From: Will Deacon <will@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Mark Brown <broonie@kernel.org>
Cc: kernel-team@android.com, Will Deacon <will@kernel.org>,
Marc Zyngier <maz@kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
linux-arm-kernel@lists.infradead.org,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Ard Biesheuvel <ardb@kernel.org>
Subject: Re: [PATCH v5] arm64: smccc: Support SMCCC v1.3 SVE register saving hint
Date: Tue, 1 Jun 2021 19:20:58 +0100 [thread overview]
Message-ID: <162255596295.3128943.7640114426381897762.b4-ty@kernel.org> (raw)
In-Reply-To: <20210601130419.5432-1-broonie@kernel.org>
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
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
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next prev parent reply other threads:[~2021-06-01 18:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-01 13:04 [PATCH v5] arm64: smccc: Support SMCCC v1.3 SVE register saving hint Mark Brown
2021-06-01 13:58 ` Marc Zyngier
2021-06-01 18:20 ` Will Deacon [this message]
2021-06-01 18:32 ` Will Deacon
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