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KVM: selftests: Extend cpuid_test to verify KVM_GET_CPUID2 "nent" updates

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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).

Link: https://lore.kernel.org/r/20230526210340.2799158-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-05-26 14:03:40 -07:00
parent ab322c43cc
commit 2c76131319
1 changed files with 21 additions and 0 deletions
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21
tools/testing/selftests/kvm/x86_64/cpuid_test.c
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@ -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);
}