XSAVE
asm volatile("1: " ALTERNATIVE_3(XSAVE, \
XSTATE_OP(XSAVE, buf, lmask, hmask, err);
F(XSAVE),
__nested_svm_sanitize_intercept(vcpu, to, XSAVE, XSETBV);
cr4_fixed1_update(X86_CR4_OSXSAVE, ecx, feature_bit(XSAVE));