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