tools/testing/selftests/kvm/x86_64/sync_regs_test.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Test for x86 KVM_CAP_SYNC_REGS
  *
  * Copyright (C) 2018, Google LLC.
  *
  * Verifies expected behavior of x86 KVM_CAP_SYNC_REGS functionality,
  * including requesting an invalid register set, updates to/from values
  * in kvm_run.s.regs when kvm_valid_regs and kvm_dirty_regs are toggled.
  */

 #define _GNU_SOURCE /* for program_invocation_short_name */
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>

 #include "test_util.h"
 #include "kvm_util.h"
 #include "processor.h"

 #define VCPU_ID 5

 #define UCALL_PIO_PORT ((uint16_t)0x1000)

 /*
  * ucall is embedded here to protect against compiler reshuffling registers
  * before calling a function. In this test we only need to get KVM_EXIT_IO
  * vmexit and preserve RBX, no additional information is needed.
  */
 void guest_code(void)
 {
 	asm volatile("1: in %[port], %%al\n"
 		     "add $0x1, %%rbx\n"
 		     "jmp 1b"
 		     : : [port] "d" (UCALL_PIO_PORT) : "rax", "rbx");
 }

 static void compare_regs(struct kvm_regs *left, struct kvm_regs *right)
 {
 #define REG_COMPARE(reg) \
 	TEST_ASSERT(left->reg == right->reg, \
 		    "Register " #reg \
 		    " values did not match: 0x%llx, 0x%llx\n", \
 		    left->reg, right->reg)
 	REG_COMPARE(rax);
 	REG_COMPARE(rbx);
 	REG_COMPARE(rcx);
 	REG_COMPARE(rdx);
 	REG_COMPARE(rsi);
 	REG_COMPARE(rdi);
 	REG_COMPARE(rsp);
 	REG_COMPARE(rbp);
 	REG_COMPARE(r8);
 	REG_COMPARE(r9);
 	REG_COMPARE(r10);
 	REG_COMPARE(r11);
 	REG_COMPARE(r12);
 	REG_COMPARE(r13);
 	REG_COMPARE(r14);
 	REG_COMPARE(r15);
 	REG_COMPARE(rip);
 	REG_COMPARE(rflags);
 #undef REG_COMPARE
 }

 static void compare_sregs(struct kvm_sregs *left, struct kvm_sregs *right)
 {
 }

 static void compare_vcpu_events(struct kvm_vcpu_events *left,
 				struct kvm_vcpu_events *right)
 {
 }

 #define TEST_SYNC_FIELDS   (KVM_SYNC_X86_REGS|KVM_SYNC_X86_SREGS|KVM_SYNC_X86_EVENTS)
 #define INVALID_SYNC_FIELD 0x80000000

 int main(int argc, char *argv[])
 {
 	struct kvm_vm *vm;
 	struct kvm_run *run;
 	struct kvm_regs regs;
 	struct kvm_sregs sregs;
 	struct kvm_vcpu_events events;
 	int rv, cap;

 	/* Tell stdout not to buffer its content */
 	setbuf(stdout, NULL);

 	cap = kvm_check_cap(KVM_CAP_SYNC_REGS);
 	if ((cap & TEST_SYNC_FIELDS) != TEST_SYNC_FIELDS) {
 		print_skip("KVM_CAP_SYNC_REGS not supported");
 		exit(KSFT_SKIP);
 	}
 	if ((cap & INVALID_SYNC_FIELD) != 0) {
 		print_skip("The \"invalid\" field is not invalid");
 		exit(KSFT_SKIP);
 	}

 	/* Create VM */
 	vm = vm_create_default(VCPU_ID, 0, guest_code);

 	run = vcpu_state(vm, VCPU_ID);

 	/* Request reading invalid register set from VCPU. */
 	run->kvm_valid_regs = INVALID_SYNC_FIELD;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(rv < 0 && errno == EINVAL,
 		    "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
 		    rv);
 	vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;

 	run->kvm_valid_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(rv < 0 && errno == EINVAL,
 		    "Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
 		    rv);
 	vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;

 	/* Request setting invalid register set into VCPU. */
 	run->kvm_dirty_regs = INVALID_SYNC_FIELD;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(rv < 0 && errno == EINVAL,
 		    "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
 		    rv);
 	vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;

 	run->kvm_dirty_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(rv < 0 && errno == EINVAL,
 		    "Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
 		    rv);
 	vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;

