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b=zDQ7DhPPXzUlqoKNBb8BnWM4GyHm92Et8RSkz+bevPS2IX7GeywviQrkHg48m/JM2HL7TpPZBR9boaSzvMKzqeeCCVxuNy1Dug5p/mZoDIxfrY2iAo7mQiwYAX5zPXEXqg5Z+qKuOrwWPdsYQ3AHpJZ5ZR/lq2E8JBZPNEFxj1EybYeKqJUBlQd4oEb2I4Pq+qLA3UwKV2Lutxj25QXjIAnytc7ZjQpMUJ7be4vGYou5+6D7lzwAMFChBKz40vB0V036EBvV25rjsX4d9McBdozDLhFTzJRIPFxBamQQnPJKBZtPWvlFAkoGS3Fuk2PwKbzI29DyXA8WeLGcwZ6p5Q== 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 1/2] vfio: rename field to "num_initial_regions" Date: Tue, 14 Oct 2025 17:12:26 +0200 Message-ID: <20251014151227.2298892-2-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: e8a72fe5-02f6-46a0-1ff8-08de0b34199a 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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charset="utf-8" We set VFIODevice::num_regions at initialization time, and do not otherwise refresh it. As it is valid in theory for a VFIO device to later increase the number of supported regions, rename the field to "num_initial_regions" to better reflect its semantics. Signed-off-by: John Levon Reviewed-by: Alex Williamson Reviewed-by: C=C3=A9dric Le Goater --- include/hw/vfio/vfio-device.h | 2 +- hw/vfio-user/device.c | 2 +- hw/vfio/ccw.c | 4 ++-- hw/vfio/device.c | 12 ++++++------ hw/vfio/iommufd.c | 3 ++- hw/vfio/pci.c | 4 ++-- 6 files changed, 14 insertions(+), 13 deletions(-) diff --git a/include/hw/vfio/vfio-device.h b/include/hw/vfio/vfio-device.h index 7e9aed6d3c..0fe6c60ba2 100644 --- a/include/hw/vfio/vfio-device.h +++ b/include/hw/vfio/vfio-device.h @@ -74,7 +74,7 @@ typedef struct VFIODevice { VFIODeviceOps *ops; VFIODeviceIOOps *io_ops; unsigned int num_irqs; - unsigned int num_regions; + unsigned int num_initial_regions; unsigned int flags; VFIOMigration *migration; Error *migration_blocker; diff --git a/hw/vfio-user/device.c b/hw/vfio-user/device.c index 0609a7dc25..64ef35b320 100644 --- a/hw/vfio-user/device.c +++ b/hw/vfio-user/device.c @@ -134,7 +134,7 @@ static int vfio_user_device_io_get_region_info(VFIODevi= ce *vbasedev, VFIOUserFDs fds =3D { 0, 1, fd}; int ret; =20 - if (info->index > vbasedev->num_regions) { + if (info->index > vbasedev->num_initial_regions) { return -EINVAL; } =20 diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c index 9560b8d851..4d9588e7aa 100644 --- a/hw/vfio/ccw.c +++ b/hw/vfio/ccw.c @@ -484,9 +484,9 @@ static bool vfio_ccw_get_region(VFIOCCWDevice *vcdev, E= rror **errp) * We always expect at least the I/O region to be present. We also * may have a variable number of regions governed by capabilities. */ - if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) { + if (vdev->num_initial_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) { error_setg(errp, "vfio: too few regions (%u), expected at least %u= ", - vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1); + vdev->num_initial_regions, VFIO_CCW_CONFIG_REGION_INDEX= + 1); return false; } =20 diff --git a/hw/vfio/device.c b/hw/vfio/device.c index 64f8750389..52079f4cf5 100644 --- a/hw/vfio/device.c +++ b/hw/vfio/device.c @@ -257,7 +257,7 @@ int vfio_device_get_region_info_type(VFIODevice *vbased= ev, uint32_t type, { int i; =20 - for (i =3D 0; i < vbasedev->num_regions; i++) { + for (i =3D 0; i < vbasedev->num_initial_regions; i++) { struct vfio_info_cap_header *hdr; struct vfio_region_info_cap_type *cap_type; =20 @@ -466,7 +466,7 @@ void vfio_device_prepare(VFIODevice *vbasedev, VFIOCont= ainer *bcontainer, int i; =20 vbasedev->num_irqs =3D info->num_irqs; - vbasedev->num_regions =3D info->num_regions; + vbasedev->num_initial_regions =3D info->num_regions; vbasedev->flags =3D info->flags; vbasedev->reset_works =3D !!(info->flags & VFIO_DEVICE_FLAGS_RESET); =20 @@ -476,10 +476,10 @@ void vfio_device_prepare(VFIODevice *vbasedev, VFIOCo= ntainer *bcontainer, QLIST_INSERT_HEAD(&vfio_device_list, vbasedev, global_next); =20 vbasedev->reginfo =3D g_new0(struct vfio_region_info *, - vbasedev->num_regions); + vbasedev->num_initial_regions); if (vbasedev->use_region_fds) { - vbasedev->region_fds =3D g_new0(int, vbasedev->num_regions); - for (i =3D 0; i < vbasedev->num_regions; i++) { + vbasedev->region_fds =3D g_new0(int, vbasedev->num_initial_regions= ); + for (i =3D 0; i < vbasedev->num_initial_regions; i++) { vbasedev->region_fds[i] =3D -1; } } @@ -489,7 +489,7 @@ void vfio_device_unprepare(VFIODevice *vbasedev) { int i; =20 - for (i =3D 0; i < vbasedev->num_regions; i++) { + for (i =3D 0; i < vbasedev->num_initial_regions; i++) { g_free(vbasedev->reginfo[i]); if (vbasedev->region_fds !=3D NULL && vbasedev->region_fds[i] !=3D= -1) { close(vbasedev->region_fds[i]); diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c index 68470d552e..10fc065d20 100644 --- a/hw/vfio/iommufd.c +++ b/hw/vfio/iommufd.c @@ -663,7 +663,8 @@ found_container: vfio_iommufd_cpr_register_device(vbasedev); =20 trace_iommufd_cdev_device_info(vbasedev->name, devfd, vbasedev->num_ir= qs, - vbasedev->num_regions, vbasedev->flags); + vbasedev->num_initial_regions, + vbasedev->flags); return true; =20 err_listener_register: diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 06b06afc2b..8b8bc5a421 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -2975,9 +2975,9 @@ bool vfio_pci_populate_device(VFIOPCIDevice *vdev, Er= ror **errp) return false; } =20 - if (vbasedev->num_regions < VFIO_PCI_CONFIG_REGION_INDEX + 1) { + if (vbasedev->num_initial_regions < VFIO_PCI_CONFIG_REGION_INDEX + 1) { error_setg(errp, "unexpected number of io regions %u", - vbasedev->num_regions); + vbasedev->num_initial_regions); return false; } =20 --=20 2.43.0 From nobody Fri Nov 14 19:45:21 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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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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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: Alex Williamson 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