Messages in this thread | | | From | Linus Torvalds <> | Date | Sun, 21 Jan 2018 14:27:58 -0800 | Subject | Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation |
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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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