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

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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: James Houghton <jthoughton@google.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20241128005547.4077116-12-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-11-27 16:55:42 -08:00
parent 3a04225264
commit 82b542e118
1 changed files with 19 additions and 6 deletions
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25
tools/testing/selftests/kvm/mmu_stress_test.c
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@ -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;