linux-kernel - Re: [RFC PATCH v2 0/9] KVM: Enable Nested Virt selftests

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Message-ID: <aDoj6DjbISGQFwbd@linux.dev>
Date: Fri, 30 May 2025 14:32:24 -0700
From: Oliver Upton <oliver.upton@...ux.dev>
To: Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	maz@...nel.org, joey.gouly@....com, suzuki.poulose@....com,
	yuzenghui@...wei.com, seanjc@...gle.com,
	darren@...amperecomputing.com
Subject: Re: [RFC PATCH v2 0/9] KVM: Enable Nested Virt selftests

Hi Ganapat,

On Mon, May 12, 2025 at 03:52:42AM -0700, Ganapatrao Kulkarni wrote:
> This patch series makes the selftest work with NV enabled. The guest code
> is run in vEL2 instead of EL1. We add a command line option to enable
> testing of NV. The NV tests are disabled by default.
> 
> Modified around 12 selftests in this series.

Thanks for sharing this, we sorely need testing for NV.

I haven't looked at these patches thoroughly but I have some overall
feedback. What I'd like to see is that we force *all* KVM selftests
to run in VHE EL2 without an opt-in/opt-out. The user had to boot their
kernel with kvm-arm.mode=nested, so imposing NV testing on them feels
reasonable.

Thanks,
Oliver