tools/testing/selftests/kvm/lib/x86_64/processor.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * tools/testing/selftests/kvm/lib/x86_64/processor.c
   4  *
   5  * Copyright (C) 2018, Google LLC.
   6  */
   7
   8 #include "test_util.h"
   9 #include "kvm_util.h"
  10 #include "processor.h"
  11
  12 #ifndef NUM_INTERRUPTS
  13 #define NUM_INTERRUPTS 256
  14 #endif
  15
  16 #define DEFAULT_CODE_SELECTOR 0x8
  17 #define DEFAULT_DATA_SELECTOR 0x10
  18
  19 #define MAX_NR_CPUID_ENTRIES 100
  20
  21 vm_vaddr_t exception_handlers;
  22 bool host_cpu_is_amd;
  23 bool host_cpu_is_intel;
  24
  25 static void regs_dump(FILE *stream, struct kvm_regs *regs, uint8_t indent)
  26 {
  27         fprintf(stream, "%*srax: 0x%.16llx rbx: 0x%.16llx "
  28                 "rcx: 0x%.16llx rdx: 0x%.16llx\n",
  29                 indent, "",
  30                 regs->rax, regs->rbx, regs->rcx, regs->rdx);
  31         fprintf(stream, "%*srsi: 0x%.16llx rdi: 0x%.16llx "
  32                 "rsp: 0x%.16llx rbp: 0x%.16llx\n",
  33                 indent, "",
  34                 regs->rsi, regs->rdi, regs->rsp, regs->rbp);
  35         fprintf(stream, "%*sr8:  0x%.16llx r9:  0x%.16llx "
  36                 "r10: 0x%.16llx r11: 0x%.16llx\n",
  37                 indent, "",
  38                 regs->r8, regs->r9, regs->r10, regs->r11);
  39         fprintf(stream, "%*sr12: 0x%.16llx r13: 0x%.16llx "
  40                 "r14: 0x%.16llx r15: 0x%.16llx\n",
  41                 indent, "",
  42                 regs->r12, regs->r13, regs->r14, regs->r15);
  43         fprintf(stream, "%*srip: 0x%.16llx rfl: 0x%.16llx\n",
  44                 indent, "",
  45                 regs->rip, regs->rflags);
  46 }
  47
  48 static void segment_dump(FILE *stream, struct kvm_segment *segment,
  49                          uint8_t indent)
  50 {
  51         fprintf(stream, "%*sbase: 0x%.16llx limit: 0x%.8x "
  52                 "selector: 0x%.4x type: 0x%.2x\n",
  53                 indent, "", segment->base, segment->limit,
  54                 segment->selector, segment->type);
  55         fprintf(stream, "%*spresent: 0x%.2x dpl: 0x%.2x "
  56                 "db: 0x%.2x s: 0x%.2x l: 0x%.2x\n",
  57                 indent, "", segment->present, segment->dpl,
  58                 segment->db, segment->s, segment->l);
  59         fprintf(stream, "%*sg: 0x%.2x avl: 0x%.2x "
  60                 "unusable: 0x%.2x padding: 0x%.2x\n",
  61                 indent, "", segment->g, segment->avl,
  62                 segment->unusable, segment->padding);
  63 }
  64
  65 static void dtable_dump(FILE *stream, struct kvm_dtable *dtable,
  66                         uint8_t indent)
  67 {
  68         fprintf(stream, "%*sbase: 0x%.16llx limit: 0x%.4x "
  69                 "padding: 0x%.4x 0x%.4x 0x%.4x\n",
  70                 indent, "", dtable->base, dtable->limit,
  71                 dtable->padding[0], dtable->padding[1], dtable->padding[2]);
  72 }
  73
  74 static void sregs_dump(FILE *stream, struct kvm_sregs *sregs, uint8_t indent)
  75 {
  76         unsigned int i;
  77
  78         fprintf(stream, "%*scs:\n", indent, "");
  79         segment_dump(stream, &sregs->cs, indent + 2);
  80         fprintf(stream, "%*sds:\n", indent, "");
  81         segment_dump(stream, &sregs->ds, indent + 2);
  82         fprintf(stream, "%*ses:\n", indent, "");
  83         segment_dump(stream, &sregs->es, indent + 2);
  84         fprintf(stream, "%*sfs:\n", indent, "");
  85         segment_dump(stream, &sregs->fs, indent + 2);
  86         fprintf(stream, "%*sgs:\n", indent, "");
  87         segment_dump(stream, &sregs->gs, indent + 2);
  88         fprintf(stream, "%*sss:\n", indent, "");
  89         segment_dump(stream, &sregs->ss, indent + 2);
  90         fprintf(stream, "%*str:\n", indent, "");
  91         segment_dump(stream, &sregs->tr, indent + 2);
  92         fprintf(stream, "%*sldt:\n", indent, "");
  93         segment_dump(stream, &sregs->ldt, indent + 2);
  94
  95         fprintf(stream, "%*sgdt:\n", indent, "");
  96         dtable_dump(stream, &sregs->gdt, indent + 2);
  97         fprintf(stream, "%*sidt:\n", indent, "");
  98         dtable_dump(stream, &sregs->idt, indent + 2);
  99
 100         fprintf(stream, "%*scr0: 0x%.16llx cr2: 0x%.16llx "
 101                 "cr3: 0x%.16llx cr4: 0x%.16llx\n",
 102                 indent, "",
 103                 sregs->cr0, sregs->cr2, sregs->cr3, sregs->cr4);
 104         fprintf(stream, "%*scr8: 0x%.16llx efer: 0x%.16llx "
 105                 "apic_base: 0x%.16llx\n",
 106                 indent, "",
 107                 sregs->cr8, sregs->efer, sregs->apic_base);
 108
 109         fprintf(stream, "%*sinterrupt_bitmap:\n", indent, "");
 110         for (i = 0; i < (KVM_NR_INTERRUPTS + 63) / 64; i++) {
 111                 fprintf(stream, "%*s%.16llx\n", indent + 2, "",
 112                         sregs->interrupt_bitmap[i]);
 113         }
 114 }
 115
 116 bool kvm_is_tdp_enabled(void)
 117 {
 118         if (host_cpu_is_intel)
 119                 return get_kvm_intel_param_bool("ept");
 120         else
 121                 return get_kvm_amd_param_bool("npt");
 122 }
 123
 124 void virt_arch_pgd_alloc(struct kvm_vm *vm)
 125 {
 126         TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
 127                 "unknown or unsupported guest mode, mode: 0x%x", vm->mode);
 128
 129         /* If needed, create page map l4 table. */
 130         if (!vm->pgd_created) {
 131                 vm->pgd = vm_alloc_page_table(vm);
 132                 vm->pgd_created = true;
 133         }
 134 }
 135
 136 static void *virt_get_pte(struct kvm_vm *vm, uint64_t *parent_pte,
 137                           uint64_t vaddr, int level)
 138 {
 139         uint64_t pt_gpa = PTE_GET_PA(*parent_pte);
 140         uint64_t *page_table = addr_gpa2hva(vm, pt_gpa);
 141         int index = (vaddr >> PG_LEVEL_SHIFT(level)) & 0x1ffu;
 142
 143         TEST_ASSERT((*parent_pte & PTE_PRESENT_MASK) || parent_pte == &vm->pgd,
 144                     "Parent PTE (level %d) not PRESENT for gva: 0x%08lx",
 145                     level + 1, vaddr);
 146
 147         return &page_table[index];
 148 }
 149
 150 static uint64_t *virt_create_upper_pte(struct kvm_vm *vm,
 151                                        uint64_t *parent_pte,
 152                                        uint64_t vaddr,
 153                                        uint64_t paddr,
 154                                        int current_level,
 155                                        int target_level)
 156 {
 157         uint64_t *pte = virt_get_pte(vm, parent_pte, vaddr, current_level);
 158
 159         if (!(*pte & PTE_PRESENT_MASK)) {
 160                 *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK;
 161                 if (current_level == target_level)
 162                         *pte |= PTE_LARGE_MASK | (paddr & PHYSICAL_PAGE_MASK);
 163                 else
 164                         *pte |= vm_alloc_page_table(vm) & PHYSICAL_PAGE_MASK;
 165         } else {
 166                 /*
 167                  * Entry already present.  Assert that the caller doesn't want
 168                  * a hugepage at this level, and that there isn't a hugepage at
 169                  * this level.
