tools/testing/selftests/kvm/aarch64/page_fault_test.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * page_fault_test.c - Test stage 2 faults.
   4  *
   5  * This test tries different combinations of guest accesses (e.g., write,
   6  * S1PTW), backing source type (e.g., anon) and types of faults (e.g., read on
   7  * hugetlbfs with a hole). It checks that the expected handling method is
   8  * called (e.g., uffd faults with the right address and write/read flag).
   9  */
  10
  11 #define _GNU_SOURCE
  12 #include <linux/bitmap.h>
  13 #include <fcntl.h>
  14 #include <test_util.h>
  15 #include <kvm_util.h>
  16 #include <processor.h>
  17 #include <asm/sysreg.h>
  18 #include <linux/bitfield.h>
  19 #include "guest_modes.h"
  20 #include "userfaultfd_util.h"
  21
  22 /* Guest virtual addresses that point to the test page and its PTE. */
  23 #define TEST_GVA                                0xc0000000
  24 #define TEST_EXEC_GVA                           (TEST_GVA + 0x8)
  25 #define TEST_PTE_GVA                            0xb0000000
  26 #define TEST_DATA                               0x0123456789ABCDEF
  27
  28 static uint64_t *guest_test_memory = (uint64_t *)TEST_GVA;
  29
  30 #define CMD_NONE                                (0)
  31 #define CMD_SKIP_TEST                           (1ULL << 1)
  32 #define CMD_HOLE_PT                             (1ULL << 2)
  33 #define CMD_HOLE_DATA                           (1ULL << 3)
  34 #define CMD_CHECK_WRITE_IN_DIRTY_LOG            (1ULL << 4)
  35 #define CMD_CHECK_S1PTW_WR_IN_DIRTY_LOG         (1ULL << 5)
  36 #define CMD_CHECK_NO_WRITE_IN_DIRTY_LOG         (1ULL << 6)
  37 #define CMD_CHECK_NO_S1PTW_WR_IN_DIRTY_LOG      (1ULL << 7)
  38 #define CMD_SET_PTE_AF                          (1ULL << 8)
  39
  40 #define PREPARE_FN_NR                           10
  41 #define CHECK_FN_NR                             10
  42
  43 static struct event_cnt {
  44         int mmio_exits;
  45         int fail_vcpu_runs;
  46         int uffd_faults;
  47         /* uffd_faults is incremented from multiple threads. */
  48         pthread_mutex_t uffd_faults_mutex;
  49 } events;
  50
  51 struct test_desc {
  52         const char *name;
  53         uint64_t mem_mark_cmd;
  54         /* Skip the test if any prepare function returns false */
  55         bool (*guest_prepare[PREPARE_FN_NR])(void);
  56         void (*guest_test)(void);
  57         void (*guest_test_check[CHECK_FN_NR])(void);
  58         uffd_handler_t uffd_pt_handler;
  59         uffd_handler_t uffd_data_handler;
  60         void (*dabt_handler)(struct ex_regs *regs);
  61         void (*iabt_handler)(struct ex_regs *regs);
  62         void (*mmio_handler)(struct kvm_vm *vm, struct kvm_run *run);
  63         void (*fail_vcpu_run_handler)(int ret);
  64         uint32_t pt_memslot_flags;
  65         uint32_t data_memslot_flags;
  66         bool skip;
  67         struct event_cnt expected_events;
  68 };
  69
  70 struct test_params {
  71         enum vm_mem_backing_src_type src_type;
  72         struct test_desc *test_desc;
  73 };
  74
  75 static inline void flush_tlb_page(uint64_t vaddr)
  76 {
  77         uint64_t page = vaddr >> 12;
  78
  79         dsb(ishst);
  80         asm volatile("tlbi vaae1is, %0" :: "r" (page));
  81         dsb(ish);
  82         isb();
  83 }
  84
  85 static void guest_write64(void)
  86 {
  87         uint64_t val;
  88
  89         WRITE_ONCE(*guest_test_memory, TEST_DATA);
  90         val = READ_ONCE(*guest_test_memory);
  91         GUEST_ASSERT_EQ(val, TEST_DATA);
  92 }
  93
  94 /* Check the system for atomic instructions. */
  95 static bool guest_check_lse(void)
  96 {
  97         uint64_t isar0 = read_sysreg(id_aa64isar0_el1);
  98         uint64_t atomic;
  99
 100         atomic = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64ISAR0_ATOMICS), isar0);
 101         return atomic >= 2;
 102 }
 103
 104 static bool guest_check_dc_zva(void)
 105 {
 106         uint64_t dczid = read_sysreg(dczid_el0);
 107         uint64_t dzp = FIELD_GET(ARM64_FEATURE_MASK(DCZID_DZP), dczid);
 108
 109         return dzp == 0;
 110 }
 111
 112 /* Compare and swap instruction. */
 113 static void guest_cas(void)
 114 {
 115         uint64_t val;
 116
 117         GUEST_ASSERT(guest_check_lse());
 118         asm volatile(".arch_extension lse\n"
 119                      "casal %0, %1, [%2]\n"
 120                      :: "r" (0ul), "r" (TEST_DATA), "r" (guest_test_memory));
 121         val = READ_ONCE(*guest_test_memory);
 122         GUEST_ASSERT_EQ(val, TEST_DATA);
 123 }
 124
 125 static void guest_read64(void)
 126 {
 127         uint64_t val;
 128
 129         val = READ_ONCE(*guest_test_memory);
 130         GUEST_ASSERT_EQ(val, 0);
 131 }
 132
 133 /* Address translation instruction */
 134 static void guest_at(void)
 135 {
 136         uint64_t par;
 137
 138         asm volatile("at s1e1r, %0" :: "r" (guest_test_memory));
 139         par = read_sysreg(par_el1);
 140         isb();
 141
 142         /* Bit 1 indicates whether the AT was successful */
 143         GUEST_ASSERT_EQ(par & 1, 0);
 144 }
 145
 146 /*
 147  * The size of the block written by "dc zva" is guaranteed to be between (2 <<
 148  * 0) and (2 << 9), which is safe in our case as we need the write to happen
 149  * for at least a word, and not more than a page.
 150  */
 151 static void guest_dc_zva(void)
 152 {
 153         uint16_t val;
 154
 155         asm volatile("dc zva, %0" :: "r" (guest_test_memory));
 156         dsb(ish);
 157         val = READ_ONCE(*guest_test_memory);
 158         GUEST_ASSERT_EQ(val, 0);
 159 }
 160
 161 /*
 162  * Pre-indexing loads and stores don't have a valid syndrome (ESR_EL2.ISV==0).
