arch/arm64/include/asm/kvm_host.h

   1 /*
   2  * Copyright (C) 2012,2013 - ARM Ltd
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * Derived from arch/arm/include/asm/kvm_host.h:
   6  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   7  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #ifndef __ARM64_KVM_HOST_H__
  23 #define __ARM64_KVM_HOST_H__
  24
  25 #include <linux/types.h>
  26 #include <linux/kvm_types.h>
  27 #include <asm/kvm.h>
  28 #include <asm/kvm_asm.h>
  29 #include <asm/kvm_mmio.h>
  30
  31 #if defined(CONFIG_KVM_ARM_MAX_VCPUS)
  32 #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
  33 #else
  34 #define KVM_MAX_VCPUS 0
  35 #endif
  36
  37 #define KVM_USER_MEM_SLOTS 32
  38 #define KVM_PRIVATE_MEM_SLOTS 4
  39 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  40
  41 #include <kvm/arm_vgic.h>
  42 #include <kvm/arm_arch_timer.h>
  43
  44 #define KVM_VCPU_MAX_FEATURES 3
  45
  46 int __attribute_const__ kvm_target_cpu(void);
  47 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  48 int kvm_arch_dev_ioctl_check_extension(long ext);
  49
  50 struct kvm_arch {
  51         /* The VMID generation used for the virt. memory system */
  52         u64    vmid_gen;
  53         u32    vmid;
  54
  55         /* 1-level 2nd stage table and lock */
  56         spinlock_t pgd_lock;
  57         pgd_t *pgd;
  58
  59         /* VTTBR value associated with above pgd and vmid */
  60         u64    vttbr;
  61
  62         /* Interrupt controller */
  63         struct vgic_dist        vgic;
  64
  65         /* Timer */
  66         struct arch_timer_kvm   timer;
  67 };
  68
  69 #define KVM_NR_MEM_OBJS     40
  70
  71 /*
  72  * We don't want allocation failures within the mmu code, so we preallocate
  73  * enough memory for a single page fault in a cache.
  74  */
  75 struct kvm_mmu_memory_cache {
  76         int nobjs;
  77         void *objects[KVM_NR_MEM_OBJS];
  78 };
  79
  80 struct kvm_vcpu_fault_info {
  81         u32 esr_el2;            /* Hyp Syndrom Register */
  82         u64 far_el2;            /* Hyp Fault Address Register */
  83         u64 hpfar_el2;          /* Hyp IPA Fault Address Register */
  84 };
  85
  86 struct kvm_cpu_context {
  87         struct kvm_regs gp_regs;
  88         union {
  89                 u64 sys_regs[NR_SYS_REGS];
  90                 u32 copro[NR_COPRO_REGS];
  91         };
  92 };
  93
  94 typedef struct kvm_cpu_context kvm_cpu_context_t;
  95
  96 struct kvm_vcpu_arch {
  97         struct kvm_cpu_context ctxt;
  98
  99         /* HYP configuration */
 100         u64 hcr_el2;
 101
 102         /* Exception Information */
 103         struct kvm_vcpu_fault_info fault;
 104
 105         /* Debug state */
 106         u64 debug_flags;
 107
 108         /* Pointer to host CPU context */
 109         kvm_cpu_context_t *host_cpu_context;
 110
 111         /* VGIC state */
 112         struct vgic_cpu vgic_cpu;
 113         struct arch_timer_cpu timer_cpu;
 114
 115         /*
 116          * Anything that is not used directly from assembly code goes
 117          * here.
 118          */
 119
 120         /* Don't run the guest */
 121         bool pause;
 122
 123         /* IO related fields */
 124         struct kvm_decode mmio_decode;
 125
 126         /* Interrupt related fields */
 127         u64 irq_lines;          /* IRQ and FIQ levels */
 128
 129         /* Cache some mmu pages needed inside spinlock regions */
 130         struct kvm_mmu_memory_cache mmu_page_cache;
 131
 132         /* Target CPU and feature flags */
 133         int target;
 134         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 135
 136         /* Detect first run of a vcpu */
 137         bool has_run_once;
 138 };
 139
 140 #define vcpu_gp_regs(v)         (&(v)->arch.ctxt.gp_regs)
 141 #define vcpu_sys_reg(v,r)       ((v)->arch.ctxt.sys_regs[(r)])
 142 /*
 143  * CP14 and CP15 live in the same array, as they are backed by the
 144  * same system registers.
