned long t5; 158 unsigned long t6; 159 unsigned long sepc; 160 unsigned long sstatus; 161 unsigned long hstatus; 162 union __riscv_fp_state fp; 163 struct __riscv_v_ext_state vector; 164 }; 165 166 struct kvm_vcpu_csr { 167 unsigned long vsstatus; 168 unsigned long vsie; 169 unsigned long vstvec; 170 unsigned long vsscratch; 171 unsigned long vsepc; 172 unsigned long vscause; 173 unsigned long vstval; 174 unsigned long hvip; 175 unsigned long vsatp; 176 unsigned long scounteren; 177 unsigned long senvcfg; 178 }; 179 180 struct kvm_vcpu_config { 181 u64 henvcfg; 182 u64 hstateen0; 183 unsigned long hedeleg; 184 }; 185 186 struct kvm_vcpu_smstateen_csr { 187 unsigned long sstateen0; 188 }; 189 190 struct kvm_vcpu_arch { 191 /* VCPU ran at least once */ 192 bool ran_atleast_once; 193 194 /* Last Host CPU on which Guest VCPU exited */ 195 int last_exit_cpu; 196 197 /* ISA feature bits (similar to MISA) */ 198 DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX); 199 200 /* Vendor, Arch, and Implementation details */ 201 unsigned long mvendorid; 202 unsigned long marchid; 203 unsigned long mimpid; 204 205 /* SSCRATCH, STVEC, and SCOUNTEREN of Host */ 206 unsigned long host_sscratch; 207 unsigned long host_stvec; 208 unsigned long host_scounteren; 209 unsigned long host_senvcfg; 210 unsigned long host_sstateen0; 211 212 /* CPU context of Host */ 213 struct kvm_cpu_context host_context; 214 215 /* CPU context of Guest VCPU */ 216 struct kvm_cpu_context guest_context; 217 218 /* CPU CSR context of Guest VCPU */ 219 struct kvm_vcpu_csr guest_csr; 220 221 /* CPU Smstateen CSR context of Guest VCPU */ 222 struct kvm_vcpu_smstateen_csr smstateen_csr; 223 224 /* CPU context upon Guest VCPU reset */ 225 struct kvm_cpu_context guest_reset_context; 226 spinlock_t reset_cntx_lock; 227 228 /* CPU CSR context upon Guest VCPU reset */ 229 struct kvm_vcpu_csr guest_reset_csr; 230 231 /* 232 * VCPU interrupts 233 * 234 * We have a lockless approach for tracking pending VCPU interrupts 235 * implemented using atomic bitops. The irqs_pending bitmap represent 236 * pending interrupts whereas irqs_pending_mask represent bits changed 237 * in irqs_pending. Our approach is modeled around multiple producer 238 * and single consumer problem where the consumer is the VCPU itself. 239 */ 240 #define KVM_RISCV_VCPU_NR_IRQS 64 241 DECLARE_BITMAP(irqs_pending, KVM_RISCV_VCPU_NR_IRQS); 242 DECLARE_BITMAP(irqs_pending_mask, KVM_RISCV_VCPU_NR_IRQS); 243 244 /* VCPU Timer */ 245 struct kvm_vcpu_timer timer; 246 247 /* HFENCE request queue */ 248 spinlock_t hfence_lock; 249 unsigned long hfence_head; 250 unsigned long hfence_tail; 251 struct kvm_riscv_hfence hfence_queue[KVM_RISCV_VCPU_MAX_HFENCE]; 252 253 /* MMIO instruction details */ 254 struct kvm_mmio_decode mmio_decode; 255 256 /* CSR instruction details */ 257 struct kvm_csr_decode csr_decode; 258 259 /* SBI context */ 260 struct kvm_vcpu_sbi_context sbi_context; 261 262 /* AIA VCPU context */ 263 struct kvm_vcpu_aia aia_context; 264 265 /* Cache pages needed to program page tables with spinlock held */ 266 struct kvm_mmu_memory_cache mmu_page_cache; 267 268 /* VCPU power state */ 269 struct kvm_mp_state mp_state; 270 spinlock_t mp_state_lock; 271 272 /* Don't run the VCPU (blocked) */ 273 bool pause; 274 275 /* Performance monitoring context */ 276 struct kvm_pmu pmu_context; 277 278 /* 'static' configurations which are set only once */ 279 struct kvm_vcpu_config cfg; 280 281 /* SBI steal-time accounting */ 282 struct { 283 gpa_t shmem; 284 u64 last_steal; 285 } sta; 286 }; 287 288 static inline void kvm_arch_sync_events(struct kvm *kvm) {} 289 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {} 290 291 #define KVM_RISCV_GSTAGE_TLB_MIN_ORDER 12 292 293 void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid, 294 gpa_t gpa, gpa_t gpsz, 295 unsigned long order); 296 void kvm_riscv_local_hfence_gvma_vmid_all(unsigned long vmid); 297 void kvm_riscv_local_hfence_gvma_gpa(gpa_t gpa, gpa_t gpsz, 298 unsigned long order); 299 void kvm_riscv_local_hfence_gvma_all(void); 300 void kvm_riscv_local_hfence_vvma_asid_gva(unsigned long vmid, 301 unsigned long asid, 302 unsigned long gva, 303 unsigned long gvsz, 304 unsigned long order); 305 void kvm_riscv_local_hfence_vvma_asid_all(unsigned