linux-kernel - Re: [PATCH 3/8] arm64: cpufeature: Add CPU capability for AArch32 EL1 support

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Message-ID: <a83a19eb-9051-0a43-0bac-353f67d93d79@arm.com>
Date:   Wed, 15 Apr 2020 11:13:54 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     will@...nel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu
Cc:     linux-kernel@...r.kernel.org, mark.rutland@....com, maz@...nel.org,
        anshuman.khandual@....com, catalin.marinas@....com,
        saiprakash.ranjan@...eaurora.org, dianders@...omium.org,
        kernel-team@...roid.com
Subject: Re: [PATCH 3/8] arm64: cpufeature: Add CPU capability for AArch32 EL1
 support

On 04/14/2020 10:31 PM, Will Deacon wrote:
> Although we emit a "SANITY CHECK" warning and taint the kernel if we
> detect a CPU mismatch for AArch32 support at EL1, we still online the
> CPU with disastrous consequences for any running 32-bit VMs.
> 
> Introduce a capability for AArch32 support at EL1 so that late onlining
> of incompatible CPUs is forbidden.
> 
> Signed-off-by: Will Deacon <will@...nel.org>

One of the other important missing sanity check for KVM is the VMID 
width check. I will code something up.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>