linux-kernel - Re: [PATCH v3] KVM: arm64: ARM_SMCCC_ARCH_WORKAROUND_1 doesn't return SMCCC_RET_NOT

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Date:   Wed, 28 Oct 2020 15:12:36 +0000
From:   Will Deacon <will@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Stephen Boyd <swboyd@...omium.org>
Cc:     kernel-team@...roid.com, Will Deacon <will@...nel.org>,
        Andre Przywara <andre.przywara@....com>,
        linux-kernel@...r.kernel.org, Marc Zyngier <maz@...nel.org>,
        stable@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Steven Price <steven.price@....com>
Subject: Re: [PATCH v3] KVM: arm64: ARM_SMCCC_ARCH_WORKAROUND_1 doesn't return SMCCC_RET_NOT_REQUIRED

On Fri, 23 Oct 2020 08:47:50 -0700, Stephen Boyd wrote:
> According to the SMCCC spec[1](7.5.2 Discovery) the
> ARM_SMCCC_ARCH_WORKAROUND_1 function id only returns 0, 1, and
> SMCCC_RET_NOT_SUPPORTED.
> 
>  0 is "workaround required and safe to call this function"
>  1 is "workaround not required but safe to call this function"
>  SMCCC_RET_NOT_SUPPORTED is "might be vulnerable or might not be, who knows, I give up!"
> 
> [...]

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

[1/1] KVM: arm64: ARM_SMCCC_ARCH_WORKAROUND_1 doesn't return SMCCC_RET_NOT_REQUIRED
      https://git.kernel.org/arm64/c/1de111b51b82

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev