On Sat, Jan 13, 2018 at 08:22:31AM +0100, Vincent Bernat wrote: > ❦ 12 janvier 2018 16:47 -0200, Eduardo Habkost <ehabk...@redhat.com> : > > > Adding Westmere-PCID would require adding a Westmere-PCID-IBRS > > CPU model too, so this is starting to look a bit ridiculous. > > Sane VM management systems would know how to use > > "-cpu Westmere,+pcid" without requiring new CPU model entries in > > QEMU. What's missing in existing management stacks to allow that > > to happen? > > That's what I actually do. So, I am fine with the solution of doing > nothing. However, it would be nice for unaware people to get the speedup > of pcid without knowing about it. Maybe we can just forget about > Westmere and still apply it to Sandy Bridge and Ivy Bridge.
If management stacks today don't let the user choose "Westmere,+pcid", we probably have no other choice than adding a Westmere-PCID CPU model. But our management stacks need to be fixed so we won't need similar hacks in the future. -- Eduardo
