x86.c 24.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443
/*
 * tools/testing/selftests/kvm/lib/x86.c
 *
 * Copyright (C) 2018, Google LLC.
 *
 * This work is licensed under the terms of the GNU GPL, version 2.
 */

#define _GNU_SOURCE /* for program_invocation_name */

#include "test_util.h"
#include "kvm_util.h"
#include "kvm_util_internal.h"
#include "x86.h"

/* Minimum physical address used for virtual translation tables. */
#define KVM_GUEST_PAGE_TABLE_MIN_PADDR 0x180000

/* Virtual translation table structure declarations */
struct pageMapL4Entry {
	uint64_t present:1;
	uint64_t writable:1;
	uint64_t user:1;
	uint64_t write_through:1;
	uint64_t cache_disable:1;
	uint64_t accessed:1;
	uint64_t ignored_06:1;
	uint64_t page_size:1;
	uint64_t ignored_11_08:4;
	uint64_t address:40;
	uint64_t ignored_62_52:11;
	uint64_t execute_disable:1;
};

struct pageDirectoryPointerEntry {
	uint64_t present:1;
	uint64_t writable:1;
	uint64_t user:1;
	uint64_t write_through:1;
	uint64_t cache_disable:1;
	uint64_t accessed:1;
	uint64_t ignored_06:1;
	uint64_t page_size:1;
	uint64_t ignored_11_08:4;
	uint64_t address:40;
	uint64_t ignored_62_52:11;
	uint64_t execute_disable:1;
};

struct pageDirectoryEntry {
	uint64_t present:1;
	uint64_t writable:1;
	uint64_t user:1;
	uint64_t write_through:1;
	uint64_t cache_disable:1;
	uint64_t accessed:1;
	uint64_t ignored_06:1;
	uint64_t page_size:1;
	uint64_t ignored_11_08:4;
	uint64_t address:40;
	uint64_t ignored_62_52:11;
	uint64_t execute_disable:1;
};

struct pageTableEntry {
	uint64_t present:1;
	uint64_t writable:1;
	uint64_t user:1;
	uint64_t write_through:1;
	uint64_t cache_disable:1;
	uint64_t accessed:1;
	uint64_t dirty:1;
	uint64_t reserved_07:1;
	uint64_t global:1;
	uint64_t ignored_11_09:3;
	uint64_t address:40;
	uint64_t ignored_62_52:11;
	uint64_t execute_disable:1;
};

/* Register Dump
 *
 * Input Args:
 *   indent - Left margin indent amount
 *   regs - register
 *
 * Output Args:
 *   stream - Output FILE stream
 *
 * Return: None
 *
 * Dumps the state of the registers given by regs, to the FILE stream
 * given by steam.
 */
void regs_dump(FILE *stream, struct kvm_regs *regs,
	       uint8_t indent)
{
	fprintf(stream, "%*srax: 0x%.16llx rbx: 0x%.16llx "
		"rcx: 0x%.16llx rdx: 0x%.16llx\n",
		indent, "",
		regs->rax, regs->rbx, regs->rcx, regs->rdx);
	fprintf(stream, "%*srsi: 0x%.16llx rdi: 0x%.16llx "
		"rsp: 0x%.16llx rbp: 0x%.16llx\n",
		indent, "",
		regs->rsi, regs->rdi, regs->rsp, regs->rbp);
	fprintf(stream, "%*sr8:  0x%.16llx r9:  0x%.16llx "
		"r10: 0x%.16llx r11: 0x%.16llx\n",
		indent, "",
		regs->r8, regs->r9, regs->r10, regs->r11);
	fprintf(stream, "%*sr12: 0x%.16llx r13: 0x%.16llx "
		"r14: 0x%.16llx r15: 0x%.16llx\n",
		indent, "",
		regs->r12, regs->r13, regs->r14, regs->r15);
	fprintf(stream, "%*srip: 0x%.16llx rfl: 0x%.16llx\n",
		indent, "",
		regs->rip, regs->rflags);
}

