LXR linux/arch/arm/include/asm/kvm

   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#define KVM_USER_MEM_SLOTS 32
  33#define KVM_PRIVATE_MEM_SLOTS 4
  34#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
  35#define KVM_HAVE_ONE_REG
  36#define KVM_HALT_POLL_NS_DEFAULT 500000
  37
  38#define KVM_VCPU_MAX_FEATURES 2
  39
  40#include <kvm/arm_vgic.h>
  41
  42
  43#ifdef CONFIG_ARM_GIC_V3
  44#define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
  45#else
  46#define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
  47#endif
  48
  49#define KVM_REQ_VCPU_EXIT       8
  50
  51u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  52int __attribute_const__ kvm_target_cpu(void);
  53int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  54void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  55
  56struct kvm_arch {
  57        /* VTTBR value associated with below pgd and vmid */
  58        u64    vttbr;
  59
  60        /* The last vcpu id that ran on each physical CPU */
  61        int __percpu *last_vcpu_ran;
  62
  63        /* Timer */
  64        struct arch_timer_kvm   timer;
  65
  66        /*
  67         * Anything that is not used directly from assembly code goes
  68         * here.
  69         */
  70
  71        /* The VMID generation used for the virt. memory system */
  72        u64    vmid_gen;
  73        u32    vmid;
  74
  75        /* Stage-2 page table */
  76        pgd_t *pgd;
  77
  78        /* Interrupt controller */
  79        struct vgic_dist        vgic;
  80        int max_vcpus;
  81};
  82
  83#define KVM_NR_MEM_OBJS     40
  84
  85/*
  86 * We don't want allocation failures within the mmu code, so we preallocate
  87 * enough memory for a single page fault in a cache.
  88 */
  89struct kvm_mmu_memory_cache {
  90        int nobjs;
  91        void *objects[KVM_NR_MEM_OBJS];
  92};
  93
  94struct kvm_vcpu_fault_info {
  95        u32 hsr;                /* Hyp Syndrome Register */
  96        u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  97        u32 hpfar;              /* Hyp IPA Fault Address Register */
  98};
  99
 100/*
 101 * 0 is reserved as an invalid value.
 102 * Order should be kept in sync with the save/restore code.
 103 */
 104enum vcpu_sysreg {
 105        __INVALID_SYSREG__,
 106        c0_MPIDR,               /* MultiProcessor ID Register */
 107        c0_CSSELR,              /* Cache Size Selection Register */
 108        c1_SCTLR,               /* System Control Register */
 109        c1_ACTLR,               /* Auxiliary Control Register */
 110        c1_CPACR,               /* Coprocessor Access Control */
 111        c2_TTBR0,               /* Translation Table Base Register 0 */
 112        c2_TTBR0_high,          /* TTBR0 top 32 bits */
 113        c2_TTBR1,               /* Translation Table Base Register 1 */
 114        c2_TTBR1_high,          /* TTBR1 top 32 bits */
 115        c2_TTBCR,               /* Translation Table Base Control R. */
 116        c3_DACR,                /* Domain Access Control Register */
 117        c5_DFSR,                /* Data Fault Status Register */
 118        c5_IFSR,                /* Instruction Fault Status Register */
 119        c5_ADFSR,               /* Auxilary Data Fault Status R */
 120        c5_AIFSR,               /* Auxilary Instrunction Fault Status R */
 121        c6_DFAR,                /* Data Fault Address Register */
 122        c6_IFAR,                /* Instruction Fault Address Register */
 123        c7_PAR,                 /* Physical Address Register */
 124        c7_PAR_high,            /* PAR top 32 bits */
 125        c9_L2CTLR,              /* Cortex A15/A7 L2 Control Register */
 126        c10_PRRR,               /* Primary Region Remap Register */
 127        c10_NMRR,               /* Normal Memory Remap Register */
 128        c12_VBAR,               /* Vector Base Address Register */
 129        c13_CID,                /* Context ID Register */
 130        c13_TID_URW,            /* Thread ID, User R/W */
 131        c13_TID_URO,            /* Thread ID, User R/O */
 132        c13_TID_PRIV,           /* Thread ID, Privileged */
 133        c14_CNTKCTL,            /* Timer Control Register (PL1) */
 134        c10_AMAIR0,             /* Auxilary Memory Attribute Indirection Reg0 */
 135        c10_AMAIR1,             /* Auxilary Memory Attribute Indirection Reg1 */
 136        NR_CP15_REGS            /* Number of regs (incl. invalid) */
 137};
 138
 139struct kvm_cpu_context {
 140        struct kvm_regs gp_regs;
 141        struct vfp_hard_struct vfp;
 142        u32 cp15[NR_CP15_REGS];
 143};
 144
 145typedef struct kvm_cpu_context kvm_cpu_context_t;
 146
 147struct kvm_vcpu_arch {
 148        struct kvm_cpu_context ctxt;
 149
 150        int target; /* Processor target */
 151        DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 152
 153        /* The CPU type we expose to the VM */
 154        u32 midr;
 155
 156        /* HYP trapping configuration */
 157        u32 hcr;
 158
 159        /* Interrupt related fields */
 160        u32 irq_lines;          /* IRQ and FIQ levels */
 161
 162        /* Exception Information */
 163        struct kvm_vcpu_fault_info fault;
 164
 165        /* Host FP context */
 166        kvm_cpu_context_t *host_cpu_context;
 167
 168        /* VGIC state */
 169        struct vgic_cpu vgic_cpu;
 170        struct arch_timer_cpu timer_cpu;
 171
 172        /*
 173         * Anything that is not used directly from assembly code goes
 174         * here.