 163  * And that's special because KVM must take special care with those: they
 164  * should still count as accesses for dirty logging or user-faulting, but
 165  * should be handled differently on mmio.
 166  */
 167 static void guest_ld_preidx(void)
 168 {
 169         uint64_t val;
 170         uint64_t addr = TEST_GVA - 8;
 171
 172         /*
 173          * This ends up accessing "TEST_GVA + 8 - 8", where "TEST_GVA - 8" is
 174          * in a gap between memslots not backing by anything.
 175          */
 176         asm volatile("ldr %0, [%1, #8]!"
 177                      : "=r" (val), "+r" (addr));
 178         GUEST_ASSERT_EQ(val, 0);
 179         GUEST_ASSERT_EQ(addr, TEST_GVA);
 180 }
 181
 182 static void guest_st_preidx(void)
 183 {
 184         uint64_t val = TEST_DATA;
 185         uint64_t addr = TEST_GVA - 8;
 186
 187         asm volatile("str %0, [%1, #8]!"
 188                      : "+r" (val), "+r" (addr));
 189
 190         GUEST_ASSERT_EQ(addr, TEST_GVA);
 191         val = READ_ONCE(*guest_test_memory);
 192 }
 193
 194 static bool guest_set_ha(void)
 195 {
 196         uint64_t mmfr1 = read_sysreg(id_aa64mmfr1_el1);
 197         uint64_t hadbs, tcr;
 198
 199         /* Skip if HA is not supported. */
 200         hadbs = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR1_HADBS), mmfr1);
 201         if (hadbs == 0)
 202                 return false;
 203
 204         tcr = read_sysreg(tcr_el1) | TCR_EL1_HA;
 205         write_sysreg(tcr, tcr_el1);
 206         isb();
 207
 208         return true;
 209 }
 210
 211 static bool guest_clear_pte_af(void)
 212 {
 213         *((uint64_t *)TEST_PTE_GVA) &= ~PTE_AF;
 214         flush_tlb_page(TEST_GVA);
 215
 216         return true;
 217 }
 218
 219 static void guest_check_pte_af(void)
 220 {
 221         dsb(ish);
 222         GUEST_ASSERT_EQ(*((uint64_t *)TEST_PTE_GVA) & PTE_AF, PTE_AF);
 223 }
 224
 225 static void guest_check_write_in_dirty_log(void)
 226 {
 227         GUEST_SYNC(CMD_CHECK_WRITE_IN_DIRTY_LOG);
 228 }
 229
 230 static void guest_check_no_write_in_dirty_log(void)
 231 {
 232         GUEST_SYNC(CMD_CHECK_NO_WRITE_IN_DIRTY_LOG);
 233 }
 234
 235 static void guest_check_s1ptw_wr_in_dirty_log(void)
 236 {
 237         GUEST_SYNC(CMD_CHECK_S1PTW_WR_IN_DIRTY_LOG);
 238 }
 239
 240 static void guest_check_no_s1ptw_wr_in_dirty_log(void)
 241 {
 242         GUEST_SYNC(CMD_CHECK_NO_S1PTW_WR_IN_DIRTY_LOG);
 243 }
 244
 245 static void guest_exec(void)
 246 {
 247         int (*code)(void) = (int (*)(void))TEST_EXEC_GVA;
 248         int ret;
 249
 250         ret = code();
 251         GUEST_ASSERT_EQ(ret, 0x77);
 252 }
 253
 254 static bool guest_prepare(struct test_desc *test)
 255 {
 256         bool (*prepare_fn)(void);
 257         int i;
 258
 259         for (i = 0; i < PREPARE_FN_NR; i++) {
 260                 prepare_fn = test->guest_prepare[i];
 261                 if (prepare_fn && !prepare_fn())
 262                         return false;
 263         }
 264
 265         return true;
 266 }
 267
 268 static void guest_test_check(struct test_desc *test)
 269 {
 270         void (*check_fn)(void);
 271         int i;
 272
 273         for (i = 0; i < CHECK_FN_NR; i++) {
 274                 check_fn = test->guest_test_check[i];
 275                 if (check_fn)
 276                         check_fn();
 277         }
 278 }
 279
 280 static void guest_code(struct test_desc *test)
 281 {
 282         if (!guest_prepare(test))
 283                 GUEST_SYNC(CMD_SKIP_TEST);
 284
 285         GUEST_SYNC(test->mem_mark_cmd);
 286
 287         if (test->guest_test)
 288                 test->guest_test();
 289
 290         guest_test_check(test);
 291         GUEST_DONE();
 292 }
 293
 294 static void no_dabt_handler(struct ex_regs *regs)
 295 {
 296         GUEST_ASSERT_1(false, read_sysreg(far_el1));
 297 }
 298
 299 static void no_iabt_handler(struct ex_regs *regs)
 300 {
 301         GUEST_ASSERT_1(false, regs->pc);
 302 }
 303
 304 static struct uffd_args {
 305         char *copy;
 306         void *hva;
 307         uint64_t paging_size;
 308 } pt_args, data_args;
 309
 310 /* Returns true to continue the test, and false if it should be skipped. */
 311 static int uffd_generic_handler(int uffd_mode, int uffd, struct uffd_msg *msg,
 312                                 struct uffd_args *args)
 313 {
 314         uint64_t addr = msg->arg.pagefault.address;
 315         uint64_t flags = msg->arg.pagefault.flags;
 316         struct uffdio_copy copy;
 317         int ret;
 318
 319         TEST_ASSERT(uffd_mode == UFFDIO_REGISTER_MODE_MISSING,
 320                     "The only expected UFFD mode is MISSING");
 321         ASSERT_EQ(addr, (uint64_t)args->hva);
 322
 323         pr_debug("uffd fault: addr=%p write=%d\n",
 324                  (void *)addr, !!(flags & UFFD_PAGEFAULT_FLAG_WRITE));
 325
 326         copy.src = (uint64_t)args->copy;
 327         copy.dst = addr;
 328         copy.len = args->paging_size;
 329         copy.mode = 0;
 330
 331         ret = ioctl(uffd, UFFDIO_COPY, &copy);
 332         if (ret == -1) {
 333                 pr_info("Failed UFFDIO_COPY in 0x%lx with errno: %d\n",
 334                         addr, errno);
 335                 return ret;
 336         }
 337
 338         pthread_mutex_lock(&events.uffd_faults_mutex);
 339         events.uffd_faults += 1;
 340         pthread_mutex_unlock(&events.uffd_faults_mutex);
 341         return 0;
 342 }
 343
 344 static int uffd_pt_handler(int mode, int uffd, struct uffd_msg *msg)
 345 {
 346         return uffd_generic_handler(mode, uffd, msg, &pt_args);
 347 }
 348
 349 static int uffd_data_handler(int mode, int uffd, struct uffd_msg *msg)
 350 {
 351         return uffd_generic_handler(mode, uffd, msg, &data_args);
 352 }
 353
 354 static void setup_uffd_args(struct userspace_mem_region *region,
 355                             struct uffd_args *args)
 356 {
 357         args->hva = (void *)region->region.userspace_addr;
 358         args->paging_size = region->region.memory_size;
 359
 360         args->copy = malloc(args->paging_size);
 361         TEST_ASSERT(args->copy, "Failed to allocate data copy.");
 362         memcpy(args->copy, args->hva, args->paging_size);
 363 }
 364
 365 static void setup_uffd(struct kvm_vm *vm, struct test_params *p,
 366                        struct uffd_desc **pt_uffd, struct uffd_desc **data_uffd)
 367 {
 368         struct test_desc *test = p->test_desc;
