1 /* 2 * Copyright (C) 2012,2013 - ARM Ltd 3 * Author: Marc Zyngier <marc.zyngier@arm.com> 4 * 5 * Derived from arch/arm/include/asm/kvm_host.h: 6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University 7 * Author: Christoffer Dall <c.dall@virtualopensystems.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program. If not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #ifndef __ARM64_KVM_HOST_H__ 23 #define __ARM64_KVM_HOST_H__ 24 25 #include <linux/types.h> 26 #include <linux/kvm_types.h> 27 #include <asm/cpufeature.h> 28 #include <asm/daifflags.h> 29 #include <asm/fpsimd.h> 30 #include <asm/kvm.h> 31 #include <asm/kvm_asm.h> 32 #include <asm/kvm_mmio.h> 33 34 #define __KVM_HAVE_ARCH_INTC_INITIALIZED 35 36 #define KVM_USER_MEM_SLOTS 512 37 #define KVM_HALT_POLL_NS_DEFAULT 500000 38 39 #include <kvm/arm_vgic.h> 40 #include <kvm/arm_arch_timer.h> 41 #include <kvm/arm_pmu.h> 42 43 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS 44 45 #define KVM_VCPU_MAX_FEATURES 4 46 47 #define KVM_REQ_SLEEP \ 48 KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP) 49 #define KVM_REQ_IRQ_PENDING KVM_ARCH_REQ(1) 50 51 DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use); 52 53 int __attribute_const__ kvm_target_cpu(void); 54 int kvm_reset_vcpu(struct kvm_vcpu *vcpu); 55 int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext); 56 void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start); 57 58 struct kvm_arch { 59 /* The VMID generation used for the virt. memory system */ 60 u64 vmid_gen; 61 u32 vmid; 62 63 /* 1-level 2nd stage table and lock */ 64 spinlock_t pgd_lock; 65 pgd_t *pgd; 66 67 /* VTTBR value associated with above pgd and vmid */ 68 u64 vttbr; 69 70 /* The last vcpu id that ran on each physical CPU */ 71 int __percpu *last_vcpu_ran; 72 73 /* The maximum number of vCPUs depends on the used GIC model */ 74 int max_vcpus; 75 76 /* Interrupt controller */ 77 struct vgic_dist vgic; 78 }; 79 80 #define KVM_NR_MEM_OBJS 40 81 82 /* 83 * We don't want allocation failures within the mmu code, so we preallocate 84 * enough memory for a single page fault in a cache. 85 */ 86 struct kvm_mmu_memory_cache { 87 int nobjs; 88 void *objects[KVM_NR_MEM_OBJS]; 89 }; 90 91 struct kvm_vcpu_fault_info { 92 u32 esr_el2; /* Hyp Syndrom Register */ 93 u64 far_el2; /* Hyp Fault Address Register */ 94 u64 hpfar_el2; /* Hyp IPA Fault Address Register */ 95 u64 disr_el1; /* Deferred [SError] Status Register */ 96 }; 97 98 /* 99 * 0 is reserved as an invalid value. 100 * Order should be kept in sync with the save/restore code. 101 */ 102 enum vcpu_sysreg { 103 __INVALID_SYSREG__, 104 MPIDR_EL1, /* MultiProcessor Affinity Register */ 105 CSSELR_EL1, /* Cache Size Selection Register */ 106 SCTLR_EL1, /* System Control Register */ 107 ACTLR_EL1, /* Auxiliary Control Register */ 108 CPACR_EL1, /* Coprocessor Access Control */ 109 TTBR0_EL1, /* Translation Table Base Register 0 */ 110 TTBR1_EL1, /* Translation Table Base Register 1 */ 111 TCR_EL1, /* Translation Control Register */ 112 ESR_EL1, /* Exception Syndrome Register */ 113 AFSR0_EL1, /* Auxiliary Fault Status Register 0 */ 114 AFSR1_EL1, /* Auxiliary Fault Status Register 1 */ 115 FAR_EL1, /* Fault Address Register */ 116 MAIR_EL1, /* Memory Attribute Indirection Register */ 117 VBAR_EL1, /* Vector Base Address Register */ 118 CONTEXTIDR_EL1, /* Context ID Register */ 119 TPIDR_EL0, /* Thread ID, User R/W */ 120 TPIDRRO_EL0, /* Thread ID, User R/O */ 121 TPIDR_EL1, /* Thread ID, Privileged */ 122 AMAIR_EL1, /* Aux Memory Attribute Indirection Register */ 123 CNTKCTL_EL1, /* Timer Control Register (EL1) */ 124 PAR_EL1, /* Physical Address Register */ 125 MDSCR_EL1, /* Monitor Debug System Control Register */ 126 MDCCINT_EL1, /* Monitor Debug Comms Channel Interrupt Enable Reg */ 127 DISR_EL1, /* Deferred Interrupt Status Register */ 128 129 /* Performance Monitors Registers */ 130 PMCR_EL0, /* Control Register */ 131 PMSELR_EL0, /* Event Counter Selection