/* Segment Dump
 *
 * Input Args:
 *   indent - Left margin indent amount
 *   segment - KVM segment
 *
 * Output Args:
 *   stream - Output FILE stream
 *
 * Return: None
 *
 * Dumps the state of the KVM segment given by segment, to the FILE stream
 * given by steam.
 */
static void segment_dump(FILE *stream, struct kvm_segment *segment,
			 uint8_t indent)
{
	fprintf(stream, "%*sbase: 0x%.16llx limit: 0x%.8x "
		"selector: 0x%.4x type: 0x%.2x\n",
		indent, "", segment->base, segment->limit,
		segment->selector, segment->type);
	fprintf(stream, "%*spresent: 0x%.2x dpl: 0x%.2x "
		"db: 0x%.2x s: 0x%.2x l: 0x%.2x\n",
		indent, "", segment->present, segment->dpl,
		segment->db, segment->s, segment->l);
	fprintf(stream, "%*sg: 0x%.2x avl: 0x%.2x "
		"unusable: 0x%.2x padding: 0x%.2x\n",
		indent, "", segment->g, segment->avl,
		segment->unusable, segment->padding);
}

/* dtable Dump
 *
 * Input Args:
 *   indent - Left margin indent amount
 *   dtable - KVM dtable
 *
 * Output Args:
 *   stream - Output FILE stream
 *
 * Return: None
 *
 * Dumps the state of the KVM dtable given by dtable, to the FILE stream
 * given by steam.
 */
static void dtable_dump(FILE *stream, struct kvm_dtable *dtable,
			uint8_t indent)
{
	fprintf(stream, "%*sbase: 0x%.16llx limit: 0x%.4x "
		"padding: 0x%.4x 0x%.4x 0x%.4x\n",
		indent, "", dtable->base, dtable->limit,
		dtable->padding[0], dtable->padding[1], dtable->padding[2]);
}

/* System Register Dump
 *
 * Input Args:
 *   indent - Left margin indent amount
 *   sregs - System registers
 *
 * Output Args:
 *   stream - Output FILE stream
 *
 * Return: None
 *
 * Dumps the state of the system registers given by sregs, to the FILE stream
 * given by steam.
 */
void sregs_dump(FILE *stream, struct kvm_sregs *sregs,
		uint8_t indent)
{
	unsigned int i;

	fprintf(stream, "%*scs:\n", indent, "");
	segment_dump(stream, &sregs->cs, indent + 2);
	fprintf(stream, "%*sds:\n", indent, "");
	segment_dump(stream, &sregs->ds, indent + 2);
	fprintf(stream, "%*ses:\n", indent, "");
	segment_dump(stream, &sregs->es, indent + 2);
	fprintf(stream, "%*sfs:\n", indent, "");
	segment_dump(stream, &sregs->fs, indent + 2);
	fprintf(stream, "%*sgs:\n", indent, "");
	segment_dump(stream, &sregs->gs, indent + 2);
	fprintf(stream, "%*sss:\n", indent, "");
	segment_dump(stream, &sregs->ss, indent + 2);
	fprintf(stream, "%*str:\n", indent, "");
	segment_dump(stream, &sregs->tr, indent + 2);
	fprintf(stream, "%*sldt:\n", indent, "");
	segment_dump(stream, &sregs->ldt, indent + 2);

	fprintf(stream, "%*sgdt:\n", indent, "");
	dtable_dump(stream, &sregs->gdt, indent + 2);
	fprintf(stream, "%*sidt:\n", indent, "");
	dtable_dump(stream, &sregs->idt, indent + 2);

	fprintf(stream, "%*scr0: 0x%.16llx cr2: 0x%.16llx "
		"cr3: 0x%.16llx cr4: 0x%.16llx\n",
		indent, "",
		sregs->cr0, sregs->cr2, sregs->cr3, sregs->cr4);
	fprintf(stream, "%*scr8: 0x%.16llx efer: 0x%.16llx "
		"apic_base: 0x%.16llx\n",
		indent, "",
		sregs->cr8, sregs->efer, sregs->apic_base);

	fprintf(stream, "%*sinterrupt_bitmap:\n", indent, "");
	for (i = 0; i < (KVM_NR_INTERRUPTS + 63) / 64; i++) {
		fprintf(stream, "%*s%.16llx\n", indent + 2, "",
			sregs->interrupt_bitmap[i]);
	}
}

void virt_pgd_alloc(struct kvm_vm *vm, uint32_t pgd_memslot)
{
	int rc;

