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/kvm.h>
  25 #include <asm/kvm_asm.h>
  26 #include <asm/kvm_mmio.h>
  27 #include <asm/fpstate.h>
  28 #include <kvm/arm_arch_timer.h>
  29
  30 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  31
  32 #define KVM_USER_MEM_SLOTS 32
  33 #define KVM_HAVE_ONE_REG
  34 #define KVM_HALT_POLL_NS_DEFAULT 500000
  35
  36 #define KVM_VCPU_MAX_FEATURES 2
  37
  38 #include <kvm/arm_vgic.h>
  39
  40
  41 #ifdef CONFIG_ARM_GIC_V3
  42 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
  43 #else
  44 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
  45 #endif
  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 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  54 int __attribute_const__ kvm_target_cpu(void);
  55 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  56 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  57
  58 struct kvm_arch {
  59         /* VTTBR value associated with below pgd and vmid */
  60         u64    vttbr;
  61
  62         /* The last vcpu id that ran on each physical CPU */
  63         int __percpu *last_vcpu_ran;
  64
  65         /*
  66          * Anything that is not used directly from assembly code goes
  67          * here.
  68          */
  69
  70         /* The VMID generation used for the virt. memory system */
  71         u64    vmid_gen;
  72         u32    vmid;
  73
  74         /* Stage-2 page table */
  75         pgd_t *pgd;
  76
  77         /* Interrupt controller */
  78         struct vgic_dist        vgic;
  79         int max_vcpus;
  80 };
  81
  82 #define KVM_NR_MEM_OBJS     40
  83
  84 /*
  85  * We don't want allocation failures within the mmu code, so we preallocate
  86  * enough memory for a single page fault in a cache.
  87  */
  88 struct kvm_mmu_memory_cache {
  89         int nobjs;
  90         void *objects[KVM_NR_MEM_OBJS];
  91 };
  92
  93 struct kvm_vcpu_fault_info {
  94         u32 hsr;                /* Hyp Syndrome Register */
  95         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  96         u32 hpfar;              /* Hyp IPA Fault Address Register */
  97 };
  98
  99 /*
 100  * 0 is reserved as an invalid value.
 101  * Order should be kept in sync with the save/restore code.
 102  */
 103 enum vcpu_sysreg {
 104         __INVALID_SYSREG__,
 105         c0_MPIDR,               /* MultiProcessor ID Register */
 106         c0_CSSELR,              /* Cache Size Selection Register */
 107         c1_SCTLR,               /* System Control Register */
 108         c1_ACTLR,               /* Auxiliary Control Register */
 109         c1_CPACR,               /* Coprocessor Access Control */
 110         c2_TTBR0,               /* Translation Table Base Register 0 */
 111         c2_TTBR0_high,          /* TTBR0 top 32 bits */
 112         c2_TTBR1,               /* Translation Table Base Register 1 */
 113         c2_TTBR1_high,          /* TTBR1 top 32 bits */
 114         c2_TTBCR,               /* Translation Table Base Control R. */
 115         c3_DACR,                /* Domain Access Control Register */
 116         c5_DFSR,                /* Data Fault Status Register */
 117         c5_IFSR,                /* Instruction Fault Status Register */
 118         c5_ADFSR,               /* Auxilary Data Fault Status R */
 119         c5_AIFSR,               /* Auxilary Instrunction Fault Status R */
 120         c6_DFAR,                /* Data Fault Address Register */
 121         c6_IFAR,                /* Instruction Fault Address Register */
 122         c7_PAR,                 /* Physical Address Register */
 123         c7_PAR_high,            /* PAR top 32 bits */
 124         c9_L2CTLR,              /* Cortex A15/A7 L2 Control Register */
 125         c10_PRRR,               /* Primary Region Remap Register */
 126         c10_NMRR,               /* Normal Memory Remap Register */
 127         c12_VBAR,               /* Vector Base Address Register */
 128         c13_CID,                /* Context ID Register */
 129         c13_TID_URW,            /* Thread ID, User R/W */
 130         c13_TID_URO,            /* Thread ID, User R/O */
 131         c13_TID_PRIV,           /* Thread ID, Privileged */
 132         c14_CNTKCTL,            /* Timer Control Register (PL1) */
 133         c10_AMAIR0,             /* Auxilary Memory Attribute Indirection Reg0 */
 134         c10_AMAIR1,             /* Auxilary Memory Attribute Indirection Reg1 */
 135         NR_CP15_REGS            /* Number of regs (incl. invalid) */
 136 };
 137
 138 struct kvm_cpu_context {
 139         struct kvm_regs gp_regs;
 140         struct vfp_hard_struct vfp;
 141         u32 cp15[NR_CP15_REGS];
 142 };
 143
 144 typedef struct kvm_cpu_context kvm_cpu_context_t;
 145
 146 struct kvm_vcpu_arch {
 147         struct kvm_cpu_context ctxt;
 148
 149         int target; /* Processor target */
 150         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 151
 152         /* The CPU type we expose to the VM */
 153         u32 midr;
 154
 155         /* HYP trapping configuration */
 156         u32 hcr;
 157
 158         /* Interrupt related fields */
 159         u32 irq_lines;          /* IRQ and FIQ levels */
 160
 161         /* Exception Information */
 162         struct kvm_vcpu_fault_info fault;
 163
 164         /* Host FP context */
 165         kvm_cpu_context_t *host_cpu_context;
 166
 167         /* VGIC state */
 168         struct vgic_cpu vgic_cpu;
 169         struct arch_timer_cpu timer_cpu;
 170
 171         /*
 172          * Anything that is not used directly from assembly code goes
 173          * here.