Register */ 132 PMEVCNTR0_EL0, /* Event Counter Register (0-30) */ 133 PMEVCNTR30_EL0 = PMEVCNTR0_EL0 + 30, 134 PMCCNTR_EL0, /* Cycle Counter Register */ 135 PMEVTYPER0_EL0, /* Event Type Register (0-30) */ 136 PMEVTYPER30_EL0 = PMEVTYPER0_EL0 + 30, 137 PMCCFILTR_EL0, /* Cycle Count Filter Register */ 138 PMCNTENSET_EL0, /* Count Enable Set Register */ 139 PMINTENSET_EL1, /* Interrupt Enable Set Register */ 140 PMOVSSET_EL0, /* Overflow Flag Status Set Register */ 141 PMSWINC_EL0, /* Software Increment Register */ 142 PMUSERENR_EL0, /* User Enable Register */ 143 144 /* 32bit specific registers. Keep them at the end of the range */ 145 DACR32_EL2, /* Domain Access Control Register */ 146 IFSR32_EL2, /* Instruction Fault Status Register */ 147 FPEXC32_EL2, /* Floating-Point Exception Control Register */ 148 DBGVCR32_EL2, /* Debug Vector Catch Register */ 149 150 NR_SYS_REGS /* Nothing after this line! */ 151 }; 152 153 /* 32bit mapping */ 154 #define c0_MPIDR (MPIDR_EL1 * 2) /* MultiProcessor ID Register */ 155 #define c0_CSSELR (CSSELR_EL1 * 2)/* Cache Size Selection Register */ 156 #define c1_SCTLR (SCTLR_EL1 * 2) /* System Control Register */ 157 #define c1_ACTLR (ACTLR_EL1 * 2) /* Auxiliary Control Register */ 158 #define c1_CPACR (CPACR_EL1 * 2) /* Coprocessor Access Control */ 159 #define c2_TTBR0 (TTBR0_EL1 * 2) /* Translation Table Base Register 0 */ 160 #define c2_TTBR0_high (c2_TTBR0 + 1) /* TTBR0 top 32 bits */ 161 #define c2_TTBR1 (TTBR1_EL1 * 2) /* Translation Table Base Register 1 */ 162 #define c2_TTBR1_high (c2_TTBR1 + 1) /* TTBR1 top 32 bits */ 163 #define c2_TTBCR (TCR_EL1 * 2) /* Translation Table Base Control R. */ 164 #define c3_DACR (DACR32_EL2 * 2)/* Domain Access Control Register */ 165 #define c5_DFSR (ESR_EL1 * 2) /* Data Fault Status Register */ 166 #define c5_IFSR (IFSR32_EL2 * 2)/* Instruction Fault Status Register */ 167 #define c5_ADFSR (AFSR0_EL1 * 2) /* Auxiliary Data Fault Status R */ 168 #define c5_AIFSR (AFSR1_EL1 * 2) /* Auxiliary Instr Fault Status R */ 169 #define c6_DFAR (FAR_EL1 * 2) /* Data Fault Address Register */ 170 #define c6_IFAR (c6_DFAR + 1) /* Instruction Fault Address Register */ 171 #define c7_PAR (PAR_EL1 * 2) /* Physical Address Register */ 172 #define c7_PAR_high (c7_PAR + 1) /* PAR top 32 bits */ 173 #define c10_PRRR (MAIR_EL1 * 2) /* Primary Region Remap Register */ 174 #define c10_NMRR (c10_PRRR + 1) /* Normal Memory Remap Register */ 175 #define c12_VBAR (VBAR_EL1 * 2) /* Vector Base Address Register */ 176 #define c13_CID (CONTEXTIDR_EL1 * 2) /* Context ID Register */ 177 #define c13_TID_URW (TPIDR_EL0 * 2) /* Thread ID, User R/W */ 178 #define c13_TID_URO (TPIDRRO_EL0 * 2)/* Thread ID, User R/O */ 179 #define c13_TID_PRIV (TPIDR_EL1 * 2) /* Thread ID, Privileged */ 180 #define c10_AMAIR0 (AMAIR_EL1 * 2) /* Aux Memory Attr Indirection Reg */ 181 #define c10_AMAIR1 (c10_AMAIR0 + 1)/* Aux Memory Attr Indirection Reg */ 182 #define c14_CNTKCTL (CNTKCTL_EL1 * 2) /* Timer Control Register (PL1) */ 183 184 #define cp14_DBGDSCRext (MDSCR_EL1 * 2) 185 #define cp14_DBGBCR0 (DBGBCR0_EL1 * 2) 186 #define cp14_DBGBVR0 (DBGBVR0_EL1 * 2) 187 #define cp14_DBGBXVR0 (cp14_DBGBVR0 + 1) 188 #define cp14_DBGWCR0 (DBGWCR0_EL1 * 2) 189 #define cp14_DBGWVR0 (DBGWVR0_EL1 * 2) 190 #define cp14_DBGDCCINT (MDCCINT_EL1 * 2) 191 192 #define NR_COPRO_REGS (NR_SYS_REGS * 2) 193 194 struct kvm_cpu_context { 195 struct kvm_regs gp_regs; 196 union { 197 u64 sys_regs[NR_SYS_REGS]; 198 u32 copro[NR_COPRO_REGS]; 199 }; 200 201 struct kvm_vcpu *__hyp_running_vcpu; 202 }; 203 204 typedef struct kvm_cpu_context kvm_cpu_context_t; 205 206 struct kvm_vcpu_arch { 207 struct kvm_cpu_context ctxt; 208 209 /* HYP configuration */ 210 u64 hcr_el2; 211 u32 mdcr_el2; 212 213 /* Exception Information */ 214 struct kvm_vcpu_fault_info fault; 215 216 /* Guest debug state */ 217 u64 debug_flags; 218 219 /* 220 * We maintain more than a single set of debug registers to support 221 * debugging the guest from the host and to maintain separate host and 222 * guest state during world switches. vcpu_debug_state are the debug 223 * registers of the vcpu as the guest sees them. host_debug_state are 224 * the host registers which are saved and restored during 225 * world switches. external_debug_state contains the debug 226 * values we want to debug the guest. This is set via the 227 * KVM_SET_GUEST_DEBUG ioctl. 