linux-kernel - Re: [PATCH] 9p/virtio: restrict page pinning to user_backed

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Message-ID: <815151.1766145968@warthog.procyon.org.uk>
Date: Fri, 19 Dec 2025 12:06:08 +0000
From: David Howells <dhowells@...hat.com>
To: Christian Schoenebeck <linux_oss@...debyte.com>
Cc: dhowells@...hat.com, Eric Van Hensbergen <ericvh@...nel.org>,
    Latchesar Ionkov <lucho@...kov.net>, asmadeus@...ewreck.org,
    Chris Arges <carges@...udflare.com>, v9fs@...ts.linux.dev,
    linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>,
    linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] 9p/virtio: restrict page pinning to user_backed_iter() iovec

Christian Schoenebeck <linux_oss@...debyte.com> wrote:

> > -	if (!iov_iter_is_kvec(data)) {
> > +	if (user_backed_iter(data)) {

That looks wrong.  If the I/O is coming through netfslib, you should never see
ITER_UBUF or ITER_IOVEC in the filesystem.

David