 170                  */
 171                 TEST_ASSERT(current_level != target_level,
 172                             "Cannot create hugepage at level: %u, vaddr: 0x%lx\n",
 173                             current_level, vaddr);
 174                 TEST_ASSERT(!(*pte & PTE_LARGE_MASK),
 175                             "Cannot create page table at level: %u, vaddr: 0x%lx\n",
 176                             current_level, vaddr);
 177         }
 178         return pte;
 179 }
 180
 181 void __virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr, int level)
 182 {
 183         const uint64_t pg_size = PG_LEVEL_SIZE(level);
 184         uint64_t *pml4e, *pdpe, *pde;
 185         uint64_t *pte;
 186
 187         TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K,
 188                     "Unknown or unsupported guest mode, mode: 0x%x", vm->mode);
 189
 190         TEST_ASSERT((vaddr % pg_size) == 0,
 191                     "Virtual address not aligned,\n"
 192                     "vaddr: 0x%lx page size: 0x%lx", vaddr, pg_size);
 193         TEST_ASSERT(sparsebit_is_set(vm->vpages_valid, (vaddr >> vm->page_shift)),
 194                     "Invalid virtual address, vaddr: 0x%lx", vaddr);
 195         TEST_ASSERT((paddr % pg_size) == 0,
 196                     "Physical address not aligned,\n"
 197                     "  paddr: 0x%lx page size: 0x%lx", paddr, pg_size);
 198         TEST_ASSERT((paddr >> vm->page_shift) <= vm->max_gfn,
 199                     "Physical address beyond maximum supported,\n"
 200                     "  paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
 201                     paddr, vm->max_gfn, vm->page_size);
 202
 203         /*
 204          * Allocate upper level page tables, if not already present.  Return
 205          * early if a hugepage was created.
 206          */
 207         pml4e = virt_create_upper_pte(vm, &vm->pgd, vaddr, paddr, PG_LEVEL_512G, level);
 208         if (*pml4e & PTE_LARGE_MASK)
 209                 return;
 210
 211         pdpe = virt_create_upper_pte(vm, pml4e, vaddr, paddr, PG_LEVEL_1G, level);
 212         if (*pdpe & PTE_LARGE_MASK)
 213                 return;
 214
 215         pde = virt_create_upper_pte(vm, pdpe, vaddr, paddr, PG_LEVEL_2M, level);
 216         if (*pde & PTE_LARGE_MASK)
 217                 return;
 218
 219         /* Fill in page table entry. */
 220         pte = virt_get_pte(vm, pde, vaddr, PG_LEVEL_4K);
 221         TEST_ASSERT(!(*pte & PTE_PRESENT_MASK),
 222                     "PTE already present for 4k page at vaddr: 0x%lx\n", vaddr);
 223         *pte = PTE_PRESENT_MASK | PTE_WRITABLE_MASK | (paddr & PHYSICAL_PAGE_MASK);
 224 }
 225
 226 void virt_arch_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
 227 {
 228         __virt_pg_map(vm, vaddr, paddr, PG_LEVEL_4K);
 229 }
 230
 231 void virt_map_level(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
 232                     uint64_t nr_bytes, int level)
 233 {
 234         uint64_t pg_size = PG_LEVEL_SIZE(level);
 235         uint64_t nr_pages = nr_bytes / pg_size;
 236         int i;
 237
 238         TEST_ASSERT(nr_bytes % pg_size == 0,
 239                     "Region size not aligned: nr_bytes: 0x%lx, page size: 0x%lx",
 240                     nr_bytes, pg_size);
 241
 242         for (i = 0; i < nr_pages; i++) {
 243                 __virt_pg_map(vm, vaddr, paddr, level);
 244
 245                 vaddr += pg_size;
 246                 paddr += pg_size;
 247         }
 248 }
 249
 250 static bool vm_is_target_pte(uint64_t *pte, int *level, int current_level)
 251 {
 252         if (*pte & PTE_LARGE_MASK) {
 253                 TEST_ASSERT(*level == PG_LEVEL_NONE ||
 254                             *level == current_level,
 255                             "Unexpected hugepage at level %d\n", current_level);
 256                 *level = current_level;
 257         }
 258
 259         return *level == current_level;
 260 }
 261
 262 uint64_t *__vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr,
 263                                     int *level)
 264 {
 265         uint64_t *pml4e, *pdpe, *pde;
 266
 267         TEST_ASSERT(*level >= PG_LEVEL_NONE && *level < PG_LEVEL_NUM,
 268                     "Invalid PG_LEVEL_* '%d'", *level);
 269
 270         TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
 271                 "unknown or unsupported guest mode, mode: 0x%x", vm->mode);
 272         TEST_ASSERT(sparsebit_is_set(vm->vpages_valid,
 273                 (vaddr >> vm->page_shift)),
 274                 "Invalid virtual address, vaddr: 0x%lx",
 275                 vaddr);
 276         /*
 277          * Based on the mode check above there are 48 bits in the vaddr, so
 278          * shift 16 to sign extend the last bit (bit-47),
 279          */
 280         TEST_ASSERT(vaddr == (((int64_t)vaddr << 16) >> 16),
 281                 "Canonical check failed.  The virtual address is invalid.");
 282
 283         pml4e = virt_get_pte(vm, &vm->pgd, vaddr, PG_LEVEL_512G);
 284         if (vm_is_target_pte(pml4e, level, PG_LEVEL_512G))
 285                 return pml4e;
 286
 287         pdpe = virt_get_pte(vm, pml4e, vaddr, PG_LEVEL_1G);
 288         if (vm_is_target_pte(pdpe, level, PG_LEVEL_1G))
 289                 return pdpe;
 290
 291         pde = virt_get_pte(vm, pdpe, vaddr, PG_LEVEL_2M);
 292         if (vm_is_target_pte(pde, level, PG_LEVEL_2M))
 293                 return pde;
 294
 295         return virt_get_pte(vm, pde, vaddr, PG_LEVEL_4K);
 296 }
 297
 298 uint64_t *vm_get_page_table_entry(struct kvm_vm *vm, uint64_t vaddr)
 299 {
 300         int level = PG_LEVEL_4K;
 301
 302         return __vm_get_page_table_entry(vm, vaddr, &level);
 303 }
 304
 305 void virt_arch_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
 306 {
 307         uint64_t *pml4e, *pml4e_start;
 308         uint64_t *pdpe, *pdpe_start;
