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SubjectRe: tip/master falls off NOP cliff with KPTI under KVM
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On Thu, 2018-01-11 at 01:34 +0300, Alexey Dobriyan wrote:
>
> Bisection points to
>
>         f3433c1010c6af61c9897f0f0447f81b991feac1 is the first bad commit
>         commit f3433c1010c6af61c9897f0f0447f81b991feac1
>         Author: David Woodhouse <dwmw@amazon.co.uk>
>         Date:   Tue Jan 9 14:43:11 2018 +0000
>
>             x86/retpoline/entry: Convert entry assembler indirect jumps

Thanks. We've fixed the underlying problem with the alternatives
mechanism, *and* changed the retpoline code not to actually rely on
said fix.

> RETPOLINE is enabled but build system is reporting that compiler doesn't
> support it (Gentoo 6.4.0 p1.1)
>
> Disabling CONFIG_RETPOLINE fixes boot.
>
> And build system reports that "system may be insecure" even if RETPOLINE
> is disabled.

That's odd. The warning is *inside* 'ifdef CONFIG_RETPOLINE'...[unhandled content-type:application/x-pkcs7-signature]
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