tools/testing/selftests/kvm/include/kvm_util.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * tools/testing/selftests/kvm/include/kvm_util.h
   4  *
   5  * Copyright (C) 2018, Google LLC.
   6  */
   7 #ifndef SELFTEST_KVM_UTIL_H
   8 #define SELFTEST_KVM_UTIL_H
   9
  10 #include "test_util.h"
  11
  12 #include "asm/kvm.h"
  13 #include "linux/list.h"
  14 #include "linux/kvm.h"
  15 #include <sys/ioctl.h>
  16
  17 #include "sparsebit.h"
  18
  19 #define KVM_DEV_PATH "/dev/kvm"
  20 #define KVM_MAX_VCPUS 512
  21
  22 /*
  23  * Callers of kvm_util only have an incomplete/opaque description of the
  24  * structure kvm_util is using to maintain the state of a VM.
  25  */
  26 struct kvm_vm;
  27
  28 typedef uint64_t vm_paddr_t; /* Virtual Machine (Guest) physical address */
  29 typedef uint64_t vm_vaddr_t; /* Virtual Machine (Guest) virtual address */
  30
  31 /* Minimum allocated guest virtual and physical addresses */
  32 #define KVM_UTIL_MIN_VADDR              0x2000
  33 #define KVM_GUEST_PAGE_TABLE_MIN_PADDR  0x180000
  34
  35 #define DEFAULT_GUEST_PHY_PAGES         512
  36 #define DEFAULT_GUEST_STACK_VADDR_MIN   0xab6000
  37 #define DEFAULT_STACK_PGS               5
  38
  39 enum vm_guest_mode {
  40         VM_MODE_P52V48_4K,
  41         VM_MODE_P52V48_64K,
  42         VM_MODE_P48V48_4K,
  43         VM_MODE_P48V48_64K,
  44         VM_MODE_P40V48_4K,
  45         VM_MODE_P40V48_64K,
  46         VM_MODE_PXXV48_4K,      /* For 48bits VA but ANY bits PA */
  47         VM_MODE_P47V64_4K,
  48         NUM_VM_MODES,
  49 };
  50
  51 #if defined(__aarch64__)
  52
  53 #define VM_MODE_DEFAULT                 VM_MODE_P40V48_4K
  54 #define MIN_PAGE_SHIFT                  12U
  55 #define ptes_per_page(page_size)        ((page_size) / 8)
  56
  57 #elif defined(__x86_64__)
  58
  59 #define VM_MODE_DEFAULT                 VM_MODE_PXXV48_4K
  60 #define MIN_PAGE_SHIFT                  12U
  61 #define ptes_per_page(page_size)        ((page_size) / 8)
  62
  63 #elif defined(__s390x__)
  64
  65 #define VM_MODE_DEFAULT                 VM_MODE_P47V64_4K
  66 #define MIN_PAGE_SHIFT                  12U
  67 #define ptes_per_page(page_size)        ((page_size) / 16)
  68
  69 #endif
  70
  71 #define MIN_PAGE_SIZE           (1U << MIN_PAGE_SHIFT)
  72 #define PTES_PER_MIN_PAGE       ptes_per_page(MIN_PAGE_SIZE)
  73
  74 struct vm_guest_mode_params {
  75         unsigned int pa_bits;
  76         unsigned int va_bits;
  77         unsigned int page_size;
  78         unsigned int page_shift;
  79 };
  80 extern const struct vm_guest_mode_params vm_guest_mode_params[];
  81
  82 int open_kvm_dev_path_or_exit(void);
  83 int kvm_check_cap(long cap);
  84 int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap);
  85 int vcpu_enable_cap(struct kvm_vm *vm, uint32_t vcpu_id,
  86                     struct kvm_enable_cap *cap);
  87 void vm_enable_dirty_ring(struct kvm_vm *vm, uint32_t ring_size);
  88 const char *vm_guest_mode_string(uint32_t i);
  89
  90 struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm);
  91 void kvm_vm_free(struct kvm_vm *vmp);
  92 void kvm_vm_restart(struct kvm_vm *vmp, int perm);
  93 void kvm_vm_release(struct kvm_vm *vmp);
  94 void kvm_vm_get_dirty_log(struct kvm_vm *vm, int slot, void *log);
  95 void kvm_vm_clear_dirty_log(struct kvm_vm *vm, int slot, void *log,
  96                             uint64_t first_page, uint32_t num_pages);
  97 uint32_t kvm_vm_reset_dirty_ring(struct kvm_vm *vm);
  98
  99 int kvm_memcmp_hva_gva(void *hva, struct kvm_vm *vm, const vm_vaddr_t gva,
 100                        size_t len);
 101
 102 void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename);
 103
 104 void vm_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent);
 105
 106 /*
 107  * VM VCPU Dump
 108  *
 109  * Input Args:
 110  *   stream - Output FILE stream
 111  *   vm     - Virtual Machine
 112  *   vcpuid - VCPU ID
 113  *   indent - Left margin indent amount
 114  *
 115  * Output Args: None
 116  *
 117  * Return: None
 118  *
 119  * Dumps the current state of the VCPU specified by @vcpuid, within the VM
 120  * given by @vm, to the FILE stream given by @stream.