 369         int uffd_mode = UFFDIO_REGISTER_MODE_MISSING;
 370
 371         setup_uffd_args(vm_get_mem_region(vm, MEM_REGION_PT), &pt_args);
 372         setup_uffd_args(vm_get_mem_region(vm, MEM_REGION_TEST_DATA), &data_args);
 373
 374         *pt_uffd = NULL;
 375         if (test->uffd_pt_handler)
 376                 *pt_uffd = uffd_setup_demand_paging(uffd_mode, 0,
 377                                                     pt_args.hva,
 378                                                     pt_args.paging_size,
 379                                                     test->uffd_pt_handler);
 380
 381         *data_uffd = NULL;
 382         if (test->uffd_data_handler)
 383                 *data_uffd = uffd_setup_demand_paging(uffd_mode, 0,
 384                                                       data_args.hva,
 385                                                       data_args.paging_size,
 386                                                       test->uffd_data_handler);
 387 }
 388
 389 static void free_uffd(struct test_desc *test, struct uffd_desc *pt_uffd,
 390                       struct uffd_desc *data_uffd)
 391 {
 392         if (test->uffd_pt_handler)
 393                 uffd_stop_demand_paging(pt_uffd);
 394         if (test->uffd_data_handler)
 395                 uffd_stop_demand_paging(data_uffd);
 396
 397         free(pt_args.copy);
 398         free(data_args.copy);
 399 }
 400
 401 static int uffd_no_handler(int mode, int uffd, struct uffd_msg *msg)
 402 {
 403         TEST_FAIL("There was no UFFD fault expected.");
 404         return -1;
 405 }
 406
 407 /* Returns false if the test should be skipped. */
 408 static bool punch_hole_in_backing_store(struct kvm_vm *vm,
 409                                         struct userspace_mem_region *region)
 410 {
 411         void *hva = (void *)region->region.userspace_addr;
 412         uint64_t paging_size = region->region.memory_size;
 413         int ret, fd = region->fd;
 414
 415         if (fd != -1) {
 416                 ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
 417                                 0, paging_size);
 418                 TEST_ASSERT(ret == 0, "fallocate failed\n");
 419         } else {
 420                 ret = madvise(hva, paging_size, MADV_DONTNEED);
 421                 TEST_ASSERT(ret == 0, "madvise failed\n");
 422         }
 423
 424         return true;
 425 }
 426
 427 static void mmio_on_test_gpa_handler(struct kvm_vm *vm, struct kvm_run *run)
 428 {
 429         struct userspace_mem_region *region;
 430         void *hva;
 431
 432         region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA);
 433         hva = (void *)region->region.userspace_addr;
 434
 435         ASSERT_EQ(run->mmio.phys_addr, region->region.guest_phys_addr);
 436
 437         memcpy(hva, run->mmio.data, run->mmio.len);
 438         events.mmio_exits += 1;
 439 }
 440
 441 static void mmio_no_handler(struct kvm_vm *vm, struct kvm_run *run)
 442 {
 443         uint64_t data;
 444
 445         memcpy(&data, run->mmio.data, sizeof(data));
 446         pr_debug("addr=%lld len=%d w=%d data=%lx\n",
 447                  run->mmio.phys_addr, run->mmio.len,
 448                  run->mmio.is_write, data);
 449         TEST_FAIL("There was no MMIO exit expected.");
 450 }
 451
 452 static bool check_write_in_dirty_log(struct kvm_vm *vm,
 453                                      struct userspace_mem_region *region,
 454                                      uint64_t host_pg_nr)
 455 {
 456         unsigned long *bmap;
 457         bool first_page_dirty;
 458         uint64_t size = region->region.memory_size;
 459
 460         /* getpage_size() is not always equal to vm->page_size */
 461         bmap = bitmap_zalloc(size / getpagesize());
 462         kvm_vm_get_dirty_log(vm, region->region.slot, bmap);
 463         first_page_dirty = test_bit(host_pg_nr, bmap);
 464         free(bmap);
 465         return first_page_dirty;
 466 }
 467
 468 /* Returns true to continue the test, and false if it should be skipped. */
 469 static bool handle_cmd(struct kvm_vm *vm, int cmd)
 470 {
 471         struct userspace_mem_region *data_region, *pt_region;
 472         bool continue_test = true;
 473         uint64_t pte_gpa, pte_pg;
 474
 475         data_region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA);
 476         pt_region = vm_get_mem_region(vm, MEM_REGION_PT);
 477         pte_gpa = addr_hva2gpa(vm, virt_get_pte_hva(vm, TEST_GVA));
 478         pte_pg = (pte_gpa - pt_region->region.guest_phys_addr) / getpagesize();
 479
 480         if (cmd == CMD_SKIP_TEST)
 481                 continue_test = false;
 482
 483         if (cmd & CMD_HOLE_PT)
 484                 continue_test = punch_hole_in_backing_store(vm, pt_region);
 485         if (cmd & CMD_HOLE_DATA)
 486                 continue_test = punch_hole_in_backing_store(vm, data_region);
 487         if (cmd & CMD_CHECK_WRITE_IN_DIRTY_LOG)
 488                 TEST_ASSERT(check_write_in_dirty_log(vm, data_region, 0),
 489                             "Missing write in dirty log");
 490         if (cmd & CMD_CHECK_S1PTW_WR_IN_DIRTY_LOG)
 491                 TEST_ASSERT(check_write_in_dirty_log(vm, pt_region, pte_pg),
 492                             "Missing s1ptw write in dirty log");
 493         if (cmd & CMD_CHECK_NO_WRITE_IN_DIRTY_LOG)
 494                 TEST_ASSERT(!check_write_in_dirty_log(vm, data_region, 0),
 495                             "Unexpected write in dirty log");
 496         if (cmd & CMD_CHECK_NO_S1PTW_WR_IN_DIRTY_LOG)
 497                 TEST_ASSERT(!check_write_in_dirty_log(vm, pt_region, pte_pg),
 498                             "Unexpected s1ptw write in dirty log");
 499
 500         return continue_test;
 501 }
 502
 503 void fail_vcpu_run_no_handler(int ret)
 504 {
 505         TEST_FAIL("Unexpected vcpu run failure\n");
 506 }
 507
 508 void fail_vcpu_run_mmio_no_syndrome_handler(int ret)
 509 {
 510         TEST_ASSERT(errno == ENOSYS,
 511                     "The mmio handler should have returned not implemented.");
 512         events.fail_vcpu_runs += 1;
 513 }
 514
 515 typedef uint32_t aarch64_insn_t;
 516 extern aarch64_insn_t __exec_test[2];
 517
 518 noinline void __return_0x77(void)
 519 {
 520         asm volatile("__exec_test: mov x0, #0x77\n"
 521                      "ret\n");
 522 }
 523
 524 /*
 525  * Note that this function runs on the host before the test VM starts: there's
 526  * no need to sync the D$ and I$ caches.
