arch/arm/kvm/guest.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   4  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   5  */
   6
   7 #include <linux/errno.h>
   8 #include <linux/err.h>
   9 #include <linux/kvm_host.h>
  10 #include <linux/module.h>
  11 #include <linux/vmalloc.h>
  12 #include <linux/fs.h>
  13 #include <kvm/arm_psci.h>
  14 #include <asm/cputype.h>
  15 #include <linux/uaccess.h>
  16 #include <asm/kvm.h>
  17 #include <asm/kvm_emulate.h>
  18 #include <asm/kvm_coproc.h>
  19
  20 #define VM_STAT(x) { #x, offsetof(struct kvm, stat.x), KVM_STAT_VM }
  21 #define VCPU_STAT(x) { #x, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU }
  22
  23 struct kvm_stats_debugfs_item debugfs_entries[] = {
  24         VCPU_STAT(halt_successful_poll),
  25         VCPU_STAT(halt_attempted_poll),
  26         VCPU_STAT(halt_poll_invalid),
  27         VCPU_STAT(halt_wakeup),
  28         VCPU_STAT(hvc_exit_stat),
  29         VCPU_STAT(wfe_exit_stat),
  30         VCPU_STAT(wfi_exit_stat),
  31         VCPU_STAT(mmio_exit_user),
  32         VCPU_STAT(mmio_exit_kernel),
  33         VCPU_STAT(exits),
  34         { NULL }
  35 };
  36
  37 static u64 core_reg_offset_from_id(u64 id)
  38 {
  39         return id & ~(KVM_REG_ARCH_MASK | KVM_REG_SIZE_MASK | KVM_REG_ARM_CORE);
  40 }
  41
  42 static int get_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
  43 {
  44         u32 __user *uaddr = (u32 __user *)(long)reg->addr;
  45         struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
  46         u64 off;
  47
  48         if (KVM_REG_SIZE(reg->id) != 4)
  49                 return -ENOENT;
  50
  51         /* Our ID is an index into the kvm_regs struct. */
  52         off = core_reg_offset_from_id(reg->id);
  53         if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
  54                 return -ENOENT;
  55
  56         return put_user(((u32 *)regs)[off], uaddr);
  57 }
  58
  59 static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
  60 {
  61         u32 __user *uaddr = (u32 __user *)(long)reg->addr;
  62         struct kvm_regs *regs = &vcpu->arch.ctxt.gp_regs;
  63         u64 off, val;
  64
  65         if (KVM_REG_SIZE(reg->id) != 4)
  66                 return -ENOENT;
  67
  68         /* Our ID is an index into the kvm_regs struct. */
  69         off = core_reg_offset_from_id(reg->id);
  70         if (off >= sizeof(*regs) / KVM_REG_SIZE(reg->id))
  71                 return -ENOENT;
  72
  73         if (get_user(val, uaddr) != 0)
  74                 return -EFAULT;
  75
  76         if (off == KVM_REG_ARM_CORE_REG(usr_regs.ARM_cpsr)) {
  77                 unsigned long mode = val & MODE_MASK;
  78                 switch (mode) {
  79                 case USR_MODE:
  80                 case FIQ_MODE:
  81                 case IRQ_MODE:
  82                 case SVC_MODE:
  83                 case ABT_MODE:
  84                 case UND_MODE:
  85                         break;
  86                 default:
  87                         return -EINVAL;
  88                 }
  89         }
  90
  91         ((u32 *)regs)[off] = val;
  92         return 0;
  93 }
  94
  95 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
  96 {
  97         return -EINVAL;
  98 }
  99
 100 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 101 {
 102         return -EINVAL;
 103 }
 104
 105 #define NUM_TIMER_REGS 3
 106
 107 static bool is_timer_reg(u64 index)
 108 {
 109         switch (index) {
 110         case KVM_REG_ARM_TIMER_CTL:
 111         case KVM_REG_ARM_TIMER_CNT:
 112         case KVM_REG_ARM_TIMER_CVAL:
 113                 return true;
 114         }
 115         return false;
 116 }
 117
 118 static int copy_timer_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
 119 {
 120         if (put_user(KVM_REG_ARM_TIMER_CTL, uindices))
 121                 return -EFAULT;
 122         uindices++;
 123         if (put_user(KVM_REG_ARM_TIMER_CNT, uindices))
 124                 return -EFAULT;
 125         uindices++;
 126         if (put_user(KVM_REG_ARM_TIMER_CVAL, uindices))
 127                 return -EFAULT;
 128
 129         return 0;
 130 }
 131
 132 static int set_timer_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 133 {
