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b=xRJ2qbQMOKsDfCB2jtewnTwtaItUGj7Lym4O1UM2Fn6hXGPkyB3ENqW4pJHtQx/TMgV85CZ6R/EadexsDbE9q6Vya6Ga6YjUVVHORfJK/5SMUN4IHjWgZ9YXvTd1kigLFzhSFtsOdBBEvH29baED7/pS0lwI4EhQCWpDEKctxHr+3uGrEhafHvLyASgzlkCiQIydfqQaUF7LkC9lpb5zbE8gO1Ha4B5+4ipup47MdLHkHnrnmnmsfFxqtNkIFEbS5ewe2d1Z4RvY4BkyF2RHgMy2XzcRlpc5bJUE1OETTYIaLIdM3l5EbbNlk9dhDRKmAFRxphzpwrMCxxEbWQKZ/g== From: John Levon To: qemu-devel@nongnu.org Cc: Thanos Makatos , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , John Levon , Alex Williamson , Paolo Bonzini , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , John Johnson , Elena Ufimtseva , Jagannathan Raman Subject: [PATCH v4 09/19] vfio-user: implement VFIO_USER_DEVICE_GET/SET_IRQ* Date: Thu, 19 Jun 2025 06:31:43 -0700 Message-ID: <20250619133154.264786-10-john.levon@nutanix.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250619133154.264786-1-john.levon@nutanix.com> References: <20250619133154.264786-1-john.levon@nutanix.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO3P265CA0025.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:387::6) To CH2PR02MB6760.namprd02.prod.outlook.com (2603:10b6:610:7f::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR02MB6760:EE_|PH0PR02MB9383:EE_ X-MS-Office365-Filtering-Correlation-Id: 8edbee53-830f-4785-2f61-08ddaf35b819 x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|366016; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.151.68; envelope-from=john.levon@nutanix.com; helo=mx0a-002c1b01.pphosted.com X-Spam_score_int: -46 X-Spam_score: -4.7 X-Spam_bar: ---- X-Spam_report: (-4.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.897, 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: 1750340222501116600 Content-Type: text/plain; charset="utf-8" IRQ setup uses the same semantics as the traditional vfio path, but we need to share the corresponding file descriptors with the server as necessary. Originally-by: John Johnson Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John Levon --- hw/vfio-user/protocol.h | 25 ++++++++ hw/vfio-user/device.c | 121 ++++++++++++++++++++++++++++++++++++++ hw/vfio-user/trace-events | 2 + 3 files changed, 148 insertions(+) diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h index 0cd32ad71a..48144b2c33 100644 --- a/hw/vfio-user/protocol.h +++ b/hw/vfio-user/protocol.h @@ -138,6 +138,31 @@ typedef struct { uint64_t offset; } VFIOUserRegionInfo; =20 +/* + * VFIO_USER_DEVICE_GET_IRQ_INFO + * imported from struct vfio_irq_info + */ +typedef struct { + VFIOUserHdr hdr; + uint32_t argsz; + uint32_t flags; + uint32_t index; + uint32_t count; +} VFIOUserIRQInfo; + +/* + * VFIO_USER_DEVICE_SET_IRQS + * imported from struct vfio_irq_set + */ +typedef struct { + VFIOUserHdr hdr; + uint32_t argsz; + uint32_t flags; + uint32_t index; + uint32_t start; + uint32_t count; +} VFIOUserIRQSet; + /* * VFIO_USER_REGION_READ * VFIO_USER_REGION_WRITE diff --git a/hw/vfio-user/device.c b/hw/vfio-user/device.c index 8ec5aba632..0d7ed9c5ba 100644 --- a/hw/vfio-user/device.c +++ b/hw/vfio-user/device.c @@ -108,6 +108,125 @@ static int vfio_user_device_io_get_region_info(VFIODe= vice *vbasedev, return 0; } =20 +static int vfio_user_device_io_get_irq_info(VFIODevice *vbasedev, + struct vfio_irq_info *info) +{ + VFIOUserProxy *proxy =3D vbasedev->proxy; + VFIOUserIRQInfo msg; + + memset(&msg, 0, sizeof(msg)); + vfio_user_request_msg(&msg.hdr, VFIO_USER_DEVICE_GET_IRQ_INFO, + sizeof(msg), 0); + msg.argsz =3D info->argsz; + msg.index =3D info->index; + + vfio_user_send_wait(proxy, &msg.hdr, NULL, 0); + if (msg.hdr.flags & VFIO_USER_ERROR) { + return -msg.hdr.error_reply; + } + trace_vfio_user_get_irq_info(msg.index, msg.flags, msg.count); + + memcpy(info, &msg.argsz, sizeof(*info)); + return 0; +} + +static int irq_howmany(int *fdp, uint32_t cur, uint32_t max) +{ + int n =3D 0; + + if (fdp[cur] !