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
