Commit 85cc207b authored by Maxim Levitsky's avatar Maxim Levitsky Committed by Paolo Bonzini
Browse files

KVM: selftests: test KVM_GUESTDBG_BLOCKIRQ 



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: default avatarMaxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210811122927.900604-7-mlevitsk@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 61e5f69e

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

+21 −3
Original line number Diff line number Diff line
@@ -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);