	TEST_ASSERT(vm->mode == VM_MODE_FLAT48PG, "Attempt to use "
		"unknown or unsupported guest mode, mode: 0x%x", vm->mode);

	/* If needed, create page map l4 table. */
	if (!vm->pgd_created) {
		vm_paddr_t paddr = vm_phy_page_alloc(vm,
			KVM_GUEST_PAGE_TABLE_MIN_PADDR, pgd_memslot);
		vm->pgd = paddr;
		vm->pgd_created = true;
	}
}

/* VM Virtual Page Map
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vaddr - VM Virtual Address
 *   paddr - VM Physical Address
 *   pgd_memslot - Memory region slot for new virtual translation tables
 *
 * Output Args: None
 *
 * Return: None
 *
 * Within the VM given by vm, creates a virtual translation for the page
 * starting at vaddr to the page starting at paddr.
 */
void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
	uint32_t pgd_memslot)
{
	uint16_t index[4];
	struct pageMapL4Entry *pml4e;

	TEST_ASSERT(vm->mode == VM_MODE_FLAT48PG, "Attempt to use "
		"unknown or unsupported guest mode, mode: 0x%x", vm->mode);

	TEST_ASSERT((vaddr % vm->page_size) == 0,
		"Virtual address not on page boundary,\n"
		"  vaddr: 0x%lx vm->page_size: 0x%x",
		vaddr, vm->page_size);
	TEST_ASSERT(sparsebit_is_set(vm->vpages_valid,
		(vaddr >> vm->page_shift)),
		"Invalid virtual address, vaddr: 0x%lx",
		vaddr);
	TEST_ASSERT((paddr % vm->page_size) == 0,
		"Physical address not on page boundary,\n"
		"  paddr: 0x%lx vm->page_size: 0x%x",
		paddr, vm->page_size);
	TEST_ASSERT((paddr >> vm->page_shift) <= vm->max_gfn,
		"Physical address beyond beyond maximum supported,\n"
		"  paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
		paddr, vm->max_gfn, vm->page_size);

	index[0] = (vaddr >> 12) & 0x1ffu;
	index[1] = (vaddr >> 21) & 0x1ffu;
	index[2] = (vaddr >> 30) & 0x1ffu;
	index[3] = (vaddr >> 39) & 0x1ffu;

	/* Allocate page directory pointer table if not present. */
	pml4e = addr_gpa2hva(vm, vm->pgd);
	if (!pml4e[index[3]].present) {
		pml4e[index[3]].address = vm_phy_page_alloc(vm,
			KVM_GUEST_PAGE_TABLE_MIN_PADDR, pgd_memslot)
			>> vm->page_shift;
		pml4e[index[3]].writable = true;
		pml4e[index[3]].present = true;
	}

	/* Allocate page directory table if not present. */
	struct pageDirectoryPointerEntry *pdpe;
	pdpe = addr_gpa2hva(vm, pml4e[index[3]].address * vm->page_size);
	if (!pdpe[index[2]].present) {
		pdpe[index[2]].address = vm_phy_page_alloc(vm,
			KVM_GUEST_PAGE_TABLE_MIN_PADDR, pgd_memslot)
			>> vm->page_shift;
		pdpe[index[2]].writable = true;
		pdpe[index[2]].present = true;
	}

	/* Allocate page table if not present. */
	struct pageDirectoryEntry *pde;
	pde = addr_gpa2hva(vm, pdpe[index[2]].address * vm->page_size);
	if (!pde[index[1]].present) {
		pde[index[1]].address = vm_phy_page_alloc(vm,
			KVM_GUEST_PAGE_TABLE_MIN_PADDR, pgd_memslot)
			>> vm->page_shift;
		pde[index[1]].writable = true;
		pde[index[1]].present = true;
	}