 309         uint64_t *pde, *pde_start;
 310         uint64_t *pte, *pte_start;
 311
 312         if (!vm->pgd_created)
 313                 return;
 314
 315         fprintf(stream, "%*s                                          "
 316                 "                no\n", indent, "");
 317         fprintf(stream, "%*s      index hvaddr         gpaddr         "
 318                 "addr         w exec dirty\n",
 319                 indent, "");
 320         pml4e_start = (uint64_t *) addr_gpa2hva(vm, vm->pgd);
 321         for (uint16_t n1 = 0; n1 <= 0x1ffu; n1++) {
 322                 pml4e = &pml4e_start[n1];
 323                 if (!(*pml4e & PTE_PRESENT_MASK))
 324                         continue;
 325                 fprintf(stream, "%*spml4e 0x%-3zx %p 0x%-12lx 0x%-10llx %u "
 326                         " %u\n",
 327                         indent, "",
 328                         pml4e - pml4e_start, pml4e,
 329                         addr_hva2gpa(vm, pml4e), PTE_GET_PFN(*pml4e),
 330                         !!(*pml4e & PTE_WRITABLE_MASK), !!(*pml4e & PTE_NX_MASK));
 331
 332                 pdpe_start = addr_gpa2hva(vm, *pml4e & PHYSICAL_PAGE_MASK);
 333                 for (uint16_t n2 = 0; n2 <= 0x1ffu; n2++) {
 334                         pdpe = &pdpe_start[n2];
 335                         if (!(*pdpe & PTE_PRESENT_MASK))
 336                                 continue;
 337                         fprintf(stream, "%*spdpe  0x%-3zx %p 0x%-12lx 0x%-10llx "
 338                                 "%u  %u\n",
 339                                 indent, "",
 340                                 pdpe - pdpe_start, pdpe,
 341                                 addr_hva2gpa(vm, pdpe),
 342                                 PTE_GET_PFN(*pdpe), !!(*pdpe & PTE_WRITABLE_MASK),
 343                                 !!(*pdpe & PTE_NX_MASK));
 344
 345                         pde_start = addr_gpa2hva(vm, *pdpe & PHYSICAL_PAGE_MASK);
 346                         for (uint16_t n3 = 0; n3 <= 0x1ffu; n3++) {
 347                                 pde = &pde_start[n3];
 348                                 if (!(*pde & PTE_PRESENT_MASK))
 349                                         continue;
 350                                 fprintf(stream, "%*spde   0x%-3zx %p "
 351                                         "0x%-12lx 0x%-10llx %u  %u\n",
 352                                         indent, "", pde - pde_start, pde,
 353                                         addr_hva2gpa(vm, pde),
 354                                         PTE_GET_PFN(*pde), !!(*pde & PTE_WRITABLE_MASK),
 355                                         !!(*pde & PTE_NX_MASK));
 356
 357                                 pte_start = addr_gpa2hva(vm, *pde & PHYSICAL_PAGE_MASK);
 358                                 for (uint16_t n4 = 0; n4 <= 0x1ffu; n4++) {
 359                                         pte = &pte_start[n4];
 360                                         if (!(*pte & PTE_PRESENT_MASK))
 361                                                 continue;
 362                                         fprintf(stream, "%*spte   0x%-3zx %p "
 363                                                 "0x%-12lx 0x%-10llx %u  %u "
 364                                                 "    %u    0x%-10lx\n",
 365                                                 indent, "",
 366                                                 pte - pte_start, pte,
 367                                                 addr_hva2gpa(vm, pte),
 368                                                 PTE_GET_PFN(*pte),
 369                                                 !!(*pte & PTE_WRITABLE_MASK),
 370                                                 !!(*pte & PTE_NX_MASK),
 371                                                 !!(*pte & PTE_DIRTY_MASK),
 372                                                 ((uint64_t) n1 << 27)
 373                                                         | ((uint64_t) n2 << 18)
 374                                                         | ((uint64_t) n3 << 9)
 375                                                         | ((uint64_t) n4));
 376                                 }
 377                         }
 378                 }
 379         }
 380 }
 381
 382 /*
 383  * Set Unusable Segment
 384  *
 385  * Input Args: None
 386  *
 387  * Output Args:
 388  *   segp - Pointer to segment register
 389  *
 390  * Return: None
 391  *
 392  * Sets the segment register pointed to by @segp to an unusable state.
 393  */
 394 static void kvm_seg_set_unusable(struct kvm_segment *segp)
 395 {
 396         memset(segp, 0, sizeof(*segp));
 397         segp->unusable = true;
 398 }
 399
 400 static void kvm_seg_fill_gdt_64bit(struct kvm_vm *vm, struct kvm_segment *segp)
 401 {
 402         void *gdt = addr_gva2hva(vm, vm->gdt);
 403         struct desc64 *desc = gdt + (segp->selector >> 3) * 8;
 404
 405         desc->limit0 = segp->limit & 0xFFFF;
 406         desc->base0 = segp->base & 0xFFFF;
 407         desc->base1 = segp->base >> 16;
 408         desc->type = segp->type;
 409         desc->s = segp->s;
 410         desc->dpl = segp->dpl;
 411         desc->p = segp->present;
 412         desc->limit1 = segp->limit >> 16;
 413         desc->avl = segp->avl;
 414         desc->l = segp->l;
 415         desc->db = segp->db;
 416         desc->g = segp->g;
 417         desc->base2 = segp->base >> 24;
 418         if (!segp->s)
 419                 desc->base3 = segp->base >> 32;
 420 }
 421
 422
 423 /*
 424  * Set Long Mode Flat Kernel Code Segment
 425  *
 426  * Input Args:
 427  *   vm - VM whose GDT is being filled, or NULL to only write segp
 428  *   selector - selector value
 429  *
 430  * Output Args:
 431  *   segp - Pointer to KVM segment
 432  *
 433  * Return: None
 434  *
 435  * Sets up the KVM segment pointed to by @segp, to be a code segment
 436  * with the selector value given by @selector.
