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 2
  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 cp15[NR_CP15_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         /* Pointer to host CPU context */
 105         kvm_cpu_context_t *host_cpu_context;
 106
 107         /* VGIC state */
 108         struct vgic_cpu vgic_cpu;
 109         struct arch_timer_cpu timer_cpu;
 110
 111         /*
 112          * Anything that is not used directly from assembly code goes
 113          * here.
 114          */
 115         /* dcache set/way operation pending */
 116         int last_pcpu;
 117         cpumask_t require_dcache_flush;
 118
 119         /* Don't run the guest */
 120         bool pause;
 121
 122         /* IO related fields */
 123         struct kvm_decode mmio_decode;
 124
 125         /* Interrupt related fields */
 126         u64 irq_lines;          /* IRQ and FIQ levels */
 127
 128         /* Cache some mmu pages needed inside spinlock regions */
 129         struct kvm_mmu_memory_cache mmu_page_cache;
 130
 131         /* Target CPU and feature flags */
 132         int target;
 133         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 134
 135         /* Detect first run of a vcpu */
 136         bool has_run_once;
 137 };
 138
 139 #define vcpu_gp_regs(v)         (&(v)->arch.ctxt.gp_regs)
 140 #define vcpu_sys_reg(v,r)       ((v)->arch.ctxt.sys_regs[(r)])
 141 #define vcpu_cp15(v,r)          ((v)->arch.ctxt.cp15[(r)])
 142
 143 struct kvm_vm_stat {
 144         u32 remote_tlb_flush;
 145 };
 146
 147 struct kvm_vcpu_stat {
 148         u32 halt_wakeup;
 149 };
 150
 151 struct kvm_vcpu_init;
 152 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 153                         const struct kvm_vcpu_init *init);
 154 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 155 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 156 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 157 struct kvm_one_reg;
 158 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 159 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 160
 161 #define KVM_ARCH_WANT_MMU_NOTIFIER
 162 struct kvm;
 163 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 164 int kvm_unmap_hva_range(struct kvm *kvm,
 165                         unsigned long start, unsigned long end);
 166 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 167
 168 /* We do not have shadow page tables, hence the empty hooks */
 169 static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
 170 {
 171         return 0;
 172 }
 173
 174 static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
 175 {
 176         return 0;
 177 }
 178
 179 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 180 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
 181
 182 u64 kvm_call_hyp(void *hypfn, ...);
 183
 184 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 185                 int exception_index);
 186
 187 int kvm_perf_init(void);
 188 int kvm_perf_teardown(void);
 189
 190 static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
 191                                        phys_addr_t pgd_ptr,
 192                                        unsigned long hyp_stack_ptr,
 193                                        unsigned long vector_ptr)
 194 {
 195         /*
 196          * Call initialization code, and switch to the full blown
 197          * HYP code.
 198          */
 199         kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr,
 200                      hyp_stack_ptr, vector_ptr);
 201 }
 202
 203 #endif /* __ARM64_KVM_HOST_H__ */