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Thu, 18 Dec 2025 15:48:17 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id +KJLE0EiRGmuIwAAD6G6ig (envelope-from ); Thu, 18 Dec 2025 15:48:17 +0000 From: Juergen Gross To: linux-kernel@vger.kernel.org, v9fs@lists.linux.dev Cc: ariadne@ariadne.space, Juergen Gross , Eric Van Hensbergen , Latchesar Ionkov , Dominique Martinet , Christian Schoenebeck Subject: [PATCH] xen/9pfs: Fix data ring granting Date: Thu, 18 Dec 2025 16:48:14 +0100 Message-ID: <20251218154814.28938-1-jgross@suse.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Flag: NO X-Spam-Score: -3.01 X-Rspamd-Queue-Id: A65035BCEA X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:mid,suse.com:dkim,suse.com:email,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCPT_COUNT_SEVEN(0.00)[8]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; DKIM_TRACE(0.00)[suse.com:+] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Rspamd-Action: no action X-Spam-Level: Content-Type: text/plain; charset="utf-8" xen_9pfs_front_alloc_dataring() is granting the backend access to the data ring by using gnttab_grant_foreign_access() for each memory page of the ring. Unfortunately the pages passed to gnttab_grant_foreign_access() are not referenced by the consecutive PFNs, but by GFNs, which might be not consecutive if the system is running as a PV guest. Fix that by not using "virt_to_gfn(bytes) + i" as parameter, but "pfn_to_gfn(virt_to_pfn(bytes) + i)" instead. Fixes: 71ebd71921e4 ("xen/9pfs: connect to the backend") Signed-off-by: Juergen Gross --- net/9p/trans_xen.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c index 12f752a92332..a2ab633e78be 100644 --- a/net/9p/trans_xen.c +++ b/net/9p/trans_xen.c @@ -347,7 +347,8 @@ static int xen_9pfs_front_alloc_dataring(struct xenbus_= device *dev, } for (; i < (1 << order); i++) { ret =3D gnttab_grant_foreign_access( - dev->otherend_id, virt_to_gfn(bytes) + i, 0); + dev->otherend_id, + pfn_to_gfn(virt_to_pfn(bytes) + i), 0); if (ret < 0) goto out; ring->intf->ref[i] =3D ret; --=20 2.51.0