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