guest_cpuid_has
if (guest_cpuid_has(vcpu, X86_FEATURE_XSAVES) ||
!guest_cpuid_has(vcpu, X86_FEATURE_XSAVES));
if (!guest_cpuid_has(vcpu, X86_FEATURE_XSAVES))
!guest_cpuid_has(vcpu, X86_FEATURE_XSAVES))