linux-kernel - Re: [Patch] memory: tegra: Skip SID override from Guest VM

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Message-ID: <86ttml69d3.wl-maz@kernel.org>
Date: Tue, 06 Feb 2024 12:54:48 +0000
From: Marc Zyngier <maz@...nel.org>
To: Jon Hunter <jonathanh@...dia.com>
Cc: Sumit Gupta <sumitg@...dia.com>,
	treding@...dia.com,
	krzysztof.kozlowski@...aro.org,
	mark.rutland@....com,
	linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org,
	amhetre@...dia.com,
	bbasu@...dia.com
Subject: Re: [Patch] memory: tegra: Skip SID override from Guest VM

On Tue, 06 Feb 2024 12:51:35 +0000,
Jon Hunter <jonathanh@...dia.com> wrote:
> 
> 
> On 06/02/2024 12:28, Jon Hunter wrote:
> 
> ...
> 
> >> - My own tegra186 HW doesn't have VHE, since it is ARMv8.0, and this
> >>    helper will always return 'false'. How could this result in
> >>    something that still works? Can I get a free CPU upgrade?
> > 
> > I thought this API just checks to see if we are in EL2?
> 
> 
> Sorry to add a bit more info, I see EL2 is used for hypervisor [0],
> but on my Tegra186 with no hypervisor I see ...
> 
>  CPU: All CPU(s) started at EL2

Yes. and yet the kernel runs at EL1 (on ARMv8.0, we can't run the
kernel at EL2 at all).

	M.

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