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 <kvm/arm_arch_timer.h>
  27
  28 #if defined(CONFIG_KVM_ARM_MAX_VCPUS)
  29 #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
  30 #else
  31 #define KVM_MAX_VCPUS 0
  32 #endif
  33
  34 #define KVM_USER_MEM_SLOTS 32
  35 #define KVM_PRIVATE_MEM_SLOTS 4
  36 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  37 #define KVM_HAVE_ONE_REG
  38
  39 #define KVM_VCPU_MAX_FEATURES 2
  40
  41 #include <kvm/arm_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_cpu_context_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         /* HYP trapping configuration */
 105         u32 hcr;
 106
 107         /* Interrupt related fields */
 108         u32 irq_lines;          /* IRQ and FIQ levels */
 109
 110         /* Exception Information */
 111         struct kvm_vcpu_fault_info fault;
 112
 113         /* Floating point registers (VFP and Advanced SIMD/NEON) */
 114         struct vfp_hard_struct vfp_guest;
 115
 116         /* Host FP context */
 117         kvm_cpu_context_t *host_cpu_context;
 118
 119         /* VGIC state */
 120         struct vgic_cpu vgic_cpu;
 121         struct arch_timer_cpu timer_cpu;
 122
 123         /*
 124          * Anything that is not used directly from assembly code goes
 125          * here.
 126          */
 127         /* dcache set/way operation pending */
 128         int last_pcpu;
 129         cpumask_t require_dcache_flush;
 130
 131         /* Don't run the guest on this vcpu */
 132         bool pause;
 133
 134         /* IO related fields */
 135         struct kvm_decode mmio_decode;
 136
 137         /* Cache some mmu pages needed inside spinlock regions */
 138         struct kvm_mmu_memory_cache mmu_page_cache;
 139
 140         /* Detect first run of a vcpu */
 141         bool has_run_once;
 142 };
 143
 144 struct kvm_vm_stat {
 145         u32 remote_tlb_flush;
 146 };
 147
 148 struct kvm_vcpu_stat {
 149         u32 halt_wakeup;
 150 };
 151
 152 struct kvm_vcpu_init;
 153 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 154                         const struct kvm_vcpu_init *init);
 155 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 156 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 157 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 158 struct kvm_one_reg;
 159 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 160 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 161 u64 kvm_call_hyp(void *hypfn, ...);
 162 void force_vm_exit(const cpumask_t *mask);
 163
 164 #define KVM_ARCH_WANT_MMU_NOTIFIER
 165 struct kvm;
 166 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 167 int kvm_unmap_hva_range(struct kvm *kvm,
 168                         unsigned long start, unsigned long end);
 169 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 170
 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
 174 /* We do not have shadow page tables, hence the empty hooks */
 175 static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
 176 {
 177         return 0;
 178 }
 179
 180 static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
 181 {
 182         return 0;
 183 }
 184
 185 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 186 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 187
 188 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 189 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 190 struct kvm_one_reg;
 191 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 192 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 193
 194 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 195                 int exception_index);
 196
 197 static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
 198                                        phys_addr_t pgd_ptr,
 199                                        unsigned long hyp_stack_ptr,
 200                                        unsigned long vector_ptr)
 201 {
 202         /*
 203          * Call initialization code, and switch to the full blown HYP
 204          * code. The init code doesn't need to preserve these
 205          * registers as r0-r3 are already callee saved according to
 206          * the AAPCS.
 207          * Note that we slightly misuse the prototype by casing the
 208          * stack pointer to a void *.
 209          *
 210          * We don't have enough registers to perform the full init in
 211          * one go.  Install the boot PGD first, and then install the
 212          * runtime PGD, stack pointer and vectors. The PGDs are always
 213          * passed as the third argument, in order to be passed into
 214          * r2-r3 to the init code (yes, this is compliant with the
 215          * PCS!).
 216          */
 217
 218         kvm_call_hyp(NULL, 0, boot_pgd_ptr);
 219
 220         kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 221 }
 222
 223 static inline int kvm_arch_dev_ioctl_check_extension(long ext)
 224 {
 225         return 0;
 226 }
 227
 228 int kvm_perf_init(void);
 229 int kvm_perf_teardown(void);
 230
 231 u64 kvm_arm_timer_get_reg(struct kvm_vcpu *, u64 regid);
 232 int kvm_arm_timer_set_reg(struct kvm_vcpu *, u64 regid, u64 value);
 233
 234 #endif /* __ARM_KVM_HOST_H__ */