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GET /api/patches/2202626/?format=api
{ "id": 2202626, "url": "http://patchwork.ozlabs.org/api/patches/2202626/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260227221632.827046-11-vivek.kasireddy@intel.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260227221632.827046-11-vivek.kasireddy@intel.com>", "list_archive_url": null, "date": "2026-02-27T22:13:56", "name": "[v8,10/10] virtio-gpu-dmabuf: Create dmabuf for blobs associated with VFIO devices", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "b3c64a8a15cfea6b721868d42030b1cb00c62855", "submitter": { "id": 81116, "url": "http://patchwork.ozlabs.org/api/people/81116/?format=api", "name": "Vivek Kasireddy", "email": "vivek.kasireddy@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260227221632.827046-11-vivek.kasireddy@intel.com/mbox/", "series": [ { "id": 493824, "url": "http://patchwork.ozlabs.org/api/series/493824/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=493824", "date": "2026-02-27T22:13:46", "name": "vfio: Create dmabuf from multiple VFIO ranges and use it in virtio-gpu", "version": 8, "mbox": "http://patchwork.ozlabs.org/series/493824/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2202626/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2202626/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=i2YfuSvb;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists.gnu.org (lists.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fN2p75W7Nz1xxx\n\tfor <incoming@patchwork.ozlabs.org>; Sat, 28 Feb 2026 09:20:31 +1100 (AEDT)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1vw6Bu-0006Kk-Jm; Fri, 27 Feb 2026 17:20:11 -0500", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <vivek.kasireddy@intel.com>)\n id 1vw6Bs-0006Jp-2F\n for qemu-devel@nongnu.org; Fri, 27 Feb 2026 17:20:08 -0500", "from mgamail.intel.com ([198.175.65.16])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <vivek.kasireddy@intel.com>)\n id 1vw6Bp-0007ml-Qu\n for qemu-devel@nongnu.org; Fri, 27 Feb 2026 17:20:07 -0500", "from fmviesa003.fm.intel.com ([10.60.135.143])\n by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n 27 Feb 2026 14:19:41 -0800", "from vkasired-desk2.fm.intel.com ([10.105.128.132])\n by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n 27 Feb 2026 14:19:40 -0800" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple;\n d=intel.com; i=@intel.com; q=dns/txt; s=Intel;\n t=1772230806; x=1803766806;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=vEc4G49rjF034O9S3kVdRpVeSAKAdnxFYmbWIJROkr0=;\n b=i2YfuSvb9o7fZuajRMW8hjkppoTZTzwXKztZXDLCk4LKVmxo6oL1SGdj\n 3GvgXXC1gDRfGaIZtSLnFau233AwRshIXWLJm3A3dspcPP2qBzuXdQnj7\n /wdkbkJjth3DLIiEz6izjoOVP39Hf+q/cTkeDGZv7fq/AMcJXSHJpV0UT\n HFSBt7BxOCBgn1Ql1O2ZkJKrkxWUULa01Qp6ZOgsMs0hFKnD21/GSywlr\n /Q0Z5zn5gn/vIxG4zNvqYNuL5GKcrNVrAPY2pDQ3y5Pc6NnGv4eSfk6LK\n grX81Mhzmo/12xpdSnyE34MHKm+v7X5hbIbHsryHQGbEhpgiOoBW3dWaG Q==;", "X-CSE-ConnectionGUID": [ "b6H6vepSSBOpdo9qxq6oSQ==", "DJQDI38kTI+Pb01bV93Bdw==" ], "X-CSE-MsgGUID": [ "E78l4Cd1QMSzrnWzAPpGYg==", "PQaJmZo1SXKWXjn8N7hgyw==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6800,10657,11714\"; a=\"73509370\"", "E=Sophos;i=\"6.21,314,1763452800\"; d=\"scan'208\";a=\"73509370\"" ], "X-ExtLoop1": "1", "From": "Vivek Kasireddy <vivek.kasireddy@intel.com>", "To": "qemu-devel@nongnu.org", "Cc": "Vivek Kasireddy <vivek.kasireddy@intel.com>, =?utf-8?q?Marc-Andr=C3=A9_L?=\n\t=?utf-8?q?ureau?= <marcandre.lureau@redhat.com>,\n =?utf-8?q?Alex_Benn=C3=A9e?= <alex.bennee@linaro.org>,\n Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>,\n Dmitry Osipenko <dmitry.osipenko@collabora.com>,\n Alex Williamson <alex@shazbot.org>,\n =?utf-8?q?C=C3=A9dric_Le_Goater?= <clg@redhat.com>", "Subject": "[PATCH v8 10/10] virtio-gpu-dmabuf: Create dmabuf for blobs\n associated with VFIO devices", "Date": "Fri, 27 Feb 2026 14:13:56 -0800", "Message-ID": "<20260227221632.827046-11-vivek.kasireddy@intel.