 527  */
 528 static void load_exec_code_for_test(struct kvm_vm *vm)
 529 {
 530         uint64_t *code;
 531         struct userspace_mem_region *region;
 532         void *hva;
 533
 534         region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA);
 535         hva = (void *)region->region.userspace_addr;
 536
 537         assert(TEST_EXEC_GVA > TEST_GVA);
 538         code = hva + TEST_EXEC_GVA - TEST_GVA;
 539         memcpy(code, __exec_test, sizeof(__exec_test));
 540 }
 541
 542 static void setup_abort_handlers(struct kvm_vm *vm, struct kvm_vcpu *vcpu,
 543                                  struct test_desc *test)
 544 {
 545         vm_init_descriptor_tables(vm);
 546         vcpu_init_descriptor_tables(vcpu);
 547
 548         vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT,
 549                                 ESR_EC_DABT, no_dabt_handler);
 550         vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT,
 551                                 ESR_EC_IABT, no_iabt_handler);
 552 }
 553
 554 static void setup_gva_maps(struct kvm_vm *vm)
 555 {
 556         struct userspace_mem_region *region;
 557         uint64_t pte_gpa;
 558
 559         region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA);
 560         /* Map TEST_GVA first. This will install a new PTE. */
 561         virt_pg_map(vm, TEST_GVA, region->region.guest_phys_addr);
 562         /* Then map TEST_PTE_GVA to the above PTE. */
 563         pte_gpa = addr_hva2gpa(vm, virt_get_pte_hva(vm, TEST_GVA));
 564         virt_pg_map(vm, TEST_PTE_GVA, pte_gpa);
 565 }
 566
 567 enum pf_test_memslots {
 568         CODE_AND_DATA_MEMSLOT,
 569         PAGE_TABLE_MEMSLOT,
 570         TEST_DATA_MEMSLOT,
 571 };
 572
 573 /*
 574  * Create a memslot for code and data at pfn=0, and test-data and PT ones
 575  * at max_gfn.
 576  */
 577 static void setup_memslots(struct kvm_vm *vm, struct test_params *p)
 578 {
 579         uint64_t backing_src_pagesz = get_backing_src_pagesz(p->src_type);
 580         uint64_t guest_page_size = vm->page_size;
 581         uint64_t max_gfn = vm_compute_max_gfn(vm);
 582         /* Enough for 2M of code when using 4K guest pages. */
 583         uint64_t code_npages = 512;
 584         uint64_t pt_size, data_size, data_gpa;
 585
 586         /*
 587          * This test requires 1 pgd, 2 pud, 4 pmd, and 6 pte pages when using
 588          * VM_MODE_P48V48_4K. Note that the .text takes ~1.6MBs.  That's 13
 589          * pages. VM_MODE_P48V48_4K is the mode with most PT pages; let's use
 590          * twice that just in case.
 591          */
 592         pt_size = 26 * guest_page_size;
 593
 594         /* memslot sizes and gpa's must be aligned to the backing page size */
 595         pt_size = align_up(pt_size, backing_src_pagesz);
 596         data_size = align_up(guest_page_size, backing_src_pagesz);
 597         data_gpa = (max_gfn * guest_page_size) - data_size;
 598         data_gpa = align_down(data_gpa, backing_src_pagesz);
 599
 600         vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, 0,
 601                                     CODE_AND_DATA_MEMSLOT, code_npages, 0);
 602         vm->memslots[MEM_REGION_CODE] = CODE_AND_DATA_MEMSLOT;
 603         vm->memslots[MEM_REGION_DATA] = CODE_AND_DATA_MEMSLOT;
 604
 605         vm_userspace_mem_region_add(vm, p->src_type, data_gpa - pt_size,
 606                                     PAGE_TABLE_MEMSLOT, pt_size / guest_page_size,
 607                                     p->test_desc->pt_memslot_flags);
 608         vm->memslots[MEM_REGION_PT] = PAGE_TABLE_MEMSLOT;
 609
 610         vm_userspace_mem_region_add(vm, p->src_type, data_gpa, TEST_DATA_MEMSLOT,
 611                                     data_size / guest_page_size,
 612                                     p->test_desc->data_memslot_flags);
 613         vm->memslots[MEM_REGION_TEST_DATA] = TEST_DATA_MEMSLOT;
 614 }
 615
 616 static void setup_ucall(struct kvm_vm *vm)
 617 {
 618         struct userspace_mem_region *region = vm_get_mem_region(vm, MEM_REGION_TEST_DATA);
 619
 620         ucall_init(vm, region->region.guest_phys_addr + region->region.memory_size);
 621 }
 622
 623 static void setup_default_handlers(struct test_desc *test)
 624 {
 625         if (!test->mmio_handler)
 626                 test->mmio_handler = mmio_no_handler;
 627
 628         if (!test->fail_vcpu_run_handler)
 629                 test->fail_vcpu_run_handler = fail_vcpu_run_no_handler;
 630 }
 631
 632 static void check_event_counts(struct test_desc *test)
 633 {
 634         ASSERT_EQ(test->expected_events.uffd_faults, events.uffd_faults);
 635         ASSERT_EQ(test->expected_events.mmio_exits, events.mmio_exits);
 636         ASSERT_EQ(test->expected_events.fail_vcpu_runs, events.fail_vcpu_runs);
 637 }
 638
 639 static void print_test_banner(enum vm_guest_mode mode, struct test_params *p)
 640 {
 641         struct test_desc *test = p->test_desc;
 642
 643         pr_debug("Test: %s\n", test->name);
 644         pr_debug("Testing guest mode: %s\n", vm_guest_mode_string(mode));
 645         pr_debug("Testing memory backing src type: %s\n",
 646                  vm_mem_backing_src_alias(p->src_type)->name);
 647 }
 648
 649 static void reset_event_counts(void)
 650 {
 651         memset(&events, 0, sizeof(events));
 652 }
 653
 654 /*
 655  * This function either succeeds, skips the test (after setting test->skip), or
 656  * fails with a TEST_FAIL that aborts all tests.
