Subject: Re: [PATCH V2 3/7] arm64: errata: Add detection for TRBE invalid prohibited states

From: Catalin Marinas <[email-masked]>
Date: Fri, 7 Jan 2022 10:59:09 +0000

On Fri, Jan 07, 2022 at 06:40:04AM +0530, Anshuman Khandual wrote:
> TRBE implementations affected by Arm erratum #2038923 might get TRBE into
> an inconsistent view on whether trace is prohibited within the CPU. As a
> result, the trace buffer or trace buffer state might be corrupted. This
> happens after TRBE buffer has been enabled by setting TRBLIMITR_EL1.E,
> followed by just a single context synchronization event before execution
> changes from a context, in which trace is prohibited to one where it isn't,
> or vice versa. In these mentioned conditions, the view of whether trace is
> prohibited is inconsistent between parts of the CPU, and the trace buffer
> or the trace buffer state might be corrupted. This adds a new errata
> ARM64_ERRATUM_2038923 in arm64 errata framework.
> 
> Cc: Catalin Marinas <[email-masked]>
> Cc: Will Deacon <[email-masked]>
> Cc: Mathieu Poirier <[email-masked]>
> Cc: Suzuki Poulose <[email-masked]>
> Cc: [email-masked]
> Cc: [email-masked]
> Cc: [email-masked]
> Cc: [email-masked]
> Signed-off-by: Anshuman Khandual <[email-masked]>

Acked-by: Catalin Marinas <[email-masked]>

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