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 <asm/kvm.h>
  23 #include <asm/kvm_asm.h>
  24 #include <asm/kvm_mmio.h>
  25 #include <asm/fpstate.h>
  26 #include <asm/kvm_arch_timer.h>
  27
  28 #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
  29 #define KVM_USER_MEM_SLOTS 32
  30 #define KVM_PRIVATE_MEM_SLOTS 4
  31 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  32 #define KVM_HAVE_ONE_REG
  33
  34 #define KVM_VCPU_MAX_FEATURES 1
  35
  36 /* We don't currently support large pages. */
  37 #define KVM_HPAGE_GFN_SHIFT(x)  0
  38 #define KVM_NR_PAGE_SIZES       1
  39 #define KVM_PAGES_PER_HPAGE(x)  (1UL<<31)
  40
  41 #include <asm/kvm_vgic.h>
  42
  43 struct kvm_vcpu;
  44 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  45 int kvm_target_cpu(void);
  46 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  47 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  48
  49 struct kvm_arch {
  50         /* VTTBR value associated with below pgd and vmid */
  51         u64    vttbr;
  52
  53         /* Timer */
  54         struct arch_timer_kvm   timer;
  55
  56         /*
  57          * Anything that is not used directly from assembly code goes
  58          * here.
  59          */
  60
  61         /* The VMID generation used for the virt. memory system */
  62         u64    vmid_gen;
  63         u32    vmid;
  64
  65         /* Stage-2 page table */
  66         pgd_t *pgd;
  67
  68         /* Interrupt controller */
  69         struct vgic_dist        vgic;
  70 };
  71
  72 #define KVM_NR_MEM_OBJS     40
  73
  74 /*
  75  * We don't want allocation failures within the mmu code, so we preallocate
  76  * enough memory for a single page fault in a cache.
  77  */
  78 struct kvm_mmu_memory_cache {
  79         int nobjs;
  80         void *objects[KVM_NR_MEM_OBJS];
  81 };
  82
  83 struct kvm_vcpu_fault_info {
  84         u32 hsr;                /* Hyp Syndrome Register */
  85         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  86         u32 hpfar;              /* Hyp IPA Fault Address Register */
  87         u32 hyp_pc;             /* PC when exception was taken from Hyp mode */
  88 };
  89
  90 typedef struct vfp_hard_struct kvm_kernel_vfp_t;
  91
  92 struct kvm_vcpu_arch {
  93         struct kvm_regs regs;
  94
  95         int target; /* Processor target */
  96         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
  97
  98         /* System control coprocessor (cp15) */
  99         u32 cp15[NR_CP15_REGS];
 100
 101         /* The CPU type we expose to the VM */
 102         u32 midr;
 103
 104         /* Exception Information */
 105         struct kvm_vcpu_fault_info fault;
 106
 107         /* Floating point registers (VFP and Advanced SIMD/NEON) */
 108         kvm_kernel_vfp_t vfp_guest;
 109         kvm_kernel_vfp_t *vfp_host;
 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         /* dcache set/way operation pending */
 120         int last_pcpu;
 121         cpumask_t require_dcache_flush;
 122
 123         /* Don't run the guest on this vcpu */
 124         bool pause;
 125
 126         /* IO related fields */
 127         struct kvm_decode mmio_decode;
 128
 129         /* Interrupt related fields */
 130         u32 irq_lines;          /* IRQ and FIQ levels */
 131
 132         /* Cache some mmu pages needed inside spinlock regions */
 133         struct kvm_mmu_memory_cache mmu_page_cache;
 134
 135         /* Detect first run of a vcpu */
 136         bool has_run_once;
 137 };
 138
 139 struct kvm_vm_stat {
 140         u32 remote_tlb_flush;
 141 };
 142
 143 struct kvm_vcpu_stat {
 144         u32 halt_wakeup;
 145 };
 146
 147 struct kvm_vcpu_init;
 148 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 149                         const struct kvm_vcpu_init *init);
 150 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 151 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 152 struct kvm_one_reg;
 153 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 154 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 155 u64 kvm_call_hyp(void *hypfn, ...);
 156 void force_vm_exit(const cpumask_t *mask);
 157
 158 #define KVM_ARCH_WANT_MMU_NOTIFIER
 159 struct kvm;
 160 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 161 int kvm_unmap_hva_range(struct kvm *kvm,
 162                         unsigned long start, unsigned long end);
 163 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 164
 165 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 166 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 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 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 183 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 184 struct kvm_one_reg;
 185 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 186 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 187
 188 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 189                 int exception_index);
 190
 191 static inline void __cpu_init_hyp_mode(unsigned long long pgd_ptr,
 192                                        unsigned long hyp_stack_ptr,
 193                                        unsigned long vector_ptr)
 194 {
 195         unsigned long pgd_low, pgd_high;
 196
 197         pgd_low = (pgd_ptr & ((1ULL << 32) - 1));
 198         pgd_high = (pgd_ptr >> 32ULL);
 199
 200         /*
 201          * Call initialization code, and switch to the full blown
 202          * HYP code. The init code doesn't need to preserve these registers as
 203          * r1-r3 and r12 are already callee save according to the AAPCS.
 204          * Note that we slightly misuse the prototype by casing the pgd_low to
 205          * a void *.
 206          */
 207         kvm_call_hyp((void *)pgd_low, pgd_high, hyp_stack_ptr, vector_ptr);
 208 }
 209
 210 #endif /* __ARM_KVM_HOST_H__ */