 437  */
 438 static void kvm_seg_set_kernel_code_64bit(struct kvm_vm *vm, uint16_t selector,
 439         struct kvm_segment *segp)
 440 {
 441         memset(segp, 0, sizeof(*segp));
 442         segp->selector = selector;
 443         segp->limit = 0xFFFFFFFFu;
 444         segp->s = 0x1; /* kTypeCodeData */
 445         segp->type = 0x08 | 0x01 | 0x02; /* kFlagCode | kFlagCodeAccessed
 446                                           * | kFlagCodeReadable
 447                                           */
 448         segp->g = true;
 449         segp->l = true;
 450         segp->present = 1;
 451         if (vm)
 452                 kvm_seg_fill_gdt_64bit(vm, segp);
 453 }
 454
 455 /*
 456  * Set Long Mode Flat Kernel Data Segment
 457  *
 458  * Input Args:
 459  *   vm - VM whose GDT is being filled, or NULL to only write segp
 460  *   selector - selector value
 461  *
 462  * Output Args:
 463  *   segp - Pointer to KVM segment
 464  *
 465  * Return: None
 466  *
 467  * Sets up the KVM segment pointed to by @segp, to be a data segment
 468  * with the selector value given by @selector.
 469  */
 470 static void kvm_seg_set_kernel_data_64bit(struct kvm_vm *vm, uint16_t selector,
 471         struct kvm_segment *segp)
 472 {
 473         memset(segp, 0, sizeof(*segp));
 474         segp->selector = selector;
 475         segp->limit = 0xFFFFFFFFu;
 476         segp->s = 0x1; /* kTypeCodeData */
 477         segp->type = 0x00 | 0x01 | 0x02; /* kFlagData | kFlagDataAccessed
 478                                           * | kFlagDataWritable
 479                                           */
 480         segp->g = true;
 481         segp->present = true;
 482         if (vm)
 483                 kvm_seg_fill_gdt_64bit(vm, segp);
 484 }
 485
 486 vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
 487 {
 488         int level = PG_LEVEL_NONE;
 489         uint64_t *pte = __vm_get_page_table_entry(vm, gva, &level);
 490
 491         TEST_ASSERT(*pte & PTE_PRESENT_MASK,
 492                     "Leaf PTE not PRESENT for gva: 0x%08lx", gva);
 493
 494         /*
 495          * No need for a hugepage mask on the PTE, x86-64 requires the "unused"
 496          * address bits to be zero.
 497          */
 498         return PTE_GET_PA(*pte) | (gva & ~HUGEPAGE_MASK(level));
 499 }
 500
 501 static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt)
 502 {
 503         if (!vm->gdt)
 504                 vm->gdt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
 505
 506         dt->base = vm->gdt;
 507         dt->limit = getpagesize();
 508 }
 509
 510 static void kvm_setup_tss_64bit(struct kvm_vm *vm, struct kvm_segment *segp,
 511                                 int selector)
 512 {
 513         if (!vm->tss)
 514                 vm->tss = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
 515
 516         memset(segp, 0, sizeof(*segp));
 517         segp->base = vm->tss;
 518         segp->limit = 0x67;
 519         segp->selector = selector;
 520         segp->type = 0xb;
 521         segp->present = 1;
 522         kvm_seg_fill_gdt_64bit(vm, segp);
 523 }
 524
 525 static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
 526 {
 527         struct kvm_sregs sregs;
 528
 529         /* Set mode specific system register values. */
 530         vcpu_sregs_get(vcpu, &sregs);
 531
 532         sregs.idt.limit = 0;
 533
 534         kvm_setup_gdt(vm, &sregs.gdt);
 535
 536         switch (vm->mode) {
 537         case VM_MODE_PXXV48_4K:
 538                 sregs.cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG;
 539                 sregs.cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR;
 540                 sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX);
 541
 542                 kvm_seg_set_unusable(&sregs.ldt);
 543                 kvm_seg_set_kernel_code_64bit(vm, DEFAULT_CODE_SELECTOR, &sregs.cs);
 544                 kvm_seg_set_kernel_data_64bit(vm, DEFAULT_DATA_SELECTOR, &sregs.ds);
 545                 kvm_seg_set_kernel_data_64bit(vm, DEFAULT_DATA_SELECTOR, &sregs.es);
 546                 kvm_setup_tss_64bit(vm, &sregs.tr, 0x18);
 547                 break;
 548
 549         default:
 550                 TEST_FAIL("Unknown guest mode, mode: 0x%x", vm->mode);
 551         }
 552
 553         sregs.cr3 = vm->pgd;
 554         vcpu_sregs_set(vcpu, &sregs);
 555 }
 556
 557 void kvm_arch_vm_post_create(struct kvm_vm *vm)
 558 {
 559         vm_create_irqchip(vm);
 560         sync_global_to_guest(vm, host_cpu_is_intel);
 561         sync_global_to_guest(vm, host_cpu_is_amd);
 562 }
 563
 564 struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id,
 565                                   void *guest_code)
 566 {
 567         struct kvm_mp_state mp_state;
 568         struct kvm_regs regs;
 569         vm_vaddr_t stack_vaddr;
 570         struct kvm_vcpu *vcpu;
 571
 572         stack_vaddr = __vm_vaddr_alloc(vm, DEFAULT_STACK_PGS * getpagesize(),
 573                                        DEFAULT_GUEST_STACK_VADDR_MIN,
 574                                        MEM_REGION_DATA);
 575
 576         vcpu = __vm_vcpu_add(vm, vcpu_id);
 577         vcpu_init_cpuid(vcpu, kvm_get_supported_cpuid());
 578         vcpu_setup(vm, vcpu);
 579
 580         /* Setup guest general purpose registers */
 581         vcpu_regs_get(vcpu, &regs);
 582         regs.rflags = regs.rflags | 0x2;
 583         regs.rsp = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize());
 584         regs.rip = (unsigned long) guest_code;
 585         vcpu_regs_set(vcpu, &regs);
 586
 587         /* Setup the MP state */
 588         mp_state.mp_state = 0;
 589         vcpu_mp_state_set(vcpu, &mp_state);
 590
 591         return vcpu;
 592 }
 593
 594 struct kvm_vcpu *vm_arch_vcpu_recreate(struct kvm_vm *vm, uint32_t vcpu_id)
 595 {
 596         struct kvm_vcpu *vcpu = __vm_vcpu_add(vm, vcpu_id);
 597
 598         vcpu_init_cpuid(vcpu, kvm_get_supported_cpuid());
 599
 600         return vcpu;
 601 }
 602
 603 void vcpu_arch_free(struct kvm_vcpu *vcpu)
 604 {
 605         if (vcpu->cpuid)
 606                 free(vcpu->cpuid);
 607 }
 608
 609 /* Do not use kvm_supported_cpuid directly except for validity checks. */
 610 static void *kvm_supported_cpuid;
 611
 612 const struct kvm_cpuid2 *kvm_get_supported_cpuid(void)
 613 {
 614         int kvm_fd;
 615
 616         if (kvm_supported_cpuid)
 617                 return kvm_supported_cpuid;
 618
 619         kvm_supported_cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
 620         kvm_fd = open_kvm_dev_path_or_exit();
 621
 622         kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_CPUID,
 623                   (struct kvm_cpuid2 *)kvm_supported_cpuid);
 624
 625         close(kvm_fd);
 626         return kvm_supported_cpuid;
 627 }
 628
 629 static uint32_t __kvm_cpu_has(const struct kvm_cpuid2 *cpuid,
 630                               uint32_t function, uint32_t index,
 631                               uint8_t reg, uint8_t lo, uint8_t hi)
 632 {
 633         const struct kvm_cpuid_entry2 *entry;
 634         int i;
 635
 636         for (i = 0; i < cpuid->nent; i++) {
 637                 entry = &cpuid->entries[i];
 638
 639                 /*
 640                  * The output registers in kvm_cpuid_entry2 are in alphabetical
 641                  * order, but kvm_x86_cpu_feature matches that mess, so yay
 642                  * pointer shenanigans!
