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 1
  40
  41 /* We don't currently support large pages. */
  42 #define KVM_HPAGE_GFN_SHIFT(x)  0
  43 #define KVM_NR_PAGE_SIZES       1
  44 #define KVM_PAGES_PER_HPAGE(x)  (1UL<<31)
  45
  46 #include <kvm/arm_vgic.h>
  47
  48 struct kvm_vcpu;
  49 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  50 int kvm_target_cpu(void);
  51 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  52 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  53
  54 struct kvm_arch {
  55         /* VTTBR value associated with below pgd and vmid */
  56         u64    vttbr;
  57
  58         /* Timer */
  59         struct arch_timer_kvm   timer;
  60
  61         /*
  62          * Anything that is not used directly from assembly code goes
  63          * here.
  64          */
  65
  66         /* The VMID generation used for the virt. memory system */
  67         u64    vmid_gen;
  68         u32    vmid;
  69
  70         /* Stage-2 page table */
  71         pgd_t *pgd;
  72
  73         /* Interrupt controller */
  74         struct vgic_dist        vgic;
  75 };
  76
  77 #define KVM_NR_MEM_OBJS     40
  78
  79 /*
  80  * We don't want allocation failures within the mmu code, so we preallocate
  81  * enough memory for a single page fault in a cache.
  82  */
  83 struct kvm_mmu_memory_cache {
  84         int nobjs;
  85         void *objects[KVM_NR_MEM_OBJS];
  86 };
  87
  88 struct kvm_vcpu_fault_info {
  89         u32 hsr;                /* Hyp Syndrome Register */
  90         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  91         u32 hpfar;              /* Hyp IPA Fault Address Register */
  92         u32 hyp_pc;             /* PC when exception was taken from Hyp mode */
  93 };
  94
  95 typedef struct vfp_hard_struct kvm_cpu_context_t;
  96
  97 struct kvm_vcpu_arch {
  98         struct kvm_regs regs;
  99
 100         int target; /* Processor target */
 101         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 102
 103         /* System control coprocessor (cp15) */
 104         u32 cp15[NR_CP15_REGS];
 105
 106         /* The CPU type we expose to the VM */
 107         u32 midr;
 108
 109         /* Exception Information */
 110         struct kvm_vcpu_fault_info fault;
 111
 112         /* Floating point registers (VFP and Advanced SIMD/NEON) */
 113         struct vfp_hard_struct vfp_guest;
 114
 115         /* Host FP context */
 116         kvm_cpu_context_t *host_cpu_context;
 117
 118         /* VGIC state */
 119         struct vgic_cpu vgic_cpu;
 120         struct arch_timer_cpu timer_cpu;
 121
 122         /*
 123          * Anything that is not used directly from assembly code goes
 124          * here.
 125          */
 126         /* dcache set/way operation pending */
 127         int last_pcpu;
 128         cpumask_t require_dcache_flush;
 129
 130         /* Don't run the guest on this vcpu */
 131         bool pause;
 132
 133         /* IO related fields */
 134         struct kvm_decode mmio_decode;
 135
 136         /* Interrupt related fields */
 137         u32 irq_lines;          /* IRQ and FIQ levels */
 138
 139         /* Cache some mmu pages needed inside spinlock regions */
 140         struct kvm_mmu_memory_cache mmu_page_cache;
 141
 142         /* Detect first run of a vcpu */
 143         bool has_run_once;
 144 };
 145
 146 struct kvm_vm_stat {
 147         u32 remote_tlb_flush;
 148 };
 149
 150 struct kvm_vcpu_stat {
 151         u32 halt_wakeup;
 152 };
 153
 154 struct kvm_vcpu_init;
 155 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 156                         const struct kvm_vcpu_init *init);
 157 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 158 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 159 struct kvm_one_reg;
 160 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 161 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 162 u64 kvm_call_hyp(void *hypfn, ...);
 163 void force_vm_exit(const cpumask_t *mask);
 164
 165 #define KVM_ARCH_WANT_MMU_NOTIFIER
 166 struct kvm;
 167 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 168 int kvm_unmap_hva_range(struct kvm *kvm,
 169                         unsigned long start, unsigned long end);
 170 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 171
 172 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 173 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 174
 175 /* We do not have shadow page tables, hence the empty hooks */
 176 static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
 177 {
 178         return 0;
 179 }
 180
 181 static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
 182 {
 183         return 0;
 184 }
 185
 186 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 187 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 188
 189 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 190 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 191 struct kvm_one_reg;
 192 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 193 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 194
 195 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 196                 int exception_index);
 197
 198 static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
 199                                        phys_addr_t pgd_ptr,
 200                                        unsigned long hyp_stack_ptr,
 201                                        unsigned long vector_ptr)
 202 {
 203         /*
 204          * Call initialization code, and switch to the full blown HYP
 205          * code. The init code doesn't need to preserve these
 206          * registers as r0-r3 are already callee saved according to
 207          * the AAPCS.
 208          * Note that we slightly misuse the prototype by casing the
 209          * stack pointer to a void *.
 210          *
 211          * We don't have enough registers to perform the full init in
 212          * one go.  Install the boot PGD first, and then install the
 213          * runtime PGD, stack pointer and vectors. The PGDs are always
 214          * passed as the third argument, in order to be passed into
 215          * r2-r3 to the init code (yes, this is compliant with the
 216          * PCS!).
 217          */
 218
 219         kvm_call_hyp(NULL, 0, boot_pgd_ptr);
 220
 221         kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 222 }
 223
 224 static inline int kvm_arch_dev_ioctl_check_extension(long ext)
 225 {
 226         return 0;
 227 }
 228
 229 int kvm_perf_init(void);
 230 int kvm_perf_teardown(void);
 231
 232 #endif /* __ARM_KVM_HOST_H__ */