linux-kernel - Re: Relax CPU features sanity checking on heterogeneous architectures

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Message-ID: <86h846ypky.wl-maz@kernel.org>
Date:   Fri, 18 Oct 2019 17:40:29 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Mark Rutland <mark.rutland@....com>, rnayak@...eaurora.org,
        suzuki.poulose@....com, catalin.marinas@....com,
        linux-arm-kernel <linux-arm-kernel-bounces@...ts.infradead.org>,
        linux-kernel@...r.kernel.org, jeremy.linton@....com,
        bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        andrew.murray@....com, will@...nel.org, dave.martin@....com,
        linux-arm-kernel@...ts.infradead.org, marc.w.gonzalez@...e.fr
Subject: Re: Relax CPU features sanity checking on heterogeneous architectures

On Fri, 18 Oct 2019 15:33:29 +0100,
Stephen Boyd <swboyd@...omium.org> wrote:
> 
> Quoting Marc Zyngier (2019-10-18 00:20:56)
> > 
> > If this SoC is anythinig like SM8150, 32bit guests will be hit and 
> > miss,
> > depending on the CPU your guest runs on, or is migrated to. We need to
> > either drop capabilities from the 32bit-capable CPU, or prevent the
> > non-32bit capable CPU from booting if a 32bit guest has been started.
> > 
> > You just have to hope that the kernel is entered at EL2, and that QC's
> > "value add" has been moved somewhere else...
> > 
> 
> Ok that's good.

I need a new signature.

	M.

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