linux-kernel - Re: [PATCH 0/1] Fix zero copy I/O on __get_user

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Message-Id: <20250507145018.385c0a090a0d61c06e985ad9@linux-foundation.org>
Date: Wed, 7 May 2025 14:50:18 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Pantelis Antoniou <p.antoniou@...tner.samsung.com>
Cc: <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>, Artem Krupotkin
 <artem.k@...sung.com>, Charles Briere <c.briere@...sung.com>, Wade
 Farnsworth <wade.farnsworth@...mens.com>
Subject: Re: [PATCH 0/1] Fix zero copy I/O on __get_user_pages allocated
 pages

On Wed, 7 May 2025 10:41:04 -0500 Pantelis Antoniou <p.antoniou@...tner.samsung.com> wrote:

> Updates to network filesystems enabled zero copy I/O by using the
> netfslib common accessors.

Updates by whom?  Are all the people who need to know about this being
cc'ed here?

> One example of that is the 9p filesystem which is commonly used in qemu
> based setups for sharing files with the host.
> 
> In our emulation environment we have noticed failing writes when performing
> I/O from a userspace mapped DRM GEM buffer object.
> The platform does not use VRAM, all graphics memory is regular DRAM memory,
> allocated via __get_free_pages

We should identify which kernel version(s) should be patched, please. 
6.16-rc1?  6.15?  -stable?

I often make these decisions but in this case I have far too little
information to be able to do that.

Thanks.