KVM: selftests: Add KVM_SET_GUEST_DEBUG test (449aa906) · Commits · 戴 / test

tools/testing/selftests/kvm/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
		TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
		TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
		TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
		TEST_GEN_PROGS_x86_64 += x86_64/debug_regs
		TEST_GEN_PROGS_x86_64 += clear_dirty_log_test
		TEST_GEN_PROGS_x86_64 += demand_paging_test
		TEST_GEN_PROGS_x86_64 += dirty_log_test

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

+2 −0

Original line number	Diff line number	Diff line
		@@ -143,6 +143,8 @@ struct kvm_run vcpu_state(struct kvm_vm vm, uint32_t vcpuid);
		void vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
		int _vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
		void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid);
		void vcpu_set_guest_debug(struct kvm_vm *vm, uint32_t vcpuid,
		struct kvm_guest_debug *debug);
		void vcpu_set_mp_state(struct kvm_vm *vm, uint32_t vcpuid,
		struct kvm_mp_state *mp_state);
		void vcpu_regs_get(struct kvm_vm vm, uint32_t vcpuid, struct kvm_regs regs);

tools/testing/selftests/kvm/lib/kvm_util.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -1201,6 +1201,15 @@ void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid)
		ret, errno);
		}

		void vcpu_set_guest_debug(struct kvm_vm *vm, uint32_t vcpuid,
		struct kvm_guest_debug *debug)
		{
		struct vcpu *vcpu = vcpu_find(vm, vcpuid);
		int ret = ioctl(vcpu->fd, KVM_SET_GUEST_DEBUG, debug);

		TEST_ASSERT(ret == 0, "KVM_SET_GUEST_DEBUG failed: %d", ret);
		}

		/*
		* VM VCPU Set MP State
		*

tools/testing/selftests/kvm/x86_64/debug_regs.c

0 → 100644

+180 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* KVM guest debug register tests
		*
		* Copyright (C) 2020, Red Hat, Inc.
		*/
		#include <stdio.h>
		#include <string.h>
		#include "kvm_util.h"
		#include "processor.h"

		#define VCPU_ID 0

		/* For testing data access debug BP */
		uint32_t guest_value;

		extern unsigned char sw_bp, hw_bp, write_data, ss_start;

		static void guest_code(void)
		{
		/*
		* Software BP tests.
		*
		* NOTE: sw_bp need to be before the cmd here, because int3 is an
		* exception rather than a normal trap for KVM_SET_GUEST_DEBUG (we
		* capture it using the vcpu exception bitmap).
		*/
		asm volatile("sw_bp: int3");

		/* Hardware instruction BP test */
		asm volatile("hw_bp: nop");

		/* Hardware data BP test */
		asm volatile("mov $1234,%%rax;\n\t"
		"mov %%rax,%0;\n\t write_data:"
		: "=m" (guest_value) : : "rax");

		/* Single step test, covers 2 basic instructions and 2 emulated */
		asm volatile("ss_start: "
		"xor %%rax,%%rax\n\t"
		"cpuid\n\t"
		"movl $0x1a0,%%ecx\n\t"
		"rdmsr\n\t"
		: : : "rax", "ecx");

		GUEST_DONE();
		}

		#define CLEAR_DEBUG() memset(&debug, 0, sizeof(debug))
		#define APPLY_DEBUG() vcpu_set_guest_debug(vm, VCPU_ID, &debug)
		#define CAST_TO_RIP(v) ((unsigned long long)&(v))
		#define SET_RIP(v) do { \
		vcpu_regs_get(vm, VCPU_ID, &regs); \
		regs.rip = (v); \
		vcpu_regs_set(vm, VCPU_ID, &regs); \
		} while (0)
		#define MOVE_RIP(v) SET_RIP(regs.rip + (v));

		int main(void)
		{
		struct kvm_guest_debug debug;
		unsigned long long target_dr6, target_rip;
		struct kvm_regs regs;
		struct kvm_run *run;
		struct kvm_vm *vm;
		struct ucall uc;
		uint64_t cmd;
		int i;
		/* Instruction lengths starting at ss_start */
		int ss_size[4] = {
		3, /* xor */
		2, /* cpuid */
		5, /* mov */
		2, /* rdmsr */
		};

		if (!kvm_check_cap(KVM_CAP_SET_GUEST_DEBUG)) {
		print_skip("KVM_CAP_SET_GUEST_DEBUG not supported");
		return 0;
		}

		vm = vm_create_default(VCPU_ID, 0, guest_code);
		vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
		run = vcpu_state(vm, VCPU_ID);