	/* Fill in page table entry. */
	struct pageTableEntry *pte;
	pte = addr_gpa2hva(vm, pde[index[1]].address * vm->page_size);
	pte[index[0]].address = paddr >> vm->page_shift;
	pte[index[0]].writable = true;
	pte[index[0]].present = 1;
}

/* Virtual Translation Tables Dump
 *
 * Input Args:
 *   vm - Virtual Machine
 *   indent - Left margin indent amount
 *
 * Output Args:
 *   stream - Output FILE stream
 *
 * Return: None
 *
 * Dumps to the FILE stream given by stream, the contents of all the
 * virtual translation tables for the VM given by vm.
 */
void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
{
	struct pageMapL4Entry *pml4e, *pml4e_start;
	struct pageDirectoryPointerEntry *pdpe, *pdpe_start;
	struct pageDirectoryEntry *pde, *pde_start;
	struct pageTableEntry *pte, *pte_start;

	if (!vm->pgd_created)
		return;

	fprintf(stream, "%*s                                          "
		"                no\n", indent, "");
	fprintf(stream, "%*s      index hvaddr         gpaddr         "
		"addr         w exec dirty\n",
		indent, "");
	pml4e_start = (struct pageMapL4Entry *) addr_gpa2hva(vm,
		vm->pgd);
	for (uint16_t n1 = 0; n1 <= 0x1ffu; n1++) {
		pml4e = &pml4e_start[n1];
		if (!pml4e->present)
			continue;
		fprintf(stream, "%*spml4e 0x%-3zx %p 0x%-12lx 0x%-10lx %u "
			" %u\n",
			indent, "",
			pml4e - pml4e_start, pml4e,
			addr_hva2gpa(vm, pml4e), (uint64_t) pml4e->address,
			pml4e->writable, pml4e->execute_disable);

		pdpe_start = addr_gpa2hva(vm, pml4e->address
			* vm->page_size);
		for (uint16_t n2 = 0; n2 <= 0x1ffu; n2++) {
			pdpe = &pdpe_start[n2];
			if (!pdpe->present)
				continue;
			fprintf(stream, "%*spdpe  0x%-3zx %p 0x%-12lx 0x%-10lx "
				"%u  %u\n",
				indent, "",
				pdpe - pdpe_start, pdpe,
				addr_hva2gpa(vm, pdpe),
				(uint64_t) pdpe->address, pdpe->writable,
				pdpe->execute_disable);

			pde_start = addr_gpa2hva(vm,
				pdpe->address * vm->page_size);
			for (uint16_t n3 = 0; n3 <= 0x1ffu; n3++) {
				pde = &pde_start[n3];
				if (!pde->present)
					continue;
				fprintf(stream, "%*spde   0x%-3zx %p "
					"0x%-12lx 0x%-10lx %u  %u\n",
					indent, "", pde - pde_start, pde,
					addr_hva2gpa(vm, pde),
					(uint64_t) pde->address, pde->writable,
					pde->execute_disable);

				pte_start = addr_gpa2hva(vm,
					pde->address * vm->page_size);
				for (uint16_t n4 = 0; n4 <= 0x1ffu; n4++) {
					pte = &pte_start[n4];
					if (!pte->present)
						continue;
					fprintf(stream, "%*spte   0x%-3zx %p "
						"0x%-12lx 0x%-10lx %u  %u "
						"    %u    0x%-10lx\n",
						indent, "",
						pte - pte_start, pte,
						addr_hva2gpa(vm, pte),
						(uint64_t) pte->address,
						pte->writable,
						pte->execute_disable,
						pte->dirty,
						((uint64_t) n1 << 27)
							| ((uint64_t) n2 << 18)
							| ((uint64_t) n3 << 9)
							| ((uint64_t) n4));
				}
			}
		}
	}
}

/* Set Unusable Segment
 *
 * Input Args: None
 *
 * Output Args:
 *   segp - Pointer to segment register
 *
 * Return: None
 *
 * Sets the segment register pointed to by segp to an unusable state.
 */
static void kvm_seg_set_unusable(struct kvm_segment *segp)
{
	memset(segp, 0, sizeof(*segp));
	segp->unusable = true;
}

