[PATCH v5] arm64: smccc: Support SMCCC v1.3 SVE register saving hint

[Will Deacon]

On Tue, 1 Jun 2021 14:04:19 +0100, Mark Brown wrote:
> SMCCC v1.2 requires that all SVE state be preserved over SMC calls which
> introduces substantial overhead in the common case where there is no SVE
> state in the registers. To avoid this SMCCC v1.3 introduces a flag which
> allows the caller to say that there is no state that needs to be preserved
> in the registers. Make use of this flag, setting it if the SMCCC version
> indicates support for it and the TIF_ flags indicate that there is no live
> SVE state in the registers, this avoids placing any constraints on when
> SMCCC calls can be done or triggering extra saving and reloading of SVE
> register state in the kernel.
> 
> [...]

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

[1/1] arm64: smccc: Support SMCCC v1.3 SVE register saving hint
      https://git.kernel.org/arm64/c/0a284a999fed

Cheers,
-- 
Will

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