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#define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
  43
  44#define KVM_REQ_VCPU_EXIT       8
  45
  46u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  47int __attribute_const__ kvm_target_cpu(void);
  48int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  49void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  50
  51struct kvm_arch {
  52        /* VTTBR value associated with below pgd and vmid */
  53        u64    vttbr;
  54
  55        /* Timer */
  56        struct arch_timer_kvm   timer;
  57
  58        /*
  59         * Anything that is not used directly from assembly code goes
  60         * here.
  61         */
  62
  63        /* The VMID generation used for the virt. memory system */
  64        u64    vmid_gen;
  65        u32    vmid;
  66
  67        /* Stage-2 page table */
  68        pgd_t *pgd;
  69
  70        /* Interrupt controller */
  71        struct vgic_dist        vgic;
  72        int max_vcpus;
  73};
  74
  75#define KVM_NR_MEM_OBJS     40
  76
  77/*
  78 * We don't want allocation failures within the mmu code, so we preallocate
  79 * enough memory for a single page fault in a cache.
  80 */
  81struct kvm_mmu_memory_cache {
  82        int nobjs;
  83        void *objects[KVM_NR_MEM_OBJS];
  84};
  85
  86struct kvm_vcpu_fault_info {
  87        u32 hsr;                /* Hyp Syndrome Register */
  88        u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  89        u32 hpfar;              /* Hyp IPA Fault Address Register */
  90};
  91
  92/*
  93 * 0 is reserved as an invalid value.
  94 * Order should be kept in sync with the save/restore code.
  95 */
  96enum vcpu_sysreg {
  97        __INVALID_SYSREG__,
  98        c0_MPIDR,               /* MultiProcessor ID Register */
  99        c0_CSSELR,              /* Cache Size Selection Register */
 100        c1_SCTLR,               /* System Control Register */
 101        c1_ACTLR,               /* Auxiliary Control Register */
 102        c1_CPACR,               /* Coprocessor Access Control */
 103        c2_TTBR0,               /* Translation Table Base Register 0 */
 104        c2_TTBR0_high,          /* TTBR0 top 32 bits */
 105        c2_TTBR1,               /* Translation Table Base Register 1 */
 106        c2_TTBR1_high,          /* TTBR1 top 32 bits */
 107        c2_TTBCR,               /* Translation Table Base Control R. */
 108        c3_DACR,                /* Domain Access Control Register */
 109        c5_DFSR,                /* Data Fault Status Register */
 110        c5_IFSR,                /* Instruction Fault Status Register */
 111        c5_ADFSR,               /* Auxilary Data Fault Status R */
 112        c5_AIFSR,               /* Auxilary Instrunction Fault Status R */
 113        c6_DFAR,                /* Data Fault Address Register */
 114        c6_IFAR,                /* Instruction Fault Address Register */
 115        c7_PAR,                 /* Physical Address Register */
 116        c7_PAR_high,            /* PAR top 32 bits */
 117        c9_L2CTLR,              /* Cortex A15/A7 L2 Control Register */
 118        c10_PRRR,               /* Primary Region Remap Register */
 119        c10_NMRR,               /* Normal Memory Remap Register */
 120        c12_VBAR,               /* Vector Base Address Register */
 121        c13_CID,                /* Context ID Register */
 122        c13_TID_URW,            /* Thread ID, User R/W */
 123        c13_TID_URO,            /* Thread ID, User R/O */
 124        c13_TID_PRIV,           /* Thread ID, Privileged */
 125        c14_CNTKCTL,            /* Timer Control Register (PL1) */
 126        c10_AMAIR0,             /* Auxilary Memory Attribute Indirection Reg0 */
 127        c10_AMAIR1,             /* Auxilary Memory Attribute Indirection Reg1 */
 128        NR_CP15_REGS            /* Number of regs (incl. invalid) */
 129};
 130
 131struct kvm_cpu_context {
 132        struct kvm_regs gp_regs;
 133        struct vfp_hard_struct vfp;
 134        u32 cp15[NR_CP15_REGS];
 135};
 136
 137typedef struct kvm_cpu_context kvm_cpu_context_t;
 138
 139struct kvm_vcpu_arch {
 140        struct kvm_cpu_context ctxt;
 141
 142        int target; /* Processor target */
 143        DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 144
 145        /* The CPU type we expose to the VM */
 146        u32 midr;
 147
 148        /* HYP trapping configuration */
 149        u32 hcr;
 150
 151        /* Interrupt related fields */
 152        u32 irq_lines;          /* IRQ and FIQ levels */
 153
 154        /* Exception Information */
 155        struct kvm_vcpu_fault_info fault;
 156
 157        /* Host FP context */
 158        kvm_cpu_context_t *host_cpu_context;
 159
 160        /* VGIC state */
 161        struct vgic_cpu vgic_cpu;
 162        struct arch_timer_cpu timer_cpu;
 163
 164        /*
 165         * Anything that is not used directly from assembly code goes
 166         * here.