=3D -1) { + do { + n++; + } while (n < max && fdp[cur + n] !=3D -1); + } else { + do { + n++; + } while (n < max && fdp[cur + n] =3D=3D -1); + } + + return n; +} + +static int vfio_user_device_io_set_irqs(VFIODevice *vbasedev, + struct vfio_irq_set *irq) +{ + VFIOUserProxy *proxy =3D vbasedev->proxy; + g_autofree VFIOUserIRQSet *msgp =3D NULL; + uint32_t size, nfds, send_fds, sent_fds, max; + + if (irq->argsz < sizeof(*irq)) { + error_printf("vfio_user_set_irqs argsz too small\n"); + return -EINVAL; + } + + /* + * Handle simple case + */ + if ((irq->flags & VFIO_IRQ_SET_DATA_EVENTFD) =3D=3D 0) { + size =3D sizeof(VFIOUserHdr) + irq->argsz; + msgp =3D g_malloc0(size); + + vfio_user_request_msg(&msgp->hdr, VFIO_USER_DEVICE_SET_IRQS, size,= 0); + msgp->argsz =3D irq->argsz; + msgp->flags =3D irq->flags; + msgp->index =3D irq->index; + msgp->start =3D irq->start; + msgp->count =3D irq->count; + trace_vfio_user_set_irqs(msgp->index, msgp->start, msgp->count, + msgp->flags); + + vfio_user_send_wait(proxy, &msgp->hdr, NULL, 0); + if (msgp->hdr.flags & VFIO_USER_ERROR) { + return -msgp->hdr.error_reply; + } + + return 0; + } + + /* + * Calculate the number of FDs to send + * and adjust argsz + */ + nfds =3D (irq->argsz - sizeof(*irq)) / sizeof(int); + irq->argsz =3D sizeof(*irq); + msgp =3D g_malloc0(sizeof(*msgp)); + /* + * Send in chunks if over max_send_fds + */ + for (sent_fds =3D 0; nfds > sent_fds; sent_fds +=3D send_fds) { + VFIOUserFDs *arg_fds, loop_fds; + + /* must send all valid FDs or all invalid FDs in single msg */ + max =3D nfds - sent_fds; + if (max > proxy->max_send_fds) { + max =3D proxy->max_send_fds; + } + send_fds =3D irq_howmany((int *)irq->data, sent_fds, max); + + vfio_user_request_msg(&msgp->hdr, VFIO_USER_DEVICE_SET_IRQS, + sizeof(*msgp), 0); + msgp->argsz =3D irq->argsz; + msgp->flags =3D irq->flags; + msgp->index =3D irq->index; + msgp->start =3D irq->start + sent_fds; + msgp->count =3D send_fds; + trace_vfio_user_set_irqs(msgp->index, msgp->start, msgp->count, + msgp->flags); + + loop_fds.send_fds =3D send_fds; + loop_fds.recv_fds =3D 0; + loop_fds.fds =3D (int *)irq->data + sent_fds; + arg_fds =3D loop_fds.fds[0] !=3D -1 ? &loop_fds : NULL; + + vfio_user_send_wait(proxy, &msgp->hdr, arg_fds, 0); + if (msgp->hdr.flags & VFIO_USER_ERROR) { + return -msgp->hdr.error_reply; + } + } + + return 0; +} + static int vfio_user_device_io_region_read(VFIODevice *vbasedev, uint8_t i= ndex, off_t off, uint32_t count, void *data) @@ -177,6 +296,8 @@ static int vfio_user_device_io_region_write(VFIODevice = *vbasedev, uint8_t index, */ VFIODeviceIOOps vfio_user_device_io_ops_sock =3D { .get_region_info =3D vfio_user_device_io_get_region_info, + .get_irq_info =3D vfio_user_device_io_get_irq_info, + .set_irqs =3D vfio_user_device_io_set_irqs, .region_read =3D vfio_user_device_io_region_read, .region_write =3D vfio_user_device_io_region_write, =20 diff --git a/hw/vfio-user/trace-events b/hw/vfio-user/trace-events index 3f5aebe7ac..053f5932eb 100644 --- a/hw/vfio-user/trace-events +++ b/hw/vfio-user/trace-events @@ -9,3 +9,5 @@ vfio_user_version(uint16_t major, uint16_t minor, const cha= r *caps) " major %d m 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" +vfio_user_get_irq_info(uint32_t index, uint32_t flags, uint32_t count) " i= ndex %d flags 0x%x count %d" +vfio_user_set_irqs(uint32_t index, uint32_t start, uint32_t count, uint32_= t flags) " index %d start %d count %d flags 0x%x" --=20 2.43.0