Verify that KVM reports the actual number of CPUID entries on success, but
doesn't touch the userspace struct on failure (which for better or worse,
is KVM's ABI).
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
.../testing/selftests/kvm/x86_64/cpuid_test.c | 21 +++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/tools/testing/selftests/kvm/x86_64/cpuid_test.c b/tools/testing/selftests/kvm/x86_64/cpuid_test.c
index 2fc3ad9c887e..d3c3aa93f090 100644
--- a/tools/testing/selftests/kvm/x86_64/cpuid_test.c
+++ b/tools/testing/selftests/kvm/x86_64/cpuid_test.c
@@ -163,6 +163,25 @@ static void set_cpuid_after_run(struct kvm_vcpu *vcpu)
ent->eax = eax;
}
+static void test_get_cpuid2(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(vcpu->cpuid->nent + 1);
+ int i, r;
+
+ vcpu_ioctl(vcpu, KVM_GET_CPUID2, cpuid);
+ TEST_ASSERT(cpuid->nent == vcpu->cpuid->nent,
+ "KVM didn't update nent on success, wanted %u, got %u\n",
+ vcpu->cpuid->nent, cpuid->nent);
+
+ for (i = 0; i < vcpu->cpuid->nent; i++) {
+ cpuid->nent = i;
+ r = __vcpu_ioctl(vcpu, KVM_GET_CPUID2, cpuid);
+ TEST_ASSERT(r && errno == E2BIG, KVM_IOCTL_ERROR(KVM_GET_CPUID2, r));
+ TEST_ASSERT(cpuid->nent == i, "KVM modified nent on failure");
+ }
+ free(cpuid);
+}
+
int main(void)
{
struct kvm_vcpu *vcpu;
@@ -183,5 +202,7 @@ int main(void)
set_cpuid_after_run(vcpu);
+ test_get_cpuid2(vcpu);
+
kvm_vm_free(vm);
}
--
2.41.0.rc0.172.g3f132b7071-goog
