On Mon, Dec 10, 2018 at 07:41:53PM +0100, Borislav Petkov wrote: > 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. Sorry, I forgot to reply to this part. See commit 33b5e8c03ae7 for reference. The differences will be: * Instead of removing RDTSCP from builtin_x86_defs, you'll be adding it. * Instead of adding rdtscp=on entries to PC_COMPAT_2_4, you'll be adding rdtscp=off entries to PC_COMPAT_3_1. PC_COMPAT_3_1 is added by the patch that creates the 4.0 machine-types. You can find it on my machine-next branch at: http://github.com/ehabkost/qemu -- Eduardo