228 * 229 * debug_ptr points to the set of debug registers that should be loaded 230 * onto the hardware when running the guest. 231 */ 232 struct kvm_guest_debug_arch *debug_ptr; 233 struct kvm_guest_debug_arch vcpu_debug_state; 234 struct kvm_guest_debug_arch external_debug_state; 235 236 /* Pointer to host CPU context */ 237 kvm_cpu_context_t *host_cpu_context; 238 struct { 239 /* {Break,watch}point registers */ 240 struct kvm_guest_debug_arch regs; 241 /* Statistical profiling extension */ 242 u64 pmscr_el1; 243 } host_debug_state; 244 245 /* VGIC state */ 246 struct vgic_cpu vgic_cpu; 247 struct arch_timer_cpu timer_cpu; 248 struct kvm_pmu pmu; 249 250 /* 251 * Anything that is not used directly from assembly code goes 252 * here. 253 */ 254 255 /* 256 * Guest registers we preserve during guest debugging. 257 * 258 * These shadow registers are updated by the kvm_handle_sys_reg 259 * trap handler if the guest accesses or updates them while we 260 * are using guest debug. 261 */ 262 struct { 263 u32 mdscr_el1; 264 } guest_debug_preserved; 265 266 /* vcpu power-off state */ 267 bool power_off; 268 269 /* Don't run the guest (internal implementation need) */ 270 bool pause; 271 272 /* IO related fields */ 273 struct kvm_decode mmio_decode; 274 275 /* Cache some mmu pages needed inside spinlock regions */ 276 struct kvm_mmu_memory_cache mmu_page_cache; 277 278 /* Target CPU and feature flags */ 279 int target; 280 DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES); 281 282 /* Detect first run of a vcpu */ 283 bool has_run_once; 284 285 /* Virtual SError ESR to restore when HCR_EL2.VSE is set */ 286 u64 vsesr_el2; 287 288 /* True when deferrable sysregs are loaded on the physical CPU, 289 * see kvm_vcpu_load_sysregs and kvm_vcpu_put_sysregs. */ 290 bool sysregs_loaded_on_cpu; 291 }; 292 293 #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs) 294 295 /* 296 * Only use __vcpu_sys_reg if you know you want the memory backed version of a 297 * register, and not the one most recently accessed by a running VCPU. For 298 * example, for userspace access or for system registers that are never context 299 * switched, but only emulated. 300 */ 301 #define __vcpu_sys_reg(v,r) ((v)->arch.ctxt.sys_regs[(r)]) 302 303 u64 vcpu_read_sys_reg(struct kvm_vcpu *vcpu, int reg); 304 void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg); 305 306 /* 307 * CP14 and CP15 live in the same array, as they are backed by the 308 * same system registers. 309 */ 310 #define vcpu_cp14(v,r) ((v)->arch.ctxt.copro[(r)]) 311 #define vcpu_cp15(v,r) ((v)->arch.ctxt.copro[(r)]) 312 313 struct kvm_vm_stat { 314 ulong remote_tlb_flush; 315 }; 316 317 struct kvm_vcpu_stat { 318 u64 halt_successful_poll; 319 u64 halt_attempted_poll; 320 u64 halt_poll_invalid; 321 u64 halt_wakeup; 322 u64 hvc_exit_stat; 323 u64 wfe_exit_stat; 324 u64 wfi_exit_stat; 325 u64 mmio_exit_user; 326 u64 mmio_exit_kernel; 327 u64 exits; 328 }; 329 330 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init); 331 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu); 332 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices); 333 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg); 334 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg); 335 336 #define KVM_ARCH_WANT_MMU_NOTIFIER 337 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva); 338 int kvm_unmap_hva_range(struct kvm *kvm, 339 unsigned long start, unsigned long end); 340 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte); 341 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end); 