 134         void __user *uaddr = (void __user *)(long)reg->addr;
 135         u64 val;
 136         int ret;
 137
 138         ret = copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id));
 139         if (ret != 0)
 140                 return -EFAULT;
 141
 142         return kvm_arm_timer_set_reg(vcpu, reg->id, val);
 143 }
 144
 145 static int get_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
 150         val = kvm_arm_timer_get_reg(vcpu, reg->id);
 151         return copy_to_user(uaddr, &val, KVM_REG_SIZE(reg->id)) ? -EFAULT : 0;
 152 }
 153
 154 static unsigned long num_core_regs(void)
 155 {
 156         return sizeof(struct kvm_regs) / sizeof(u32);
 157 }
 158
 159 /**
 160  * kvm_arm_num_regs - how many registers do we present via KVM_GET_ONE_REG
 161  *
 162  * This is for all registers.
 163  */
 164 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu)
 165 {
 166         return num_core_regs() + kvm_arm_num_coproc_regs(vcpu)
 167                 + kvm_arm_get_fw_num_regs(vcpu)
 168                 + NUM_TIMER_REGS;
 169 }
 170
 171 /**
 172  * kvm_arm_copy_reg_indices - get indices of all registers.
 173  *
 174  * We do core registers right here, then we append coproc regs.
 175  */
 176 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *uindices)
 177 {
 178         unsigned int i;
 179         const u64 core_reg = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_CORE;
 180         int ret;
 181
 182         for (i = 0; i < sizeof(struct kvm_regs)/sizeof(u32); i++) {
 183                 if (put_user(core_reg | i, uindices))
 184                         return -EFAULT;
 185                 uindices++;
 186         }
 187
 188         ret = kvm_arm_copy_fw_reg_indices(vcpu, uindices);
 189         if (ret)
 190                 return ret;
 191         uindices += kvm_arm_get_fw_num_regs(vcpu);
 192
 193         ret = copy_timer_indices(vcpu, uindices);
 194         if (ret)
 195                 return ret;
 196         uindices += NUM_TIMER_REGS;
 197
 198         return kvm_arm_copy_coproc_indices(vcpu, uindices);
 199 }
 200
 201 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 202 {
 203         /* We currently use nothing arch-specific in upper 32 bits */
 204         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
 205                 return -EINVAL;
 206
 207         /* Register group 16 means we want a core register. */
 208         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
 209                 return get_core_reg(vcpu, reg);
 210
 211         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
 212                 return kvm_arm_get_fw_reg(vcpu, reg);
 213
 214         if (is_timer_reg(reg->id))
 215                 return get_timer_reg(vcpu, reg);
 216
 217         return kvm_arm_coproc_get_reg(vcpu, reg);
 218 }
 219
 220 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 221 {
 222         /* We currently use nothing arch-specific in upper 32 bits */
 223         if ((reg->id & ~KVM_REG_SIZE_MASK) >> 32 != KVM_REG_ARM >> 32)
 224                 return -EINVAL;
 225
 226         /* Register group 16 means we set a core register. */
 227         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_CORE)
 228                 return set_core_reg(vcpu, reg);
 229
 230         if ((reg->id & KVM_REG_ARM_COPROC_MASK) == KVM_REG_ARM_FW)
 231                 return kvm_arm_set_fw_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
 239 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
 240                                   struct kvm_sregs *sregs)
 241 {
 242         return -EINVAL;
 243 }
 244
 245 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 246                                   struct kvm_sregs *sregs)
 247 {
 248         return -EINVAL;
 249 }
 250
 251
 252 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
 253                               struct kvm_vcpu_events *events)
 254 {
 255         events->exception.serror_pending = !!(*vcpu_hcr(vcpu) & HCR_VA);
 256
 257         /*
 258          * We never return a pending ext_dabt here because we deliver it to
 259          * the virtual CPU directly when setting the event and it's no longer
 260          * 'pending' at this point.
