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 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  31
  32 #if defined(CONFIG_KVM_ARM_MAX_VCPUS)
  33 #define KVM_MAX_VCPUS CONFIG_KVM_ARM_MAX_VCPUS
  34 #else
  35 #define KVM_MAX_VCPUS 0
  36 #endif
  37
  38 #define KVM_USER_MEM_SLOTS 32
  39 #define KVM_PRIVATE_MEM_SLOTS 4
  40 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  41 #define KVM_HAVE_ONE_REG
  42
  43 #define KVM_VCPU_MAX_FEATURES 2
  44
  45 #include <kvm/arm_vgic.h>
  46
  47 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  48 int __attribute_const__ kvm_target_cpu(void);
  49 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  50 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  51
  52 struct kvm_arch {
  53         /* VTTBR value associated with below pgd and vmid */
  54         u64    vttbr;
  55
  56         /* Timer */
  57         struct arch_timer_kvm   timer;
  58
  59         /*
  60          * Anything that is not used directly from assembly code goes
  61          * here.
  62          */
  63
  64         /* The VMID generation used for the virt. memory system */
  65         u64    vmid_gen;
  66         u32    vmid;
  67
  68         /* Stage-2 page table */
  69         pgd_t *pgd;
  70
  71         /* Interrupt controller */
  72         struct vgic_dist        vgic;
  73         int max_vcpus;
  74 };
  75
  76 #define KVM_NR_MEM_OBJS     40
  77
  78 /*
  79  * We don't want allocation failures within the mmu code, so we preallocate
  80  * enough memory for a single page fault in a cache.
  81  */
  82 struct kvm_mmu_memory_cache {
  83         int nobjs;
  84         void *objects[KVM_NR_MEM_OBJS];
  85 };
  86
  87 struct kvm_vcpu_fault_info {
  88         u32 hsr;                /* Hyp Syndrome Register */
  89         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  90         u32 hpfar;              /* Hyp IPA Fault Address Register */
  91         u32 hyp_pc;             /* PC when exception was taken from Hyp mode */
  92 };
  93
  94 typedef struct vfp_hard_struct kvm_cpu_context_t;
  95
  96 struct kvm_vcpu_arch {
  97         struct kvm_regs regs;
  98
  99         int target; /* Processor target */
 100         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 101
 102         /* System control coprocessor (cp15) */
 103         u32 cp15[NR_CP15_REGS];
 104
 105         /* The CPU type we expose to the VM */
 106         u32 midr;
 107
 108         /* HYP trapping configuration */
 109         u32 hcr;
 110
 111         /* Interrupt related fields */
 112         u32 irq_lines;          /* IRQ and FIQ levels */
 113
 114         /* Exception Information */
 115         struct kvm_vcpu_fault_info fault;
 116
 117         /* Floating point registers (VFP and Advanced SIMD/NEON) */
 118         struct vfp_hard_struct vfp_guest;
 119
 120         /* Host FP context */
 121         kvm_cpu_context_t *host_cpu_context;
 122
 123         /* VGIC state */
 124         struct vgic_cpu vgic_cpu;
 125         struct arch_timer_cpu timer_cpu;
 126
 127         /*
 128          * Anything that is not used directly from assembly code goes
 129          * here.
 130          */
 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_successful_poll;
 151         u32 halt_wakeup;
 152 };
 153
 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 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 158 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 159 u64 kvm_call_hyp(void *hypfn, ...);
 160 void force_vm_exit(const cpumask_t *mask);
 161
 162 #define KVM_ARCH_WANT_MMU_NOTIFIER
 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 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 169 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 170 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 171 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 172
 173 /* We do not have shadow page tables, hence the empty hooks */
 174 static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
 175                                                          unsigned long address)
 176 {
 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 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 185 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 186
 187 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 188                 int exception_index);
 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 HYP
 197          * code. The init code doesn't need to preserve these
 198          * registers as r0-r3 are already callee saved according to
 199          * the AAPCS.
 200          * Note that we slightly misuse the prototype by casing the
 201          * stack pointer to a void *.
 202          *
 203          * We don't have enough registers to perform the full init in
 204          * one go.  Install the boot PGD first, and then install the
 205          * runtime PGD, stack pointer and vectors. The PGDs are always
 206          * passed as the third argument, in order to be passed into
 207          * r2-r3 to the init code (yes, this is compliant with the
 208          * PCS!).
 209          */
 210
 211         kvm_call_hyp(NULL, 0, boot_pgd_ptr);
 212
 213         kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 214 }
 215
 216 static inline int kvm_arch_dev_ioctl_check_extension(long ext)
 217 {
 218         return 0;
 219 }
 220
 221 int kvm_perf_init(void);
 222 int kvm_perf_teardown(void);
 223
 224 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 225
 226 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 227
 228 static inline void kvm_arch_hardware_disable(void) {}
 229 static inline void kvm_arch_hardware_unsetup(void) {}
 230 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 231 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 232 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 233
 234 static inline void kvm_arm_init_debug(void) {}
 235 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 236 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 237 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 238
 239 #endif /* __ARM_KVM_HOST_H__ */