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 <asm/kvm.h>
  26 #include <asm/kvm_asm.h>
  27 #include <asm/kvm_mmio.h>
  28
  29 #if defined(CONFIG_KVM_ARM_MAX_VCPUS)
  30 #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
  31 #else
  32 #define KVM_MAX_VCPUS 0
  33 #endif
  34
  35 #define KVM_USER_MEM_SLOTS 32
  36 #define KVM_PRIVATE_MEM_SLOTS 4
  37 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  38
  39 #include <kvm/arm_vgic.h>
  40 #include <kvm/arm_arch_timer.h>
  41
  42 #define KVM_VCPU_MAX_FEATURES 3
  43
  44 struct kvm_vcpu;
  45 int __attribute_const__ kvm_target_cpu(void);
  46 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  47 int kvm_arch_dev_ioctl_check_extension(long ext);
  48
  49 struct kvm_arch {
  50         /* The VMID generation used for the virt. memory system */
  51         u64    vmid_gen;
  52         u32    vmid;
  53
  54         /* 1-level 2nd stage table and lock */
  55         spinlock_t pgd_lock;
  56         pgd_t *pgd;
  57
  58         /* VTTBR value associated with above pgd and vmid */
  59         u64    vttbr;
  60
  61         /* Interrupt controller */
  62         struct vgic_dist        vgic;
  63
  64         /* Timer */
  65         struct arch_timer_kvm   timer;
  66 };
  67
  68 #define KVM_NR_MEM_OBJS     40
  69
  70 /*
  71  * We don't want allocation failures within the mmu code, so we preallocate
  72  * enough memory for a single page fault in a cache.
  73  */
  74 struct kvm_mmu_memory_cache {
  75         int nobjs;
  76         void *objects[KVM_NR_MEM_OBJS];
  77 };
  78
  79 struct kvm_vcpu_fault_info {
  80         u32 esr_el2;            /* Hyp Syndrom Register */
  81         u64 far_el2;            /* Hyp Fault Address Register */
  82         u64 hpfar_el2;          /* Hyp IPA Fault Address Register */
  83 };
  84
  85 struct kvm_cpu_context {
  86         struct kvm_regs gp_regs;
  87         union {
  88                 u64 sys_regs[NR_SYS_REGS];
  89                 u32 copro[NR_COPRO_REGS];
  90         };
  91 };
  92
  93 typedef struct kvm_cpu_context kvm_cpu_context_t;
  94
  95 struct kvm_vcpu_arch {
  96         struct kvm_cpu_context ctxt;
  97
  98         /* HYP configuration */
  99         u64 hcr_el2;
 100
 101         /* Exception Information */
 102         struct kvm_vcpu_fault_info fault;
 103
 104         /* Debug state */
 105         u64 debug_flags;
 106
 107         /* Pointer to host CPU context */
 108         kvm_cpu_context_t *host_cpu_context;
 109
 110         /* VGIC state */
 111         struct vgic_cpu vgic_cpu;
 112         struct arch_timer_cpu timer_cpu;
 113
 114         /*
 115          * Anything that is not used directly from assembly code goes
 116          * here.
 117          */
 118         /* dcache set/way operation pending */
 119         int last_pcpu;
 120         cpumask_t require_dcache_flush;
 121
 122         /* Don't run the guest */
 123         bool pause;
 124
 125         /* IO related fields */
 126         struct kvm_decode mmio_decode;
 127
 128         /* Interrupt related fields */
 129         u64 irq_lines;          /* IRQ and FIQ levels */
 130
 131         /* Cache some mmu pages needed inside spinlock regions */
 132         struct kvm_mmu_memory_cache mmu_page_cache;
 133
 134         /* Target CPU and feature flags */
 135         int target;
 136         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 137
 138         /* Detect first run of a vcpu */
 139         bool has_run_once;
 140 };
 141
 142 #define vcpu_gp_regs(v)         (&(v)->arch.ctxt.gp_regs)
 143 #define vcpu_sys_reg(v,r)       ((v)->arch.ctxt.sys_regs[(r)])
 144 /*
 145  * CP14 and CP15 live in the same array, as they are backed by the
 146  * same system registers.
 147  */
 148 #define vcpu_cp14(v,r)          ((v)->arch.ctxt.copro[(r)])
 149 #define vcpu_cp15(v,r)          ((v)->arch.ctxt.copro[(r)])
 150
 151 #ifdef CONFIG_CPU_BIG_ENDIAN
 152 #define vcpu_cp15_64_high(v,r)  vcpu_cp15((v),(r))
 153 #define vcpu_cp15_64_low(v,r)   vcpu_cp15((v),(r) + 1)
 154 #else
 155 #define vcpu_cp15_64_high(v,r)  vcpu_cp15((v),(r) + 1)
 156 #define vcpu_cp15_64_low(v,r)   vcpu_cp15((v),(r))
 157 #endif
 158
 159 struct kvm_vm_stat {
 160         u32 remote_tlb_flush;
 161 };
 162
 163 struct kvm_vcpu_stat {
 164         u32 halt_wakeup;
 165 };
 166
 167 struct kvm_vcpu_init;
 168 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 169                         const struct kvm_vcpu_init *init);
 170 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 171 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 172 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 173 struct kvm_one_reg;
 174 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 175 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 176
 177 #define KVM_ARCH_WANT_MMU_NOTIFIER
 178 struct kvm;
 179 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 180 int kvm_unmap_hva_range(struct kvm *kvm,
 181                         unsigned long start, unsigned long end);
 182 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 183
 184 /* We do not have shadow page tables, hence the empty hooks */
 185 static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
 186 {
 187         return 0;
 188 }
 189
 190 static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
 191 {
 192         return 0;
 193 }
 194
 195 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 196 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 197
 198 u64 kvm_call_hyp(void *hypfn, ...);
 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 #endif /* __ARM64_KVM_HOST_H__ */