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b=Js5/7HqYShwXjneNtd826PZRaX8KnnSTK0pXw3I39NuksPk9ZDyASfZBkJBdlaCDaa+jW3mCBjFPA+boAWvJxXReL27nGbGwU1KMYPSScC4rZAmSu9iaOWuTSG2OAgB3uaapO8dLPbaKylOUUw8gCccbWe7tT3vcvHewqTZWbSC/D/8RXBcSrFe+OTjkJ3/5q2cT0j8r9oO3QC9fbvTnuQllitnJxGX8GhMDDO49HNbglWfoDEfMct06FfIsAqZYw8CqsERE33hb5t/vUa+EVMl6wxB9h7ih34EAJdMwu6DSxMXu1ulepbzJQqNuY/Lstk62cn5nEAh/L9Q/kHSQJg== From: John Levon To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Paolo Bonzini , Thanos Makatos , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Alex Williamson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , John Levon , John Johnson , Elena Ufimtseva , Jagannathan Raman Subject: [PATCH v3 12/23] vfio-user: implement VFIO_USER_REGION_READ/WRITE Date: Fri, 6 Jun 2025 17:10:44 -0700 Message-ID: <20250607001056.335310-13-john.levon@nutanix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250607001056.335310-1-john.levon@nutanix.com> References: <20250607001056.335310-1-john.levon@nutanix.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: PH8PR22CA0004.namprd22.prod.outlook.com (2603:10b6:510:2d1::19) To CH2PR02MB6760.namprd02.prod.outlook.com (2603:10b6:610:7f::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR02MB6760:EE_|PH0PR02MB8715:EE_ X-MS-Office365-Filtering-Correlation-Id: 143caafb-a789-4d10-fd15-08dda557d1f1 x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.155.12; envelope-from=john.levon@nutanix.com; helo=mx0b-002c1b01.pphosted.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.104, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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=ham 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: 1749255156402116600 Content-Type: text/plain; charset="utf-8" Originally-by: John Johnson Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John Levon --- hw/vfio-user/protocol.h | 12 +++++++ hw/vfio-user/device.c | 67 +++++++++++++++++++++++++++++++++++++++ hw/vfio-user/trace-events | 1 + 3 files changed, 80 insertions(+) diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h index 1878d44c51..8e6ccbe9e8 100644 --- a/hw/vfio-user/protocol.h +++ b/hw/vfio-user/protocol.h @@ -141,4 +141,16 @@ typedef struct { uint64_t offset; } VFIOUserRegionInfo; =20 +/* + * VFIO_USER_REGION_READ + * VFIO_USER_REGION_WRITE + */ +typedef struct { + VFIOUserHdr hdr; + uint64_t offset; + uint32_t region; + uint32_t count; + char data[]; +} VFIOUserRegionRW; + #endif /* VFIO_USER_PROTOCOL_H */ diff --git a/hw/vfio-user/device.c b/hw/vfio-user/device.c index 57793e6b2b..a767e4fb01 100644 --- a/hw/vfio-user/device.c +++ b/hw/vfio-user/device.c @@ -110,9 +110,76 @@ static int vfio_user_device_io_get_region_info(VFIODev= ice *vbasedev, return 0; } =20 +static int vfio_user_device_io_region_read(VFIODevice *vbasedev, uint8_t i= ndex, + off_t off, uint32_t count, + void *data) +{ + g_autofree VFIOUserRegionRW *msgp =3D NULL; + VFIOUserProxy *proxy =3D vbasedev->proxy; + int size =3D sizeof(*msgp) + count; + + if (count > proxy->max_xfer_size) { + return -EINVAL; + } + + msgp =3D g_malloc0(size); + vfio_user_request_msg(&msgp->hdr, VFIO_USER_REGION_READ, sizeof(*msgp)= , 0); + msgp->offset =3D off; + msgp->region =3D index; + msgp->count =3D count; + trace_vfio_user_region_rw(msgp->region, msgp->offset, msgp->count); + + vfio_user_send_wait(proxy, &msgp->hdr, NULL, size); + if (msgp->hdr.flags & VFIO_USER_ERROR) { + return -msgp->hdr.error_reply; + } else if (msgp->count > count) { + return -E2BIG; + } else { + memcpy(data, &msgp->data, msgp->count); + } + + return msgp->count; +} + +static int vfio_user_device_io_region_write(VFIODevice *vbasedev, uint8_t = index, + off_t off, unsigned count, + void *data, bool post) +{ + VFIOUserRegionRW *msgp =3D NULL; + VFIOUserProxy *proxy =3D vbasedev->proxy; + int size =3D sizeof(*msgp) + count; + int ret; + + if (count > proxy->max_xfer_size) { + return -EINVAL; + } + + msgp =3D g_malloc0(size); + vfio_user_request_msg(&msgp->hdr, VFIO_USER_REGION_WRITE, size, 0); + msgp->offset =3D off; + msgp->region =3D index; + msgp->count =3D count; + memcpy(&msgp->data, data, count); + trace_vfio_user_region_rw(msgp->region, msgp->offset, msgp->count); + + /* Ignore post: all writes are synchronous/non-posted. */ + vfio_user_send_wait(proxy, &msgp->hdr, NULL, 0); + if (msgp->hdr.flags & VFIO_USER_ERROR) { + ret =3D -msgp->hdr.error_reply; + } else { + ret =3D count; + } + + g_free(msgp); + return ret; +} + /* * Socket-based io_ops */ VFIODeviceIOOps vfio_user_device_io_ops_sock =3D { .get_region_info =3D vfio_user_device_io_get_region_info, + .region_read =3D vfio_user_device_io_region_read, + .region_write =3D vfio_user_device_io_region_write, + }; diff --git a/hw/vfio-user/trace-events b/hw/vfio-user/trace-events index 1860430301..3f5aebe7ac 100644 --- a/hw/vfio-user/trace-events +++ b/hw/vfio-user/trace-events @@ -8,3 +8,4 @@ vfio_user_send_write(uint16_t id, int wrote) " id 0x%x wrot= e 0x%x" vfio_user_version(uint16_t major, uint16_t minor, const char *caps) " majo= r %d minor %d caps: %s" vfio_user_get_info(uint32_t nregions, uint32_t nirqs) " #regions %d #irqs = %d" vfio_user_get_region_info(uint32_t index, uint32_t flags, uint64_t size) "= index %d flags 0x%x size 0x%"PRIx64 +vfio_user_region_rw(uint32_t region, uint64_t off, uint32_t count) " regio= n %d offset 0x%"PRIx64" count %d" --=20 2.43.0