On Mon, 19 Feb 2018 16:43:50 -0800 Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > On Mon, Feb 19, 2018 at 4:13 PM, Alan Cox <gnomes@xxxxxxxxxxxxxxxxxxx> wrote: > > > > In theory there's nothing stopping a guest getting a 'you are about to > > gain/lose IBRS' message or having a new 'CPU' hotplugged and the old one > > removed. > > I'm not convinced we handle the case of hotplug CPU's with different > CPU models correctly. We don't. And even if we did the user space doesn't. It would be a painful task to resolve. Alan
