Re: [PATCH] arm64/ptrace: Ensure that SME is set up for target when writing SSVE state

On Thu, 10 Aug 2023 12:28:19 +0100, Mark Brown wrote:

When we use NT_ARM_SSVE to either enable streaming mode or change the vector length for a process we do not currently do anything to ensure that there is storage allocated for the SME specific register state. If the task had not previously used SME or we changed the vector length then the task will not have had TIF_SME set or backing storage for ZA/ZT allocated, resulting in inconsistent register sizes when saving state and spurious traps which flush the newly set register state.

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

[1/1] arm64/ptrace: Ensure that SME is set up for target when writing SSVE state https://git.kernel.org/arm64/c/5d0a8d2fba50