Commit 82b542e1 authored by Sean Christopherson's avatar Sean Christopherson
Browse files

KVM: selftests: Precisely limit the number of guest loops in mmu_stress_test 



Run the exact number of guest loops required in mmu_stress_test instead
of looping indefinitely in anticipation of adding more stages that run
different code (e.g. reads instead of writes).

Reviewed-by: default avatarJames Houghton <jthoughton@google.com>
Reviewed-by: default avatarAndrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20241128005547.4077116-12-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 3a042252

tools/testing/selftests/kvm/mmu_stress_test.c

+19 −6
Original line number Diff line number Diff line
@@ -20,12 +20,15 @@ 
static void guest_code(uint64_t start_gpa, uint64_t end_gpa, uint64_t stride)

{

	uint64_t gpa;

	int i;



	for (;;) {

	for (i = 0; i < 2; i++) {

		for (gpa = start_gpa; gpa < end_gpa; gpa += stride)

			vcpu_arch_put_guest(*((volatile uint64_t *)gpa), gpa);

		GUEST_SYNC(0);

		GUEST_SYNC(i);

	}



	GUEST_ASSERT(0);

}



struct vcpu_info {
@@ -52,10 +55,18 @@ static void rendezvous_with_boss(void) 
	}

}



static void run_vcpu(struct kvm_vcpu *vcpu)

static void assert_sync_stage(struct kvm_vcpu *vcpu, int stage)

{

	struct ucall uc;



	TEST_ASSERT_EQ(get_ucall(vcpu, &uc), UCALL_SYNC);

	TEST_ASSERT_EQ(uc.args[1], stage);

}



static void run_vcpu(struct kvm_vcpu *vcpu, int stage)

{

	vcpu_run(vcpu);

	TEST_ASSERT_EQ(get_ucall(vcpu, NULL), UCALL_SYNC);

	assert_sync_stage(vcpu, stage);

}



static void *vcpu_worker(void *data)
@@ -69,7 +80,8 @@ static void *vcpu_worker(void *data) 


	rendezvous_with_boss();



	run_vcpu(vcpu);

	/* Stage 0, write all of guest memory. */

	run_vcpu(vcpu, 0);

	rendezvous_with_boss();

#ifdef __x86_64__

	vcpu_sregs_get(vcpu, &sregs);
@@ -79,7 +91,8 @@ static void *vcpu_worker(void *data) 
#endif

	rendezvous_with_boss();



	run_vcpu(vcpu);

	/* Stage 1, re-write all of guest memory. */

	run_vcpu(vcpu, 1);

	rendezvous_with_boss();



	return NULL;