arch/arm/include/asm/kvm_host.h

   1 /*
   2  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #ifndef __ARM_KVM_HOST_H__
  20 #define __ARM_KVM_HOST_H__
  21
  22 #include <linux/errno.h>
  23 #include <linux/types.h>
  24 #include <linux/kvm_types.h>
  25 #include <asm/cputype.h>
  26 #include <asm/kvm.h>
  27 #include <asm/kvm_asm.h>
  28 #include <asm/kvm_mmio.h>
  29 #include <asm/fpstate.h>
  30 #include <asm/smp_plat.h>
  31 #include <kvm/arm_arch_timer.h>
  32
  33 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  34
  35 #define KVM_USER_MEM_SLOTS 32
  36 #define KVM_HAVE_ONE_REG
  37 #define KVM_HALT_POLL_NS_DEFAULT 500000
  38
  39 #define KVM_VCPU_MAX_FEATURES 2
  40
  41 #include <kvm/arm_vgic.h>
  42
  43
  44 #ifdef CONFIG_ARM_GIC_V3
  45 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
  46 #else
  47 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
  48 #endif
  49
  50 #define KVM_REQ_SLEEP \
  51         KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
  52 #define KVM_REQ_IRQ_PENDING     KVM_ARCH_REQ(1)
  53 #define KVM_REQ_VCPU_RESET      KVM_ARCH_REQ(2)
  54
  55 DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
  56
  57 static inline int kvm_arm_init_sve(void) { return 0; }
  58
  59 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  60 int __attribute_const__ kvm_target_cpu(void);
  61 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  62 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  63
  64 struct kvm_vmid {
  65         /* The VMID generation used for the virt. memory system */
  66         u64    vmid_gen;
  67         u32    vmid;
  68 };
  69
  70 struct kvm_arch {
  71         /* The last vcpu id that ran on each physical CPU */
  72         int __percpu *last_vcpu_ran;
  73
  74         /*
  75          * Anything that is not used directly from assembly code goes
  76          * here.
  77          */
  78
  79         /* The VMID generation used for the virt. memory system */
  80         struct kvm_vmid vmid;
  81
  82         /* Stage-2 page table */
  83         pgd_t *pgd;
  84         phys_addr_t pgd_phys;
  85
  86         /* Interrupt controller */
  87         struct vgic_dist        vgic;
  88         int max_vcpus;
  89
  90         /* Mandated version of PSCI */
  91         u32 psci_version;
  92 };
  93
  94 #define KVM_NR_MEM_OBJS     40
  95
  96 /*
  97  * We don't want allocation failures within the mmu code, so we preallocate
  98  * enough memory for a single page fault in a cache.
  99  */
 100 struct kvm_mmu_memory_cache {
 101         int nobjs;
 102         void *objects[KVM_NR_MEM_OBJS];
 103 };
 104
 105 struct kvm_vcpu_fault_info {
 106         u32 hsr;                /* Hyp Syndrome Register */
 107         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
 108         u32 hpfar;              /* Hyp IPA Fault Address Register */
 109 };
 110
 111 /*
 112  * 0 is reserved as an invalid value.
 113  * Order should be kept in sync with the save/restore code.
 114  */
 115 enum vcpu_sysreg {
 116         __INVALID_SYSREG__,
 117         c0_MPIDR,               /* MultiProcessor ID Register */
 118         c0_CSSELR,              /* Cache Size Selection Register */
 119         c1_SCTLR,               /* System Control Register */
 120         c1_ACTLR,               /* Auxiliary Control Register */
 121         c1_CPACR,               /* Coprocessor Access Control */
 122         c2_TTBR0,               /* Translation Table Base Register 0 */
 123         c2_TTBR0_high,          /* TTBR0 top 32 bits */
 124         c2_TTBR1,               /* Translation Table Base Register 1 */
 125         c2_TTBR1_high,          /* TTBR1 top 32 bits */
 126         c2_TTBCR,               /* Translation Table Base Control R. */
 127         c3_DACR,                /* Domain Access Control Register */
 128         c5_DFSR,                /* Data Fault Status Register */
 129         c5_IFSR,                /* Instruction Fault Status Register */
 130         c5_ADFSR,               /* Auxilary Data Fault Status R */
 131         c5_AIFSR,               /* Auxilary Instrunction Fault Status R */