 643                  */
 644                 if (entry->function == function && entry->index == index)
 645                         return ((&entry->eax)[reg] & GENMASK(hi, lo)) >> lo;
 646         }
 647
 648         return 0;
 649 }
 650
 651 bool kvm_cpuid_has(const struct kvm_cpuid2 *cpuid,
 652                    struct kvm_x86_cpu_feature feature)
 653 {
 654         return __kvm_cpu_has(cpuid, feature.function, feature.index,
 655                              feature.reg, feature.bit, feature.bit);
 656 }
 657
 658 uint32_t kvm_cpuid_property(const struct kvm_cpuid2 *cpuid,
 659                             struct kvm_x86_cpu_property property)
 660 {
 661         return __kvm_cpu_has(cpuid, property.function, property.index,
 662                              property.reg, property.lo_bit, property.hi_bit);
 663 }
 664
 665 uint64_t kvm_get_feature_msr(uint64_t msr_index)
 666 {
 667         struct {
 668                 struct kvm_msrs header;
 669                 struct kvm_msr_entry entry;
 670         } buffer = {};
 671         int r, kvm_fd;
 672
 673         buffer.header.nmsrs = 1;
 674         buffer.entry.index = msr_index;
 675         kvm_fd = open_kvm_dev_path_or_exit();
 676
 677         r = __kvm_ioctl(kvm_fd, KVM_GET_MSRS, &buffer.header);
 678         TEST_ASSERT(r == 1, KVM_IOCTL_ERROR(KVM_GET_MSRS, r));
 679
 680         close(kvm_fd);
 681         return buffer.entry.data;
 682 }
 683
 684 void __vm_xsave_require_permission(int bit, const char *name)
 685 {
 686         int kvm_fd;
 687         u64 bitmask;
 688         long rc;
 689         struct kvm_device_attr attr = {
 690                 .group = 0,
 691                 .attr = KVM_X86_XCOMP_GUEST_SUPP,
 692                 .addr = (unsigned long) &bitmask
 693         };
 694
 695         TEST_ASSERT(!kvm_supported_cpuid,
 696                     "kvm_get_supported_cpuid() cannot be used before ARCH_REQ_XCOMP_GUEST_PERM");
 697
 698         kvm_fd = open_kvm_dev_path_or_exit();
 699         rc = __kvm_ioctl(kvm_fd, KVM_GET_DEVICE_ATTR, &attr);
 700         close(kvm_fd);
 701
 702         if (rc == -1 && (errno == ENXIO || errno == EINVAL))
 703                 __TEST_REQUIRE(0, "KVM_X86_XCOMP_GUEST_SUPP not supported");
 704
 705         TEST_ASSERT(rc == 0, "KVM_GET_DEVICE_ATTR(0, KVM_X86_XCOMP_GUEST_SUPP) error: %ld", rc);
 706
 707         __TEST_REQUIRE(bitmask & (1ULL << bit),
 708                        "Required XSAVE feature '%s' not supported", name);
 709
 710         TEST_REQUIRE(!syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_GUEST_PERM, bit));
 711
 712         rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_GUEST_PERM, &bitmask);
 713         TEST_ASSERT(rc == 0, "prctl(ARCH_GET_XCOMP_GUEST_PERM) error: %ld", rc);
 714         TEST_ASSERT(bitmask & (1ULL << bit),
 715                     "prctl(ARCH_REQ_XCOMP_GUEST_PERM) failure bitmask=0x%lx",
 716                     bitmask);
 717 }
 718
 719 void vcpu_init_cpuid(struct kvm_vcpu *vcpu, const struct kvm_cpuid2 *cpuid)
 720 {
 721         TEST_ASSERT(cpuid != vcpu->cpuid, "@cpuid can't be the vCPU's CPUID");
 722
 723         /* Allow overriding the default CPUID. */
 724         if (vcpu->cpuid && vcpu->cpuid->nent < cpuid->nent) {
 725                 free(vcpu->cpuid);
 726                 vcpu->cpuid = NULL;
 727         }
 728
 729         if (!vcpu->cpuid)
 730                 vcpu->cpuid = allocate_kvm_cpuid2(cpuid->nent);
 731
 732         memcpy(vcpu->cpuid, cpuid, kvm_cpuid2_size(cpuid->nent));
 733         vcpu_set_cpuid(vcpu);
 734 }
 735
 736 void vcpu_set_cpuid_maxphyaddr(struct kvm_vcpu *vcpu, uint8_t maxphyaddr)
 737 {
 738         struct kvm_cpuid_entry2 *entry = vcpu_get_cpuid_entry(vcpu, 0x80000008);
 739
 740         entry->eax = (entry->eax & ~0xff) | maxphyaddr;
 741         vcpu_set_cpuid(vcpu);
 742 }
 743
 744 void vcpu_clear_cpuid_entry(struct kvm_vcpu *vcpu, uint32_t function)
 745 {
 746         struct kvm_cpuid_entry2 *entry = vcpu_get_cpuid_entry(vcpu, function);
 747
 748         entry->eax = 0;
 749         entry->ebx = 0;
 750         entry->ecx = 0;
 751         entry->edx = 0;
 752         vcpu_set_cpuid(vcpu);
 753 }
 754
 755 void vcpu_set_or_clear_cpuid_feature(struct kvm_vcpu *vcpu,
 756                                      struct kvm_x86_cpu_feature feature,
 757                                      bool set)
 758 {
 759         struct kvm_cpuid_entry2 *entry;
 760         u32 *reg;
 761
 762         entry = __vcpu_get_cpuid_entry(vcpu, feature.function, feature.index);
 763         reg = (&entry->eax) + feature.reg;
 764
 765         if (set)
 766                 *reg |= BIT(feature.bit);
 767         else
 768                 *reg &= ~BIT(feature.bit);
 769
 770         vcpu_set_cpuid(vcpu);
 771 }
 772
 773 uint64_t vcpu_get_msr(struct kvm_vcpu *vcpu, uint64_t msr_index)
 774 {
 775         struct {
 776                 struct kvm_msrs header;
 777                 struct kvm_msr_entry entry;
 778         } buffer = {};
 779
 780         buffer.header.nmsrs = 1;
 781         buffer.entry.index = msr_index;
 782
 783         vcpu_msrs_get(vcpu, &buffer.header);
 784
 785         return buffer.entry.data;
 786 }
 787
 788 int _vcpu_set_msr(struct kvm_vcpu *vcpu, uint64_t msr_index, uint64_t msr_value)
 789 {
 790         struct {
 791                 struct kvm_msrs header;
 792                 struct kvm_msr_entry entry;
 793         } buffer = {};
 794
 795         memset(&buffer, 0, sizeof(buffer));
 796         buffer.header.nmsrs = 1;
 797         buffer.entry.index = msr_index;
 798         buffer.entry.data = msr_value;
 799
 800         return __vcpu_ioctl(vcpu, KVM_SET_MSRS, &buffer.header);
 801 }
 802
 803 void vcpu_args_set(struct kvm_vcpu *vcpu, unsigned int num, ...)
