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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.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20241128013424.4096668-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-11-27 17:33:36 -08:00
parent a2a791e820
commit 01bcd829c6
1 changed files with 10 additions and 0 deletions
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tools/testing/selftests/kvm/x86/set_sregs_test.c
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@@ -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);