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