 167         */
 168
 169        /* vcpu power-off state */
 170        bool power_off;
 171
 172         /* Don't run the guest (internal implementation need) */
 173        bool pause;
 174
 175        /* IO related fields */
 176        struct kvm_decode mmio_decode;
 177
 178        /* Cache some mmu pages needed inside spinlock regions */
 179        struct kvm_mmu_memory_cache mmu_page_cache;
 180
 181        /* Detect first run of a vcpu */
 182        bool has_run_once;
 183};
 184
 185struct kvm_vm_stat {
 186        u32 remote_tlb_flush;
 187};
 188
 189struct kvm_vcpu_stat {
 190        u32 halt_successful_poll;
 191        u32 halt_attempted_poll;
 192        u32 halt_poll_invalid;
 193        u32 halt_wakeup;
 194        u32 hvc_exit_stat;
 195        u64 wfe_exit_stat;
 196        u64 wfi_exit_stat;
 197        u64 mmio_exit_user;
 198        u64 mmio_exit_kernel;
 199        u64 exits;
 200};
 201
 202#define vcpu_cp15(v,r)  (v)->arch.ctxt.cp15[r]
 203
 204int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 205unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 206int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 207int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 208int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 209unsigned long kvm_call_hyp(void *hypfn, ...);
 210void force_vm_exit(const cpumask_t *mask);
 211
 212#define KVM_ARCH_WANT_MMU_NOTIFIER
 213int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 214int kvm_unmap_hva_range(struct kvm *kvm,
 215                        unsigned long start, unsigned long end);
 216void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 217
 218unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 219int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 220int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 221int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 222
 223/* We do not have shadow page tables, hence the empty hooks */
 224static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
 225                                                         unsigned long address)
 226{
 227}
 228
 229struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 230struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 231void kvm_arm_halt_guest(struct kvm *kvm);
 232void kvm_arm_resume_guest(struct kvm *kvm);
 233void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu);
 234void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu);
 235
 236int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 237unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 238int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 239int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 240
 241int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 242                int exception_index);
 243
 244static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
 245                                       phys_addr_t pgd_ptr,
 246                                       unsigned long hyp_stack_ptr,
 247                                       unsigned long vector_ptr)
 248{
 249        /*
 250         * Call initialization code, and switch to the full blown HYP
 251         * code. The init code doesn't need to preserve these
 252         * registers as r0-r3 are already callee saved according to
 253         * the AAPCS.
 254         * Note that we slightly misuse the prototype by casing the
 255         * stack pointer to a void *.
 256         *
 257         * We don't have enough registers to perform the full init in
 258         * one go.  Install the boot PGD first, and then install the
 259         * runtime PGD, stack pointer and vectors. The PGDs are always
 260         * passed as the third argument, in order to be passed into
 261         * r2-r3 to the init code (yes, this is compliant with the
 262         * PCS!).
 263         */
 264
 265        kvm_call_hyp(NULL, 0, boot_pgd_ptr);
 266
 267        kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 268}
 269
 270static inline void __cpu_init_stage2(void)
 271{
 272        kvm_call_hyp(__init_stage2_translation);
 273}
 274
 275static inline void __cpu_reset_hyp_mode(phys_addr_t boot_pgd_ptr,
 276                                        phys_addr_t phys_idmap_start)
 277{
 278        /*
 279         * TODO
 280         * kvm_call_reset(boot_pgd_ptr, phys_idmap_start);
 281         */
 282}
 283
 284static inline int kvm_arch_dev_ioctl_check_extension(long ext)
 285{
 286        return 0;
 287}
 288
 289int kvm_perf_init(void);
 290int kvm_perf_teardown(void);
 291
 292void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 293
 294struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 295
 296static inline void kvm_arch_hardware_unsetup(void) {}
 297static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 298static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 299static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 300static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 301
 302static inline void kvm_arm_init_debug(void) {}
 303static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 304static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 305static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 306static inline int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 307                                             struct kvm_device_attr *attr)
 308{
 309        return -ENXIO;
 310}
 311static inline int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 312                                             struct kvm_device_attr *attr)
 313{
 314        return -ENXIO;
 315}
 316static inline int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 317                                             struct kvm_device_attr *attr)
 318{
 319        return -ENXIO;
 320}
 321
 322#endif /* __ARM_KVM_HOST_H__ */
 323