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260227221632.827046-1-vivek.kasireddy@intel.com>", "References": "<20260227221632.827046-1-vivek.kasireddy@intel.com>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=198.175.65.16;\n envelope-from=vivek.kasireddy@intel.com; helo=mgamail.intel.com", "X-Spam_score_int": "-32", "X-Spam_score": "-3.3", "X-Spam_bar": "---", "X-Spam_report": "(-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.706,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.401, SPF_HELO_NONE=0.001,\n 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": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "In addition to memfd, a blob resource can also have its backing\nstorage in a VFIO device region. Since, there is no effective way\nto determine where the backing storage is located, we first try to\ncreate a dmabuf assuming it is in memfd. If that fails, we try to\ncreate a dmabuf assuming it is in VFIO device region.\n\nSo, we first call virtio_gpu_create_udmabuf() to check if the blob's\nbacking storage is located in a memfd or not. If it is not, we invoke\nthe vfio_device_create_dmabuf_fd() API which identifies the right\nVFIO device and eventually creates a dmabuf fd.\n\nNote that in virtio_gpu_remap_dmabuf(), we first try to test if\nthe VFIO dmabuf exporter supports mmap or not. If it doesn't, we\nfall back to the vfio_device_mmap_dmabuf() API to get a mapping\ncreated for the dmabuf.\n\nCc: Marc-André Lureau <marcandre.lureau@redhat.com>\nCc: Alex Bennée <alex.bennee@linaro.org>\nCc: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>\nCc: Dmitry Osipenko <dmitry.osipenko@collabora.com>\nCc: Alex Williamson <alex@shazbot.org>\nCc: Cédric Le Goater <clg@redhat.com>\nSigned-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>\n---\n hw/display/virtio-gpu-dmabuf.c | 35 +++++++++++++++++++++++++++-------\n 1 file changed, 28 insertions(+), 7 deletions(-)", "diff": "diff --git a/hw/display/virtio-gpu-dmabuf.c b/hw/display/virtio-gpu-dmabuf.c\nindex b2badfc1bd..533d3d601c 100644\n--- a/hw/display/virtio-gpu-dmabuf.c\n+++ b/hw/display/virtio-gpu-dmabuf.c\n@@ -74,13 +74,21 @@ static int virtio_gpu_create_udmabuf(struct virtio_gpu_simple_resource *res,\n static bool virtio_gpu_remap_dmabuf(struct virtio_gpu_simple_resource *res,\n Error **errp)\n {\n+ Error *mmap_err = NULL;\n void *map;\n \n map = mmap(NULL, res->blob_size, PROT_READ, MAP_SHARED, res->dmabuf_fd, 0);\n if (map == MAP_FAILED) {\n- error_setg_errno(errp, errno, \"dmabuf mmap failed\");\n+ error_setg_errno(&mmap_err, errno, \"dmabuf mmap failed: \");\n res->remapped = NULL;\n- return false;\n+\n+ if (!vfio_device_mmap_dmabuf(res->iov, res->iov_cnt, &map,\n+ res->blob_size, errp)) {\n+ error_report_err(mmap_err);\n+ return false;\n+ }\n+ error_free(mmap_err);\n+ mmap_err = NULL;\n }\n res->remapped = map;\n return true;\n@@ -137,7 +145,7 @@ bool virtio_gpu_have_udmabuf(void)\n \n void virtio_gpu_init_dmabuf(struct virtio_gpu_simple_resource *res)\n {\n- Error *local_err = NULL;\n+ Error *local_err = NULL, *vfio_err = NULL;\n void *pdata = NULL;\n int ret;\n \n@@ -151,15 +159,28 @@ void virtio_gpu_init_dmabuf(struct virtio_gpu_simple_resource *res)\n error_prepend(&local_err, \"Cannot create dmabuf: \");\n \n if (ret == VFIO_DMABUF_CREATE_GUEST_ERROR) {\n- qemu_log_mask(LOG_GUEST_ERROR,\n- \"Cannot create dmabuf: incompatible memory\\n\");\n- error_free(local_err);\n- return;\n+ ret = vfio_device_create_dmabuf_fd(res->iov, res->iov_cnt,\n+ &vfio_err);\n+ if (ret > 0) {\n+ error_free(local_err);\n+ local_err = NULL;\n+ goto out;\n+ }\n+\n+ if (ret == VFIO_DMABUF_CREATE_GUEST_ERROR) {\n+ qemu_log_mask(LOG_GUEST_ERROR,\n+ \"Cannot create dmabuf: incompatible memory\\n\");\n+ error_free(vfio_err);\n+ error_free(local_err);\n+ return;\n+ }\n+ error_report_err(vfio_err);\n }\n error_report_err(local_err);\n return;\n }\n \n+out:\n res->dmabuf_fd = ret;\n if (!virtio_gpu_remap_dmabuf(res, &local_err)) {\n error_report_err(local_err);\n", "prefixes": [ "v8", "10/10" ] }