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KVM: selftests: Add KVM_SET_GUEST_DEBUG test 

Covers fundamental tests for KVM_SET_GUEST_DEBUG. It is very close to the debug
test in kvm-unit-test, but doing it from outside the guest.

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20200505205000.188252-4-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2020-05-05 16:50:00 -04:00 committed by Paolo Bonzini
parent d5d260c5ff
commit 449aa906e6
4 changed files with 192 additions and 0 deletions
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1
tools/testing/selftests/kvm/Makefile
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@ -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_set_nested_state_test
TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_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/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 += clear_dirty_log_test
TEST_GEN_PROGS_x86_64 += demand_paging_test TEST_GEN_PROGS_x86_64 += demand_paging_test
TEST_GEN_PROGS_x86_64 += dirty_log_test TEST_GEN_PROGS_x86_64 += dirty_log_test

2
tools/testing/selftests/kvm/include/kvm_util.h
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@ -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); void vcpu_run(struct kvm_vm *vm, uint32_t vcpuid);
int _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_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, void vcpu_set_mp_state(struct kvm_vm *vm, uint32_t vcpuid,
struct kvm_mp_state *mp_state); struct kvm_mp_state *mp_state);
void vcpu_regs_get(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs); void vcpu_regs_get(struct kvm_vm *vm, uint32_t vcpuid, struct kvm_regs *regs);

9
tools/testing/selftests/kvm/lib/kvm_util.c
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@ -1201,6 +1201,15 @@ void vcpu_run_complete_io(struct kvm_vm *vm, uint32_t vcpuid)
ret, errno); 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 * VM VCPU Set MP State
* *

180
tools/testing/selftests/kvm/x86_64/debug_regs.c Normal file
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@ -0,0 +1,180 @@
// 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;
}