linux-kernel - Re: [PATCH v2 0/4] arm64: Allow the compat vdso to be disabled at runtime

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Date:   Wed,  8 Jul 2020 23:02:36 +0100
From:   Will Deacon <will@...nel.org>
To:     Marc Zyngier <maz@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v2 0/4] arm64: Allow the compat vdso to be disabled at runtime

On Mon, 6 Jul 2020 17:37:58 +0100, Marc Zyngier wrote:
> The relatively recent introduction of the compat vdso on arm64 has
> overlooked its interactions with some of the interesting errata
> workarounds, such as ARM64_ERRATUM_1418040 (and its older 1188873
> incarnation).
> 
> This erratum requires the 64bit kernel to trap 32bit accesses to the
> virtual counter and emulate it. When the workaround was introduced,
> the compat vdso simply wasn't a thing. Now that the patches have
> landed in mainline, we trap the CVTVCT accesses from the vdso.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/4] arm64: Introduce a way to disable the 32bit vdso
      https://git.kernel.org/arm64/c/97884ca8c292
[2/4] arm64: arch_timer: Allow an workaround descriptor to disable compat vdso
      https://git.kernel.org/arm64/c/c1fbec4ac0d7
[3/4] arm64: arch_timer: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040
      https://git.kernel.org/arm64/c/4b661d6133c5
[4/4] arm64: Rework ARM_ERRATUM_1414080 handling
      https://git.kernel.org/arm64/c/dc802f2bc020

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev