linux-kernel - Re: [PATCH v7 5/6] KVM: arm64: Initialize the ptdump parser with stage-2 attributes

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Message-ID: <ZoxCQTub5NH3lLrE@linux.dev>
Date: Mon, 8 Jul 2024 19:47:13 +0000
From: Oliver Upton <oliver.upton@...ux.dev>
To: Sebastian Ene <sebastianene@...gle.com>
Cc: akpm@...ux-foundation.org, alexghiti@...osinc.com, ankita@...dia.com,
	ardb@...nel.org, catalin.marinas@....com,
	christophe.leroy@...roup.eu, james.morse@....com,
	vdonnefort@...gle.com, mark.rutland@....com, maz@...nel.org,
	rananta@...gle.com, ryan.roberts@....com, shahuang@...hat.com,
	suzuki.poulose@....com, will@...nel.org, yuzenghui@...wei.com,
	kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: Re: [PATCH v7 5/6] KVM: arm64: Initialize the ptdump parser with
 stage-2 attributes

On Mon, Jul 01, 2024 at 02:17:53PM +0000, Sebastian Ene wrote:
> > <snip>
> > 
> > > +	}, {
> > > +		.mask	= PTE_NG,
> > > +		.val	= PTE_NG,
> > > +		.set	= "FnXS",
> > > +		.clear	= "  ",
> > > +	}, {
> > > +		.mask	= PTE_CONT | PTE_VALID,
> > > +		.val	= PTE_CONT | PTE_VALID,
> > > +		.set	= "CON",
> > > +		.clear	= "   ",
> > > +	}, {
> > 
> > </snip>
> > 
> > Neither of these bits are used at stage-2, why have descriptors for
> > them?
> > 
> 
> Atm, we don't make use of the contiguous bit in stage-2 in upstream (but
> we have it in some experimental patches). I can remove this, no hard
> feelings for them.

Yes, please drop them. I'll nag whoever adds contpte support for stage-2
to add them back :)

-- 
Thanks,
Oliver