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KVM: selftests: test KVM_GUESTDBG_BLOCKIRQ

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Modify debug_regs test to create a pending interrupt
and see that it is blocked when single stepping is done
with KVM_GUESTDBG_BLOCKIRQ

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210811122927.900604-7-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Maxim Levitsky 2021-08-11 15:29:27 +03:00 • committed by Paolo Bonzini
parent 61e5f69ef0
commit 85cc207b8e
1 changed files with 21 additions and 3 deletions
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24
tools/testing/selftests/kvm/x86_64/debug_regs.c
View file

@ -8,12 +8,15 @@
#include <string.h>
#include "kvm_util.h"
#include "processor.h"
#include "apic.h"
#define VCPU_ID 0
#define DR6_BD (1 << 13)
#define DR7_GD (1 << 13)
#define IRQ_VECTOR 0xAA
/* For testing data access debug BP */
uint32_t guest_value;
@ -21,6 +24,11 @@ extern unsigned char sw_bp, hw_bp, write_data, ss_start, bd_start;
static void guest_code(void)
{
/* Create a pending interrupt on current vCPU */
x2apic_enable();
x2apic_write_reg(APIC_ICR, APIC_DEST_SELF | APIC_INT_ASSERT |
APIC_DM_FIXED | IRQ_VECTOR);
/*
* Software BP tests.
*
@ -38,12 +46,19 @@ static void guest_code(void)
"mov %%rax,%0;\n\t write_data:"
: "=m" (guest_value) : : "rax");
/* Single step test, covers 2 basic instructions and 2 emulated */
/*
* Single step test, covers 2 basic instructions and 2 emulated
*
* Enable interrupts during the single stepping to see that
* pending interrupt we raised is not handled due to KVM_GUESTDBG_BLOCKIRQ
*/
asm volatile("ss_start: "
"sti\n\t"
"xor %%eax,%%eax\n\t"
"cpuid\n\t"
"movl $0x1a0,%%ecx\n\t"
"rdmsr\n\t"
"cli\n\t"
: : : "eax", "ebx", "ecx", "edx");
/* DR6.BD test */
@ -72,11 +87,13 @@ int main(void)
uint64_t cmd;
int i;
/* Instruction lengths starting at ss_start */
int ss_size[4] = {
int ss_size[6] = {
1, /* sti*/
2, /* xor */
2, /* cpuid */
5, /* mov */
2, /* rdmsr */
1, /* cli */
};
if (!kvm_check_cap(KVM_CAP_SET_GUEST_DEBUG)) {
@ -154,7 +171,8 @@ int main(void)
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.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP |
KVM_GUESTDBG_BLOCKIRQ;
debug.arch.debugreg[7] = 0x00000400;
APPLY_DEBUG();
vcpu_run(vm, VCPU_ID);