 804 {
 805         va_list ap;
 806         struct kvm_regs regs;
 807
 808         TEST_ASSERT(num >= 1 && num <= 6, "Unsupported number of args,\n"
 809                     "  num: %u\n",
 810                     num);
 811
 812         va_start(ap, num);
 813         vcpu_regs_get(vcpu, &regs);
 814
 815         if (num >= 1)
 816                 regs.rdi = va_arg(ap, uint64_t);
 817
 818         if (num >= 2)
 819                 regs.rsi = va_arg(ap, uint64_t);
 820
 821         if (num >= 3)
 822                 regs.rdx = va_arg(ap, uint64_t);
 823
 824         if (num >= 4)
 825                 regs.rcx = va_arg(ap, uint64_t);
 826
 827         if (num >= 5)
 828                 regs.r8 = va_arg(ap, uint64_t);
 829
 830         if (num >= 6)
 831                 regs.r9 = va_arg(ap, uint64_t);
 832
 833         vcpu_regs_set(vcpu, &regs);
 834         va_end(ap);
 835 }
 836
 837 void vcpu_arch_dump(FILE *stream, struct kvm_vcpu *vcpu, uint8_t indent)
 838 {
 839         struct kvm_regs regs;
 840         struct kvm_sregs sregs;
 841
 842         fprintf(stream, "%*svCPU ID: %u\n", indent, "", vcpu->id);
 843
 844         fprintf(stream, "%*sregs:\n", indent + 2, "");
 845         vcpu_regs_get(vcpu, &regs);
 846         regs_dump(stream, &regs, indent + 4);
 847
 848         fprintf(stream, "%*ssregs:\n", indent + 2, "");
 849         vcpu_sregs_get(vcpu, &sregs);
 850         sregs_dump(stream, &sregs, indent + 4);
 851 }
 852
 853 static struct kvm_msr_list *__kvm_get_msr_index_list(bool feature_msrs)
 854 {
 855         struct kvm_msr_list *list;
 856         struct kvm_msr_list nmsrs;
 857         int kvm_fd, r;
 858
 859         kvm_fd = open_kvm_dev_path_or_exit();
 860
 861         nmsrs.nmsrs = 0;
 862         if (!feature_msrs)
 863                 r = __kvm_ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, &nmsrs);
 864         else
 865                 r = __kvm_ioctl(kvm_fd, KVM_GET_MSR_FEATURE_INDEX_LIST, &nmsrs);
 866
 867         TEST_ASSERT(r == -1 && errno == E2BIG,
 868                     "Expected -E2BIG, got rc: %i errno: %i (%s)",
 869                     r, errno, strerror(errno));
 870
 871         list = malloc(sizeof(*list) + nmsrs.nmsrs * sizeof(list->indices[0]));
 872         TEST_ASSERT(list, "-ENOMEM when allocating MSR index list");
 873         list->nmsrs = nmsrs.nmsrs;
 874
 875         if (!feature_msrs)
 876                 kvm_ioctl(kvm_fd, KVM_GET_MSR_INDEX_LIST, list);
 877         else
 878                 kvm_ioctl(kvm_fd, KVM_GET_MSR_FEATURE_INDEX_LIST, list);
 879         close(kvm_fd);
 880
 881         TEST_ASSERT(list->nmsrs == nmsrs.nmsrs,
 882                     "Number of MSRs in list changed, was %d, now %d",
 883                     nmsrs.nmsrs, list->nmsrs);
 884         return list;
 885 }
 886
 887 const struct kvm_msr_list *kvm_get_msr_index_list(void)
 888 {
 889         static const struct kvm_msr_list *list;
 890
 891         if (!list)
 892                 list = __kvm_get_msr_index_list(false);
 893         return list;
 894 }
 895
 896
 897 const struct kvm_msr_list *kvm_get_feature_msr_index_list(void)
 898 {
 899         static const struct kvm_msr_list *list;
 900
 901         if (!list)
 902                 list = __kvm_get_msr_index_list(true);
 903         return list;
 904 }
 905
 906 bool kvm_msr_is_in_save_restore_list(uint32_t msr_index)
 907 {
 908         const struct kvm_msr_list *list = kvm_get_msr_index_list();
 909         int i;
 910
 911         for (i = 0; i < list->nmsrs; ++i) {
 912                 if (list->indices[i] == msr_index)
 913                         return true;
 914         }
 915
 916         return false;
 917 }
 918
 919 static void vcpu_save_xsave_state(struct kvm_vcpu *vcpu,
 920                                   struct kvm_x86_state *state)
 921 {
 922         int size = vm_check_cap(vcpu->vm, KVM_CAP_XSAVE2);
 923
 924         if (size) {
 925                 state->xsave = malloc(size);
 926                 vcpu_xsave2_get(vcpu, state->xsave);
 927         } else {
 928                 state->xsave = malloc(sizeof(struct kvm_xsave));
 929                 vcpu_xsave_get(vcpu, state->xsave);
 930         }
 931 }
 932
 933 struct kvm_x86_state *vcpu_save_state(struct kvm_vcpu *vcpu)
 934 {
 935         const struct kvm_msr_list *msr_list = kvm_get_msr_index_list();
 936         struct kvm_x86_state *state;
 937         int i;
 938
 939         static int nested_size = -1;
 940
 941         if (nested_size == -1) {
 942                 nested_size = kvm_check_cap(KVM_CAP_NESTED_STATE);
 943                 TEST_ASSERT(nested_size <= sizeof(state->nested_),
 944                             "Nested state size too big, %i > %zi",
 945                             nested_size, sizeof(state->nested_));
 946         }
 947
 948         /*
 949          * When KVM exits to userspace with KVM_EXIT_IO, KVM guarantees
 950          * guest state is consistent only after userspace re-enters the
 951          * kernel with KVM_RUN.  Complete IO prior to migrating state
 952          * to a new VM.
