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