linux-kernel - Re: [PATCH v14 3/5] KVM: arm64: Manage GCS access and registers for guests

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Message-ID: <ZwFMnhXGV_Nj31tE@finisterre.sirena.org.uk>
Date: Sat, 5 Oct 2024 15:26:38 +0100
From: Mark Brown <broonie@...nel.org>
To: Marc Zyngier <maz@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Shuah Khan <shuah@...nel.org>, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, kvmarm@...ts.linux.dev,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v14 3/5] KVM: arm64: Manage GCS access and registers for
 guests

On Sat, Oct 05, 2024 at 03:02:09PM +0100, Marc Zyngier wrote:
> Mark Brown <broonie@...nel.org> wrote:

> > Ah, I see.  I'd been under the impression that the generic machinery was
> > supposed to handle this already using the descriptions in
> > emulate-nested.c and we only needed handlers for more specific actions.

> From that very file:

> /*
>  * Map encoding to trap bits for exception reported with EC=0x18.
>  [...]
>  */

> Everything else needs special handling.

I see.  I had noticed that comment on that table but I didn't register
that the comment wound up applying to the whole file rather than being
about a specific part of the handling.  I'm a bit confused about how
things like the SVE traps I mentioned work here...

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