444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465
static void kvm_seg_fill_gdt_64bit(struct kvm_vm *vm, struct kvm_segment *segp)
{
	void *gdt = addr_gva2hva(vm, vm->gdt);
	struct desc64 *desc = gdt + (segp->selector >> 3) * 8;

	desc->limit0 = segp->limit & 0xFFFF;
	desc->base0 = segp->base & 0xFFFF;
	desc->base1 = segp->base >> 16;
	desc->s = segp->s;
	desc->type = segp->type;
	desc->dpl = segp->dpl;
	desc->p = segp->present;
	desc->limit1 = segp->limit >> 16;
	desc->l = segp->l;
	desc->db = segp->db;
	desc->g = segp->g;
	desc->base2 = segp->base >> 24;
	if (!segp->s)
		desc->base3 = segp->base >> 32;
}


466 467 468
/* Set Long Mode Flat Kernel Code Segment
 *
 * Input Args:
469
 *   vm - VM whose GDT is being filled, or NULL to only write segp
470 471 472 473 474 475 476 477 478 479
 *   selector - selector value
 *
 * Output Args:
 *   segp - Pointer to KVM segment
 *
 * Return: None
 *
 * Sets up the KVM segment pointed to by segp, to be a code segment
 * with the selector value given by selector.
 */
480
static void kvm_seg_set_kernel_code_64bit(struct kvm_vm *vm, uint16_t selector,
481 482 483 484 485 486 487 488 489 490 491 492
	struct kvm_segment *segp)
{
	memset(segp, 0, sizeof(*segp));
	segp->selector = selector;
	segp->limit = 0xFFFFFFFFu;
	segp->s = 0x1; /* kTypeCodeData */
	segp->type = 0x08 | 0x01 | 0x02; /* kFlagCode | kFlagCodeAccessed
					  * | kFlagCodeReadable
					  */
	segp->g = true;
	segp->l = true;
	segp->present = 1;
493 494
	if (vm)
		kvm_seg_fill_gdt_64bit(vm, segp);
495 496 497 498 499
}

/* Set Long Mode Flat Kernel Data Segment
 *
 * Input Args:
500
 *   vm - VM whose GDT is being filled, or NULL to only write segp
501 502 503 504 505 506 507 508 509 510
 *   selector - selector value
 *
 * Output Args:
 *   segp - Pointer to KVM segment
 *
 * Return: None
 *
 * Sets up the KVM segment pointed to by segp, to be a data segment
 * with the selector value given by selector.
 */
511
static void kvm_seg_set_kernel_data_64bit(struct kvm_vm *vm, uint16_t selector,
512 513 514 515 516 517 518 519 520 521 522
	struct kvm_segment *segp)
{
	memset(segp, 0, sizeof(*segp));
	segp->selector = selector;
	segp->limit = 0xFFFFFFFFu;
	segp->s = 0x1; /* kTypeCodeData */
	segp->type = 0x00 | 0x01 | 0x02; /* kFlagData | kFlagDataAccessed
					  * | kFlagDataWritable
					  */
	segp->g = true;
	segp->present = true;
523 524
	if (vm)
		kvm_seg_fill_gdt_64bit(vm, segp);
525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586
}

/* Address Guest Virtual to Guest Physical
 *
 * Input Args:
 *   vm - Virtual Machine
 *   gpa - VM virtual address
 *
 * Output Args: None
 *
 * Return:
 *   Equivalent VM physical address
 *
 * Translates the VM virtual address given by gva to a VM physical
 * address and then locates the memory region containing the VM
 * physical address, within the VM given by vm.  When found, the host
 * virtual address providing the memory to the vm physical address is returned.
 * A TEST_ASSERT failure occurs if no region containing translated
 * VM virtual address exists.
 */
vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
{
	uint16_t index[4];
	struct pageMapL4Entry *pml4e;
	struct pageDirectoryPointerEntry *pdpe;
	struct pageDirectoryEntry *pde;
	struct pageTableEntry *pte;
	void *hva;

