[libvirt] xsave-related CPU features implementation

Hello, I would like to add support for the next CPU features which presents in QEMU - xsaveopt, xsavec, xgetbv1, xsaves. These features were introduced in QEMU commit 0bb0b2d2fe7f645ddaf1f0ff40ac669c9feb4aa1. I was confused by comment in src/cpu/cpu_map.xml: ... <!-- We support only ecx 0x0 now as it's done by a workaround --> ... Is this comment is still actual? This feature set needs ecx 0x1. I can see that it was a temporary solution in commit by Peter Krempa 012f9b19ef3812884e207dc431571502de4cebce. Does these features addtion require CPU detection improvement? Or can I simply put them into src/cpu/cpu_map.xml? Thank you -- Regards, Alexander Burluka