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GET /api/patches/2194893/?format=api
{ "id": 2194893, "url": "http://patchwork.ozlabs.org/api/patches/2194893/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260210070155.1176081-12-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": "<20260210070155.1176081-12-vivek.kasireddy@intel.com>", "list_archive_url": null, "date": "2026-02-10T06:59:51", "name": "[v6,11/11] virtio-gpu-dmabuf: Create dmabuf for blobs associated with VFIO devices", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7b0a18b5da1cdd16cbfb542f20f1073b2ba8794d", "submitter": { "id": 81116, "url": "http://patchwork.ozlabs.org/api/people/81116/?format=api", "name": "Kasireddy, Vivek", "email": "vivek.kasireddy@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260210070155.1176081-12-vivek.kasireddy@intel.com/mbox/", "series": [ { "id": 491614, "url": "http://patchwork.ozlabs.org/api/series/491614/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=491614", "date": "2026-02-10T06:59:41", "name": "vfio: Create dmabuf from multiple VFIO ranges and use it in virtio-gpu", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/491614/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2194893/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2194893/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=ERJFw2TO;\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 4f9CF95G9kz1xvb\n\tfor <incoming@patchwork.ozlabs.org>; Tue, 10 Feb 2026 18:02:53 +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 1vphli-0005A9-43; Tue, 10 Feb 2026 02:02:42 -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 1vphlf-00057m-JW\n for qemu-devel@nongnu.org; Tue, 10 Feb 2026 02:02:39 -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 1vphld-0004oR-LL\n for qemu-devel@nongnu.org; Tue, 10 Feb 2026 02:02:39 -0500", "from orviesa006.jf.intel.com ([10.64.159.146])\n by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n 09 Feb 2026 23:02:15 -0800", "from vkasired-desk2.fm.intel.com ([10.105.128.132])\n by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384;\n 09 Feb 2026 23:02:14 -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=1770706957; x=1802242957;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=RDJw7SL5tnzcRtJqDrZV2wCnXuhljoWjheVY1G/e+fw=;\n b=ERJFw2TOoNsuMx6i0xlnAKufv9M4ytf32Tc3fQjMqxkwtWAUW6CCCL01\n /H4uUS52mnGBwcteI7oQgLzC1CPKqD/9MZXDMEZ0NDxcMriABy/eHcW91\n N81hwBi2uLnW1rMgx3WU6ePwLsVthlZadeUtqhXM5DrJAAPfySLGhDLFt\n tZIvbnRriEA9xoj6WojtP3c+tkZfhWVj1HE6wPujzd+LNqE1osGsYjYiC\n jtUYQiqU81NpcOeTzqBYn2Ms5TbMAn6bue2fv91DrwPtdYv63DRRHUbGH\n 5dWvME6ZRI3SpWvINlXG2C55NnRYUNe8GAmctPETR8Cc4o04XYXnQJAX/ A==;", "X-CSE-ConnectionGUID": [ "i9sFoLA/TLqZtpkRK7FQ7g==", "KY9oa0X/TdKL1TbsuCEfnw==" ], "X-CSE-MsgGUID": [ "xdp4N3j5RJWPm5dk36krzw==", "apD5OCfZTHqSHZZUt39teg==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6800,10657,11696\"; a=\"72012188\"", "E=Sophos;i=\"6.21,283,1763452800\"; d=\"scan'208\";a=\"72012188\"", "E=Sophos;i=\"6.21,283,1763452800\"; d=\"scan'208\";a=\"210920562\"" ], "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 v6 11/11] virtio-gpu-dmabuf: Create dmabuf for blobs\n associated with VFIO devices", "Date": "Mon, 9 Feb 2026 22:59:51 -0800", "Message-ID": "<20260210070155.1176081-12-vivek.kasireddy@intel.com>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260210070155.1176081-1-vivek.kasireddy@intel.com>", "References": "<20260210070155.1176081-1-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": "-43", "X-Spam_score": "-4.4", "X-Spam_bar": "----", "X-Spam_report": "(-4.4 / 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_RPBL_BLOCKED=0.001,\n RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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() API which identifies the right VFIO\ndevice 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/Kconfig | 5 ++++\n hw/display/virtio-gpu-dmabuf.c | 50 ++++++++++++++++++++++++++++------\n 2 files changed, 47 insertions(+), 8 deletions(-)", "diff": "diff --git a/hw/display/Kconfig b/hw/display/Kconfig\nindex 1e95ab28ef..0d090f25f5 100644\n--- a/hw/display/Kconfig\n+++ b/hw/display/Kconfig\n@@ -106,6 +106,11 @@ config VIRTIO_VGA\n depends on VIRTIO_PCI\n select VGA\n \n+config VIRTIO_GPU_VFIO_BLOB\n+ bool\n+ default y\n+ depends on VFIO\n+\n config VHOST_USER_GPU\n bool\n default y\ndiff --git a/hw/display/virtio-gpu-dmabuf.c b/hw/display/virtio-gpu-dmabuf.c\nindex d9b2ecaf31..54d010b995 100644\n--- a/hw/display/virtio-gpu-dmabuf.c\n+++ b/hw/display/virtio-gpu-dmabuf.c\n@@ -18,6 +18,7 @@\n #include \"ui/console.h\"\n #include \"hw/virtio/virtio-gpu.h\"\n #include \"hw/virtio/virtio-gpu-pixman.h\"\n+#include \"hw/vfio/vfio-device.h\"\n #include \"trace.h\"\n #include \"system/ramblock.h\"\n #include \"system/hostmem.h\"\n@@ -27,6 +28,27 @@\n #include \"standard-headers/linux/udmabuf.h\"\n #include \"standard-headers/drm/drm_fourcc.h\"\n \n+static bool virtio_gpu_create_vfio_dmabuf(struct virtio_gpu_simple_resource *r,\n+ Error **errp)\n+{\n+ bool ret = false;\n+#if defined(CONFIG_VIRTIO_GPU_VFIO_BLOB)\n+ Error *local_err = NULL;\n+ int fd;\n+\n+ if (!vfio_device_create_dmabuf(r->iov, r->iov_cnt, &fd, &local_err)) {\n+ error_report_err(*errp);\n+ *errp = NULL;\n+ error_propagate(errp, local_err);\n+ return false;\n+ }\n+\n+ ret = true;\n+ r->dmabuf_fd = fd;\n+#endif\n+ return ret;\n+}\n+\n static bool virtio_gpu_create_udmabuf(struct virtio_gpu_simple_resource *res,\n Error **errp)\n {\n@@ -73,16 +95,28 @@ static bool 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 *local_err = NULL;\n+ bool ret = true;\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- res->remapped = NULL;\n- return false;\n+ map = NULL;\n+ ret = false;\n+#if defined(CONFIG_VIRTIO_GPU_VFIO_BLOB)\n+ if (vfio_device_mmap_dmabuf(res->iov, res->iov_cnt, &map,\n+ res->blob_size, &local_err)) {\n+ ret = true;\n+ } else {\n+ error_report_err(*errp);\n+ *errp = NULL;\n+ }\n+#endif\n+ error_propagate(errp, local_err);\n }\n res->remapped = map;\n- return true;\n+ return ret;\n }\n \n static void virtio_gpu_destroy_dmabuf(struct virtio_gpu_simple_resource *res)\n@@ -145,8 +179,10 @@ void virtio_gpu_init_dmabuf(struct virtio_gpu_simple_resource *res)\n pdata = res->iov[0].iov_base;\n } else {\n if (!virtio_gpu_create_udmabuf(res, &local_err)) {\n- if (local_err) {\n- error_report_err(local_err);\n+ if (!virtio_gpu_create_vfio_dmabuf(res, &local_err)) {\n+ if (local_err) {\n+ error_report_err(local_err);\n+ }\n }\n return;\n }\n@@ -163,9 +199,7 @@ void virtio_gpu_init_dmabuf(struct virtio_gpu_simple_resource *res)\n \n void virtio_gpu_fini_dmabuf(struct virtio_gpu_simple_resource *res)\n {\n- if (res->remapped) {\n- virtio_gpu_destroy_dmabuf(res);\n- }\n+ virtio_gpu_destroy_dmabuf(res);\n }\n \n static void virtio_gpu_free_dmabuf(VirtIOGPU *g, VGPUDMABuf *dmabuf)\n", "prefixes": [ "v6", "11/11" ] }