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    SubjectRe: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation
    On Sun, Jan 21, 2018 at 2:00 PM, David Woodhouse <dwmw2@infradead.org> wrote:
    >>
    >> The patches do things like add the garbage MSR writes to the kernel
    >> entry/exit points. That's insane. That says "we're trying to protect
    >> the kernel". We already have retpoline there, with less overhead.
    >
    > You're looking at IBRS usage, not IBPB. They are different things.

    Ehh. Odd intel naming detail.

    If you look at this series, it very much does that kernel entry/exit
    stuff. It was patch 10/10, iirc. In fact, the patch I was replying to
    was explicitly setting that garbage up.

    And I really don't want to see these garbage patches just mindlessly
    sent around.

    Linus

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