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 <linux/types.h>
  23 #include <linux/kvm_types.h>
  24 #include <asm/kvm.h>
  25 #include <asm/kvm_asm.h>
  26 #include <asm/kvm_mmio.h>
  27 #include <asm/fpstate.h>
  28 #include <kvm/arm_arch_timer.h>
  29
  30 #if defined(CONFIG_KVM_ARM_MAX_VCPUS)
  31 #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
  32 #else
  33 #define KVM_MAX_VCPUS 0
  34 #endif
  35
  36 #define KVM_USER_MEM_SLOTS 32
  37 #define KVM_PRIVATE_MEM_SLOTS 4
  38 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  39 #define KVM_HAVE_ONE_REG
  40
  41 #define KVM_VCPU_MAX_FEATURES 2
  42
  43 #include <kvm/arm_vgic.h>
  44
  45 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  46 int __attribute_const__ kvm_target_cpu(void);
  47 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  48 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  49
  50 struct kvm_arch {
  51         /* VTTBR value associated with below pgd and vmid */
  52         u64    vttbr;
  53
  54         /* Timer */
  55         struct arch_timer_kvm   timer;
  56
  57         /*
  58          * Anything that is not used directly from assembly code goes
  59          * here.
  60          */
  61
  62         /* The VMID generation used for the virt. memory system */
  63         u64    vmid_gen;
  64         u32    vmid;
  65
  66         /* Stage-2 page table */
  67         pgd_t *pgd;
  68
  69         /* Interrupt controller */
  70         struct vgic_dist        vgic;
  71 };
  72
  73 #define KVM_NR_MEM_OBJS     40
  74
  75 /*
  76  * We don't want allocation failures within the mmu code, so we preallocate
  77  * enough memory for a single page fault in a cache.
  78  */
  79 struct kvm_mmu_memory_cache {
  80         int nobjs;
  81         void *objects[KVM_NR_MEM_OBJS];
  82 };
  83
  84 struct kvm_vcpu_fault_info {
  85         u32 hsr;                /* Hyp Syndrome Register */
  86         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  87         u32 hpfar;              /* Hyp IPA Fault Address Register */
  88         u32 hyp_pc;             /* PC when exception was taken from Hyp mode */
  89 };
  90
  91 typedef struct vfp_hard_struct kvm_cpu_context_t;
  92
  93 struct kvm_vcpu_arch {
  94         struct kvm_regs regs;
  95
  96         int target; /* Processor target */
  97         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
  98
  99         /* System control coprocessor (cp15) */
 100         u32 cp15[NR_CP15_REGS];
 101
 102         /* The CPU type we expose to the VM */
 103         u32 midr;
 104
 105         /* HYP trapping configuration */
 106         u32 hcr;
 107
 108         /* Interrupt related fields */
 109         u32 irq_lines;          /* IRQ and FIQ levels */
 110
 111         /* Exception Information */
 112         struct kvm_vcpu_fault_info fault;
 113
 114         /* Floating point registers (VFP and Advanced SIMD/NEON) */
 115         struct vfp_hard_struct vfp_guest;
 116
 117         /* Host FP context */
 118         kvm_cpu_context_t *host_cpu_context;
 119
 120         /* VGIC state */
 121         struct vgic_cpu vgic_cpu;
 122         struct arch_timer_cpu timer_cpu;
 123
 124         /*
 125          * Anything that is not used directly from assembly code goes
 126          * here.
 127          */
 128         /* dcache set/way operation pending */
 129         int last_pcpu;
 130         cpumask_t require_dcache_flush;
 131
 132         /* Don't run the guest on this vcpu */
 133         bool pause;
 134
 135         /* IO related fields */
 136         struct kvm_decode mmio_decode;
 137
 138         /* Cache some mmu pages needed inside spinlock regions */
 139         struct kvm_mmu_memory_cache mmu_page_cache;
 140
 141         /* Detect first run of a vcpu */
 142         bool has_run_once;
 143 };
 144
 145 struct kvm_vm_stat {
 146         u32 remote_tlb_flush;
 147 };
 148
 149 struct kvm_vcpu_stat {
 150         u32 halt_wakeup;
 151 };
 152
 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 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 u64 kvm_call_hyp(void *hypfn, ...);
 161 void force_vm_exit(const cpumask_t *mask);
 162
 163 #define KVM_ARCH_WANT_MMU_NOTIFIER
 164 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 165 int kvm_unmap_hva_range(struct kvm *kvm,
 166                         unsigned long start, unsigned long end);
 167 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 168
 169 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 170 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 171
 172 /* We do not have shadow page tables, hence the empty hooks */
 173 static inline int kvm_age_hva(struct kvm *kvm, unsigned long hva)
 174 {
 175         return 0;
 176 }
 177
 178 static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
 179 {
 180         return 0;
 181 }
 182
 183 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 184 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 185
 186 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 187 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 188 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 189 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 190
 191 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 192                 int exception_index);
 193
 194 static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
 195                                        phys_addr_t pgd_ptr,
 196                                        unsigned long hyp_stack_ptr,
 197                                        unsigned long vector_ptr)
 198 {
 199         /*
 200          * Call initialization code, and switch to the full blown HYP
 201          * code. The init code doesn't need to preserve these
 202          * registers as r0-r3 are already callee saved according to
 203          * the AAPCS.
 204          * Note that we slightly misuse the prototype by casing the
 205          * stack pointer to a void *.
 206          *
 207          * We don't have enough registers to perform the full init in
 208          * one go.  Install the boot PGD first, and then install the
 209          * runtime PGD, stack pointer and vectors. The PGDs are always
 210          * passed as the third argument, in order to be passed into
 211          * r2-r3 to the init code (yes, this is compliant with the
 212          * PCS!).
 213          */
 214
 215         kvm_call_hyp(NULL, 0, boot_pgd_ptr);
 216
 217         kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 218 }
 219
 220 static inline int kvm_arch_dev_ioctl_check_extension(long ext)
 221 {
 222         return 0;
 223 }
 224
 225 static inline void vgic_arch_setup(const struct vgic_params *vgic)
 226 {
 227         BUG_ON(vgic->type != VGIC_V2);
 228 }
 229
 230 int kvm_perf_init(void);
 231 int kvm_perf_teardown(void);
 232
 233 static inline void kvm_arch_hardware_disable(void) {}
 234 static inline void kvm_arch_hardware_unsetup(void) {}
 235 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 236 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 237 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 238
 239 #endif /* __ARM_KVM_HOST_H__ */