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b=QpcndXHRdisuh7K36dVM9mxELGAUiNsF0/C7xBqyHWwIkU+Oh4wLE3E54UMWJUs/90oQuA01lLbjspGYS0gyy/Nt95G9PSo5OLSLkS/9Gq7EBJ19wo9K2XhZgL7XiIEYoGtAVrljic0y2rkQxW+FZwiA6xvRQ6Azp62VwfL4R6qy3xLOqnYiCp13zysJQ29Xnvz1WhAxKb4Rs0TY/3N4QCKyz45NkMWWb50TAPtTtdemakrAxP899N3QNvsX1OikZ6cCqiQjOHrybWYPwubsRPGt6SVWJJk2mcatEcwKQkZMmt6PC/9yxKemze8a4JVeompEPn+3tIBw6bUYjd/ztw== 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 19/23] vfio-user: implement VFIO_USER_DMA_READ/WRITE Date: Fri, 6 Jun 2025 17:10:51 -0700 Message-ID: <20250607001056.335310-20-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_|CO1PR02MB8441:EE_ X-MS-Office365-Filtering-Correlation-Id: f926a1f2-69ee-450f-26b1-08dda557d818 x-proofpoint-crosstenant: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|7416014; 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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: 1749255306151116600 Content-Type: text/plain; charset="utf-8" Unlike most other messages, this is a server->client message, for when a server wants to do "DMA"; this is slow, so normally the server has memory directly mapped instead. Originally-by: John Johnson Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John Levon --- hw/vfio-user/protocol.h | 13 ++++- hw/vfio-user/proxy.h | 3 ++ hw/vfio-user/pci.c | 111 ++++++++++++++++++++++++++++++++++++++++ hw/vfio-user/proxy.c | 84 ++++++++++++++++++++++++++++++ 4 files changed, 210 insertions(+), 1 deletion(-) diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h index 4fa6d03b3f..8f589faef4 100644 --- a/hw/vfio-user/protocol.h +++ b/hw/vfio-user/protocol.h @@ -203,7 +203,18 @@ typedef struct { char data[]; } VFIOUserRegionRW; =20 -/*imported from struct vfio_bitmap */ +/* + * VFIO_USER_DMA_READ + * VFIO_USER_DMA_WRITE + */ +typedef struct { + VFIOUserHdr hdr; + uint64_t offset; + uint32_t count; + char data[]; +} VFIOUserDMARW; + +/* imported from struct vfio_bitmap */ typedef struct { uint64_t pgsize; uint64_t size; diff --git a/hw/vfio-user/proxy.h b/hw/vfio-user/proxy.h index 01fed3f17d..8f2d529846 100644 --- a/hw/vfio-user/proxy.h +++ b/hw/vfio-user/proxy.h @@ -104,6 +104,7 @@ void vfio_user_set_handler(VFIODevice *vbasedev, bool vfio_user_validate_version(VFIOUserProxy *proxy, Error **errp); =20 VFIOUserFDs *vfio_user_getfds(int numfds); +void vfio_user_putfds(VFIOUserMsg *msg); =20 void vfio_user_request_msg(VFIOUserHdr *hdr, uint16_t cmd, uint32_t size, uint32_t flags); @@ -112,5 +113,7 @@ void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUser= Hdr *hdr, VFIOUserFDs *fds, int rsize); void vfio_user_send_nowait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, VFIOUserFDs *fds, int rsize); +void vfio_user_send_reply(VFIOUserProxy *proxy, VFIOUserHdr *hdr, int size= ); +void vfio_user_send_error(VFIOUserProxy *proxy, VFIOUserHdr *hdr, int erro= r); =20 #endif /* VFIO_USER_PROXY_H */ diff --git a/hw/vfio-user/pci.c b/hw/vfio-user/pci.c index 2bc71b9b54..095f32604d 100644 --- a/hw/vfio-user/pci.c +++ b/hw/vfio-user/pci.c @@ -11,6 +11,7 @@ =20 #include #include "qemu/osdep.h" +#include "qemu/error-report.h" =20 #include "hw/qdev-properties.h" #include "hw/vfio/pci.h" @@ -82,6 +83,95 @@ static void vfio_user_msix_teardown(VFIOPCIDevice *vdev) vdev->msix->pba_region =3D NULL; } =20 +static void vfio_user_dma_read(VFIOPCIDevice *vdev, VFIOUserDMARW *msg) +{ + PCIDevice *pdev =3D &vdev->pdev; + VFIOUserProxy *proxy =3D vdev->vbasedev.proxy; + VFIOUserDMARW *res; + MemTxResult r; + size_t size; + + if (msg->hdr.size < sizeof(*msg)) { + vfio_user_send_error(proxy, &msg->hdr, EINVAL); + return; + } + if (msg->count > proxy->max_xfer_size) { + vfio_user_send_error(proxy, &msg->hdr, E2BIG); + return; + } + + /* switch to our own message buffer */ + size =3D msg->count + sizeof(VFIOUserDMARW); + res =3D g_malloc0(size); + memcpy(res, msg, sizeof(*res)); + g_free(msg); + + r =3D pci_dma_read(pdev, res->offset, &res->data, res->count); + + switch (r) { + case MEMTX_OK: + if (res->hdr.flags & VFIO_USER_NO_REPLY) { + g_free(res); + return; + } + vfio_user_send_reply(proxy, &res->hdr, size); + break; + case MEMTX_ERROR: + vfio_user_send_error(proxy, &res->hdr, EFAULT); + break; + case MEMTX_DECODE_ERROR: + vfio_user_send_error(proxy, &res->hdr, ENODEV); + break; + case MEMTX_ACCESS_ERROR: + vfio_user_send_error(proxy, &res->hdr, EPERM); + break; + default: + error_printf("vfio_user_dma_read unknown error %d\n", r); + vfio_user_send_error(vdev->vbasedev.proxy, &res->hdr, EINVAL); + } +} + +static void vfio_user_dma_write(VFIOPCIDevice *vdev, VFIOUserDMARW *msg) +{ + PCIDevice *pdev =3D &vdev->pdev; + VFIOUserProxy *proxy =3D vdev->vbasedev.proxy; + MemTxResult r; + + if (msg->hdr.size < sizeof(*msg)) { + vfio_user_send_error(proxy, &msg->hdr, EINVAL); + return; + } + /* make sure transfer count isn't larger than the message data */ + if (msg->count > msg->hdr.size - sizeof(*msg)) { + vfio_user_send_error(proxy, &msg->hdr, E2BIG); + return; + } + + r =3D pci_dma_write(pdev, msg->offset, &msg->data, msg->count); + + switch (r) { + case MEMTX_OK: + if ((msg->hdr.flags & VFIO_USER_NO_REPLY) =3D=3D 0) { + vfio_user_send_reply(proxy, &msg->hdr, sizeof(msg->hdr)); + } else { + g_free(msg); + } + break; + case MEMTX_ERROR: + vfio_user_send_error(proxy, &msg->hdr, EFAULT); + break; + case MEMTX_DECODE_ERROR: + vfio_user_send_error(proxy, &msg->hdr, ENODEV); + break; + case MEMTX_ACCESS_ERROR: + vfio_user_send_error(proxy, &msg->hdr, EPERM); + break; + default: + error_printf("vfio_user_dma_write unknown error %d\n", r); + vfio_user_send_error(vdev->vbasedev.proxy, &msg->hdr, EINVAL); + } +} + /* * Incoming request message callback. * @@ -89,7 +179,28 @@ static void vfio_user_msix_teardown(VFIOPCIDevice *vdev) */ static void vfio_user_pci_process_req(void *opaque, VFIOUserMsg *msg) { + VFIOPCIDevice *vdev =3D opaque; + VFIOUserHdr *hdr =3D msg->hdr; + + /* no incoming PCI requests pass FDs */ + if (msg->fds !