 132         c6_DFAR,                /* Data Fault Address Register */
 133         c6_IFAR,                /* Instruction Fault Address Register */
 134         c7_PAR,                 /* Physical Address Register */
 135         c7_PAR_high,            /* PAR top 32 bits */
 136         c9_L2CTLR,              /* Cortex A15/A7 L2 Control Register */
 137         c10_PRRR,               /* Primary Region Remap Register */
 138         c10_NMRR,               /* Normal Memory Remap Register */
 139         c12_VBAR,               /* Vector Base Address Register */
 140         c13_CID,                /* Context ID Register */
 141         c13_TID_URW,            /* Thread ID, User R/W */
 142         c13_TID_URO,            /* Thread ID, User R/O */
 143         c13_TID_PRIV,           /* Thread ID, Privileged */
 144         c14_CNTKCTL,            /* Timer Control Register (PL1) */
 145         c10_AMAIR0,             /* Auxilary Memory Attribute Indirection Reg0 */
 146         c10_AMAIR1,             /* Auxilary Memory Attribute Indirection Reg1 */
 147         NR_CP15_REGS            /* Number of regs (incl. invalid) */
 148 };
 149
 150 struct kvm_cpu_context {
 151         struct kvm_regs gp_regs;
 152         struct vfp_hard_struct vfp;
 153         u32 cp15[NR_CP15_REGS];
 154 };
 155
 156 struct kvm_host_data {
 157         struct kvm_cpu_context host_ctxt;
 158 };
 159
 160 typedef struct kvm_host_data kvm_host_data_t;
 161
 162 static inline void kvm_init_host_cpu_context(struct kvm_cpu_context *cpu_ctxt,
 163                                              int cpu)
 164 {
 165         /* The host's MPIDR is immutable, so let's set it up at boot time */
 166         cpu_ctxt->cp15[c0_MPIDR] = cpu_logical_map(cpu);
 167 }
 168
 169 struct vcpu_reset_state {
 170         unsigned long   pc;
 171         unsigned long   r0;
 172         bool            be;
 173         bool            reset;
 174 };
 175
 176 struct kvm_vcpu_arch {
 177         struct kvm_cpu_context ctxt;
 178
 179         int target; /* Processor target */
 180         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 181
 182         /* The CPU type we expose to the VM */
 183         u32 midr;
 184
 185         /* HYP trapping configuration */
 186         u32 hcr;
 187
 188         /* Exception Information */
 189         struct kvm_vcpu_fault_info fault;
 190
 191         /* Host FP context */
 192         struct kvm_cpu_context *host_cpu_context;
 193
 194         /* VGIC state */
 195         struct vgic_cpu vgic_cpu;
 196         struct arch_timer_cpu timer_cpu;
 197
 198         /*
 199          * Anything that is not used directly from assembly code goes
 200          * here.
 201          */
 202
 203         /* vcpu power-off state */
 204         bool power_off;
 205
 206          /* Don't run the guest (internal implementation need) */
 207         bool pause;
 208
 209         /* IO related fields */
 210         struct kvm_decode mmio_decode;
 211
 212         /* Cache some mmu pages needed inside spinlock regions */
 213         struct kvm_mmu_memory_cache mmu_page_cache;
 214
 215         struct vcpu_reset_state reset_state;
 216
 217         /* Detect first run of a vcpu */
 218         bool has_run_once;
 219 };
 220
 221 struct kvm_vm_stat {
 222         ulong remote_tlb_flush;
 223 };
 224
 225 struct kvm_vcpu_stat {
 226         u64 halt_successful_poll;
 227         u64 halt_attempted_poll;
 228         u64 halt_poll_invalid;
 229         u64 halt_wakeup;
 230         u64 hvc_exit_stat;
 231         u64 wfe_exit_stat;
 232         u64 wfi_exit_stat;
 233         u64 mmio_exit_user;
 234         u64 mmio_exit_kernel;
 235         u64 exits;
 236 };
 237
 238 #define vcpu_cp15(v,r)  (v)->arch.ctxt.cp15[r]
 239
 240 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 241 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 242 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 243 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 244 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 245
 246 unsigned long __kvm_call_hyp(void *hypfn, ...);
 247
 248 /*
 249  * The has_vhe() part doesn't get emitted, but is used for type-checking.