 657  */
 658 static void vcpu_run_loop(struct kvm_vm *vm, struct kvm_vcpu *vcpu,
 659                           struct test_desc *test)
 660 {
 661         struct kvm_run *run;
 662         struct ucall uc;
 663         int ret;
 664
 665         run = vcpu->run;
 666
 667         for (;;) {
 668                 ret = _vcpu_run(vcpu);
 669                 if (ret) {
 670                         test->fail_vcpu_run_handler(ret);
 671                         goto done;
 672                 }
 673
 674                 switch (get_ucall(vcpu, &uc)) {
 675                 case UCALL_SYNC:
 676                         if (!handle_cmd(vm, uc.args[1])) {
 677                                 test->skip = true;
 678                                 goto done;
 679                         }
 680                         break;
 681                 case UCALL_ABORT:
 682                         REPORT_GUEST_ASSERT_2(uc, "values: %#lx, %#lx");
 683                         break;
 684                 case UCALL_DONE:
 685                         goto done;
 686                 case UCALL_NONE:
 687                         if (run->exit_reason == KVM_EXIT_MMIO)
 688                                 test->mmio_handler(vm, run);
 689                         break;
 690                 default:
 691                         TEST_FAIL("Unknown ucall %lu", uc.cmd);
 692                 }
 693         }
 694
 695 done:
 696         pr_debug(test->skip ? "Skipped.\n" : "Done.\n");
 697 }
 698
 699 static void run_test(enum vm_guest_mode mode, void *arg)
 700 {
 701         struct test_params *p = (struct test_params *)arg;
 702         struct test_desc *test = p->test_desc;
 703         struct kvm_vm *vm;
 704         struct kvm_vcpu *vcpu;
 705         struct uffd_desc *pt_uffd, *data_uffd;
 706
 707         print_test_banner(mode, p);
 708
 709         vm = ____vm_create(mode);
 710         setup_memslots(vm, p);
 711         kvm_vm_elf_load(vm, program_invocation_name);
 712         setup_ucall(vm);
 713         vcpu = vm_vcpu_add(vm, 0, guest_code);
 714
 715         setup_gva_maps(vm);
 716
 717         reset_event_counts();
 718
 719         /*
 720          * Set some code in the data memslot for the guest to execute (only
 721          * applicable to the EXEC tests). This has to be done before
 722          * setup_uffd() as that function copies the memslot data for the uffd
 723          * handler.
 724          */
 725         load_exec_code_for_test(vm);
 726         setup_uffd(vm, p, &pt_uffd, &data_uffd);
 727         setup_abort_handlers(vm, vcpu, test);
 728         setup_default_handlers(test);
 729         vcpu_args_set(vcpu, 1, test);
 730
 731         vcpu_run_loop(vm, vcpu, test);
 732
 733         kvm_vm_free(vm);
 734         free_uffd(test, pt_uffd, data_uffd);
 735
 736         /*
 737          * Make sure we check the events after the uffd threads have exited,
 738          * which means they updated their respective event counters.
 739          */
 740         if (!test->skip)
 741                 check_event_counts(test);
 742 }
 743
 744 static void help(char *name)
 745 {
 746         puts("");
 747         printf("usage: %s [-h] [-s mem-type]\n", name);
 748         puts("");
 749         guest_modes_help();
 750         backing_src_help("-s");
 751         puts("");
 752 }
 753
 754 #define SNAME(s)                        #s
 755 #define SCAT2(a, b)                     SNAME(a ## _ ## b)
 756 #define SCAT3(a, b, c)                  SCAT2(a, SCAT2(b, c))
 757 #define SCAT4(a, b, c, d)               SCAT2(a, SCAT3(b, c, d))
 758
 759 #define _CHECK(_test)                   _CHECK_##_test
 760 #define _PREPARE(_test)                 _PREPARE_##_test
 761 #define _PREPARE_guest_read64           NULL
 762 #define _PREPARE_guest_ld_preidx        NULL
 763 #define _PREPARE_guest_write64          NULL
 764 #define _PREPARE_guest_st_preidx        NULL
 765 #define _PREPARE_guest_exec             NULL
 766 #define _PREPARE_guest_at               NULL
 767 #define _PREPARE_guest_dc_zva           guest_check_dc_zva
 768 #define _PREPARE_guest_cas              guest_check_lse
 769
 770 /* With or without access flag checks */
 771 #define _PREPARE_with_af                guest_set_ha, guest_clear_pte_af
 772 #define _PREPARE_no_af                  NULL
 773 #define _CHECK_with_af                  guest_check_pte_af
 774 #define _CHECK_no_af                    NULL
 775
 776 /* Performs an access and checks that no faults were triggered. */
 777 #define TEST_ACCESS(_access, _with_af, _mark_cmd)                               \
 778 {                                                                               \
 779         .name                   = SCAT3(_access, _with_af, #_mark_cmd),         \
 780         .guest_prepare          = { _PREPARE(_with_af),                         \
 781                                     _PREPARE(_access) },                        \
 782         .mem_mark_cmd           = _mark_cmd,                                    \
 783         .guest_test             = _access,                                      \
 784         .guest_test_check       = { _CHECK(_with_af) },                         \
 785         .expected_events        = { 0 },                                        \
 786 }
 787
 788 #define TEST_UFFD(_access, _with_af, _mark_cmd,                                 \
 789                   _uffd_data_handler, _uffd_pt_handler, _uffd_faults)           \
 790 {                                                                               \
 791         .name                   = SCAT4(uffd, _access, _with_af, #_mark_cmd),   \
 792         .guest_prepare          = { _PREPARE(_with_af),                         \
 793                                     _PREPARE(_access) },                        \
 794         .guest_test             = _access,                                      \
 795         .mem_mark_cmd           = _mark_cmd,                                    \
 796         .guest_test_check       = { _CHECK(_with_af) },                         \
 797         .uffd_data_handler      = _uffd_data_handler,                           \
 798         .uffd_pt_handler        = _uffd_pt_handler,                             \
 799         .expected_events        = { .uffd_faults = _uffd_faults, },             \
 800 }
 801
 802 #define TEST_DIRTY_LOG(_access, _with_af, _test_check, _pt_check)               \
 803 {                                                                               \
 804         .name                   = SCAT3(dirty_log, _access, _with_af),          \
 805         .data_memslot_flags     = KVM_MEM_LOG_DIRTY_PAGES,                      \
 806         .pt_memslot_flags       = KVM_MEM_LOG_DIRTY_PAGES,                      \
 807         .guest_prepare          = { _PREPARE(_with_af),                         \
 808                                     _PREPARE(_access) },                        \
 809         .guest_test             = _access,                                      \
 810         .guest_test_check       = { _CHECK(_with_af), _test_check, _pt_check }, \
 811         .expected_events        = { 0 },                                        \
 812 }
 813
 814 #define TEST_UFFD_AND_DIRTY_LOG(_access, _with_af, _uffd_data_handler,          \
 815                                 _uffd_faults, _test_check, _pt_check)           \
 816 {                                                                               \
 817         .name                   = SCAT3(uffd_and_dirty_log, _access, _with_af), \
