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

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Message-ID: <160383490303.884498.18303417191821273905@swboyd.mtv.corp.google.com>
Date:   Tue, 27 Oct 2020 14:41:43 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Will Deacon <will@...nel.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Andre Przywara <andre.przywara@....com>,
        Steven Price <steven.price@....com>,
        Marc Zyngier <maz@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH v3] KVM: arm64: ARM_SMCCC_ARCH_WORKAROUND_1 doesn't return SMCCC_RET_NOT_REQUIRED

Quoting Will Deacon (2020-10-26 06:25:33)
> On Fri, Oct 23, 2020 at 08:47:50AM -0700, Stephen Boyd wrote:
> > diff --git a/include/linux/arm-smccc.h b/include/linux/arm-smccc.h
> > index 15c706fb0a37..0e50ba3e88d7 100644
> > --- a/include/linux/arm-smccc.h
> > +++ b/include/linux/arm-smccc.h
> > @@ -86,6 +86,8 @@
> >                          ARM_SMCCC_SMC_32,                            \
> >                          0, 0x7fff)
> >  
> > +#define SMCCC_ARCH_WORKAROUND_RET_UNAFFECTED 1
> 
> I thought we'd stick this in asm/spectre.h, but here is also good:
> 
> Acked-by: Will Deacon <will@...nel.org>
> 

Ah sorry I glossed over that one. I suppose it can be moved during patch
application if desired.