 121  */
 122 void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid,
 123                uint8_t indent);
 124
 125 void vm_create_irqchip(struct kvm_vm *vm);
 126
 127 void vm_userspace_mem_region_add(struct kvm_vm *vm,
 128         enum vm_mem_backing_src_type src_type,
 129         uint64_t guest_paddr, uint32_t slot, uint64_t npages,
 130         uint32_t flags);
 131
 132 void vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long ioctl,
 133                 void *arg);
 134 int _vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long ioctl,
 135                 void *arg);
 136 void vm_ioctl(struct kvm_vm *vm, unsigned long ioctl, void *arg);
 137 int _vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg);
 138 void kvm_ioctl(struct kvm_vm *vm, unsigned long ioctl, void *arg);
 139 int _kvm_ioctl(struct kvm_vm *vm, unsigned long ioctl, void *arg);
 140 void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags);
 141 void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa);
 142 void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot);
 143 void vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid);
 144 vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min);
 145 vm_vaddr_t vm_vaddr_alloc_pages(struct kvm_vm *vm, int nr_pages);
 146 vm_vaddr_t vm_vaddr_alloc_page(struct kvm_vm *vm);
 147
 148 void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
 149               unsigned int npages);
 150 void *addr_gpa2hva(struct kvm_vm *vm, vm_paddr_t gpa);
 151 void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva);
 152 vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva);
 153 void *addr_gpa2alias(struct kvm_vm *vm, vm_paddr_t gpa);
 154
 155 /*
 156  * Address Guest Virtual to Guest Physical
 157  *
 158  * Input Args:
 159  *   vm - Virtual Machine
 160  *   gva - VM virtual address
 161  *
 162  * Output Args: None
 163  *
 164  * Return:
 165  *   Equivalent VM physical address
 166  *
 167  * Returns the VM physical address of the translated VM virtual
 168  * address given by @gva.
 169  */
 170 vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva);
 171
 172 struct kvm_run *vcpu_state(struct kvm_vm *vm, uint32_t vcpuid);
 173 void vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
 174 int _vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
 175 int vcpu_get_fd(struct kvm_vm *vm, uint32_t vcpuid);
 176 void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid);
 177 void vcpu_set_guest_debug(struct kvm_vm *vm, uint32_t vcpuid,
 178                           struct kvm_guest_debug *debug);
 179 void vcpu_set_mp_state(struct kvm_vm *vm, uint32_t vcpuid,
 180                        struct kvm_mp_state *mp_state);
 181 struct kvm_reg_list *vcpu_get_reg_list(struct kvm_vm *vm, uint32_t vcpuid);
 182 void vcpu_regs_get(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs);
 183 void vcpu_regs_set(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs);
 184
 185 /*
 186  * VM VCPU Args Set
 187  *
 188  * Input Args:
 189  *   vm - Virtual Machine
 190  *   vcpuid - VCPU ID
 191  *   num - number of arguments
 192  *   ... - arguments, each of type uint64_t
 193  *
 194  * Output Args: None
 195  *
 196  * Return: None
 197  *
 198  * Sets the first @num function input registers of the VCPU with @vcpuid,
 199  * per the C calling convention of the architecture, to the values given
 200  * as variable args. Each of the variable args is expected to be of type
 201  * uint64_t. The maximum @num can be is specific to the architecture.
 202  */
 203 void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...);
 204
 205 void vcpu_sregs_get(struct kvm_vm *vm, uint32_t vcpuid,
 206                     struct kvm_sregs *sregs);
 207 void vcpu_sregs_set(struct kvm_vm *vm, uint32_t vcpuid,
 208                     struct kvm_sregs *sregs);
 209 int _vcpu_sregs_set(struct kvm_vm *vm, uint32_t vcpuid,
 210                     struct kvm_sregs *sregs);
 211 void vcpu_fpu_get(struct kvm_vm *vm, uint32_t vcpuid,
 212                   struct kvm_fpu *fpu);
 213 void vcpu_fpu_set(struct kvm_vm *vm, uint32_t vcpuid,
 214                   struct kvm_fpu *fpu);
 215 void vcpu_get_reg(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_one_reg *reg);
 216 void vcpu_set_reg(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_one_reg *reg);
 217 #ifdef __KVM_HAVE_VCPU_EVENTS
 218 void vcpu_events_get(struct kvm_vm *vm, uint32_t vcpuid,
 219                      struct kvm_vcpu_events *events);
 220 void vcpu_events_set(struct kvm_vm *vm, uint32_t vcpuid,
 221                      struct kvm_vcpu_events *events);
 222 #endif
 223 #ifdef __x86_64__
 224 void vcpu_nested_state_get(struct kvm_vm *vm, uint32_t vcpuid,
 225                            struct kvm_nested_state *state);
 226 int vcpu_nested_state_set(struct kvm_vm *vm, uint32_t vcpuid,
 227                           struct kvm_nested_state *state, bool ignore_error);
 228 #endif
 229 void *vcpu_map_dirty_ring(struct kvm_vm *vm, uint32_t vcpuid);
 230
 231 int _kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr);
 232 int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr);
 233 int _kvm_create_device(struct kvm_vm *vm, uint64_t type, bool test, int *fd);
 234 int kvm_create_device(struct kvm_vm *vm, uint64_t type, bool test);
 235 int _kvm_device_access(int dev_fd, uint32_t group, uint64_t attr,
 236                        void *val, bool write);
 237 int kvm_device_access(int dev_fd, uint32_t group, uint64_t attr,
 238                       void *val, bool write);
 239
 240 const char *exit_reason_str(unsigned int exit_reason);
 241
 242 void virt_pgd_alloc(struct kvm_vm *vm);
 243
 244 /*
 245  * VM Virtual Page Map
 246  *
 247  * Input Args:
 248  *   vm - Virtual Machine
 249  *   vaddr - VM Virtual Address
 250  *   paddr - VM Physical Address
 251  *   memslot - Memory region slot for new virtual translation tables
 252  *
 253  * Output Args: None
 254  *
 255  * Return: None
 256  *
 257  * Within @vm, creates a virtual translation for the page starting
 258  * at @vaddr to the page starting at @paddr.
 259  */
 260 void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr);
 261
 262 vm_paddr_t vm_phy_page_alloc(struct kvm_vm *vm, vm_paddr_t paddr_min,
 263                              uint32_t memslot);
 264 vm_paddr_t vm_phy_pages_alloc(struct kvm_vm *vm, size_t num,
 265                               vm_paddr_t paddr_min, uint32_t memslot);
 266 vm_paddr_t vm_alloc_page_table(struct kvm_vm *vm);
 267
 268 /*
 269  * Create a VM with reasonable defaults
 270  *
 271  * Input Args:
 272  *   vcpuid - The id of the single VCPU to add to the VM.
 273  *   extra_mem_pages - The number of extra pages to add (this will
 274  *                     decide how much extra space we will need to
 275  *                     setup the page tables using memslot 0)
 276  *   guest_code - The vCPU's entry point
 277  *
 278  * Output Args: None
 279  *
 280  * Return:
 281  *   Pointer to opaque structure that describes the created VM.
 282  */
 283 struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages,
 284                                  void *guest_code);
 285
 286 /* Same as vm_create_default, but can be used for more than one vcpu */
 287 struct kvm_vm *vm_create_default_with_vcpus(uint32_t nr_vcpus, uint64_t extra_mem_pages,
 288                                             uint32_t num_percpu_pages, void *guest_code,
 289                                             uint32_t vcpuids[]);
 290
 291 /* Like vm_create_default_with_vcpus, but accepts mode and slot0 memory as a parameter */
 292 struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
 293                                     uint64_t slot0_mem_pages, uint64_t extra_mem_pages,
 294                                     uint32_t num_percpu_pages, void *guest_code,
 295                                     uint32_t vcpuids[]);
 296
 297 /*
 298  * Adds a vCPU with reasonable defaults (e.g. a stack)
 299  *
 300  * Input Args:
 301  *   vm - Virtual Machine
 302  *   vcpuid - The id of the VCPU to add to the VM.