 953          */
 954         vcpu_run_complete_io(vcpu);
 955
 956         state = malloc(sizeof(*state) + msr_list->nmsrs * sizeof(state->msrs.entries[0]));
 957
 958         vcpu_events_get(vcpu, &state->events);
 959         vcpu_mp_state_get(vcpu, &state->mp_state);
 960         vcpu_regs_get(vcpu, &state->regs);
 961         vcpu_save_xsave_state(vcpu, state);
 962
 963         if (kvm_has_cap(KVM_CAP_XCRS))
 964                 vcpu_xcrs_get(vcpu, &state->xcrs);
 965
 966         vcpu_sregs_get(vcpu, &state->sregs);
 967
 968         if (nested_size) {
 969                 state->nested.size = sizeof(state->nested_);
 970
 971                 vcpu_nested_state_get(vcpu, &state->nested);
 972                 TEST_ASSERT(state->nested.size <= nested_size,
 973                             "Nested state size too big, %i (KVM_CHECK_CAP gave %i)",
 974                             state->nested.size, nested_size);
 975         } else {
 976                 state->nested.size = 0;
 977         }
 978
 979         state->msrs.nmsrs = msr_list->nmsrs;
 980         for (i = 0; i < msr_list->nmsrs; i++)
 981                 state->msrs.entries[i].index = msr_list->indices[i];
 982         vcpu_msrs_get(vcpu, &state->msrs);
 983
 984         vcpu_debugregs_get(vcpu, &state->debugregs);
 985
 986         return state;
 987 }
 988
 989 void vcpu_load_state(struct kvm_vcpu *vcpu, struct kvm_x86_state *state)
 990 {
 991         vcpu_sregs_set(vcpu, &state->sregs);
 992         vcpu_msrs_set(vcpu, &state->msrs);
 993
 994         if (kvm_has_cap(KVM_CAP_XCRS))
 995                 vcpu_xcrs_set(vcpu, &state->xcrs);
 996
 997         vcpu_xsave_set(vcpu,  state->xsave);
 998         vcpu_events_set(vcpu, &state->events);
 999         vcpu_mp_state_set(vcpu, &state->mp_state);
1000         vcpu_debugregs_set(vcpu, &state->debugregs);
1001         vcpu_regs_set(vcpu, &state->regs);
1002
1003         if (state->nested.size)
1004                 vcpu_nested_state_set(vcpu, &state->nested);
1005 }
1006
1007 void kvm_x86_state_cleanup(struct kvm_x86_state *state)
1008 {
1009         free(state->xsave);
1010         free(state);
1011 }
1012
1013 void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits)
1014 {
1015         if (!kvm_cpu_has_p(X86_PROPERTY_MAX_PHY_ADDR)) {
1016                 *pa_bits = kvm_cpu_has(X86_FEATURE_PAE) ? 36 : 32;
1017                 *va_bits = 32;
1018         } else {
1019                 *pa_bits = kvm_cpu_property(X86_PROPERTY_MAX_PHY_ADDR);
1020                 *va_bits = kvm_cpu_property(X86_PROPERTY_MAX_VIRT_ADDR);
1021         }
1022 }
1023
1024 static void set_idt_entry(struct kvm_vm *vm, int vector, unsigned long addr,
1025                           int dpl, unsigned short selector)
1026 {
1027         struct idt_entry *base =
1028                 (struct idt_entry *)addr_gva2hva(vm, vm->idt);
1029         struct idt_entry *e = &base[vector];
1030
1031         memset(e, 0, sizeof(*e));
1032         e->offset0 = addr;
1033         e->selector = selector;
1034         e->ist = 0;
1035         e->type = 14;
1036         e->dpl = dpl;
1037         e->p = 1;
1038         e->offset1 = addr >> 16;
1039         e->offset2 = addr >> 32;
1040 }
1041
1042
1043 static bool kvm_fixup_exception(struct ex_regs *regs)
1044 {
1045         if (regs->r9 != KVM_EXCEPTION_MAGIC || regs->rip != regs->r10)
1046                 return false;
1047
1048         if (regs->vector == DE_VECTOR)
1049                 return false;
1050
1051         regs->rip = regs->r11;
1052         regs->r9 = regs->vector;
1053         regs->r10 = regs->error_code;
1054         return true;
1055 }
1056
1057 void kvm_exit_unexpected_vector(uint32_t value)
1058 {
1059         ucall(UCALL_UNHANDLED, 1, value);
1060 }
1061
1062 void route_exception(struct ex_regs *regs)
1063 {
1064         typedef void(*handler)(struct ex_regs *);
1065         handler *handlers = (handler *)exception_handlers;
1066
1067         if (handlers && handlers[regs->vector]) {
1068                 handlers[regs->vector](regs);
1069                 return;
1070         }
1071
1072         if (kvm_fixup_exception(regs))
1073                 return;
1074
1075         kvm_exit_unexpected_vector(regs->vector);
1076 }
1077
1078 void vm_init_descriptor_tables(struct kvm_vm *vm)
1079 {
1080         extern void *idt_handlers;
1081         int i;
1082
1083         vm->idt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
1084         vm->handlers = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
1085         /* Handlers have the same address in both address spaces.*/
1086         for (i = 0; i < NUM_INTERRUPTS; i++)
1087                 set_idt_entry(vm, i, (unsigned long)(&idt_handlers)[i], 0,
1088                         DEFAULT_CODE_SELECTOR);
1089 }
1090
1091 void vcpu_init_descriptor_tables(struct kvm_vcpu *vcpu)
1092 {
1093         struct kvm_vm *vm = vcpu->vm;
1094         struct kvm_sregs sregs;
1095
1096         vcpu_sregs_get(vcpu, &sregs);
1097         sregs.idt.base = vm->idt;
1098         sregs.idt.limit = NUM_INTERRUPTS * sizeof(struct idt_entry) - 1;
1099         sregs.gdt.base = vm->gdt;
1100         sregs.gdt.limit = getpagesize() - 1;
1101         kvm_seg_set_kernel_data_64bit(NULL, DEFAULT_DATA_SELECTOR, &sregs.gs);
1102         vcpu_sregs_set(vcpu, &sregs);
1103         *(vm_vaddr_t *)addr_gva2hva(vm, (vm_vaddr_t)(&exception_handlers)) = vm->handlers;
1104 }
1105
1106 void vm_install_exception_handler(struct kvm_vm *vm, int vector,
1107                                void (*handler)(struct ex_regs *))
1108 {
1109         vm_vaddr_t *handlers = (vm_vaddr_t *)addr_gva2hva(vm, vm->handlers);
1110
1111         handlers[vector] = (vm_vaddr_t)handler;
1112 }
1113
1114 void assert_on_unhandled_exception(struct kvm_vcpu *vcpu)
1115 {
1116         struct ucall uc;
1117
1118         if (get_ucall(vcpu, &uc) == UCALL_UNHANDLED) {
1119                 uint64_t vector = uc.args[0];
1120
1121                 TEST_FAIL("Unexpected vectored event in guest (vector:0x%lx)",
1122                           vector);
1123         }
1124 }
1125
1126 const struct kvm_cpuid_entry2 *get_cpuid_entry(const struct kvm_cpuid2 *cpuid,