=3D NULL) { + vfio_user_send_error(vdev->vbasedev.proxy, hdr, EINVAL); + vfio_user_putfds(msg); + return; + } =20 + switch (hdr->command) { + case VFIO_USER_DMA_READ: + vfio_user_dma_read(vdev, (VFIOUserDMARW *)hdr); + break; + case VFIO_USER_DMA_WRITE: + vfio_user_dma_write(vdev, (VFIOUserDMARW *)hdr); + break; + default: + error_printf("vfio_user_pci_process_req unknown cmd %d\n", + hdr->command); + vfio_user_send_error(vdev->vbasedev.proxy, hdr, ENOSYS); + } } =20 /* diff --git a/hw/vfio-user/proxy.c b/hw/vfio-user/proxy.c index 6d1446c38b..0935b72e9f 100644 --- a/hw/vfio-user/proxy.c +++ b/hw/vfio-user/proxy.c @@ -362,6 +362,10 @@ static int vfio_user_recv_one(VFIOUserProxy *proxy) *msg->hdr =3D hdr; data =3D (char *)msg->hdr + sizeof(hdr); } else { + if (hdr.size > proxy->max_xfer_size + sizeof(VFIOUserDMARW)) { + error_setg(&local_err, "vfio_user_recv request larger than max= "); + goto err; + } buf =3D g_malloc0(hdr.size); memcpy(buf, &hdr, sizeof(hdr)); data =3D buf + sizeof(hdr); @@ -676,6 +680,33 @@ void vfio_user_send_wait(VFIOUserProxy *proxy, VFIOUse= rHdr *hdr, qemu_mutex_unlock(&proxy->lock); } =20 +/* + * async send - msg can be queued, but will be freed when sent + */ +static void vfio_user_send_async(VFIOUserProxy *proxy, VFIOUserHdr *hdr, + VFIOUserFDs *fds) +{ + VFIOUserMsg *msg; + int ret; + + if (!(hdr->flags & (VFIO_USER_NO_REPLY | VFIO_USER_REPLY))) { + error_printf("vfio_user_send_async on sync message\n"); + return; + } + + QEMU_LOCK_GUARD(&proxy->lock); + + msg =3D vfio_user_getmsg(proxy, hdr, fds); + msg->id =3D hdr->id; + msg->rsize =3D 0; + msg->type =3D VFIO_MSG_ASYNC; + + ret =3D vfio_user_send_queued(proxy, msg); + if (ret < 0) { + vfio_user_recycle(proxy, msg); + } +} + void vfio_user_wait_reqs(VFIOUserProxy *proxy) { VFIOUserMsg *msg; @@ -720,6 +751,59 @@ void vfio_user_wait_reqs(VFIOUserProxy *proxy) qemu_mutex_unlock(&proxy->lock); } =20 +/* + * Reply to an incoming request. + */ +void vfio_user_send_reply(VFIOUserProxy *proxy, VFIOUserHdr *hdr, int size) +{ + + if (size < sizeof(VFIOUserHdr)) { + error_printf("vfio_user_send_reply - size too small\n"); + g_free(hdr); + return; + } + + /* + * convert header to associated reply + */ + hdr->flags =3D VFIO_USER_REPLY; + hdr->size =3D size; + + vfio_user_send_async(proxy, hdr, NULL); +} + +/* + * Send an error reply to an incoming request. + */ +void vfio_user_send_error(VFIOUserProxy *proxy, VFIOUserHdr *hdr, int erro= r) +{ + + /* + * convert header to associated reply + */ + hdr->flags =3D VFIO_USER_REPLY; + hdr->flags |=3D VFIO_USER_ERROR; + hdr->error_reply =3D error; + hdr->size =3D sizeof(*hdr); + + vfio_user_send_async(proxy, hdr, NULL); +} + +/* + * Close FDs erroneously received in an incoming request. + */ +void vfio_user_putfds(VFIOUserMsg *msg) +{ + VFIOUserFDs *fds =3D msg->fds; + int i; + + for (i =3D 0; i < fds->recv_fds; i++) { + close(fds->fds[i]); + } + g_free(fds); + msg->fds =3D NULL; +} + static QLIST_HEAD(, VFIOUserProxy) vfio_user_sockets =3D QLIST_HEAD_INITIALIZER(vfio_user_sockets); =20 --=20 2.43.0