arch/arm64/include/asm/kvm_host.h

   1 /*
   2  * Copyright (C) 2012,2013 - ARM Ltd
   3  * Author: Marc Zyngier <marc.zyngier@arm.com>
   4  *
   5  * Derived from arch/arm/include/asm/kvm_host.h:
   6  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   7  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #ifndef __ARM64_KVM_HOST_H__
  23 #define __ARM64_KVM_HOST_H__
  24
  25 #include <linux/types.h>
  26 #include <linux/kvm_types.h>
  27 #include <asm/kvm.h>
  28 #include <asm/kvm_asm.h>
  29 #include <asm/kvm_mmio.h>
  30
  31 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  32
  33 #define KVM_USER_MEM_SLOTS 32
  34 #define KVM_PRIVATE_MEM_SLOTS 4
  35 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  36 #define KVM_HALT_POLL_NS_DEFAULT 500000
  37
  38 #include <kvm/arm_vgic.h>
  39 #include <kvm/arm_arch_timer.h>
  40
  41 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
  42
  43 #define KVM_VCPU_MAX_FEATURES 3
  44
  45 int __attribute_const__ kvm_target_cpu(void);
  46 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  47 int kvm_arch_dev_ioctl_check_extension(long ext);
  48
  49 struct kvm_arch {
  50         /* The VMID generation used for the virt. memory system */
  51         u64    vmid_gen;
  52         u32    vmid;
  53
  54         /* 1-level 2nd stage table and lock */
  55         spinlock_t pgd_lock;
  56         pgd_t *pgd;
  57
  58         /* VTTBR value associated with above pgd and vmid */
  59         u64    vttbr;
  60
  61         /* The maximum number of vCPUs depends on the used GIC model */
  62         int max_vcpus;
  63
  64         /* Interrupt controller */
  65         struct vgic_dist        vgic;
  66
  67         /* Timer */
  68         struct arch_timer_kvm   timer;
  69 };
  70
  71 #define KVM_NR_MEM_OBJS     40
  72
  73 /*
  74  * We don't want allocation failures within the mmu code, so we preallocate
  75  * enough memory for a single page fault in a cache.
  76  */
  77 struct kvm_mmu_memory_cache {
  78         int nobjs;
  79         void *objects[KVM_NR_MEM_OBJS];
  80 };
  81
  82 struct kvm_vcpu_fault_info {
  83         u32 esr_el2;            /* Hyp Syndrom Register */
  84         u64 far_el2;            /* Hyp Fault Address Register */
  85         u64 hpfar_el2;          /* Hyp IPA Fault Address Register */
  86 };
  87
  88 struct kvm_cpu_context {
  89         struct kvm_regs gp_regs;
  90         union {
  91                 u64 sys_regs[NR_SYS_REGS];
  92                 u32 copro[NR_COPRO_REGS];
  93         };
  94 };
  95
  96 typedef struct kvm_cpu_context kvm_cpu_context_t;
  97
  98 struct kvm_vcpu_arch {
  99         struct kvm_cpu_context ctxt;
 100
 101         /* HYP configuration */
 102         u64 hcr_el2;
 103         u32 mdcr_el2;
 104
 105         /* Exception Information */
 106         struct kvm_vcpu_fault_info fault;
 107
 108         /* Guest debug state */
 109         u64 debug_flags;
 110
 111         /*
 112          * We maintain more than a single set of debug registers to support
 113          * debugging the guest from the host and to maintain separate host and
 114          * guest state during world switches. vcpu_debug_state are the debug
 115          * registers of the vcpu as the guest sees them.  host_debug_state are
 116          * the host registers which are saved and restored during
 117          * world switches. external_debug_state contains the debug
 118          * values we want to debug the guest. This is set via the
 119          * KVM_SET_GUEST_DEBUG ioctl.
 120          *
 121          * debug_ptr points to the set of debug registers that should be loaded
 122          * onto the hardware when running the guest.
 123          */
 124         struct kvm_guest_debug_arch *debug_ptr;
 125         struct kvm_guest_debug_arch vcpu_debug_state;
 126         struct kvm_guest_debug_arch external_debug_state;
 127
 128         /* Pointer to host CPU context */
 129         kvm_cpu_context_t *host_cpu_context;
 130         struct kvm_guest_debug_arch host_debug_state;
 131
 132         /* VGIC state */
 133         struct vgic_cpu vgic_cpu;
 134         struct arch_timer_cpu timer_cpu;
 135
 136         /*
 137          * Anything that is not used directly from assembly code goes
 138          * here.
