From patchwork Wed May 29 16:23:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Levon X-Patchwork-Id: 13679264 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C56A4C25B7C for ; Wed, 29 May 2024 16:32:52 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sCM7W-00020K-Gg; Wed, 29 May 2024 12:25:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sCM77-0001JU-Gm for qemu-devel@nongnu.org; Wed, 29 May 2024 12:25:23 -0400 Received: from ssh.movementarian.org ([139.162.205.133] helo=movementarian.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sCM74-0006NI-JN for qemu-devel@nongnu.org; Wed, 29 May 2024 12:25:21 -0400 Received: from movement by movementarian.org with local (Exim 4.95) (envelope-from ) id 1sCM6r-006CR5-DS; Wed, 29 May 2024 17:25:05 +0100 From: John Levon To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, jag.raman@oracle.com, thanos.makatos@nutanix.com, John Johnson , Elena Ufimtseva , John Levon Subject: [PATCH 23/26] vfio-user: dma read/write operations Date: Wed, 29 May 2024 17:23:16 +0100 Message-Id: <20240529162319.1476680-24-levon@movementarian.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240529162319.1476680-1-levon@movementarian.org> References: <20240529162319.1476680-1-levon@movementarian.org> MIME-Version: 1.0 Received-SPF: pass client-ip=139.162.205.133; envelope-from=movement@movementarian.org; helo=movementarian.org X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Jagannathan Raman Messages from server to client that perform device DMA. Originally-by: John Johnson Signed-off-by: Elena Ufimtseva Signed-off-by: Jagannathan Raman Signed-off-by: John Levon --- hw/vfio/user-pci.c | 110 ++++++++++++++++++++++++++++++++++++++++ hw/vfio/user-protocol.h | 13 ++++- hw/vfio/user.c | 57 +++++++++++++++++++++ hw/vfio/user.h | 3 ++ 4 files changed, 182 insertions(+), 1 deletion(-) diff --git a/hw/vfio/user-pci.c b/hw/vfio/user-pci.c index 19fbcf77ab..9fb6ae5142 100644 --- a/hw/vfio/user-pci.c +++ b/hw/vfio/user-pci.c @@ -101,6 +101,95 @@ static void vfio_user_msix_teardown(VFIOPCIDevice *vdev) vdev->msix->pba_region = NULL; } +static void vfio_user_dma_read(VFIOPCIDevice *vdev, VFIOUserDMARW *msg) +{ + PCIDevice *pdev = &vdev->pdev; + VFIOUserProxy *proxy = 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 = msg->count + sizeof(VFIOUserDMARW); + res = g_malloc0(size); + memcpy(res, msg, sizeof(*res)); + g_free(msg); + + r = 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 = &vdev->pdev; + VFIOUserProxy *proxy = 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 = pci_dma_write(pdev, msg->offset, &msg->data, msg->count); + + switch (r) { + case MEMTX_OK: + if ((msg->hdr.flags & VFIO_USER_NO_REPLY) == 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. * @@ -108,7 +197,28 @@ static void vfio_user_msix_teardown(VFIOPCIDevice *vdev) */ static void vfio_user_pci_process_req(void *opaque, VFIOUserMsg *msg) { + VFIOPCIDevice *vdev = opaque; + VFIOUserHdr *hdr = msg->hdr; + + /* no incoming PCI requests pass FDs */ + if (msg->fds != NULL) { + vfio_user_send_error(vdev->vbasedev.proxy, hdr, EINVAL); + vfio_user_putfds(msg); + return; + } + 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); + } } /* diff --git a/hw/vfio/user-protocol.h b/hw/vfio/user-protocol.h index 9b569156fa..607e0f4b7f 100644 --- a/hw/vfio/user-protocol.h +++ b/hw/vfio/user-protocol.h @@ -203,7 +203,18 @@ typedef struct { char data[]; } VFIOUserRegionRW; -/*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.c b/hw/vfio/user.c index adecd9a68a..a383922601 100644 --- a/hw/vfio/user.c +++ b/hw/vfio/user.c @@ -383,6 +383,10 @@ static int vfio_user_recv_one(VFIOUserProxy *proxy) *msg->hdr = hdr; data = (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 = g_malloc0(hdr.size); memcpy(buf, &hdr, sizeof(hdr)); data = buf + sizeof(hdr); @@ -792,6 +796,59 @@ void vfio_user_wait_reqs(VFIOUserProxy *proxy) } } +/* + * 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 = VFIO_USER_REPLY; + hdr->size = 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 error) +{ + + /* + * convert header to associated reply + */ + hdr->flags = VFIO_USER_REPLY; + hdr->flags |= VFIO_USER_ERROR; + hdr->error_reply = error; + hdr->size = 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 = msg->fds; + int i; + + for (i = 0; i < fds->recv_fds; i++) { + close(fds->fds[i]); + } + g_free(fds); + msg->fds = NULL; +} + static QLIST_HEAD(, VFIOUserProxy) vfio_user_sockets = QLIST_HEAD_INITIALIZER(vfio_user_sockets); diff --git a/hw/vfio/user.h b/hw/vfio/user.h index fe24a881f2..fa6bc9a9d6 100644 --- a/hw/vfio/user.h +++ b/hw/vfio/user.h @@ -116,5 +116,8 @@ void vfio_user_send_nowait(VFIOUserProxy *proxy, VFIOUserHdr *hdr, VFIOUserFDs *fds, int rsize); void vfio_user_send_wait(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 error); +void vfio_user_putfds(VFIOUserMsg *msg); #endif /* VFIO_USER_H */