 174          */
 175
 176         /* vcpu power-off state */
 177         bool power_off;
 178
 179          /* Don't run the guest (internal implementation need) */
 180         bool pause;
 181
 182         /* IO related fields */
 183         struct kvm_decode mmio_decode;
 184
 185         /* Cache some mmu pages needed inside spinlock regions */
 186         struct kvm_mmu_memory_cache mmu_page_cache;
 187
 188         /* Detect first run of a vcpu */
 189         bool has_run_once;
 190 };
 191
 192 struct kvm_vm_stat {
 193         ulong remote_tlb_flush;
 194 };
 195
 196 struct kvm_vcpu_stat {
 197         u64 halt_successful_poll;
 198         u64 halt_attempted_poll;
 199         u64 halt_poll_invalid;
 200         u64 halt_wakeup;
 201         u64 hvc_exit_stat;
 202         u64 wfe_exit_stat;
 203         u64 wfi_exit_stat;
 204         u64 mmio_exit_user;
 205         u64 mmio_exit_kernel;
 206         u64 exits;
 207 };
 208
 209 #define vcpu_cp15(v,r)  (v)->arch.ctxt.cp15[r]
 210
 211 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 212 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 213 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 214 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 215 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 216 unsigned long kvm_call_hyp(void *hypfn, ...);
 217 void force_vm_exit(const cpumask_t *mask);
 218
 219 #define KVM_ARCH_WANT_MMU_NOTIFIER
 220 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 221 int kvm_unmap_hva_range(struct kvm *kvm,
 222                         unsigned long start, unsigned long end);
 223 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 224
 225 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 226 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 227 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 228 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 229
 230 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 231 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 232 void kvm_arm_halt_guest(struct kvm *kvm);
 233 void kvm_arm_resume_guest(struct kvm *kvm);
 234
 235 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 236 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 237 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 238 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 239
 240 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 241                 int exception_index);
 242
 243 static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
 244                                      int exception_index) {}
 245
 246 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
 247                                        unsigned long hyp_stack_ptr,
 248                                        unsigned long vector_ptr)
 249 {
 250         /*
 251          * Call initialization code, and switch to the full blown HYP
 252          * code. The init code doesn't need to preserve these
 253          * registers as r0-r3 are already callee saved according to
 254          * the AAPCS.
 255          * Note that we slightly misuse the prototype by casting the
 256          * stack pointer to a void *.
 257
 258          * The PGDs are always passed as the third argument, in order
 259          * to be passed into r2-r3 to the init code (yes, this is
 260          * compliant with the PCS!).
 261          */
 262
 263         kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 264 }
 265
 266 static inline void __cpu_init_stage2(void)
 267 {
 268         kvm_call_hyp(__init_stage2_translation);
 269 }
 270
 271 static inline int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
 272 {
 273         return 0;
 274 }
 275
 276 int kvm_perf_init(void);
 277 int kvm_perf_teardown(void);
 278
 279 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 280
 281 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 282
 283 static inline void kvm_arch_hardware_unsetup(void) {}
 284 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 285 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 286 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 287 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 288
 289 static inline void kvm_arm_init_debug(void) {}
 290 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 291 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 292 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 293 static inline bool kvm_arm_handle_step_debug(struct kvm_vcpu *vcpu,
 294                                              struct kvm_run *run)
 295 {
 296         return false;
 297 }
 298
 299 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 300                                struct kvm_device_attr *attr);
 301 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 302                                struct kvm_device_attr *attr);
 303 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 304                                struct kvm_device_attr *attr);
 305
 306 /* All host FP/SIMD state is restored on guest exit, so nothing to save: */
 307 static inline void kvm_fpsimd_flush_cpu_state(void) {}
 308
 309 static inline void kvm_arm_vhe_guest_enter(void) {}
 310 static inline void kvm_arm_vhe_guest_exit(void) {}
 311
 312 static inline bool kvm_arm_harden_branch_predictor(void)
 313 {
 314         /* No way to detect it yet, pretend it is not there. */
 315         return false;
 316 }
 317
 318 #endif /* __ARM_KVM_HOST_H__ */