From: Will Deacon <will@kernel.org>
To: Marc Zyngier <maz@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>
Cc: kernel-team@android.com,
Daniel Lezcano <daniel.lezcano@linaro.org>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 0/4] arm64: Allow the compat vdso to be disabled at runtime
Date: Wed, 8 Jul 2020 23:02:36 +0100 [thread overview]
Message-ID: <159424187316.2038208.16959988193299607645.b4-ty@kernel.org> (raw)
In-Reply-To: <20200706163802.1836732-1-maz@kernel.org>
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
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prev parent reply other threads:[~2020-07-08 22:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-06 16:37 [PATCH v2 0/4] arm64: Allow the compat vdso to be disabled at runtime Marc Zyngier
2020-07-06 16:37 ` [PATCH v2 1/4] arm64: Introduce a way to disable the 32bit vdso Marc Zyngier
2020-07-06 16:38 ` [PATCH v2 2/4] arm64: arch_timer: Allow an workaround descriptor to disable compat vdso Marc Zyngier
2020-07-06 16:55 ` Mark Rutland
2020-07-06 16:38 ` [PATCH v2 3/4] arm64: arch_timer: Disable the compat vdso for cores affected by ARM64_WORKAROUND_1418040 Marc Zyngier
2020-07-06 16:57 ` Mark Rutland
2020-07-06 16:38 ` [PATCH v2 4/4] arm64: Rework ARM_ERRATUM_1414080 handling Marc Zyngier
2020-07-06 17:12 ` Mark Rutland
2020-07-08 22:02 ` Will Deacon [this message]
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