linux-kernel - Re: [PATCH v6 01/26] fuse: Fix dax truncate/punch

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Message-ID: <20250206143032.GA400591@fedora>
Date: Thu, 6 Feb 2025 09:30:32 -0500
From: Stefan Hajnoczi <stefanha@...hat.com>
To: Vivek Goyal <vgoyal@...hat.com>
Cc: Dan Williams <dan.j.williams@...el.com>,
	Alistair Popple <apopple@...dia.com>, akpm@...ux-foundation.org,
	linux-mm@...ck.org, alison.schofield@...el.com, lina@...hilina.net,
	zhang.lyra@...il.com, gerald.schaefer@...ux.ibm.com,
	vishal.l.verma@...el.com, dave.jiang@...el.com, logang@...tatee.com,
	bhelgaas@...gle.com, jack@...e.cz, jgg@...pe.ca,
	catalin.marinas@....com, will@...nel.org, mpe@...erman.id.au,
	npiggin@...il.com, dave.hansen@...ux.intel.com, ira.weiny@...el.com,
	willy@...radead.org, djwong@...nel.org, tytso@....edu,
	linmiaohe@...wei.com, david@...hat.com, peterx@...hat.com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
	nvdimm@...ts.linux.dev, linux-cxl@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-xfs@...r.kernel.org, jhubbard@...dia.com, hch@....de,
	david@...morbit.com, chenhuacai@...nel.org, kernel@...0n.name,
	loongarch@...ts.linux.dev, Hanna Czenczek <hreitz@...hat.com>,
	German Maglione <gmaglione@...hat.com>,
	Albert Esteve <aesteve@...hat.com>
Subject: Re: [PATCH v6 01/26] fuse: Fix dax truncate/punch_hole fault path

On Thu, Feb 06, 2025 at 08:37:07AM -0500, Vivek Goyal wrote:
> And then there are challenges at QEMU level. virtiofsd needs additional
> vhost-user commands to implement DAX and these never went upstream in
> QEMU. I hope these challenges are sorted at some point of time.

Albert Esteve has been working on QEMU support:
https://lore.kernel.org/qemu-devel/20240912145335.129447-1-aesteve@redhat.com/

He has a viable solution. I think the remaining issue is how to best
structure the memory regions. The reason for slow progress is not
because it can't be done, it's probably just because this is a
background task.

Please discuss with Albert if QEMU support is urgent.

Stefan

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