KVM: selftests: Mask off OSPKE and OSXSAVE when comparing CPUID entries

Mask off OSPKE and OSXSAVE, which are toggled based on corresponding CR4
enabling bits, when comparing vCPU CPUID against KVM's supported CPUID.
This will allow setting OSXSAVE by default when creating vCPUs, without
causing test failures (KVM doesn't enumerate OSXSAVE=1).

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20241003234337.273364-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

tools/testing/selftests/kvm/x86_64/cpuid_test.c

@@ -62,6 +62,12 @@ static struct cpuid_mask get_const_cpuid_mask(const struct kvm_cpuid_entry2 *ent
 	memset(&mask, 0xff, sizeof(mask));
 
 	switch (entry->function) {
+	case 0x1:
+		mask.regs[X86_FEATURE_OSXSAVE.reg] &= ~BIT(X86_FEATURE_OSXSAVE.bit);
+		break;
+	case 0x7:
+		mask.regs[X86_FEATURE_OSPKE.reg] &= ~BIT(X86_FEATURE_OSPKE.bit);
+		break;
 	case 0xd:
 		/*
 		 * CPUID.0xD.{0,1}.EBX enumerate XSAVE size based on the current