linux-kernel - Re: [PATCH v2] fuse: virtio_fs: fix page fault for DAX page address

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Message-ID: <20250905-einsicht-berglandschaft-8d4c6a189aa1@brauner>
Date: Fri,  5 Sep 2025 15:56:40 +0200
From: Christian Brauner <brauner@...nel.org>
To: Haiyue Wang <haiyuewa@....com>
Cc: Christian Brauner <brauner@...nel.org>,
	David Hildenbrand <david@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Stefan Hajnoczi <stefanha@...hat.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	Eugenio Pérez <eperezma@...hat.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	Alistair Popple <apopple@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] fuse: virtio_fs: fix page fault for DAX page address

On Thu, 04 Sep 2025 20:01:19 +0800, Haiyue Wang wrote:
> The commit ced17ee32a99 ("Revert "virtio: reject shm region if length is zero"")
> exposes the following DAX page fault bug (this fix the failure that getting shm
> region alway returns false because of zero length):
> 
> The commit 21aa65bf82a7 ("mm: remove callers of pfn_t functionality") handles
> the DAX physical page address incorrectly: the removed macro 'phys_to_pfn_t()'
> should be replaced with 'PHYS_PFN()'.
> 
> [...]

Applied to the vfs.fixes branch of the vfs/vfs.git tree.
Patches in the vfs.fixes branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.fixes

[1/1] fuse: virtio_fs: fix page fault for DAX page address
      https://git.kernel.org/vfs/vfs/c/e1bf212d0604