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Message-ID: <20250318125751.GQ9311@nvidia.com>
Date: Tue, 18 Mar 2025 09:57:51 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Marc Zyngier <maz@...nel.org>
Cc: ankita@...dia.com, oliver.upton@...ux.dev, joey.gouly@....com,
	suzuki.poulose@....com, yuzenghui@...wei.com,
	catalin.marinas@....com, will@...nel.org, ryan.roberts@....com,
	shahuang@...hat.com, lpieralisi@...nel.org, david@...hat.com,
	aniketa@...dia.com, cjia@...dia.com, kwankhede@...dia.com,
	targupta@...dia.com, vsethi@...dia.com, acurrid@...dia.com,
	apopple@...dia.com, jhubbard@...dia.com, danw@...dia.com,
	zhiw@...dia.com, mochs@...dia.com, udhoke@...dia.com,
	dnigam@...dia.com, alex.williamson@...hat.com,
	sebastianene@...gle.com, coltonlewis@...gle.com,
	kevin.tian@...el.com, yi.l.liu@...el.com, ardb@...nel.org,
	akpm@...ux-foundation.org, gshan@...hat.com, linux-mm@...ck.org,
	ddutile@...hat.com, tabba@...gle.com, qperret@...gle.com,
	seanjc@...gle.com, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/1] KVM: arm64: Allow cacheable stage 2 mapping using
 VMA flags

On Mon, Mar 10, 2025 at 11:54:52AM +0000, Marc Zyngier wrote:

> Which brings me to the next point: FWB is not discoverable from
> userspace. How do you expect a VMM to know what it can or cannot do?

If you add a check at memslot creation time then simply fail the
memslot.

There is nothing the VMM can do except completely fail. There is no
alternative path here where a cachable VMA can be safely made
non-cachable for the guest?

Jason

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