 175         */
 176
 177        /* vcpu power-off state */
 178        bool power_off;
 179
 180         /* Don't run the guest (internal implementation need) */
 181        bool pause;
 182
 183        /* IO related fields */
 184        struct kvm_decode mmio_decode;
 185
 186        /* Cache some mmu pages needed inside spinlock regions */
 187        struct kvm_mmu_memory_cache mmu_page_cache;
 188
 189        /* Detect first run of a vcpu */
 190        bool has_run_once;
 191};
 192
 193struct kvm_vm_stat {
 194        ulong remote_tlb_flush;
 195};
 196
 197struct kvm_vcpu_stat {
 198        u64 halt_successful_poll;
 199        u64 halt_attempted_poll;
 200        u64 halt_poll_invalid;
 201        u64 halt_wakeup;
 202        u64 hvc_exit_stat;
 203        u64 wfe_exit_stat;
 204        u64 wfi_exit_stat;
 205        u64 mmio_exit_user;
 206        u64 mmio_exit_kernel;
 207        u64 exits;
 208};
 209
 210#define vcpu_cp15(v,r)  (v)->arch.ctxt.cp15[r]
 211
 212int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 213unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 214int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 215int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 216int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 217unsigned long kvm_call_hyp(void *hypfn, ...);
 218void force_vm_exit(const cpumask_t *mask);
 219
 220#define KVM_ARCH_WANT_MMU_NOTIFIER
 221int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 222int kvm_unmap_hva_range(struct kvm *kvm,
 223                        unsigned long start, unsigned long end);
 224void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 225
 226unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 227int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 228int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 229int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 230
 231/* We do not have shadow page tables, hence the empty hooks */
 232static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
 233                                                         unsigned long address)
 234{
 235}
 236
 237struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 238struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 239void kvm_arm_halt_guest(struct kvm *kvm);
 240void kvm_arm_resume_guest(struct kvm *kvm);
 241void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu);
 242void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu);
 243
 244int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 245unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 246int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 247int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 248
 249int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 250                int exception_index);
 251
 252static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
 253                                       unsigned long hyp_stack_ptr,
 254                                       unsigned long vector_ptr)
 255{
 256        /*
 257         * Call initialization code, and switch to the full blown HYP
 258         * code. The init code doesn't need to preserve these
 259         * registers as r0-r3 are already callee saved according to
 260         * the AAPCS.
 261         * Note that we slightly misuse the prototype by casting the
 262         * stack pointer to a void *.
 263
 264         * The PGDs are always passed as the third argument, in order
 265         * to be passed into r2-r3 to the init code (yes, this is
 266         * compliant with the PCS!).
 267         */
 268
 269        kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 270}
 271
 272static inline void __cpu_init_stage2(void)
 273{
 274        kvm_call_hyp(__init_stage2_translation);
 275}
 276
 277static inline void __cpu_reset_hyp_mode(unsigned long vector_ptr,
 278                                        phys_addr_t phys_idmap_start)
 279{
 280        kvm_call_hyp((void *)virt_to_idmap(__kvm_hyp_reset), vector_ptr);
 281}
 282
 283static inline int kvm_arch_dev_ioctl_check_extension(struct kvm *kvm, long ext)
 284{
 285        return 0;
 286}
 287
 288int kvm_perf_init(void);
 289int kvm_perf_teardown(void);
 290
 291void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 292
 293struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 294
 295static inline void kvm_arch_hardware_unsetup(void) {}
 296static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 297static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 298static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 299static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 300
 301static inline void kvm_arm_init_debug(void) {}
 302static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 303static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 304static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 305static inline int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 306                                             struct kvm_device_attr *attr)
 307{
 308        return -ENXIO;
 309}
 310static inline int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 311                                             struct kvm_device_attr *attr)
 312{
 313        return -ENXIO;
 314}
 315static inline int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 316                                             struct kvm_device_attr *attr)
 317{
 318        return -ENXIO;
 319}
 320
 321#endif /* __ARM_KVM_HOST_H__ */
 322