 	/* Request and verify all valid register sets. */
 	/* TODO: BUILD TIME CHECK: TEST_ASSERT(KVM_SYNC_X86_NUM_FIELDS != 3); */
 	run->kvm_valid_regs = TEST_SYNC_FIELDS;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 		    "Unexpected exit reason: %u (%s),\n",
 		    run->exit_reason,
 		    exit_reason_str(run->exit_reason));

 	vcpu_regs_get(vm, VCPU_ID, &regs);
 	compare_regs(&regs, &run->s.regs.regs);

 	vcpu_sregs_get(vm, VCPU_ID, &sregs);
 	compare_sregs(&sregs, &run->s.regs.sregs);

 	vcpu_events_get(vm, VCPU_ID, &events);
 	compare_vcpu_events(&events, &run->s.regs.events);

 	/* Set and verify various register values. */
 	run->s.regs.regs.rbx = 0xBAD1DEA;
 	run->s.regs.sregs.apic_base = 1 << 11;
 	/* TODO run->s.regs.events.XYZ = ABC; */

 	run->kvm_valid_regs = TEST_SYNC_FIELDS;
 	run->kvm_dirty_regs = KVM_SYNC_X86_REGS | KVM_SYNC_X86_SREGS;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 		    "Unexpected exit reason: %u (%s),\n",
 		    run->exit_reason,
 		    exit_reason_str(run->exit_reason));
 	TEST_ASSERT(run->s.regs.regs.rbx == 0xBAD1DEA + 1,
 		    "rbx sync regs value incorrect 0x%llx.",
 		    run->s.regs.regs.rbx);
 	TEST_ASSERT(run->s.regs.sregs.apic_base == 1 << 11,
 		    "apic_base sync regs value incorrect 0x%llx.",
 		    run->s.regs.sregs.apic_base);

 	vcpu_regs_get(vm, VCPU_ID, &regs);
 	compare_regs(&regs, &run->s.regs.regs);

 	vcpu_sregs_get(vm, VCPU_ID, &sregs);
 	compare_sregs(&sregs, &run->s.regs.sregs);

 	vcpu_events_get(vm, VCPU_ID, &events);
 	compare_vcpu_events(&events, &run->s.regs.events);

 	/* Clear kvm_dirty_regs bits, verify new s.regs values are
 	 * overwritten with existing guest values.
 	 */
 	run->kvm_valid_regs = TEST_SYNC_FIELDS;
 	run->kvm_dirty_regs = 0;
 	run->s.regs.regs.rbx = 0xDEADBEEF;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 		    "Unexpected exit reason: %u (%s),\n",
 		    run->exit_reason,
 		    exit_reason_str(run->exit_reason));
 	TEST_ASSERT(run->s.regs.regs.rbx != 0xDEADBEEF,
 		    "rbx sync regs value incorrect 0x%llx.",
 		    run->s.regs.regs.rbx);

 	/* Clear kvm_valid_regs bits and kvm_dirty_bits.
 	 * Verify s.regs values are not overwritten with existing guest values
 	 * and that guest values are not overwritten with kvm_sync_regs values.
 	 */
 	run->kvm_valid_regs = 0;
 	run->kvm_dirty_regs = 0;
 	run->s.regs.regs.rbx = 0xAAAA;
 	regs.rbx = 0xBAC0;
 	vcpu_regs_set(vm, VCPU_ID, &regs);
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 		    "Unexpected exit reason: %u (%s),\n",
 		    run->exit_reason,
 		    exit_reason_str(run->exit_reason));
 	TEST_ASSERT(run->s.regs.regs.rbx == 0xAAAA,
 		    "rbx sync regs value incorrect 0x%llx.",
 		    run->s.regs.regs.rbx);
 	vcpu_regs_get(vm, VCPU_ID, &regs);
 	TEST_ASSERT(regs.rbx == 0xBAC0 + 1,
 		    "rbx guest value incorrect 0x%llx.",
 		    regs.rbx);

 	/* Clear kvm_valid_regs bits. Verify s.regs values are not overwritten
 	 * with existing guest values but that guest values are overwritten
 	 * with kvm_sync_regs values.
 	 */
 	run->kvm_valid_regs = 0;
 	run->kvm_dirty_regs = TEST_SYNC_FIELDS;
 	run->s.regs.regs.rbx = 0xBBBB;
 	rv = _vcpu_run(vm, VCPU_ID);
 	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 		    "Unexpected exit reason: %u (%s),\n",
 		    run->exit_reason,
 		    exit_reason_str(run->exit_reason));
 	TEST_ASSERT(run->s.regs.regs.rbx == 0xBBBB,
 		    "rbx sync regs value incorrect 0x%llx.",
 		    run->s.regs.regs.rbx);
 	vcpu_regs_get(vm, VCPU_ID, &regs);
 	TEST_ASSERT(regs.rbx == 0xBBBB + 1,
 		    "rbx guest value incorrect 0x%llx.",
 		    regs.rbx);

 	kvm_vm_free(vm);

