linux-kernel - Re: [PATCH 0/8] Relax sanity checking for mismatched AArch32 EL1

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Message-ID: <a86108a91975cacf94adc2a2101fba1b@codeaurora.org>
Date:   Thu, 16 Apr 2020 14:09:30 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Will Deacon <will@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        Mark Rutland <mark.rutland@....com>, kernel-team@...roid.com,
        Anshuman Khandual <anshuman.khandual@....com>,
        Marc Zyngier <maz@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-kernel@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 0/8] Relax sanity checking for mismatched AArch32 EL1

On 2020-04-15 03:01, Will Deacon wrote:
> Hi all,
> 
> For better or worse, there are SoCs in production where some, but not
> all of the CPUs, support AArch32 at EL1 and above. Right now, that
> results in "SANITY CHECK" warnings during boot and an unconditional
> kernel taint.
> 
> This patch series tries to do a bit better: the only time we care about
> AArch32 at EL1 is for KVM, so rather than throw our toys out of the
> pram, we can instead just disable support for 32-bit guests on these
> systems. In the unlikely scenario of a late CPU hotplug being the first
> time we notice that AArch32 is not available, then we fail the hotplug
> (right now we let the thing come online, which leads to hilarious
> results for any pre-existing 32-bit guests).
> 
> Feedback welcome,
> 
> Will
> 

Thanks Will, tested this series on QCOM SC7180 and SM8150 SoCs.

For the entire series,

Tested-by: saiprakash.ranjan@...eaurora.org

-Sai

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