 303  *   guest_code - The vCPU's entry point
 304  */
 305 void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code);
 306
 307 bool vm_is_unrestricted_guest(struct kvm_vm *vm);
 308
 309 unsigned int vm_get_page_size(struct kvm_vm *vm);
 310 unsigned int vm_get_page_shift(struct kvm_vm *vm);
 311 uint64_t vm_get_max_gfn(struct kvm_vm *vm);
 312 int vm_get_fd(struct kvm_vm *vm);
 313
 314 unsigned int vm_calc_num_guest_pages(enum vm_guest_mode mode, size_t size);
 315 unsigned int vm_num_host_pages(enum vm_guest_mode mode, unsigned int num_guest_pages);
 316 unsigned int vm_num_guest_pages(enum vm_guest_mode mode, unsigned int num_host_pages);
 317 static inline unsigned int
 318 vm_adjust_num_guest_pages(enum vm_guest_mode mode, unsigned int num_guest_pages)
 319 {
 320         unsigned int n;
 321         n = vm_num_guest_pages(mode, vm_num_host_pages(mode, num_guest_pages));
 322 #ifdef __s390x__
 323         /* s390 requires 1M aligned guest sizes */
 324         n = (n + 255) & ~255;
 325 #endif
 326         return n;
 327 }
 328
 329 struct kvm_userspace_memory_region *
 330 kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start,
 331                                  uint64_t end);
 332
 333 struct kvm_dirty_log *
 334 allocate_kvm_dirty_log(struct kvm_userspace_memory_region *region);
 335
 336 int vm_create_device(struct kvm_vm *vm, struct kvm_create_device *cd);
 337
 338 #define sync_global_to_guest(vm, g) ({                          \
 339         typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g));     \
 340         memcpy(_p, &(g), sizeof(g));                            \
 341 })
 342
 343 #define sync_global_from_guest(vm, g) ({                        \
 344         typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g));     \
 345         memcpy(&(g), _p, sizeof(g));                            \
 346 })
 347
 348 void assert_on_unhandled_exception(struct kvm_vm *vm, uint32_t vcpuid);
 349
 350 /* Common ucalls */
 351 enum {
 352         UCALL_NONE,
 353         UCALL_SYNC,
 354         UCALL_ABORT,
 355         UCALL_DONE,
 356 };
 357
 358 #define UCALL_MAX_ARGS 6
 359
 360 struct ucall {
 361         uint64_t cmd;
 362         uint64_t args[UCALL_MAX_ARGS];
 363 };
 364
 365 void ucall_init(struct kvm_vm *vm, void *arg);
 366 void ucall_uninit(struct kvm_vm *vm);
 367 void ucall(uint64_t cmd, int nargs, ...);
 368 uint64_t get_ucall(struct kvm_vm *vm, uint32_t vcpu_id, struct ucall *uc);
 369
 370 #define GUEST_SYNC_ARGS(stage, arg1, arg2, arg3, arg4)  \
 371                                 ucall(UCALL_SYNC, 6, "hello", stage, arg1, arg2, arg3, arg4)
 372 #define GUEST_SYNC(stage)       ucall(UCALL_SYNC, 2, "hello", stage)
 373 #define GUEST_DONE()            ucall(UCALL_DONE, 0)
 374 #define __GUEST_ASSERT(_condition, _nargs, _args...) do {       \
 375         if (!(_condition))                                      \
 376                 ucall(UCALL_ABORT, 2 + _nargs,                  \
 377                         "Failed guest assert: "                 \
 378                         #_condition, __LINE__, _args);          \
 379 } while (0)
 380
 381 #define GUEST_ASSERT(_condition) \
 382         __GUEST_ASSERT((_condition), 0, 0)
 383
 384 #define GUEST_ASSERT_1(_condition, arg1) \
 385         __GUEST_ASSERT((_condition), 1, (arg1))
 386
 387 #define GUEST_ASSERT_2(_condition, arg1, arg2) \
 388         __GUEST_ASSERT((_condition), 2, (arg1), (arg2))
 389
 390 #define GUEST_ASSERT_3(_condition, arg1, arg2, arg3) \
 391         __GUEST_ASSERT((_condition), 3, (arg1), (arg2), (arg3))
 392
 393 #define GUEST_ASSERT_4(_condition, arg1, arg2, arg3, arg4) \
 394         __GUEST_ASSERT((_condition), 4, (arg1), (arg2), (arg3), (arg4))
 395
 396 int vm_get_stats_fd(struct kvm_vm *vm);
 397 int vcpu_get_stats_fd(struct kvm_vm *vm, uint32_t vcpuid);
 398
 399 #endif /* SELFTEST_KVM_UTIL_H */