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 <kvm/arm_psci.h>
  26#include <asm/cputype.h>
  27#include <linux/uaccess.h>
  28#include <asm/kvm.h>
  29#include <asm/kvm_emulate.h>
  30#include <asm/kvm_coproc.h>
  31
  32#define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
  33#define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
  34
  35struct kvm_stats_debugfs_item debugfs_entries[] = {
  36        VCPU_STAT(hvc_exit_stat),
  37        VCPU_STAT(wfe_exit_stat),
  38        VCPU_STAT(wfi_exit_stat),
  39        VCPU_STAT(mmio_exit_user),
  40        VCPU_STAT(mmio_exit_kernel),
  41        VCPU_STAT(exits),
  42        { NULL }
  43};
  44
  45int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
  46{
  47        return 0;
  48}
  49
  50static u64 core_reg_offset_from_id(u64 id)
  51{
  52        return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
  53}
  54
  55static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
  56{
  57        u32 __user *uaddr = (u32 __user *)(long)reg->addr;
  58        struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
  59        u64 off;
  60
  61        if (KVM_REG_SIZE(reg->id) != 4)
  62                return -ENOENT;
  63
  64        /* Our ID is an index into the kvm_regs struct. */
  65        off = core_reg_offset_from_id(reg->id);
  66        if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
  67                return -ENOENT;
  68
  69        return put_user(((u32 *)regs)[off], uaddr);
  70}
  71
  72static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
  73{
  74        u32 __user *uaddr = (u32 __user *)(long)reg->addr;
  75        struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
  76        u64 off, val;
  77
  78        if (KVM_REG_SIZE(reg->id) != 4)
  79                return -ENOENT;
  80
  81        /* Our ID is an index into the kvm_regs struct. */
  82        off = core_reg_offset_from_id(reg->id);
  83        if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
  84                return -ENOENT;
  85
  86        if (get_user(val, uaddr) != 0)
  87                return -EFAULT;
  88
  89        if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
  90                unsigned long mode = val & MODE_MASK;
  91                switch (mode) {
  92                case USR_MODE:
  93                case FIQ_MODE:
  94                case IRQ_MODE:
  95                case SVC_MODE:
  96                case ABT_MODE:
  97                case UND_MODE:
  98                        break;
  99                default:
 100                        return -EINVAL;
 101                }
 102        }
 103
 104        ((u32 *)regs)[off] = val;
 105        return 0;
 106}
 107
 108int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 109{
 110        return -EINVAL;
 111}
 112
 113int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 114{
 115        return -EINVAL;
 116}
 117
 118#define NUM_TIMER_REGS 3
 119
 120static bool is_timer_reg(u64 index)
 121{
 122        switch (index) {
 123        case KVM_REG_ARM_TIMER_CTL:
 124        case KVM_REG_ARM_TIMER_CNT:
 125        case KVM_REG_ARM_TIMER_CVAL:
 126                return true;
 127        }
 128        return false;
 129}
 130
 131static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
 132{
 133        if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
 134                return -EFAULT;
 135        uindices++;
 136        if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
 137                return -EFAULT;
 138        uindices++;
 139        if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
 140                return -EFAULT;
 141
 142        return 0;
 143}
 144
 145static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 146{
 147        void __user *uaddr = (void __user *)(long)reg->addr;
 148        u64 val;
 149        int ret;
 150
 151        ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
 152        if (ret != 0)
 153                return -EFAULT;
 154
 155        return kvm_arm_timer_set_reg(vcpu, reg->id, val);
 156}
 157
 158static int get_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 159{
 160        void __user *uaddr = (void __user *)(long)reg->addr;
 161        u64 val;
 162
 163        val = kvm_arm_timer_get_reg(vcpu, reg->id);
 164        return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
 165}
 166
 167static unsigned long num_core_regs(void)
 168{
 169        return sizeof(struct kvm_regs) / sizeof(u32);
 170}
 171
 172/**
 173 * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
 174 *
 175 * This is for all registers.
 176 */
 177unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
 178{
 179        return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
 180                + kvm_arm_get_fw_num_regs(vcpu)
 181                + NUM_TIMER_REGS;
 182}
 183
 184/**
 185 * kvm_arm_copy_reg_indices - get indices of all registers.
 186 *
 187 * We do core registers right here, then we append coproc regs.
