linux-kernel - Re: [RFC PATCH 26/39] KVM: guest_memfd: Track faultability within a struct kvm_gmem

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Message-ID: <20241017171639.GN3559746@nvidia.com>
Date: Thu, 17 Oct 2024 14:16:39 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: David Hildenbrand <david@...hat.com>
Cc: Peter Xu <peterx@...hat.com>, Ackerley Tng <ackerleytng@...gle.com>,
	tabba@...gle.com, quic_eberman@...cinc.com, roypat@...zon.co.uk,
	rientjes@...gle.com, fvdl@...gle.com, jthoughton@...gle.com,
	seanjc@...gle.com, pbonzini@...hat.com, zhiquan1.li@...el.com,
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	oliver.upton@...ux.dev, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, kvm@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: Re: [RFC PATCH 26/39] KVM: guest_memfd: Track faultability within a
 struct kvm_gmem_private

On Thu, Oct 17, 2024 at 07:11:46PM +0200, David Hildenbrand wrote:
> On 17.10.24 18:47, Jason Gunthorpe wrote:
> > On Thu, Oct 17, 2024 at 10:58:29AM -0400, Peter Xu wrote:
> > 
> > > My question was more torwards whether gmemfd could still expose the
> > > possibility to be used in VA forms to other modules that may not support
> > > fd+offsets yet.
> > 
> > I keep hearing they don't want to support page pinning on a guestmemfd
> > mapping, so VA based paths could not work.
> 
> For shared pages it absolutely must work. That's what I keep hearing :)

Oh that's confusing. I assume non longterm pins desired on shared
pages though??

Jason