linux-kernel - Re: [PATCH v9 18/30] KVM: arm64: Support SME priority registers

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Message-ID: <24d06740-f8da-43d0-9e40-81323f6a9237@sirena.org.uk>
Date: Tue, 13 Jan 2026 19:08:29 +0000
From: Mark Brown <broonie@...nel.org>
To: Fuad Tabba <tabba@...gle.com>
Cc: Marc Zyngier <maz@...nel.org>, Joey Gouly <joey.gouly@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Will Deacon <will@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	Oliver Upton <oupton@...nel.org>, Dave Martin <Dave.Martin@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ben Horgan <ben.horgan@....com>,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
	Peter Maydell <peter.maydell@...aro.org>,
	Eric Auger <eric.auger@...hat.com>
Subject: Re: [PATCH v9 18/30] KVM: arm64: Support SME priority registers

On Mon, Jan 12, 2026 at 11:59:22AM +0000, Fuad Tabba wrote:
> On Tue, 23 Dec 2025 at 01:22, Mark Brown <broonie@...nel.org> wrote:

> > +       /*
> > +        * We block SME priorities so SMPRIMAP_EL2 is RES0, however we
> > +        * do not have traps to block access so the guest might have
> > +        * updated the state, overwrite anything there.
> 
> nit: overwrite -> overwriting

> > +        */
> > +       __vcpu_assign_sys_reg(vcpu, SMPRIMAP_EL2, 0);
> >  }

My original is correct here - the action we are taking is that we will
overwrite the value.  To use overwriting we'd need something more like
"handle this by overwriting anything there".

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