Re: [PATCH 0/2] arm64: fix+cleanup for ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD

From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
	Mark Rutland <mark.rutland@arm.com>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
	Will Deacon <will@kernel.org>,
	stable@vger.kernel.org, robh@kernel.org, james.morse@arm.com
Subject: Re: [PATCH 0/2] arm64: fix+cleanup for ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
Date: Thu, 18 Jan 2024 12:02:26 +0000	[thread overview]
Message-ID: <170557561037.3200718.6656632532505785315.b4-ty@kernel.org> (raw)
In-Reply-To: <20240116110221.420467-1-mark.rutland@arm.com>

On Tue, 16 Jan 2024 11:02:19 +0000, Mark Rutland wrote:
> While testing an unrelated patch on the arm64 for-next/core branch, I
> spotted an issue in the ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
> workaround. The first patch fixes that issue, and the second patch
> cleans up the remaining logic.
> 
> The issue has existed since the workaround was introduced in commit:
> 
> [...]

Cheers, I picked these up, but you might need to shepherd them
through -stable, so please keep an eye out for any "failed to apply"
mails.

Talking of which, the original workaround didn't make it to any kernels
before 6.1:

[5.15] https://lore.kernel.org/r/2023100743-evasion-figment-fbcc@gregkh
[5.10] https://lore.kernel.org/r/2023100745-statute-component-dd0f@gregkh

Please can you or Rob have a crack at that?

[1/2] arm64: entry: fix ARM64_WORKAROUND_SPECULATIVE_UNPRIV_LOAD
      https://git.kernel.org/arm64/c/832dd634bd1b
[2/2] arm64: entry: simplify kernel_exit logic
      https://git.kernel.org/arm64/c/da59f1d051d5

Cheers,
-- 
Will

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