	TEST_ASSERT(vm->mode == VM_MODE_FLAT48PG, "Attempt to use "
		"unknown or unsupported guest mode, mode: 0x%x", vm->mode);

	index[0] = (gva >> 12) & 0x1ffu;
	index[1] = (gva >> 21) & 0x1ffu;
	index[2] = (gva >> 30) & 0x1ffu;
	index[3] = (gva >> 39) & 0x1ffu;

	if (!vm->pgd_created)
		goto unmapped_gva;
	pml4e = addr_gpa2hva(vm, vm->pgd);
	if (!pml4e[index[3]].present)
		goto unmapped_gva;

	pdpe = addr_gpa2hva(vm, pml4e[index[3]].address * vm->page_size);
	if (!pdpe[index[2]].present)
		goto unmapped_gva;

	pde = addr_gpa2hva(vm, pdpe[index[2]].address * vm->page_size);
	if (!pde[index[1]].present)
		goto unmapped_gva;

	pte = addr_gpa2hva(vm, pde[index[1]].address * vm->page_size);
	if (!pte[index[0]].present)
		goto unmapped_gva;

	return (pte[index[0]].address * vm->page_size) + (gva & 0xfffu);

unmapped_gva:
	TEST_ASSERT(false, "No mapping for vm virtual address, "
		    "gva: 0x%lx", gva);
}

587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615
static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt, int gdt_memslot,
			  int pgd_memslot)
{
	if (!vm->gdt)
		vm->gdt = vm_vaddr_alloc(vm, getpagesize(),
			KVM_UTIL_MIN_VADDR, gdt_memslot, pgd_memslot);

	dt->base = vm->gdt;
	dt->limit = getpagesize();
}

static void kvm_setup_tss_64bit(struct kvm_vm *vm, struct kvm_segment *segp,
				int selector, int gdt_memslot,
				int pgd_memslot)
{
	if (!vm->tss)
		vm->tss = vm_vaddr_alloc(vm, getpagesize(),
			KVM_UTIL_MIN_VADDR, gdt_memslot, pgd_memslot);

	memset(segp, 0, sizeof(*segp));
	segp->base = vm->tss;
	segp->limit = 0x67;
	segp->selector = selector;
	segp->type = 0xb;
	segp->present = 1;
	kvm_seg_fill_gdt_64bit(vm, segp);
}

void vcpu_setup(struct kvm_vm *vm, int vcpuid, int pgd_memslot, int gdt_memslot)
616 617 618 619 620 621
{
	struct kvm_sregs sregs;

	/* Set mode specific system register values. */
	vcpu_sregs_get(vm, vcpuid, &sregs);

622 623 624 625
	sregs.idt.limit = 0;

	kvm_setup_gdt(vm, &sregs.gdt, gdt_memslot, pgd_memslot);

626 627 628 629 630 631 632
	switch (vm->mode) {
	case VM_MODE_FLAT48PG:
		sregs.cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG;
		sregs.cr4 |= X86_CR4_PAE;
		sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX);

		kvm_seg_set_unusable(&sregs.ldt);
633 634 635 636
		kvm_seg_set_kernel_code_64bit(vm, 0x8, &sregs.cs);
		kvm_seg_set_kernel_data_64bit(vm, 0x10, &sregs.ds);
		kvm_seg_set_kernel_data_64bit(vm, 0x10, &sregs.es);
		kvm_setup_tss_64bit(vm, &sregs.tr, 0x18, gdt_memslot, pgd_memslot);
637 638 639 640 641 642
		break;

	default:
		TEST_ASSERT(false, "Unknown guest mode, mode: 0x%x", vm->mode);
	}

643 644
	sregs.cr3 = vm->pgd;
	vcpu_sregs_set(vm, vcpuid, &sregs);
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660
}
/* Adds a vCPU with reasonable defaults (i.e., a stack)
 *
 * Input Args:
 *   vcpuid - The id of the VCPU to add to the VM.
 *   guest_code - The vCPU's entry point
 */
void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
{
	struct kvm_mp_state mp_state;
	struct kvm_regs regs;
	vm_vaddr_t stack_vaddr;
	stack_vaddr = vm_vaddr_alloc(vm, DEFAULT_STACK_PGS * getpagesize(),
				     DEFAULT_GUEST_STACK_VADDR_MIN, 0, 0);

	/* Create VCPU */
661
	vm_vcpu_add(vm, vcpuid, 0, 0);
662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704

	/* Setup guest general purpose registers */
	vcpu_regs_get(vm, vcpuid, &regs);
	regs.rflags = regs.rflags | 0x2;
	regs.rsp = stack_vaddr + (DEFAULT_STACK_PGS * getpagesize());
	regs.rip = (unsigned long) guest_code;
	vcpu_regs_set(vm, vcpuid, &regs);

	/* Setup the MP state */
	mp_state.mp_state = 0;
	vcpu_set_mp_state(vm, vcpuid, &mp_state);
}

/* VM VCPU CPUID Set
 *
 * Input Args:
 *   vm - Virtual Machine
 *   vcpuid - VCPU id
 *   cpuid - The CPUID values to set.
 *
 * Output Args: None
 *
 * Return: void
 *
 * Set the VCPU's CPUID.
 */
void vcpu_set_cpuid(struct kvm_vm *vm,
		uint32_t vcpuid, struct kvm_cpuid2 *cpuid)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int rc;

	TEST_ASSERT(vcpu != NULL, "vcpu not found, vcpuid: %u", vcpuid);

	rc = ioctl(vcpu->fd, KVM_SET_CPUID2, cpuid);
	TEST_ASSERT(rc == 0, "KVM_SET_CPUID2 failed, rc: %i errno: %i",
		    rc, errno);

}
/* Create a VM with reasonable defaults
 *
 * Input Args:
 *   vcpuid - The id of the single VCPU to add to the VM.
705 706 707
 *   extra_mem_pages - The size of extra memories to add (this will
 *                     decide how much extra space we will need to
 *                     setup the page tables using mem slot 0)
708 709 710 711 712 713 714
 *   guest_code - The vCPU's entry point
 *
 * Output Args: None
 *
 * Return:
 *   Pointer to opaque structure that describes the created VM.
 */
715 716
struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages,
				 void *guest_code)
717 718
{
	struct kvm_vm *vm;
719 720 721 722 723 724 725 726
	/*
	 * For x86 the maximum page table size for a memory region
	 * will be when only 4K pages are used.  In that case the
	 * total extra size for page tables (for extra N pages) will
	 * be: N/512+N/512^2+N/512^3+... which is definitely smaller
	 * than N/512*2.
	 */
	uint64_t extra_pg_pages = extra_mem_pages / 512 * 2;
727 728

	/* Create VM */
729 730 731
	vm = vm_create(VM_MODE_FLAT48PG,
		       DEFAULT_GUEST_PHY_PAGES + extra_pg_pages,
		       O_RDWR);
732

733 734 735
	/* Setup guest code */
	kvm_vm_elf_load(vm, program_invocation_name, 0, 0);

736 737 738 739 740 741 742 743
	/* Setup IRQ Chip */
	vm_create_irqchip(vm);

	/* Add the first vCPU. */
	vm_vcpu_add_default(vm, vcpuid, guest_code);

	return vm;
}
744 745 746 747 748 749 750 751 752

struct kvm_x86_state {
	struct kvm_vcpu_events events;
	struct kvm_mp_state mp_state;
	struct kvm_regs regs;
	struct kvm_xsave xsave;
	struct kvm_xcrs xcrs;
	struct kvm_sregs sregs;
	struct kvm_debugregs debugregs;
753 754 755 756
	union {
		struct kvm_nested_state nested;
		char nested_[16384];
	};
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778
	struct kvm_msrs msrs;
};

static int kvm_get_num_msrs(struct kvm_vm *vm)
{
	struct kvm_msr_list nmsrs;
	int r;

	nmsrs.nmsrs = 0;
	r = ioctl(vm->kvm_fd, KVM_GET_MSR_INDEX_LIST, &nmsrs);
	TEST_ASSERT(r == -1 && errno == E2BIG, "Unexpected result from KVM_GET_MSR_INDEX_LIST probe, r: %i",
		r);

