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KVM: selftests: Verify XCR0 can be "downgraded" and "upgraded"

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Now that KVM selftests enable all supported XCR0 features by default, add
a testcase to the XCR0 vs. CPUID test to verify that the guest can disable
everything except the legacy FPU in XCR0, and then re-enable the full
feature set, which is kinda sorta what the test did before XCR0 was setup
by default.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20241003234337.273364-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-10-03 16:43:32 -07:00
parent 8b14c4d85d
commit 8ae01bf64c
1 changed files with 5 additions and 0 deletions
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5
tools/testing/selftests/kvm/x86_64/xcr0_cpuid_test.c
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@@ -79,6 +79,11 @@ static void guest_code(void)
ASSERT_ALL_OR_NONE_XFEATURE(supported_xcr0,
XFEATURE_MASK_XTILE);
vector = xsetbv_safe(0, XFEATURE_MASK_FP);
__GUEST_ASSERT(!vector,
"Expected success on XSETBV(FP), got vector '0x%x'",
vector);
vector = xsetbv_safe(0, supported_xcr0);
__GUEST_ASSERT(!vector,
"Expected success on XSETBV(0x%lx), got vector '0x%x'",