On Mon, Dec 10, 2018 at 04:37:30PM -0200, Eduardo Habkost wrote: > It isn't as simply as reverting commit 33b5e8c03ae7, but we can > surely re-add RDTSCP on pc-*-4.0 and newer. Sure. If you could only point me to an example how to add that to pc-*-4.0 and newer, I'll gladly cook up a patch and test it. > I thought we added documentation mentioning the minimum kernel > version required by QEMU, but I can't find it. In either case, > it seems reasonable to require Linux 4.5 or newer on newer > machine-types. When you say "require" does that mean, one puts it in a text file somewhere in the qemu sources or do we enforce it somehow? Thx. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.