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    SubjectRe: [PATCH 2/2] x86/speculation: Support "Enhanced IBRS" on future CPUs
    On Mon, 19 Feb 2018 16:43:50 -0800
    Linus Torvalds <torvalds@linux-foundation.org> wrote:

    > On Mon, Feb 19, 2018 at 4:13 PM, Alan Cox <gnomes@lxorguk.ukuu.org.uk> 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

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