	return nmsrs.nmsrs;
}

struct kvm_x86_state *vcpu_save_state(struct kvm_vm *vm, uint32_t vcpuid)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	struct kvm_msr_list *list;
	struct kvm_x86_state *state;
	int nmsrs, r, i;
779 780 781 782 783 784 785 786
	static int nested_size = -1;

	if (nested_size == -1) {
		nested_size = kvm_check_cap(KVM_CAP_NESTED_STATE);
		TEST_ASSERT(nested_size <= sizeof(state->nested_),
			    "Nested state size too big, %i > %zi",
			    nested_size, sizeof(state->nested_));
	}
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819

	nmsrs = kvm_get_num_msrs(vm);
	list = malloc(sizeof(*list) + nmsrs * sizeof(list->indices[0]));
	list->nmsrs = nmsrs;
	r = ioctl(vm->kvm_fd, KVM_GET_MSR_INDEX_LIST, list);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_MSR_INDEX_LIST, r: %i",
                r);

	state = malloc(sizeof(*state) + nmsrs * sizeof(state->msrs.entries[0]));
	r = ioctl(vcpu->fd, KVM_GET_VCPU_EVENTS, &state->events);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_VCPU_EVENTS, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_GET_MP_STATE, &state->mp_state);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_MP_STATE, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_GET_REGS, &state->regs);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_REGS, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_GET_XSAVE, &state->xsave);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_XSAVE, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_GET_XCRS, &state->xcrs);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_XCRS, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_GET_SREGS, &state->sregs);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_SREGS, r: %i",
                r);

820 821 822 823 824 825 826 827 828 829 830
	if (nested_size) {
		state->nested.size = sizeof(state->nested_);
		r = ioctl(vcpu->fd, KVM_GET_NESTED_STATE, &state->nested);
		TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_NESTED_STATE, r: %i",
			r);
		TEST_ASSERT(state->nested.size <= nested_size,
			"Nested state size too big, %i (KVM_CHECK_CAP gave %i)",
			state->nested.size, nested_size);
	} else
		state->nested.size = 0;

831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850
	state->msrs.nmsrs = nmsrs;
	for (i = 0; i < nmsrs; i++)
		state->msrs.entries[i].index = list->indices[i];
	r = ioctl(vcpu->fd, KVM_GET_MSRS, &state->msrs);
        TEST_ASSERT(r == nmsrs, "Unexpected result from KVM_GET_MSRS, r: %i (failed at %x)",
                r, r == nmsrs ? -1 : list->indices[r]);

	r = ioctl(vcpu->fd, KVM_GET_DEBUGREGS, &state->debugregs);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_GET_DEBUGREGS, r: %i",
                r);

	free(list);
	return state;
}

void vcpu_load_state(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_x86_state *state)
{
	struct vcpu *vcpu = vcpu_find(vm, vcpuid);
	int r;

851 852 853 854 855 856
	if (state->nested.size) {
		r = ioctl(vcpu->fd, KVM_SET_NESTED_STATE, &state->nested);
		TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_NESTED_STATE, r: %i",
			r);
	}

857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888
	r = ioctl(vcpu->fd, KVM_SET_XSAVE, &state->xsave);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_XSAVE, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_SET_XCRS, &state->xcrs);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_XCRS, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_SET_SREGS, &state->sregs);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_SREGS, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_SET_MSRS, &state->msrs);
        TEST_ASSERT(r == state->msrs.nmsrs, "Unexpected result from KVM_SET_MSRS, r: %i (failed at %x)",
                r, r == state->msrs.nmsrs ? -1 : state->msrs.entries[r].index);

	r = ioctl(vcpu->fd, KVM_SET_VCPU_EVENTS, &state->events);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_VCPU_EVENTS, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_SET_MP_STATE, &state->mp_state);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_MP_STATE, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_SET_DEBUGREGS, &state->debugregs);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_DEBUGREGS, r: %i",
                r);

	r = ioctl(vcpu->fd, KVM_SET_REGS, &state->regs);
        TEST_ASSERT(r == 0, "Unexpected result from KVM_SET_REGS, r: %i",
                r);
}