 818         .data_memslot_flags     = KVM_MEM_LOG_DIRTY_PAGES,                      \
 819         .pt_memslot_flags       = KVM_MEM_LOG_DIRTY_PAGES,                      \
 820         .guest_prepare          = { _PREPARE(_with_af),                         \
 821                                     _PREPARE(_access) },                        \
 822         .guest_test             = _access,                                      \
 823         .mem_mark_cmd           = CMD_HOLE_DATA | CMD_HOLE_PT,                  \
 824         .guest_test_check       = { _CHECK(_with_af), _test_check, _pt_check }, \
 825         .uffd_data_handler      = _uffd_data_handler,                           \
 826         .uffd_pt_handler        = uffd_pt_handler,                              \
 827         .expected_events        = { .uffd_faults = _uffd_faults, },             \
 828 }
 829
 830 #define TEST_RO_MEMSLOT(_access, _mmio_handler, _mmio_exits)                    \
 831 {                                                                               \
 832         .name                   = SCAT2(ro_memslot, _access),                   \
 833         .data_memslot_flags     = KVM_MEM_READONLY,                             \
 834         .pt_memslot_flags       = KVM_MEM_READONLY,                             \
 835         .guest_prepare          = { _PREPARE(_access) },                        \
 836         .guest_test             = _access,                                      \
 837         .mmio_handler           = _mmio_handler,                                \
 838         .expected_events        = { .mmio_exits = _mmio_exits },                \
 839 }
 840
 841 #define TEST_RO_MEMSLOT_NO_SYNDROME(_access)                                    \
 842 {                                                                               \
 843         .name                   = SCAT2(ro_memslot_no_syndrome, _access),       \
 844         .data_memslot_flags     = KVM_MEM_READONLY,                             \
 845         .pt_memslot_flags       = KVM_MEM_READONLY,                             \
 846         .guest_test             = _access,                                      \
 847         .fail_vcpu_run_handler  = fail_vcpu_run_mmio_no_syndrome_handler,       \
 848         .expected_events        = { .fail_vcpu_runs = 1 },                      \
 849 }
 850
 851 #define TEST_RO_MEMSLOT_AND_DIRTY_LOG(_access, _mmio_handler, _mmio_exits,      \
 852                                       _test_check)                              \
 853 {                                                                               \
 854         .name                   = SCAT2(ro_memslot, _access),                   \
 855         .data_memslot_flags     = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES,   \
 856         .pt_memslot_flags       = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES,   \
 857         .guest_prepare          = { _PREPARE(_access) },                        \
 858         .guest_test             = _access,                                      \
 859         .guest_test_check       = { _test_check },                              \
 860         .mmio_handler           = _mmio_handler,                                \
 861         .expected_events        = { .mmio_exits = _mmio_exits},                 \
 862 }
 863
 864 #define TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(_access, _test_check)         \
 865 {                                                                               \
 866         .name                   = SCAT2(ro_memslot_no_syn_and_dlog, _access),   \
 867         .data_memslot_flags     = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES,   \
 868         .pt_memslot_flags       = KVM_MEM_READONLY | KVM_MEM_LOG_DIRTY_PAGES,   \
 869         .guest_test             = _access,                                      \
 870         .guest_test_check       = { _test_check },                              \
 871         .fail_vcpu_run_handler  = fail_vcpu_run_mmio_no_syndrome_handler,       \
 872         .expected_events        = { .fail_vcpu_runs = 1 },                      \
 873 }
 874
 875 #define TEST_RO_MEMSLOT_AND_UFFD(_access, _mmio_handler, _mmio_exits,           \
 876                                  _uffd_data_handler, _uffd_faults)              \
 877 {                                                                               \
 878         .name                   = SCAT2(ro_memslot_uffd, _access),              \
 879         .data_memslot_flags     = KVM_MEM_READONLY,                             \
 880         .pt_memslot_flags       = KVM_MEM_READONLY,                             \
 881         .mem_mark_cmd           = CMD_HOLE_DATA | CMD_HOLE_PT,                  \
 882         .guest_prepare          = { _PREPARE(_access) },                        \
 883         .guest_test             = _access,                                      \
 884         .uffd_data_handler      = _uffd_data_handler,                           \
 885         .uffd_pt_handler        = uffd_pt_handler,                              \
 886         .mmio_handler           = _mmio_handler,                                \
 887         .expected_events        = { .mmio_exits = _mmio_exits,                  \
 888                                     .uffd_faults = _uffd_faults },              \
 889 }
 890
 891 #define TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(_access, _uffd_data_handler,       \
 892                                              _uffd_faults)                      \
 893 {                                                                               \
 894         .name                   = SCAT2(ro_memslot_no_syndrome, _access),       \
 895         .data_memslot_flags     = KVM_MEM_READONLY,                             \
 896         .pt_memslot_flags       = KVM_MEM_READONLY,                             \
 897         .mem_mark_cmd           = CMD_HOLE_DATA | CMD_HOLE_PT,                  \
 898         .guest_test             = _access,                                      \
 899         .uffd_data_handler      = _uffd_data_handler,                           \
 900         .uffd_pt_handler        = uffd_pt_handler,                      \
 901         .fail_vcpu_run_handler  = fail_vcpu_run_mmio_no_syndrome_handler,       \
 902         .expected_events        = { .fail_vcpu_runs = 1,                        \
 903                                     .uffd_faults = _uffd_faults },              \
 904 }
 905
 906 static struct test_desc tests[] = {
 907
 908         /* Check that HW is setting the Access Flag (AF) (sanity checks). */
 909         TEST_ACCESS(guest_read64, with_af, CMD_NONE),
 910         TEST_ACCESS(guest_ld_preidx, with_af, CMD_NONE),
 911         TEST_ACCESS(guest_cas, with_af, CMD_NONE),
 912         TEST_ACCESS(guest_write64, with_af, CMD_NONE),
 913         TEST_ACCESS(guest_st_preidx, with_af, CMD_NONE),
 914         TEST_ACCESS(guest_dc_zva, with_af, CMD_NONE),
 915         TEST_ACCESS(guest_exec, with_af, CMD_NONE),
 916
 917         /*
 918          * Punch a hole in the data backing store, and then try multiple
 919          * accesses: reads should rturn zeroes, and writes should
 920          * re-populate the page. Moreover, the test also check that no
 921          * exception was generated in the guest.  Note that this
 922          * reading/writing behavior is the same as reading/writing a
 923          * punched page (with fallocate(FALLOC_FL_PUNCH_HOLE)) from
 924          * userspace.
