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Subject[PATCH v2 07/49] KVM: selftests: Verify KVM stuffs runtime CPUID OS bits on CR4 writes
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Extend x86's set sregs test to verify that KVM sets/clears OSXSAVE and
OSKPKE according to CR4.XSAVE and CR4.PKE respectively. For performance
reasons, KVM is responsible for emulating the architectural behavior of
the OS CPUID bits tracking CR4.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
tools/testing/selftests/kvm/x86_64/set_sregs_test.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/tools/testing/selftests/kvm/x86_64/set_sregs_test.c b/tools/testing/selftests/kvm/x86_64/set_sregs_test.c
index 96fd690d479a..f4095a3d1278 100644
--- a/tools/testing/selftests/kvm/x86_64/set_sregs_test.c
+++ b/tools/testing/selftests/kvm/x86_64/set_sregs_test.c
@@ -85,6 +85,16 @@ static void test_cr_bits(struct kvm_vcpu *vcpu, uint64_t cr4)
rc = _vcpu_sregs_set(vcpu, &sregs);
TEST_ASSERT(!rc, "Failed to set supported CR4 bits (0x%lx)", cr4);

+ TEST_ASSERT(!!(sregs.cr4 & X86_CR4_OSXSAVE) ==
+ (vcpu->cpuid && vcpu_cpuid_has(vcpu, X86_FEATURE_OSXSAVE)),
+ "KVM didn't %s OSXSAVE in CPUID as expected",
+ (sregs.cr4 & X86_CR4_OSXSAVE) ? "set" : "clear");
+
+ TEST_ASSERT(!!(sregs.cr4 & X86_CR4_PKE) ==
+ (vcpu->cpuid && vcpu_cpuid_has(vcpu, X86_FEATURE_OSPKE)),
+ "KVM didn't %s OSPKE in CPUID as expected",
+ (sregs.cr4 & X86_CR4_PKE) ? "set" : "clear");
+
vcpu_sregs_get(vcpu, &sregs);
TEST_ASSERT(sregs.cr4 == cr4, "sregs.CR4 (0x%llx) != CR4 (0x%lx)",
sregs.cr4, cr4);
--
2.45.0.215.g3402c0e53f-goog

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