 261          */
 262
 263         return 0;
 264 }
 265
 266 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 267                               struct kvm_vcpu_events *events)
 268 {
 269         bool serror_pending = events->exception.serror_pending;
 270         bool has_esr = events->exception.serror_has_esr;
 271         bool ext_dabt_pending = events->exception.ext_dabt_pending;
 272
 273         if (serror_pending && has_esr)
 274                 return -EINVAL;
 275         else if (serror_pending)
 276                 kvm_inject_vabt(vcpu);
 277
 278         if (ext_dabt_pending)
 279                 kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu));
 280
 281         return 0;
 282 }
 283
 284 int __attribute_const__ kvm_target_cpu(void)
 285 {
 286         switch (read_cpuid_part()) {
 287         case ARM_CPU_PART_CORTEX_A7:
 288                 return KVM_ARM_TARGET_CORTEX_A7;
 289         case ARM_CPU_PART_CORTEX_A15:
 290                 return KVM_ARM_TARGET_CORTEX_A15;
 291         default:
 292                 return -EINVAL;
 293         }
 294 }
 295
 296 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
 297 {
 298         int target = kvm_target_cpu();
 299
 300         if (target < 0)
 301                 return -ENODEV;
 302
 303         memset(init, 0, sizeof(*init));
 304
 305         /*
 306          * For now, we don't return any features.
 307          * In future, we might use features to return target
 308          * specific features available for the preferred
 309          * target type.
 310          */
 311         init->target = (__u32)target;
 312
 313         return 0;
 314 }
 315
 316 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 317 {
 318         return -EINVAL;
 319 }
 320
 321 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 322 {
 323         return -EINVAL;
 324 }
 325
 326 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 327                                   struct kvm_translation *tr)
 328 {
 329         return -EINVAL;
 330 }
 331
 332 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
 333                                         struct kvm_guest_debug *dbg)
 334 {
 335         return -EINVAL;
 336 }
 337
 338 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 339                                struct kvm_device_attr *attr)
 340 {
 341         int ret;
 342
 343         switch (attr->group) {
 344         case KVM_ARM_VCPU_TIMER_CTRL:
 345                 ret = kvm_arm_timer_set_attr(vcpu, attr);
 346                 break;
 347         default:
 348                 ret = -ENXIO;
 349                 break;
 350         }
 351
 352         return ret;
 353 }
 354
 355 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 356                                struct kvm_device_attr *attr)
 357 {
 358         int ret;
 359
 360         switch (attr->group) {
 361         case KVM_ARM_VCPU_TIMER_CTRL:
 362                 ret = kvm_arm_timer_get_attr(vcpu, attr);
 363                 break;
 364         default:
 365                 ret = -ENXIO;
 366                 break;
 367         }
 368
 369         return ret;
 370 }
 371
 372 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 373                                struct kvm_device_attr *attr)
 374 {
 375         int ret;
 376
 377         switch (attr->group) {
 378         case KVM_ARM_VCPU_TIMER_CTRL:
 379                 ret = kvm_arm_timer_has_attr(vcpu, attr);
 380                 break;
 381         default:
 382                 ret = -ENXIO;
 383                 break;
 384         }
 385
 386         return ret;
 387 }