linux-kernel - Re: [PATCH 0/7] arm64/boot: Enable EL2 requirements for FEAT

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Message-ID: <86tta9wghj.wl-maz@kernel.org>
Date: Wed, 08 Jan 2025 14:02:48 +0000
From: Marc Zyngier <maz@...nel.org>
To: Rob Herring <robh@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Will Deacon <will@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Mark Rutland <mark.rutland@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Jonathan Corbet <corbet@....net>,
	Eric Auger <eric.auger@...hat.com>,
	kvmarm@...ts.linux.dev,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9

On Wed, 08 Jan 2025 13:47:16 +0000,
Rob Herring <robh@...nel.org> wrote:
>
> Out of curiosity, why do we care if there's a splat or not for a not
> well behaved guest?

The only well behaved guest is the one that doesn't run.

Getting that splat is an indication of a *KVM* bug which fails to
correctly emulate the architecture (feature not advertised ->
instructions must silently UNDEF).

	M.

-- 
Without deviation from the norm, progress is not possible.