 188 */
 189int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
 190{
 191        unsigned int i;
 192        const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
 193        int ret;
 194
 195        for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
 196                if (put_user(core_reg | i, uindices))
 197                        return -EFAULT;
 198                uindices++;
 199        }
 200
 201        ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
 202        if (ret)
 203                return ret;
 204        uindices += kvm_arm_get_fw_num_regs(vcpu);
 205
 206        ret = copy_timer_indices(vcpu, uindices);
 207        if (ret)
 208                return ret;
 209        uindices += NUM_TIMER_REGS;
 210
 211        return kvm_arm_copy_coproc_indices(vcpu, uindices);
 212}
 213
 214int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 215{
 216        /* We currently use nothing arch-specific in upper 32 bits */
 217        if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
 218                return -EINVAL;
 219
 220        /* Register group 16 means we want a core register. */
 221        if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
 222                return get_core_reg(vcpu, reg);
 223
 224        if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
 225                return kvm_arm_get_fw_reg(vcpu, reg);
 226
 227        if (is_timer_reg(reg->id))
 228                return get_timer_reg(vcpu, reg);
 229
 230        return kvm_arm_coproc_get_reg(vcpu, reg);
 231}
 232
 233int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 234{
 235        /* We currently use nothing arch-specific in upper 32 bits */
 236        if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
 237                return -EINVAL;
 238
 239        /* Register group 16 means we set a core register. */
 240        if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
 241                return set_core_reg(vcpu, reg);
 242
 243        if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
 244                return kvm_arm_set_fw_reg(vcpu, reg);
 245
 246        if (is_timer_reg(reg->id))
 247                return set_timer_reg(vcpu, reg);
 248
 249        return kvm_arm_coproc_set_reg(vcpu, reg);
 250}
 251
 252int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 253                                  struct kvm_sregs *sregs)
 254{
 255        return -EINVAL;
 256}
 257
 258int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 259                                  struct kvm_sregs *sregs)
 260{
 261        return -EINVAL;
 262}
 263
 264
 265int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
 266                              struct kvm_vcpu_events *events)
 267{
 268        events->exception.serror_pending = !!(*vcpu_hcr(vcpu) & HCR_VA);
 269
 270        return 0;
 271}
 272
 273int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 274                              struct kvm_vcpu_events *events)
 275{
 276        bool serror_pending = events->exception.serror_pending;
 277        bool has_esr = events->exception.serror_has_esr;
 278
 279        if (serror_pending && has_esr)
 280                return -EINVAL;
 281        else if (serror_pending)
 282                kvm_inject_vabt(vcpu);
 283
 284        return 0;
 285}
 286
 287int __attribute_const__ kvm_target_cpu(void)
 288{
 289        switch (read_cpuid_part()) {
 290        case ARM_CPU_PART_CORTEX_A7:
 291                return KVM_ARM_TARGET_CORTEX_A7;
 292        case ARM_CPU_PART_CORTEX_A15:
 293                return KVM_ARM_TARGET_CORTEX_A15;
 294        default:
 295                return -EINVAL;
 296        }
 297}
 298
 299int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
 300{
 301        int target = kvm_target_cpu();
 302
 303        if (target < 0)
 304                return -ENODEV;
 305
 306        memset(init, 0, sizeof(*init));
 307
 308        /*
 309         * For now, we don't return any features.
 310         * In future, we might use features to return target
 311         * specific features available for the preferred
 312         * target type.
 313         */
 314        init->target = (__u32)target;
 315
 316        return 0;
 317}
 318
 319int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 320{
 321        return -EINVAL;
 322}
 323
 324int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 325{
 326        return -EINVAL;
 327}
 328
 329int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 330                                  struct kvm_translation *tr)
 331{
 332        return -EINVAL;
 333}
 334
 335int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 336                                        struct kvm_guest_debug *dbg)
 337{
 338        return -EINVAL;
 339}
 340
 341int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 342                               struct kvm_device_attr *attr)
 343{
 344        int ret;
 345
 346        switch (attr->group) {
 347        case KVM_ARM_VCPU_TIMER_CTRL:
 348                ret = kvm_arm_timer_set_attr(vcpu, attr);
 349                break;
 350        default:
 351                ret = -ENXIO;
 352                break;
 353        }
 354
 355        return ret;
 356}
 357
 358int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 359                               struct kvm_device_attr *attr)
 360{
 361        int ret;
 362
 363        switch (attr->group) {
 364        case KVM_ARM_VCPU_TIMER_CTRL:
 365                ret = kvm_arm_timer_get_attr(vcpu, attr);
 366                break;
 367        default:
 368                ret = -ENXIO;
 369                break;
 370        }
 371
 372        return ret;
 373}
 374
 375int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 376                               struct kvm_device_attr *attr)
 377{
 378        int ret;
 379
 380        switch (attr->group) {
 381        case KVM_ARM_VCPU_TIMER_CTRL:
 382                ret = kvm_arm_timer_has_attr(vcpu, attr);
 383                break;
 384        default:
 385                ret = -ENXIO;
 386                break;
 387        }
 388
 389        return ret;
 390}
 391