root/arch/arm/kvm/guest.c

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DEFINITIONS

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