1127                                                uint32_t function, uint32_t index)
1128 {
1129         int i;
1130
1131         for (i = 0; i < cpuid->nent; i++) {
1132                 if (cpuid->entries[i].function == function &&
1133                     cpuid->entries[i].index == index)
1134                         return &cpuid->entries[i];
1135         }
1136
1137         TEST_FAIL("CPUID function 0x%x index 0x%x not found ", function, index);
1138
1139         return NULL;
1140 }
1141
1142 #define X86_HYPERCALL(inputs...)                                        \
1143 ({                                                                      \
1144         uint64_t r;                                                     \
1145                                                                         \
1146         asm volatile("test %[use_vmmcall], %[use_vmmcall]\n\t"          \
1147                      "jnz 1f\n\t"                                       \
1148                      "vmcall\n\t"                                       \
1149                      "jmp 2f\n\t"                                       \
1150                      "1: vmmcall\n\t"                                   \
1151                      "2:"                                               \
1152                      : "=a"(r)                                          \
1153                      : [use_vmmcall] "r" (host_cpu_is_amd), inputs);    \
1154                                                                         \
1155         r;                                                              \
1156 })
1157
1158 uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
1159                        uint64_t a3)
1160 {
1161         return X86_HYPERCALL("a"(nr), "b"(a0), "c"(a1), "d"(a2), "S"(a3));
1162 }
1163
1164 const struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void)
1165 {
1166         static struct kvm_cpuid2 *cpuid;
1167         int kvm_fd;
1168
1169         if (cpuid)
1170                 return cpuid;
1171
1172         cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
1173         kvm_fd = open_kvm_dev_path_or_exit();
1174
1175         kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
1176
1177         close(kvm_fd);
1178         return cpuid;
1179 }
1180
1181 void vcpu_set_hv_cpuid(struct kvm_vcpu *vcpu)
1182 {
1183         static struct kvm_cpuid2 *cpuid_full;
1184         const struct kvm_cpuid2 *cpuid_sys, *cpuid_hv;
1185         int i, nent = 0;
1186
1187         if (!cpuid_full) {
1188                 cpuid_sys = kvm_get_supported_cpuid();
1189                 cpuid_hv = kvm_get_supported_hv_cpuid();
1190
1191                 cpuid_full = allocate_kvm_cpuid2(cpuid_sys->nent + cpuid_hv->nent);
1192                 if (!cpuid_full) {
1193                         perror("malloc");
1194                         abort();
1195                 }
1196
1197                 /* Need to skip KVM CPUID leaves 0x400000xx */
1198                 for (i = 0; i < cpuid_sys->nent; i++) {
1199                         if (cpuid_sys->entries[i].function >= 0x40000000 &&
1200                             cpuid_sys->entries[i].function < 0x40000100)
1201                                 continue;
1202                         cpuid_full->entries[nent] = cpuid_sys->entries[i];
1203                         nent++;
1204                 }
1205
1206                 memcpy(&cpuid_full->entries[nent], cpuid_hv->entries,
1207                        cpuid_hv->nent * sizeof(struct kvm_cpuid_entry2));
1208                 cpuid_full->nent = nent + cpuid_hv->nent;
1209         }
1210
1211         vcpu_init_cpuid(vcpu, cpuid_full);
1212 }
1213
1214 const struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vcpu *vcpu)
1215 {
1216         struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
1217
1218         vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
1219
1220         return cpuid;
1221 }
1222
1223 unsigned long vm_compute_max_gfn(struct kvm_vm *vm)
1224 {
1225         const unsigned long num_ht_pages = 12 << (30 - vm->page_shift); /* 12 GiB */
1226         unsigned long ht_gfn, max_gfn, max_pfn;
1227         uint8_t maxphyaddr;
1228
1229         max_gfn = (1ULL << (vm->pa_bits - vm->page_shift)) - 1;
1230
1231         /* Avoid reserved HyperTransport region on AMD processors.  */
1232         if (!host_cpu_is_amd)
1233                 return max_gfn;
1234
1235         /* On parts with <40 physical address bits, the area is fully hidden */
1236         if (vm->pa_bits < 40)
1237                 return max_gfn;
1238
1239         /* Before family 17h, the HyperTransport area is just below 1T.  */
1240         ht_gfn = (1 << 28) - num_ht_pages;
1241         if (this_cpu_family() < 0x17)
1242                 goto done;
1243
1244         /*
1245          * Otherwise it's at the top of the physical address space, possibly
1246          * reduced due to SME by bits 11:6 of CPUID[0x8000001f].EBX.  Use
1247          * the old conservative value if MAXPHYADDR is not enumerated.
1248          */
1249         if (!this_cpu_has_p(X86_PROPERTY_MAX_PHY_ADDR))
1250                 goto done;
1251
1252         maxphyaddr = this_cpu_property(X86_PROPERTY_MAX_PHY_ADDR);
1253         max_pfn = (1ULL << (maxphyaddr - vm->page_shift)) - 1;
1254
1255         if (this_cpu_has_p(X86_PROPERTY_PHYS_ADDR_REDUCTION))
1256                 max_pfn >>= this_cpu_property(X86_PROPERTY_PHYS_ADDR_REDUCTION);
1257
1258         ht_gfn = max_pfn - num_ht_pages;
1259 done:
1260         return min(max_gfn, ht_gfn - 1);
1261 }
1262
1263 /* Returns true if kvm_intel was loaded with unrestricted_guest=1. */
1264 bool vm_is_unrestricted_guest(struct kvm_vm *vm)
1265 {
1266         /* Ensure that a KVM vendor-specific module is loaded. */
1267         if (vm == NULL)
1268                 close(open_kvm_dev_path_or_exit());
1269
1270         return get_kvm_intel_param_bool("unrestricted_guest");
1271 }
1272
1273 void kvm_selftest_arch_init(void)
1274 {
1275         host_cpu_is_intel = this_cpu_is_intel();
1276         host_cpu_is_amd = this_cpu_is_amd();
1277 }