LXR linux/arch/arm/kvm/guest.c

   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#include <linux/errno.h>
  20#include <linux/err.h>
  21#include <linux/kvm_host.h>
  22#include <linux/module.h>
  23#include <linux/vmalloc.h>
  24#include <linux/fs.h>
  25#include <asm/cputype.h>
  26#include <asm/uaccess.h>
  27#include <asm/kvm.h>
  28#include <asm/kvm_emulate.h>
  29#include <asm/kvm_coproc.h>
  30
  31#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
  32#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
  33
  34struct kvm_stats_debugfs_item debugfs_entries[] = {
  35        VCPU_STAT(hvc_exit_stat),
  36        VCPU_STAT(wfe_exit_stat),
  37        VCPU_STAT(wfi_exit_stat),
  38        VCPU_STAT(mmio_exit_user),
  39        VCPU_STAT(mmio_exit_kernel),
  40        VCPU_STAT(exits),
  41        { NULL }
  42};
  43
  44int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
  45{
  46        return 0;
  47}
  48
  49static u64 core_reg_offset_from_id(u64 id)
  50{
  51        return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
  52}
  53
  54static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
  55{
  56        u32 __user *uaddr = (u32 __user *)(long)reg->addr;
  57        struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
  58        u64 off;
  59
  60        if (KVM_REG_SIZE(reg->id) != 4)
  61                return -ENOENT;
  62
  63        /* Our ID is an index into the kvm_regs struct. */
  64        off = core_reg_offset_from_id(reg->id);
  65        if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
  66                return -ENOENT;
  67
  68        return put_user(((u32 *)regs)[off], uaddr);
  69}
  70
  71static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
  72{
  73        u32 __user *uaddr = (u32 __user *)(long)reg->addr;
  74        struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
  75        u64 off, val;
  76
  77        if (KVM_REG_SIZE(reg->id) != 4)
  78                return -ENOENT;
  79
  80        /* Our ID is an index into the kvm_regs struct. */
  81        off = core_reg_offset_from_id(reg->id);
  82        if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
  83                return -ENOENT;
  84
  85        if (get_user(val, uaddr) != 0)
  86                return -EFAULT;
  87
  88        if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
  89                unsigned long mode = val & MODE_MASK;
  90                switch (mode) {
  91                case USR_MODE:
  92                case FIQ_MODE:
  93                case IRQ_MODE:
  94                case SVC_MODE:
  95                case ABT_MODE:
  96                case UND_MODE:
  97                        break;
  98                default:
  99                        return -EINVAL;
 100                }
 101        }
 102
 103        ((u32 *)regs)[off] = val;
 104        return 0;
 105}
 106
 107int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 108{
 109        return -EINVAL;
 110}
 111
 112int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 113{
 114        return -EINVAL;
 115}
 116
 117#define NUM_TIMER_REGS 3
 118
 119static bool is_timer_reg(u64 index)
 120{
 121        switch (index) {
 122        case KVM_REG_ARM_TIMER_CTL:
 123        case KVM_REG_ARM_TIMER_CNT:
 124        case KVM_REG_ARM_TIMER_CVAL:
 125                return true;
 126        }
 127        return false;
 128}
 129
 130static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
 131{
 132        if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
 133                return -EFAULT;
 134        uindices++;
 135        if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
 136                return -EFAULT;
 137        uindices++;
 138        if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
 139                return -EFAULT;
 140
 141        return 0;
 142}
 143
 144static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 145{
 146        void __user *uaddr = (void __user *)(long)reg->addr;
 147        u64 val;
 148        int ret;
 149
 150        ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
 151        if (ret != 0)
 152                return -EFAULT;
 153
 154        return kvm_arm_timer_set_reg(vcpu, reg->id, val);
 155}
 156
 157static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 158{
 159        void __user *uaddr = (void __user *)(long)reg->addr;
 160        u64 val;
 161
 162        val = kvm_arm_timer_get_reg(vcpu, reg->id);
 163        return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
 164}
 165
 166static unsigned long num_core_regs(void)
 167{
 168        return sizeof(struct kvm_regs) / sizeof(u32);
 169}
 170
 171/**
 172 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
 173 *
 174 * This is for all registers.
 175 */
 176unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
 177{
 178        return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
 179                + NUM_TIMER_REGS;
 180}
 181
 182/**
 183 * kvm_arm_copy_reg_indices - get indices of all registers.
 184 *
 185 * We do core registers right here, then we apppend coproc regs.
 186 */
 187int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
 188{
 189        unsigned int i;
 190        const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
 191        int ret;
 192
 193        for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
 194                if (put_user(core_reg | i, uindices))
 195                        return -EFAULT;
 196                uindices++;
 197        }
 198
 199        ret = copy_timer_indices(vcpu, uindices);
 200        if (ret)
 201                return ret;
 202        uindices += NUM_TIMER_REGS;
 203
 204        return kvm_arm_copy_coproc_indices(vcpu, uindices);
 205}
 206
 207int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 208{
 209        /* We currently use nothing arch-specific in upper 32 bits */
 210        if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
 211                return -EINVAL;
 212
 213        /* Register group 16 means we want a core register. */
 214        if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
 215                return get_core_reg(vcpu, reg);
 216
 217        if (is_timer_reg(reg->id))
 218                return get_timer_reg(vcpu, reg);
 219
 220        return kvm_arm_coproc_get_reg(vcpu, reg);
 221}
 222
 223int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 224{
 225        /* We currently use nothing arch-specific in upper 32 bits */
 226        if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
 227                return -EINVAL;
 228
 229        /* Register group 16 means we set a core register. */
 230        if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
 231                return set_core_reg(vcpu, reg);
 232
 233        if (is_timer_reg(reg->id))
 234                return set_timer_reg(vcpu, reg);
 235
 236        return kvm_arm_coproc_set_reg(vcpu, reg);
 237}
 238
 239int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 240                                  struct kvm_sregs *sregs)
 241{
 242        return -EINVAL;
 243}
 244
 245int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 246                                  struct kvm_sregs *sregs)
 247{
 248        return -EINVAL;
 249}
 250
 251int __attribute_const__ kvm_target_cpu(void)
 252{
 253        switch (read_cpuid_part()) {
 254        case ARM_CPU_PART_CORTEX_A7:
 255                return KVM_ARM_TARGET_CORTEX_A7;
 256        case ARM_CPU_PART_CORTEX_A15:
 257                return KVM_ARM_TARGET_CORTEX_A15;
 258        default:
 259                return -EINVAL;
 260        }
 261}
 262
 263int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
 264{
 265        int target = kvm_target_cpu();
 266
 267        if (target < 0)
 268                return -ENODEV;
 269
 270        memset(init, 0, sizeof(*init));
 271
 272        /*
 273         * For now, we don't return any features.
 274         * In future, we might use features to return target
 275         * specific features available for the preferred
 276         * target type.
 277         */
 278        init->target = (__u32)target;
 279
 280        return 0;
 281}
 282
 283int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 284{
 285        return -EINVAL;
 286}
 287
 288int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 289{
 290        return -EINVAL;
 291}
 292
 293int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 294                                  struct kvm_translation *tr)
 295{
 296        return -EINVAL;
 297}
 298
 299int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 300                                        struct kvm_guest_debug *dbg)
 301{
 302        return -EINVAL;
 303}
 304