		/* Test software BPs - int3 */
		CLEAR_DEBUG();
		debug.control = KVM_GUESTDBG_ENABLE \| KVM_GUESTDBG_USE_SW_BP;
		APPLY_DEBUG();
		vcpu_run(vm, VCPU_ID);
		TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
		run->debug.arch.exception == BP_VECTOR &&
		run->debug.arch.pc == CAST_TO_RIP(sw_bp),
		"INT3: exit %d exception %d rip 0x%llx (should be 0x%llx)",
		run->exit_reason, run->debug.arch.exception,
		run->debug.arch.pc, CAST_TO_RIP(sw_bp));
		MOVE_RIP(1);

		/* Test instruction HW BP over DR[0-3] */
		for (i = 0; i < 4; i++) {
		CLEAR_DEBUG();
		debug.control = KVM_GUESTDBG_ENABLE \| KVM_GUESTDBG_USE_HW_BP;
		debug.arch.debugreg[i] = CAST_TO_RIP(hw_bp);
		debug.arch.debugreg[7] = 0x400 \| (1UL << (2*i+1));
		APPLY_DEBUG();
		vcpu_run(vm, VCPU_ID);
		target_dr6 = 0xffff0ff0 \| (1UL << i);
		TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
		run->debug.arch.exception == DB_VECTOR &&
		run->debug.arch.pc == CAST_TO_RIP(hw_bp) &&
		run->debug.arch.dr6 == target_dr6,
		"INS_HW_BP (DR%d): exit %d exception %d rip 0x%llx "
		"(should be 0x%llx) dr6 0x%llx (should be 0x%llx)",
		i, run->exit_reason, run->debug.arch.exception,
		run->debug.arch.pc, CAST_TO_RIP(hw_bp),
		run->debug.arch.dr6, target_dr6);
		}
		/* Skip "nop" */
		MOVE_RIP(1);

		/* Test data access HW BP over DR[0-3] */
		for (i = 0; i < 4; i++) {
		CLEAR_DEBUG();
		debug.control = KVM_GUESTDBG_ENABLE \| KVM_GUESTDBG_USE_HW_BP;
		debug.arch.debugreg[i] = CAST_TO_RIP(guest_value);
		debug.arch.debugreg[7] = 0x00000400 \| (1UL << (2*i+1)) \|
		(0x000d0000UL << (4*i));
		APPLY_DEBUG();
		vcpu_run(vm, VCPU_ID);
		target_dr6 = 0xffff0ff0 \| (1UL << i);
		TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
		run->debug.arch.exception == DB_VECTOR &&
		run->debug.arch.pc == CAST_TO_RIP(write_data) &&
		run->debug.arch.dr6 == target_dr6,
		"DATA_HW_BP (DR%d): exit %d exception %d rip 0x%llx "
		"(should be 0x%llx) dr6 0x%llx (should be 0x%llx)",
		i, run->exit_reason, run->debug.arch.exception,
		run->debug.arch.pc, CAST_TO_RIP(write_data),
		run->debug.arch.dr6, target_dr6);
		/* Rollback the 4-bytes "mov" */
		MOVE_RIP(-7);
		}
		/* Skip the 4-bytes "mov" */
		MOVE_RIP(7);

		/* Test single step */
		target_rip = CAST_TO_RIP(ss_start);
		target_dr6 = 0xffff4ff0ULL;
		vcpu_regs_get(vm, VCPU_ID, &regs);
		for (i = 0; i < (sizeof(ss_size) / sizeof(ss_size[0])); i++) {
		target_rip += ss_size[i];
		CLEAR_DEBUG();
		debug.control = KVM_GUESTDBG_ENABLE \| KVM_GUESTDBG_SINGLESTEP;
		debug.arch.debugreg[7] = 0x00000400;
		APPLY_DEBUG();
		vcpu_run(vm, VCPU_ID);
		TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
		run->debug.arch.exception == DB_VECTOR &&
		run->debug.arch.pc == target_rip &&
		run->debug.arch.dr6 == target_dr6,
		"SINGLE_STEP[%d]: exit %d exception %d rip 0x%llx "
		"(should be 0x%llx) dr6 0x%llx (should be 0x%llx)",
		i, run->exit_reason, run->debug.arch.exception,
		run->debug.arch.pc, target_rip, run->debug.arch.dr6,
		target_dr6);
		}

		/* Disable all debug controls, run to the end */
		CLEAR_DEBUG();
		APPLY_DEBUG();

		vcpu_run(vm, VCPU_ID);
		TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, "KVM_EXIT_IO");
		cmd = get_ucall(vm, VCPU_ID, &uc);
		TEST_ASSERT(cmd == UCALL_DONE, "UCALL_DONE");

		kvm_vm_free(vm);

		return 0;
		}

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