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