xsetbv can be expensive when running on nested virtualization, try to
avoid it.
Reviewed-by: NJim Mattson <jmattson@google.com>
Reviewed-by: NWanpeng Li <wanpeng.li@hotmail.com>
Reviewed-by: NQuan Xu <quan.xu0@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NRadim Krčmář <rkrcmar@redhat.com>