342 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva); 343 344 struct kvm_vcpu *kvm_arm_get_running_vcpu(void); 345 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void); 346 void kvm_arm_halt_guest(struct kvm *kvm); 347 void kvm_arm_resume_guest(struct kvm *kvm); 348 349 u64 __kvm_call_hyp(void *hypfn, ...); 350 #define kvm_call_hyp(f, ...) __kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__) 351 352 void force_vm_exit(const cpumask_t *mask); 353 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot); 354 355 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, 356 int exception_index); 357 void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run, 358 int exception_index); 359 360 int kvm_perf_init(void); 361 int kvm_perf_teardown(void); 362 363 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr); 364 365 void __kvm_set_tpidr_el2(u64 tpidr_el2); 366 DECLARE_PER_CPU(kvm_cpu_context_t, kvm_host_cpu_state); 367 368 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr, 369 unsigned long hyp_stack_ptr, 370 unsigned long vector_ptr) 371 { 372 u64 tpidr_el2; 373 374 /* 375 * Call initialization code, and switch to the full blown HYP code. 376 * If the cpucaps haven't been finalized yet, something has gone very 377 * wrong, and hyp will crash and burn when it uses any 378 * cpus_have_const_cap() wrapper. 379 */ 380 BUG_ON(!static_branch_likely(&arm64_const_caps_ready)); 381 __kvm_call_hyp((void *)pgd_ptr, hyp_stack_ptr, vector_ptr); 382 383 /* 384 * Calculate the raw per-cpu offset without a translation from the 385 * kernel's mapping to the linear mapping, and store it in tpidr_el2 386 * so that we can use adr_l to access per-cpu variables in EL2. 387 */ 388 tpidr_el2 = (u64)this_cpu_ptr(&kvm_host_cpu_state) 389 - (u64)kvm_ksym_ref(kvm_host_cpu_state); 390 391 kvm_call_hyp(__kvm_set_tpidr_el2, tpidr_el2); 392 } 393 394 static inline void kvm_arch_hardware_unsetup(void) {} 395 static inline void kvm_arch_sync_events(struct kvm *kvm) {} 396 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {} 397 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {} 398 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {} 399 400 void kvm_arm_init_debug(void); 401 void kvm_arm_setup_debug(struct kvm_vcpu *vcpu); 402 void kvm_arm_clear_debug(struct kvm_vcpu *vcpu); 403 void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu); 404 bool kvm_arm_handle_step_debug(struct kvm_vcpu *vcpu, struct kvm_run *run); 405 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu, 406 struct kvm_device_attr *attr); 407 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu, 408 struct kvm_device_attr *attr); 409 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu, 410 struct kvm_device_attr *attr); 411 412 static inline void __cpu_init_stage2(void) 413 { 414 u32 parange = kvm_call_hyp(__init_stage2_translation); 415 416 WARN_ONCE(parange < 40, 417 "PARange is %d bits, unsupported configuration!", parange); 418 } 419 420 /* 421 * All host FP/SIMD state is restored on guest exit, so nothing needs 422 * doing here except in the SVE case: 423 */ 424 static inline void kvm_fpsimd_flush_cpu_state(void) 425 { 426 if (system_supports_sve()) 427 sve_flush_cpu_state(); 428 } 429 430 static inline void kvm_arm_vhe_guest_enter(void) 431 { 432 local_daif_mask(); 433 } 434 435 static inline void kvm_arm_vhe_guest_exit(void) 436 { 437 local_daif_restore(DAIF_PROCCTX_NOIRQ); 438 439 /* 440 * When we exit from the guest we change a number of CPU configuration 441 * parameters, such as traps. Make sure these changes take effect 442 * before running the host or additional guests. 443 */ 444 isb(); 445 } 446 447 static inline bool kvm_arm_harden_branch_predictor(void) 448 { 449 return cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR); 450 } 451 452 void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu); 453 void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu); 454 455 #endif /* __ARM64_KVM_HOST_H__ */ 456