 145  */
 146 #define vcpu_cp14(v,r)          ((v)->arch.ctxt.copro[(r)])
 147 #define vcpu_cp15(v,r)          ((v)->arch.ctxt.copro[(r)])
 148
 149 #ifdef CONFIG_CPU_BIG_ENDIAN
 150 #define vcpu_cp15_64_high(v,r)  vcpu_cp15((v),(r))
 151 #define vcpu_cp15_64_low(v,r)   vcpu_cp15((v),(r) + 1)
 152 #else
 153 #define vcpu_cp15_64_high(v,r)  vcpu_cp15((v),(r) + 1)
 154 #define vcpu_cp15_64_low(v,r)   vcpu_cp15((v),(r))
 155 #endif
 156
 157 struct kvm_vm_stat {
 158         u32 remote_tlb_flush;
 159 };
 160
 161 struct kvm_vcpu_stat {
 162         u32 halt_wakeup;
 163 };
 164
 165 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 166 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 167 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 168 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 169 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 170
 171 #define KVM_ARCH_WANT_MMU_NOTIFIER
 172 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 173 int kvm_unmap_hva_range(struct kvm *kvm,
 174                         unsigned long start, unsigned long end);
 175 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 176
 177 /* We do not have shadow page tables, hence the empty hooks */
 178 static inline int kvm_age_hva(struct kvm *kvm, unsigned long start,
 179                               unsigned long end)
 180 {
 181         return 0;
 182 }
 183
 184 static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
 185 {
 186         return 0;
 187 }
 188
 189 static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
 190                                                          unsigned long address)
 191 {
 192 }
 193
 194 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 195 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
 196
 197 u64 kvm_call_hyp(void *hypfn, ...);
 198 void force_vm_exit(const cpumask_t *mask);
 199
 200 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 201                 int exception_index);
 202
 203 int kvm_perf_init(void);
 204 int kvm_perf_teardown(void);
 205
 206 static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
 207                                        phys_addr_t pgd_ptr,
 208                                        unsigned long hyp_stack_ptr,
 209                                        unsigned long vector_ptr)
 210 {
 211         /*
 212          * Call initialization code, and switch to the full blown
 213          * HYP code.
 214          */
 215         kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr,
 216                      hyp_stack_ptr, vector_ptr);
 217 }
 218
 219 struct vgic_sr_vectors {
 220         void    *save_vgic;
 221         void    *restore_vgic;
 222 };
 223
 224 static inline void vgic_arch_setup(const struct vgic_params *vgic)
 225 {
 226         extern struct vgic_sr_vectors __vgic_sr_vectors;
 227
 228         switch(vgic->type)
 229         {
 230         case VGIC_V2:
 231                 __vgic_sr_vectors.save_vgic     = __save_vgic_v2_state;
 232                 __vgic_sr_vectors.restore_vgic  = __restore_vgic_v2_state;
 233                 break;
 234
 235 #ifdef CONFIG_ARM_GIC_V3
 236         case VGIC_V3:
 237                 __vgic_sr_vectors.save_vgic     = __save_vgic_v3_state;
 238                 __vgic_sr_vectors.restore_vgic  = __restore_vgic_v3_state;
 239                 break;
 240 #endif
 241
 242         default:
 243                 BUG();
 244         }
 245 }
 246
 247 static inline void kvm_arch_hardware_disable(void) {}
 248 static inline void kvm_arch_hardware_unsetup(void) {}
 249 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 250 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 251 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 252
 253 #endif /* __ARM64_KVM_HOST_H__ */