 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Test for x86 KVM_CAP_SYNC_REGS
	*
	* Copyright (C) 2018, Google LLC.
	*
	* Verifies expected behavior of x86 KVM_CAP_SYNC_REGS functionality,
	* including requesting an invalid register set, updates to/from values
	* in kvm_run.s.regs when kvm_valid_regs and kvm_dirty_regs are toggled.
	*/

	#define _GNU_SOURCE /* for program_invocation_short_name */
	#include <fcntl.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/ioctl.h>

	#include "test_util.h"
	#include "kvm_util.h"
	#include "processor.h"

	#define VCPU_ID 5

	#define UCALL_PIO_PORT ((uint16_t)0x1000)

	/*
	* ucall is embedded here to protect against compiler reshuffling registers
	* before calling a function. In this test we only need to get KVM_EXIT_IO
	* vmexit and preserve RBX, no additional information is needed.
	*/
	void guest_code(void)
	{
	asm volatile("1: in %[port], %%al\n"
	"add $0x1, %%rbx\n"
	"jmp 1b"
	: : [port] "d" (UCALL_PIO_PORT) : "rax", "rbx");
	}

	static void compare_regs(struct kvm_regs left, struct kvm_regs right)
	{
	#define REG_COMPARE(reg) \
	TEST_ASSERT(left->reg == right->reg, \
	"Register " #reg \
	" values did not match: 0x%llx, 0x%llx\n", \
	left->reg, right->reg)
	REG_COMPARE(rax);
	REG_COMPARE(rbx);
	REG_COMPARE(rcx);
	REG_COMPARE(rdx);
	REG_COMPARE(rsi);
	REG_COMPARE(rdi);
	REG_COMPARE(rsp);
	REG_COMPARE(rbp);
	REG_COMPARE(r8);
	REG_COMPARE(r9);
	REG_COMPARE(r10);
	REG_COMPARE(r11);
	REG_COMPARE(r12);
	REG_COMPARE(r13);
	REG_COMPARE(r14);
	REG_COMPARE(r15);
	REG_COMPARE(rip);
	REG_COMPARE(rflags);
	#undef REG_COMPARE
	}

	static void compare_sregs(struct kvm_sregs left, struct kvm_sregs right)
	{
	}

	static void compare_vcpu_events(struct kvm_vcpu_events *left,
	struct kvm_vcpu_events *right)
	{
	}

	#define TEST_SYNC_FIELDS (KVM_SYNC_X86_REGS\|KVM_SYNC_X86_SREGS\|KVM_SYNC_X86_EVENTS)
	#define INVALID_SYNC_FIELD 0x80000000

	int main(int argc, char *argv[])
	{
	struct kvm_vm *vm;
	struct kvm_run *run;
	struct kvm_regs regs;
	struct kvm_sregs sregs;
	struct kvm_vcpu_events events;
	int rv, cap;

	/* Tell stdout not to buffer its content */
	setbuf(stdout, NULL);

	cap = kvm_check_cap(KVM_CAP_SYNC_REGS);
	if ((cap & TEST_SYNC_FIELDS) != TEST_SYNC_FIELDS) {
	print_skip("KVM_CAP_SYNC_REGS not supported");
	exit(KSFT_SKIP);
	}
	if ((cap & INVALID_SYNC_FIELD) != 0) {
	print_skip("The \"invalid\" field is not invalid");
	exit(KSFT_SKIP);
	}

	/* Create VM */
	vm = vm_create_default(VCPU_ID, 0, guest_code);

	run = vcpu_state(vm, VCPU_ID);

	/* Request reading invalid register set from VCPU. */
	run->kvm_valid_regs = INVALID_SYNC_FIELD;
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(rv < 0 && errno == EINVAL,
	"Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
	rv);
	vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;

	run->kvm_valid_regs = INVALID_SYNC_FIELD \| TEST_SYNC_FIELDS;
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(rv < 0 && errno == EINVAL,
	"Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
	rv);
	vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;

	/* Request setting invalid register set into VCPU. */
	run->kvm_dirty_regs = INVALID_SYNC_FIELD;
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(rv < 0 && errno == EINVAL,
	"Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
	rv);
	vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;

	run->kvm_dirty_regs = INVALID_SYNC_FIELD \| TEST_SYNC_FIELDS;
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(rv < 0 && errno == EINVAL,
	"Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
	rv);
	vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;