 925          */
 926         TEST_ACCESS(guest_read64, no_af, CMD_HOLE_DATA),
 927         TEST_ACCESS(guest_cas, no_af, CMD_HOLE_DATA),
 928         TEST_ACCESS(guest_ld_preidx, no_af, CMD_HOLE_DATA),
 929         TEST_ACCESS(guest_write64, no_af, CMD_HOLE_DATA),
 930         TEST_ACCESS(guest_st_preidx, no_af, CMD_HOLE_DATA),
 931         TEST_ACCESS(guest_at, no_af, CMD_HOLE_DATA),
 932         TEST_ACCESS(guest_dc_zva, no_af, CMD_HOLE_DATA),
 933
 934         /*
 935          * Punch holes in the data and PT backing stores and mark them for
 936          * userfaultfd handling. This should result in 2 faults: the access
 937          * on the data backing store, and its respective S1 page table walk
 938          * (S1PTW).
 939          */
 940         TEST_UFFD(guest_read64, with_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 941                   uffd_data_handler, uffd_pt_handler, 2),
 942         TEST_UFFD(guest_read64, no_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 943                   uffd_data_handler, uffd_pt_handler, 2),
 944         TEST_UFFD(guest_cas, with_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 945                   uffd_data_handler, uffd_pt_handler, 2),
 946         /*
 947          * Can't test guest_at with_af as it's IMPDEF whether the AF is set.
 948          * The S1PTW fault should still be marked as a write.
 949          */
 950         TEST_UFFD(guest_at, no_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 951                   uffd_no_handler, uffd_pt_handler, 1),
 952         TEST_UFFD(guest_ld_preidx, with_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 953                   uffd_data_handler, uffd_pt_handler, 2),
 954         TEST_UFFD(guest_write64, with_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 955                   uffd_data_handler, uffd_pt_handler, 2),
 956         TEST_UFFD(guest_dc_zva, with_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 957                   uffd_data_handler, uffd_pt_handler, 2),
 958         TEST_UFFD(guest_st_preidx, with_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 959                   uffd_data_handler, uffd_pt_handler, 2),
 960         TEST_UFFD(guest_exec, with_af, CMD_HOLE_DATA | CMD_HOLE_PT,
 961                   uffd_data_handler, uffd_pt_handler, 2),
 962
 963         /*
 964          * Try accesses when the data and PT memory regions are both
 965          * tracked for dirty logging.
 966          */
 967         TEST_DIRTY_LOG(guest_read64, with_af, guest_check_no_write_in_dirty_log,
 968                        guest_check_s1ptw_wr_in_dirty_log),
 969         TEST_DIRTY_LOG(guest_read64, no_af, guest_check_no_write_in_dirty_log,
 970                        guest_check_no_s1ptw_wr_in_dirty_log),
 971         TEST_DIRTY_LOG(guest_ld_preidx, with_af,
 972                        guest_check_no_write_in_dirty_log,
 973                        guest_check_s1ptw_wr_in_dirty_log),
 974         TEST_DIRTY_LOG(guest_at, no_af, guest_check_no_write_in_dirty_log,
 975                        guest_check_no_s1ptw_wr_in_dirty_log),
 976         TEST_DIRTY_LOG(guest_exec, with_af, guest_check_no_write_in_dirty_log,
 977                        guest_check_s1ptw_wr_in_dirty_log),
 978         TEST_DIRTY_LOG(guest_write64, with_af, guest_check_write_in_dirty_log,
 979                        guest_check_s1ptw_wr_in_dirty_log),
 980         TEST_DIRTY_LOG(guest_cas, with_af, guest_check_write_in_dirty_log,
 981                        guest_check_s1ptw_wr_in_dirty_log),
 982         TEST_DIRTY_LOG(guest_dc_zva, with_af, guest_check_write_in_dirty_log,
 983                        guest_check_s1ptw_wr_in_dirty_log),
 984         TEST_DIRTY_LOG(guest_st_preidx, with_af, guest_check_write_in_dirty_log,
 985                        guest_check_s1ptw_wr_in_dirty_log),
 986
 987         /*
 988          * Access when the data and PT memory regions are both marked for
 989          * dirty logging and UFFD at the same time. The expected result is
 990          * that writes should mark the dirty log and trigger a userfaultfd
 991          * write fault.  Reads/execs should result in a read userfaultfd
 992          * fault, and nothing in the dirty log.  Any S1PTW should result in
 993          * a write in the dirty log and a userfaultfd write.
