linux-kernel - Re: [PATCH v2 06/11] KVM: arm64: hide MOPS from guests

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Message-ID: <ZH4DBoFv2CkoxFmX@linux.dev>
Date:   Mon, 5 Jun 2023 15:45:10 +0000
From:   Oliver Upton <oliver.upton@...ux.dev>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Kristina Martsenko <kristina.martsenko@....com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Luis Machado <luis.machado@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/11] KVM: arm64: hide MOPS from guests

On Sat, Jun 03, 2023 at 09:42:18AM +0100, Marc Zyngier wrote:
> On Tue, 09 May 2023 15:22:30 +0100,
> Kristina Martsenko <kristina.martsenko@....com> wrote:
> > 
> > As FEAT_MOPS is not supported in guests yet, hide it from the ID
> > registers for guests.
> > 
> > The MOPS instructions are UNDEFINED in guests as HCRX_EL2.MSCEn is not
> > set in HCRX_GUEST_FLAGS, and will take an exception to EL1 if executed.
> > 
> > Acked-by: Catalin Marinas <catalin.marinas@....com>
> > Signed-off-by: Kristina Martsenko <kristina.martsenko@....com>
> 
> This is very likely to clash with Jing's series that completely
> reworks the whole idreg series, but as long as this is on its own
> branch, we can deal with that.

Yup, we will definitely want to get that ironed out. I'll pull Catalin's
branch when this all gets queued up.

Acked-by: Oliver Upton <oliver.upton@...ux.dev>

-- 
Thanks,
Oliver