 250  */
 251 #define kvm_call_hyp(f, ...)                                            \
 252         do {                                                            \
 253                 if (has_vhe()) {                                        \
 254                         f(__VA_ARGS__);                                 \
 255                 } else {                                                \
 256                         __kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__); \
 257                 }                                                       \
 258         } while(0)
 259
 260 #define kvm_call_hyp_ret(f, ...)                                        \
 261         ({                                                              \
 262                 typeof(f(__VA_ARGS__)) ret;                             \
 263                                                                         \
 264                 if (has_vhe()) {                                        \
 265                         ret = f(__VA_ARGS__);                           \
 266                 } else {                                                \
 267                         ret = __kvm_call_hyp(kvm_ksym_ref(f),           \
 268                                              ##__VA_ARGS__);            \
 269                 }                                                       \
 270                                                                         \
 271                 ret;                                                    \
 272         })
 273
 274 void force_vm_exit(const cpumask_t *mask);
 275 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
 276                               struct kvm_vcpu_events *events);
 277
 278 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 279                               struct kvm_vcpu_events *events);
 280
 281 #define KVM_ARCH_WANT_MMU_NOTIFIER
 282 int kvm_unmap_hva_range(struct kvm *kvm,
 283                         unsigned long start, unsigned long end);
 284 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 285
 286 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 287 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 288 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 289 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 290
 291 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 292 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 293 void kvm_arm_halt_guest(struct kvm *kvm);
 294 void kvm_arm_resume_guest(struct kvm *kvm);
 295
 296 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 297 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 298 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 299 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 300
 301 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 302                 int exception_index);
 303
 304 static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
 305                                      int exception_index) {}
 306
 307 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
 308                                        unsigned long hyp_stack_ptr,
 309                                        unsigned long vector_ptr)
 310 {
 311         /*
 312          * Call initialization code, and switch to the full blown HYP
 313          * code. The init code doesn't need to preserve these
 314          * registers as r0-r3 are already callee saved according to
 315          * the AAPCS.
 316          * Note that we slightly misuse the prototype by casting the
 317          * stack pointer to a void *.
 318
 319          * The PGDs are always passed as the third argument, in order
 320          * to be passed into r2-r3 to the init code (yes, this is
 321          * compliant with the PCS!).
 322          */
 323
 324         __kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 325 }
 326
 327 static inline void __cpu_init_stage2(void)
 328 {
 329         kvm_call_hyp(__init_stage2_translation);
 330 }
 331
 332 static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 333 {
 334         return 0;
 335 }
 336
 337 int kvm_perf_init(void);
 338 int kvm_perf_teardown(void);
 339
 340 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 341
 342 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 343
 344 static inline bool kvm_arch_requires_vhe(void) { return false; }
 345 static inline void kvm_arch_hardware_unsetup(void) {}
 346 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 347 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 348 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 349 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 350
 351 static inline void kvm_arm_init_debug(void) {}
 352 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 353 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 354 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 355
 356 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 357                                struct kvm_device_attr *attr);
 358 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 359                                struct kvm_device_attr *attr);
 360 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 361                                struct kvm_device_attr *attr);
 362
 363 /*
 364  * VFP/NEON switching is all done by the hyp switch code, so no need to
 365  * coordinate with host context handling for this state:
 366  */
 367 static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {}
 368 static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {}
 369 static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {}
 370
 371 static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
 372 static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}
 373
 374 static inline void kvm_arm_vhe_guest_enter(void) {}
 375 static inline void kvm_arm_vhe_guest_exit(void) {}
 376
 377 static inline bool kvm_arm_harden_branch_predictor(void)
 378 {
 379         switch(read_cpuid_part()) {
 380 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
 381         case ARM_CPU_PART_BRAHMA_B15:
 382         case ARM_CPU_PART_CORTEX_A12:
 383         case ARM_CPU_PART_CORTEX_A15:
 384         case ARM_CPU_PART_CORTEX_A17:
 385                 return true;
 386 #endif
 387         default:
 388                 return false;
 389         }
 390 }
 391
 392 #define KVM_SSBD_UNKNOWN                -1
 393 #define KVM_SSBD_FORCE_DISABLE          0
 394 #define KVM_SSBD_KERNEL         1
 395 #define KVM_SSBD_FORCE_ENABLE           2
 396 #define KVM_SSBD_MITIGATED              3
 397
 398 static inline int kvm_arm_have_ssbd(void)
 399 {
 400         /* No way to detect it yet, pretend it is not there. */
 401         return KVM_SSBD_UNKNOWN;
 402 }
 403
 404 static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
 405 static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}
 406
 407 #define __KVM_HAVE_ARCH_VM_ALLOC
 408 struct kvm *kvm_arch_alloc_vm(void);
 409 void kvm_arch_free_vm(struct kvm *kvm);
 410
 411 static inline int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 412 {
 413         /*
 414          * On 32bit ARM, VMs get a static 40bit IPA stage2 setup,
 415          * so any non-zero value used as type is illegal.
 416          */
 417         if (type)
 418                 return -EINVAL;
 419         return 0;
 420 }
 421
 422 static inline int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature)
 423 {
 424         return -EINVAL;
 425 }
 426
 427 static inline bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
 428 {
 429         return true;
 430 }
 431
 432 #endif /* __ARM_KVM_HOST_H__ */