 139          */
 140
 141         /*
 142          * Guest registers we preserve during guest debugging.
 143          *
 144          * These shadow registers are updated by the kvm_handle_sys_reg
 145          * trap handler if the guest accesses or updates them while we
 146          * are using guest debug.
 147          */
 148         struct {
 149                 u32     mdscr_el1;
 150         } guest_debug_preserved;
 151
 152         /* vcpu power-off state */
 153         bool power_off;
 154
 155         /* Don't run the guest (internal implementation need) */
 156         bool pause;
 157
 158         /* IO related fields */
 159         struct kvm_decode mmio_decode;
 160
 161         /* Interrupt related fields */
 162         u64 irq_lines;          /* IRQ and FIQ levels */
 163
 164         /* Cache some mmu pages needed inside spinlock regions */
 165         struct kvm_mmu_memory_cache mmu_page_cache;
 166
 167         /* Target CPU and feature flags */
 168         int target;
 169         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 170
 171         /* Detect first run of a vcpu */
 172         bool has_run_once;
 173 };
 174
 175 #define vcpu_gp_regs(v)         (&(v)->arch.ctxt.gp_regs)
 176 #define vcpu_sys_reg(v,r)       ((v)->arch.ctxt.sys_regs[(r)])
 177 /*
 178  * CP14 and CP15 live in the same array, as they are backed by the
 179  * same system registers.
 180  */
 181 #define vcpu_cp14(v,r)          ((v)->arch.ctxt.copro[(r)])
 182 #define vcpu_cp15(v,r)          ((v)->arch.ctxt.copro[(r)])
 183
 184 #ifdef CONFIG_CPU_BIG_ENDIAN
 185 #define vcpu_cp15_64_high(v,r)  vcpu_cp15((v),(r))
 186 #define vcpu_cp15_64_low(v,r)   vcpu_cp15((v),(r) + 1)
 187 #else
 188 #define vcpu_cp15_64_high(v,r)  vcpu_cp15((v),(r) + 1)
 189 #define vcpu_cp15_64_low(v,r)   vcpu_cp15((v),(r))
 190 #endif
 191
 192 struct kvm_vm_stat {
 193         u32 remote_tlb_flush;
 194 };
 195
 196 struct kvm_vcpu_stat {
 197         u32 halt_successful_poll;
 198         u32 halt_attempted_poll;
 199         u32 halt_wakeup;
 200 };
 201
 202 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 203 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 204 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 205 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 206 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 207
 208 #define KVM_ARCH_WANT_MMU_NOTIFIER
 209 int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 210 int kvm_unmap_hva_range(struct kvm *kvm,
 211                         unsigned long start, unsigned long end);
 212 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 213 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 214 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 215
 216 /* We do not have shadow page tables, hence the empty hooks */
 217 static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
 218                                                          unsigned long address)
 219 {
 220 }
 221
 222 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 223 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void);
 224
 225 u64 kvm_call_hyp(void *hypfn, ...);
 226 void force_vm_exit(const cpumask_t *mask);
 227 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 228
 229 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 230                 int exception_index);
 231
 232 int kvm_perf_init(void);
 233 int kvm_perf_teardown(void);
 234
 235 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 236
 237 static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
 238                                        phys_addr_t pgd_ptr,
 239                                        unsigned long hyp_stack_ptr,
 240                                        unsigned long vector_ptr)
 241 {
 242         /*
 243          * Call initialization code, and switch to the full blown
 244          * HYP code.
 245          */
 246         kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr,
 247                      hyp_stack_ptr, vector_ptr);
 248 }
 249
 250 static inline void kvm_arch_hardware_disable(void) {}
 251 static inline void kvm_arch_hardware_unsetup(void) {}
 252 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 253 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 254 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 255
 256 void kvm_arm_init_debug(void);
 257 void kvm_arm_setup_debug(struct kvm_vcpu *vcpu);
 258 void kvm_arm_clear_debug(struct kvm_vcpu *vcpu);
 259 void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu);
 260
 261 #endif /* __ARM64_KVM_HOST_H__ */