linux-kernel - Re: [GIT PULL] arm64 spectre and meltdown mitigations for v4.14-stable

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Date:   Wed, 14 Feb 2018 19:22:46 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     stable@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Brown <broonie@...aro.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [GIT PULL] arm64 spectre and meltdown mitigations for
 v4.14-stable

On Wed, Feb 14, 2018 at 03:49:36PM +0000, Ard Biesheuvel wrote:
> On 14 February 2018 at 15:40, Greg KH <gregkh@...uxfoundation.org> wrote:
> > On Wed, Feb 14, 2018 at 02:34:01PM +0000, Ard Biesheuvel wrote:
> >> On 14 February 2018 at 14:24, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> >> > On 14 February 2018 at 13:54, Greg KH <gregkh@...uxfoundation.org> wrote:
> >> >> On Mon, Feb 12, 2018 at 11:38:01AM +0000, Ard Biesheuvel wrote:
> >> >>> Hi Greg,
> >> >>>
> >> >>> As mentioned by Will, I have created the v4.14 counterpart of his stable
> >> >>> backport of the arm64/ARM Spectre/Meltdown mitigations that have been pulled
> >> >>> into v4.16-rc1.
> >> >>>
> >> >>> Given that this is the v4.15 version backported to v4.14, I have removed any
> >> >>> mention of 'conflicts' from the commit logs as they are now ambiguous. The
> >> >>> patches applied surprisingly cleanly, I only needed to drop two patches that
> >> >>> are already in (the same ones Will mentioned in his PR), and drop another one
> >> >>> dealing with SPE, support for which did not exist yet in v4.14. I also included
> >> >>> the patch
> >> >>>
> >> >>>   arm64: move TASK_* definitions to <asm/processor.h>
> >> >>>
> >> >>> from v4.15 to make Robin's Spectre v1 patches apply more cleanly.
> >> >>
> >> >> I've queued these up now, but if you could pull the whole quilt tree and
> >> >> verify I got things right, that would be great.  There was some
> >> >> conflicts with a few previous patches I had already queued up that
> >> >> touched some "Falkor" errata code.
> >> >>
> >> >> Specifically 932b50c7c1c65e6f23002e075b97ee083c4a9e71 "arm64: Add
> >> >> software workaround for Falkor erratum 1041" is the offending patch.  I
> >> >> think I resolved the merge issues properly, but verifying this would be
> >> >> wonderful.
> >> >>
> >> >
> >> > No, the build is broken now. I will investigate.
> >>
> >> Your patch 977c3d2cb684e143a18e1564fbf5ecf7576a1c98
> >>
> >> arm64: Move post_ttbr_update_workaround to C code
> >>
> >> removes the pre_disable_mmu_workaround macro from asm/assembler.h but
> >> it should only remove post_ttbr_update_workaround
> >>
> >> Once I add that back, things seem to build and run as expected.
> >
> > Can you provide a "fixed" version of just this patch so I know to get it
> > correct?
> >
> 
> Sure. I will send it in a separate email, or Gmail will clobber the patch.

Thanks for that, I've now replaced it.

greg k-h