	/* Request and verify all valid register sets. */
	/* TODO: BUILD TIME CHECK: TEST_ASSERT(KVM_SYNC_X86_NUM_FIELDS != 3); */
	run->kvm_valid_regs = TEST_SYNC_FIELDS;
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
	"Unexpected exit reason: %u (%s),\n",
	run->exit_reason,
	exit_reason_str(run->exit_reason));

	vcpu_regs_get(vm, VCPU_ID, &regs);
	compare_regs(&regs, &run->s.regs.regs);

	vcpu_sregs_get(vm, VCPU_ID, &sregs);
	compare_sregs(&sregs, &run->s.regs.sregs);

	vcpu_events_get(vm, VCPU_ID, &events);
	compare_vcpu_events(&events, &run->s.regs.events);

	/* Set and verify various register values. */
	run->s.regs.regs.rbx = 0xBAD1DEA;
	run->s.regs.sregs.apic_base = 1 << 11;
	/* TODO run->s.regs.events.XYZ = ABC; */

	run->kvm_valid_regs = TEST_SYNC_FIELDS;
	run->kvm_dirty_regs = KVM_SYNC_X86_REGS \| KVM_SYNC_X86_SREGS;
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
	"Unexpected exit reason: %u (%s),\n",
	run->exit_reason,
	exit_reason_str(run->exit_reason));
	TEST_ASSERT(run->s.regs.regs.rbx == 0xBAD1DEA + 1,
	"rbx sync regs value incorrect 0x%llx.",
	run->s.regs.regs.rbx);
	TEST_ASSERT(run->s.regs.sregs.apic_base == 1 << 11,
	"apic_base sync regs value incorrect 0x%llx.",
	run->s.regs.sregs.apic_base);

	vcpu_regs_get(vm, VCPU_ID, &regs);
	compare_regs(&regs, &run->s.regs.regs);

	vcpu_sregs_get(vm, VCPU_ID, &sregs);
	compare_sregs(&sregs, &run->s.regs.sregs);

	vcpu_events_get(vm, VCPU_ID, &events);
	compare_vcpu_events(&events, &run->s.regs.events);

	/* Clear kvm_dirty_regs bits, verify new s.regs values are
	* overwritten with existing guest values.
	*/
	run->kvm_valid_regs = TEST_SYNC_FIELDS;
	run->kvm_dirty_regs = 0;
	run->s.regs.regs.rbx = 0xDEADBEEF;
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
	"Unexpected exit reason: %u (%s),\n",
	run->exit_reason,
	exit_reason_str(run->exit_reason));
	TEST_ASSERT(run->s.regs.regs.rbx != 0xDEADBEEF,
	"rbx sync regs value incorrect 0x%llx.",
	run->s.regs.regs.rbx);

	/* Clear kvm_valid_regs bits and kvm_dirty_bits.
	* Verify s.regs values are not overwritten with existing guest values
	* and that guest values are not overwritten with kvm_sync_regs values.
	*/
	run->kvm_valid_regs = 0;
	run->kvm_dirty_regs = 0;
	run->s.regs.regs.rbx = 0xAAAA;
	regs.rbx = 0xBAC0;
	vcpu_regs_set(vm, VCPU_ID, &regs);
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
	"Unexpected exit reason: %u (%s),\n",
	run->exit_reason,
	exit_reason_str(run->exit_reason));
	TEST_ASSERT(run->s.regs.regs.rbx == 0xAAAA,
	"rbx sync regs value incorrect 0x%llx.",
	run->s.regs.regs.rbx);
	vcpu_regs_get(vm, VCPU_ID, &regs);
	TEST_ASSERT(regs.rbx == 0xBAC0 + 1,
	"rbx guest value incorrect 0x%llx.",
	regs.rbx);

	/* Clear kvm_valid_regs bits. Verify s.regs values are not overwritten
	* with existing guest values but that guest values are overwritten
	* with kvm_sync_regs values.
	*/
	run->kvm_valid_regs = 0;
	run->kvm_dirty_regs = TEST_SYNC_FIELDS;
	run->s.regs.regs.rbx = 0xBBBB;
	rv = _vcpu_run(vm, VCPU_ID);
	TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
	"Unexpected exit reason: %u (%s),\n",
	run->exit_reason,
	exit_reason_str(run->exit_reason));
	TEST_ASSERT(run->s.regs.regs.rbx == 0xBBBB,
	"rbx sync regs value incorrect 0x%llx.",
	run->s.regs.regs.rbx);
	vcpu_regs_get(vm, VCPU_ID, &regs);
	TEST_ASSERT(regs.rbx == 0xBBBB + 1,
	"rbx guest value incorrect 0x%llx.",
	regs.rbx);

	kvm_vm_free(vm);

	return 0;
	}