From: "Woodhouse, David" <dwmw@amazon.co.uk>
To: Alexey Dobriyan <adobriyan@gmail.com>, <pbonzini@redhat.com>,
<rkrcmar@redhat.com>, <tglx@linutronix.de>, <mingo@redhat.com>,
<hpa@zytor.com>, <dave.hansen@linux.intel.com>
Cc: <linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
<x86@kernel.org>, <arjan@linux.intel.com>
Subject: Re: tip/master falls off NOP cliff with KPTI under KVM
Date: Wed, 10 Jan 2018 22:53:43 +0000 [thread overview]
Message-ID: <1515624823.22302.260.camel@amazon.co.uk> (raw)
In-Reply-To: <20180110223457.GA1762@avx2>
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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'...
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next prev parent reply other threads:[~2018-01-10 22:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-10 22:08 tip/master falls off NOP cliff with KPTI under KVM Alexey Dobriyan
2018-01-10 22:34 ` Alexey Dobriyan
2018-01-10 22:53 ` Woodhouse, David [this message]
2018-01-25 0:53 ` Dexuan-Linux Cui
2018-01-25 7:53 ` David Woodhouse
2018-01-25 19:00 ` Dexuan Cui
2018-01-25 19:13 ` Thomas Gleixner
2018-01-25 19:35 ` Dexuan-Linux Cui
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