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b=upO/4sSUvr4fDbVkg/CmPCEbTufTzl9ounzSrpP+VfKQKxrzOlHqqdbJezlPQwnb2LpyNYxAqC9nLHX5Buqi6qF7innIIDOz42XxoKTLyviH2eiQ7bBfTSGZo+vcEJZVFAB/fQv9UogplD1Xtcmu+cnKdbyKHZ3a7RoNOiuBkmvcMWw+fJCqtqVKJuoOSdmuDOAduS0B6x1lWjt0zLf1JXI07s+uquadUOn46Vb0Mf/o5X6Ns3NtxWZOI1EWxjfarsEmisKsZ0WizytKiM095bw/+pxc3JCU3p4dmvM17C0orwktclWXpXgxgI6DWtwolDzoCLQ/VXywQ203Bv/n9Q== From: John Levon To: qemu-devel@nongnu.org Cc: Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , John Levon , Thanos Makatos , Thomas Huth , Matthew Rosato , Eric Farman , qemu-stable@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH 2/2] vfio: only check region info cache for initial regions Date: Tue, 14 Oct 2025 17:12:27 +0200 Message-ID: <20251014151227.2298892-3-john.levon@nutanix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251014151227.2298892-1-john.levon@nutanix.com> References: <20251014151227.2298892-1-john.levon@nutanix.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO4P123CA0197.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:1a4::22) To CH2PR02MB6760.namprd02.prod.outlook.com (2603:10b6:610:7f::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR02MB6760:EE_|SA0PR02MB7371:EE_ X-MS-Office365-Filtering-Correlation-Id: b15fc068-c4f8-4e45-b021-08de0b341aa2 x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.151.68; envelope-from=john.levon@nutanix.com; helo=mx0a-002c1b01.pphosted.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_BL_SPAMCOP_NET=1.347, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @nutanix.com) X-ZM-MESSAGEID: 1760454899662158500 Content-Type: text/plain; charset="utf-8" It is semantically valid for a VFIO device to increase the number of regions after initialization. In this case, we'd attempt to check for cached region info past the size of the ->reginfo array. Check for the region index and skip the cache in these cases. This also works around some VGPU use cases which appear to be a bug, where VFIO_DEVICE_QUERY_GFX_PLANE returns a region index beyond the reported ->num_regions. Fixes: 95cdb024 ("vfio: add region info cache") Signed-off-by: John Levon Reviewed-by: C=C3=A9dric Le Goater --- hw/vfio/device.c | 27 +++++++++++++++++++-------- 1 file changed, 19 insertions(+), 8 deletions(-) diff --git a/hw/vfio/device.c b/hw/vfio/device.c index 52079f4cf5..8b63e765ac 100644 --- a/hw/vfio/device.c +++ b/hw/vfio/device.c @@ -205,10 +205,19 @@ int vfio_device_get_region_info(VFIODevice *vbasedev,= int index, int fd =3D -1; int ret; =20 - /* check cache */ - if (vbasedev->reginfo[index] !=3D NULL) { - *info =3D vbasedev->reginfo[index]; - return 0; + /* + * We only set up the region info cache for the initial number of regi= ons. + * + * Since a VFIO device may later increase the number of regions then u= se + * such regions with an index past ->num_initial_regions, don't attemp= t to + * use the info cache in those cases. + */ + if (index < vbasedev->num_initial_regions) { + /* check cache */ + if (vbasedev->reginfo[index] !=3D NULL) { + *info =3D vbasedev->reginfo[index]; + return 0; + } } =20 *info =3D g_malloc0(argsz); @@ -236,10 +245,12 @@ retry: goto retry; } =20 - /* fill cache */ - vbasedev->reginfo[index] =3D *info; - if (vbasedev->region_fds !=3D NULL) { - vbasedev->region_fds[index] =3D fd; + if (index < vbasedev->num_initial_regions) { + /* fill cache */ + vbasedev->reginfo[index] =3D *info; + if (vbasedev->region_fds !=3D NULL) { + vbasedev->region_fds[index] =3D fd; + } } =20 return 0; --=20 2.43.0