 994          */
 995         TEST_UFFD_AND_DIRTY_LOG(guest_read64, with_af,
 996                                 uffd_data_handler, 2,
 997                                 guest_check_no_write_in_dirty_log,
 998                                 guest_check_s1ptw_wr_in_dirty_log),
 999         TEST_UFFD_AND_DIRTY_LOG(guest_read64, no_af,
1000                                 uffd_data_handler, 2,
1001                                 guest_check_no_write_in_dirty_log,
1002                                 guest_check_no_s1ptw_wr_in_dirty_log),
1003         TEST_UFFD_AND_DIRTY_LOG(guest_ld_preidx, with_af,
1004                                 uffd_data_handler,
1005                                 2, guest_check_no_write_in_dirty_log,
1006                                 guest_check_s1ptw_wr_in_dirty_log),
1007         TEST_UFFD_AND_DIRTY_LOG(guest_at, with_af, uffd_no_handler, 1,
1008                                 guest_check_no_write_in_dirty_log,
1009                                 guest_check_s1ptw_wr_in_dirty_log),
1010         TEST_UFFD_AND_DIRTY_LOG(guest_exec, with_af,
1011                                 uffd_data_handler, 2,
1012                                 guest_check_no_write_in_dirty_log,
1013                                 guest_check_s1ptw_wr_in_dirty_log),
1014         TEST_UFFD_AND_DIRTY_LOG(guest_write64, with_af,
1015                                 uffd_data_handler,
1016                                 2, guest_check_write_in_dirty_log,
1017                                 guest_check_s1ptw_wr_in_dirty_log),
1018         TEST_UFFD_AND_DIRTY_LOG(guest_cas, with_af,
1019                                 uffd_data_handler, 2,
1020                                 guest_check_write_in_dirty_log,
1021                                 guest_check_s1ptw_wr_in_dirty_log),
1022         TEST_UFFD_AND_DIRTY_LOG(guest_dc_zva, with_af,
1023                                 uffd_data_handler,
1024                                 2, guest_check_write_in_dirty_log,
1025                                 guest_check_s1ptw_wr_in_dirty_log),
1026         TEST_UFFD_AND_DIRTY_LOG(guest_st_preidx, with_af,
1027                                 uffd_data_handler, 2,
1028                                 guest_check_write_in_dirty_log,
1029                                 guest_check_s1ptw_wr_in_dirty_log),
1030         /*
1031          * Access when both the PT and data regions are marked read-only
1032          * (with KVM_MEM_READONLY). Writes with a syndrome result in an
1033          * MMIO exit, writes with no syndrome (e.g., CAS) result in a
1034          * failed vcpu run, and reads/execs with and without syndroms do
1035          * not fault.
1036          */
1037         TEST_RO_MEMSLOT(guest_read64, 0, 0),
1038         TEST_RO_MEMSLOT(guest_ld_preidx, 0, 0),
1039         TEST_RO_MEMSLOT(guest_at, 0, 0),
1040         TEST_RO_MEMSLOT(guest_exec, 0, 0),
1041         TEST_RO_MEMSLOT(guest_write64, mmio_on_test_gpa_handler, 1),
1042         TEST_RO_MEMSLOT_NO_SYNDROME(guest_dc_zva),
1043         TEST_RO_MEMSLOT_NO_SYNDROME(guest_cas),
1044         TEST_RO_MEMSLOT_NO_SYNDROME(guest_st_preidx),
1045
1046         /*
1047          * The PT and data regions are both read-only and marked
1048          * for dirty logging at the same time. The expected result is that
1049          * for writes there should be no write in the dirty log. The
1050          * readonly handling is the same as if the memslot was not marked
1051          * for dirty logging: writes with a syndrome result in an MMIO
1052          * exit, and writes with no syndrome result in a failed vcpu run.
1053          */
1054         TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_read64, 0, 0,
1055                                       guest_check_no_write_in_dirty_log),
1056         TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_ld_preidx, 0, 0,
1057                                       guest_check_no_write_in_dirty_log),
1058         TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_at, 0, 0,
1059                                       guest_check_no_write_in_dirty_log),
1060         TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_exec, 0, 0,
1061                                       guest_check_no_write_in_dirty_log),
1062         TEST_RO_MEMSLOT_AND_DIRTY_LOG(guest_write64, mmio_on_test_gpa_handler,
1063                                       1, guest_check_no_write_in_dirty_log),
1064         TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_dc_zva,
1065                                                   guest_check_no_write_in_dirty_log),
1066         TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_cas,
1067                                                   guest_check_no_write_in_dirty_log),
1068         TEST_RO_MEMSLOT_NO_SYNDROME_AND_DIRTY_LOG(guest_st_preidx,
1069                                                   guest_check_no_write_in_dirty_log),
1070
1071         /*
1072          * The PT and data regions are both read-only and punched with
1073          * holes tracked with userfaultfd.  The expected result is the
1074          * union of both userfaultfd and read-only behaviors. For example,
1075          * write accesses result in a userfaultfd write fault and an MMIO
1076          * exit.  Writes with no syndrome result in a failed vcpu run and
1077          * no userfaultfd write fault. Reads result in userfaultfd getting
1078          * triggered.
1079          */
1080         TEST_RO_MEMSLOT_AND_UFFD(guest_read64, 0, 0, uffd_data_handler, 2),
1081         TEST_RO_MEMSLOT_AND_UFFD(guest_ld_preidx, 0, 0, uffd_data_handler, 2),
1082         TEST_RO_MEMSLOT_AND_UFFD(guest_at, 0, 0, uffd_no_handler, 1),
1083         TEST_RO_MEMSLOT_AND_UFFD(guest_exec, 0, 0, uffd_data_handler, 2),
1084         TEST_RO_MEMSLOT_AND_UFFD(guest_write64, mmio_on_test_gpa_handler, 1,
1085                                  uffd_data_handler, 2),
1086         TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_cas, uffd_data_handler, 2),
1087         TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_dc_zva, uffd_no_handler, 1),
1088         TEST_RO_MEMSLOT_NO_SYNDROME_AND_UFFD(guest_st_preidx, uffd_no_handler, 1),
1089
1090         { 0 }
1091 };
1092
1093 static void for_each_test_and_guest_mode(enum vm_mem_backing_src_type src_type)
1094 {
1095         struct test_desc *t;
1096
1097         for (t = &tests[0]; t->name; t++) {
1098                 if (t->skip)
1099                         continue;
1100
1101                 struct test_params p = {
1102                         .src_type = src_type,
1103                         .test_desc = t,
1104                 };
1105
1106                 for_each_guest_mode(run_test, &p);
1107         }
1108 }
1109
1110 int main(int argc, char *argv[])
1111 {
1112         enum vm_mem_backing_src_type src_type;
1113         int opt;
1114
1115         src_type = DEFAULT_VM_MEM_SRC;
1116
1117         while ((opt = getopt(argc, argv, "hm:s:")) != -1) {
1118                 switch (opt) {
1119                 case 'm':
1120                         guest_modes_cmdline(optarg);
1121                         break;
1122                 case 's':
1123                         src_type = parse_backing_src_type(optarg);
1124                         break;
1125                 case 'h':
1126                 default:
1127                         help(argv[0]);
1128                         exit(0);
1129                 }
1130         }
1131
1132         for_each_test_and_guest_mode(src_type);
1133         return 0;
1134 }