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

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Message-ID: <c7e71e7e-ef01-4539-b481-9f4a95e6a444@nvidia.com>
Date: Tue, 6 Feb 2024 12:51:35 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Marc Zyngier <maz@...nel.org>, Sumit Gupta <sumitg@...dia.com>
Cc: 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 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

Jon

[0] 
https://developer.arm.com/documentation/102412/0103/Privilege-and-Exception-levels/Exception-levels

-- 
nvpublic