long vmid, 306 unsigned long asid); 307 void kvm_riscv_local_hfence_vvma_gva(unsigned long vmid, 308 unsigned long gva, unsigned long gvsz, 309 unsigned long order); 310 void kvm_riscv_local_hfence_vvma_all(unsigned long vmid); 311 312 void kvm_riscv_local_tlb_sanitize(struct kvm_vcpu *vcpu); 313 314 void kvm_riscv_fence_i_process(struct kvm_vcpu *vcpu); 315 void kvm_riscv_hfence_gvma_vmid_all_process(struct kvm_vcpu *vcpu); 316 void kvm_riscv_hfence_vvma_all_process(struct kvm_vcpu *vcpu); 317 void kvm_riscv_hfence_process(struct kvm_vcpu *vcpu); 318 319 void kvm_riscv_fence_i(struct kvm *kvm, 320 unsigned long hbase, unsigned long hmask); 321 void kvm_riscv_hfence_gvma_vmid_gpa(struct kvm *kvm, 322 unsigned long hbase, unsigned long hmask, 323 gpa_t gpa, gpa_t gpsz, 324 unsigned long order); 325 void kvm_riscv_hfence_gvma_vmid_all(struct kvm *kvm, 326 unsigned long hbase, unsigned long hmask); 327 void kvm_riscv_hfence_vvma_asid_gva(struct kvm *kvm, 328 unsigned long hbase, unsigned long hmask, 329 unsigned long gva, unsigned long gvsz, 330 unsigned long order, unsigned long asid); 331 void kvm_riscv_hfence_vvma_asid_all(struct kvm *kvm, 332 unsigned long hbase, unsigned long hmask, 333 unsigned long asid); 334 void kvm_riscv_hfence_vvma_gva(struct kvm *kvm, 335 unsigned long hbase, unsigned long hmask, 336 unsigned long gva, unsigned long gvsz, 337 unsigned long order); 338 void kvm_riscv_hfence_vvma_all(struct kvm *kvm, 339 unsigned long hbase, unsigned long hmask); 340 341 int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa, 342 phys_addr_t hpa, unsigned long size, 343 bool writable, bool in_atomic); 344 void kvm_riscv_gstage_iounmap(struct kvm *kvm, gpa_t gpa, 345 unsigned long size); 346 int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu, 347 struct kvm_memory_slot *memslot, 348 gpa_t gpa, unsigned long hva, bool is_write); 349 int kvm_riscv_gstage_alloc_pgd(struct kvm *kvm); 350 void kvm_riscv_gstage_free_pgd(struct kvm *kvm); 351 void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu); 352 void __init kvm_riscv_gstage_mode_detect(void); 353 unsigned long __init kvm_riscv_gstage_mode(void); 354 int kvm_riscv_gstage_gpa_bits(void); 355 356 void __init kvm_riscv_gstage_vmid_detect(void); 357 unsigned long kvm_riscv_gstage_vmid_bits(void); 358 int kvm_riscv_gstage_vmid_init(struct kvm *kvm); 359 bool kvm_riscv_gstage_vmid_ver_changed(struct kvm_vmid *vmid); 360 void kvm_riscv_gstage_vmid_update(struct kvm_vcpu *vcpu); 361 362 int kvm_riscv_setup_default_irq_routing(struct kvm *kvm, u32 lines); 363 364 void __kvm_riscv_unpriv_trap(void); 365 366 unsigned long kvm_riscv_vcpu_unpriv_read(struct kvm_vcpu *vcpu, 367 bool read_insn, 368 unsigned long guest_addr, 369 struct kvm_cpu_trap *trap); 370 void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu, 371 struct kvm_cpu_trap *trap); 372 int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, 373 struct kvm_cpu_trap *trap); 374 375 void __kvm_riscv_switch_to(struct kvm_vcpu_arch *vcpu_arch); 376 377 void kvm_riscv_vcpu_setup_isa(struct kvm_vcpu *vcpu); 378 unsigned long kvm_riscv_vcpu_num_regs(struct kvm_vcpu *vcpu); 379 int kvm_riscv_vcpu_copy_reg_indices(struct kvm_vcpu *vcpu, 380 u64 __user *uindices); 381 int kvm_riscv_vcpu_get_reg(struct kvm_vcpu *vcpu, 382 const struct kvm_one_reg *reg); 383 int kvm_riscv_vcpu_set_reg(struct kvm_vcpu *vcpu, 384 const struct kvm_one_reg *reg); 385 386 int kvm_riscv_vcpu_set_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); 387 int kvm_riscv_vcpu_unset_interrupt(struct kvm_vcpu *vcpu, unsigned int irq); 388 void kvm_riscv_vcpu_flush_interrupts(struct kvm_vcpu *vcpu); 389 void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu); 390 bool kvm_riscv_vcpu_has_interrupts(struct kvm_vcpu *vcpu, u64 mask); 391 void __kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu); 392 void kvm_riscv_vcpu_power_off(struct kvm_vcpu *vcpu); 393 void __kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); 394 void kvm_riscv_vcpu_power_on(struct kvm_vcpu *vcpu); 395 bool kvm_riscv_vcpu_stopped(struct kvm_vcpu *vcpu); 396 397 void kvm_riscv_vcpu_sbi_sta_reset(struct kvm_vcpu *vcpu); 398 void kvm_riscv_vcpu_record_steal_time(struct kvm_vcpu *vcpu); 399 400 #endif /* __RISCV_KVM_HOST_H__ */ 401