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GET /api/1.2/patches/2231977/?format=api
{ "id": 2231977, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2231977/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260501200026.22784-4-oelghoul@linux.ibm.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.2/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": "<20260501200026.22784-4-oelghoul@linux.ibm.com>", "list_archive_url": null, "date": "2026-05-01T20:00:24", "name": "[RFC,v1,3/5] hw/virtio: Add DMA counters for virtio-pci devices", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "86d40b814735272cc1035dc8612d01202bbecd61", "submitter": { "id": 93299, "url": "http://patchwork.ozlabs.org/api/1.2/people/93299/?format=api", "name": "Omar Elghoul", "email": "oelghoul@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260501200026.22784-4-oelghoul@linux.ibm.com/mbox/", "series": [ { "id": 502493, "url": "http://patchwork.ozlabs.org/api/1.2/series/502493/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502493", "date": "2026-05-01T20:00:21", "name": "s390x/pci: Improved zPCI Function Measurement Support", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502493/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2231977/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2231977/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=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=orD4z5+a;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n :content-transfer-encoding:date:from:in-reply-to:message-id\n :mime-version:references:subject:to; s=pp1; bh=IwvvP9MY8WoGYhdgJ\n WzLy3S2sw6QZcbw07ZcxAXwF0I=; b=orD4z5+arMyNKir+beBy1SzHib6xjAfUd\n ABeVKu5cJRWkM0zRjXl7eMkmHc5csg8sHJdglin/DU0CVGI/gD1mzNkS8gfykPQt\n 2rRUY2P5g4EX3FKMM8Hb2x0Zs7VFKC4OJZH7KdRPRjgsvYFe6g40A7K/vU/lP8n+\n MaODRc2wJhZ/zpl+VltwxEs4mtxw0PjU8yR9L4FhaWpwo1wahfLYEEb8ae07bSRZ\n ehpCZBH0XElLBq0Pf/l4RPmM06azyHerbvR8h6CZRtzrYcfmSuKa+7nJWseusQR1\n g3P5z9AMvcN0s1oWzKKVPKcfQTVQCjkI41xHYAUuuGxc0S+yoAPrw==", "From": "Omar Elghoul <oelghoul@linux.ibm.com>", "To": "qemu-devel@nongnu.org, qemu-s390x@nongnu.org", "Cc": "oelghoul@linux.ibm.com, mjrosato@linux.ibm.com, alifm@linux.ibm.com,\n farman@linux.ibm.com, pasic@linux.ibm.com, borntraeger@linux.ibm.com,\n richard.henderson@linaro.org, iii@linux.ibm.com, david@kernel.org,\n cohuck@redhat.com, mst@redhat.com, pbonzini@redhat.com, clg@redhat.com", "Subject": "[RFC PATCH v1 3/5] hw/virtio: Add DMA counters for virtio-pci devices", "Date": "Fri, 1 May 2026 16:00:24 -0400", "Message-ID": "<20260501200026.22784-4-oelghoul@linux.ibm.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260501200026.22784-1-oelghoul@linux.ibm.com>", "References": "<20260501200026.22784-1-oelghoul@linux.ibm.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Authority-Analysis": "v=2.4 cv=CIIamxrD c=1 sm=1 tr=0 ts=69f50715 cx=c_pps\n a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17\n a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=456z7t5ePv1a_L0t-noA:9", "X-Proofpoint-ORIG-GUID": "jUlSoWcWBnFT_KLsUJPayO9F9xhYjKfW", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNTAxMDE5NSBTYWx0ZWRfXyGg/RRSSQxjs\n dBwExYQDxtalSUcB4LnfalVhB/hQLfgnzOMtDiilkdlBNzX1mcHo/U0qjz93uNnuvMs6ngcwUG2\n 9iXaXn3KIXnp9L5qcKQWoDq9GCfmKhXrx9Nv9WekHPvMR4GVdZwLRkThPmdqFYV5q+8LHj7q3wW\n ypBUgabiYGOg/I7gJEvklVRqc1rQeZMraPzs4zrP3S9Ol2uFJAWTGRuW9ZxdoSNCjNWR+jH/CYZ\n lb8GggUBrHvSY1WczqJG4tDiCwbE/Zbm+uS3tOvMyRC4mhqyrOgZ2EDFLtROx3KBCRxoOcugVnM\n eyQvQkR6I1pSVFo8/bu5LIB1Rft83I/rl9bWjh2A5v6ABckO7dyra8BAJgE+Pr5Q1AH4SbOI+T5\n yc7Nal88cuxjXVcZr6bsyUE9+s1UnNjwOi7X/IX/smx7MfwcwD0y4Pw/mksycvkj+iGmTceETRL\n 8LPxB1Lkn+8O7ntQBpw==", "X-Proofpoint-GUID": "jUlSoWcWBnFT_KLsUJPayO9F9xhYjKfW", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-05-01_05,2026-04-30_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n spamscore=0 phishscore=0 malwarescore=0 suspectscore=0 adultscore=0\n impostorscore=0 lowpriorityscore=0 clxscore=1011 bulkscore=0\n priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc=\n route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000\n definitions=main-2605010195", "Received-SPF": "pass client-ip=148.163.158.5;\n envelope-from=oelghoul@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com", "X-Spam_score_int": "-26", "X-Spam_score": "-2.7", "X-Spam_bar": "--", "X-Spam_report": "(-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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": "Internally track DMA read/write byte counters for virtio-pci devices by\nassigning them a DMA owner bus. This will allow an implementation of the\nFMB format-0 for zPCI. The assignment of an owner bus is also done from\ns390x-specific realization such that other architectures do not need to\ninternally track unutilized counters.\n\nSigned-off-by: Omar Elghoul <oelghoul@linux.ibm.com>\n---\n hw/s390x/s390-pci-bus.c | 7 +++++++\n hw/virtio/virtio.c | 16 ++++++++++++++++\n include/hw/pci/pci_device.h | 4 ++++\n include/hw/virtio/virtio.h | 1 +\n 4 files changed, 28 insertions(+)", "diff": "diff --git a/hw/s390x/s390-pci-bus.c b/hw/s390x/s390-pci-bus.c\nindex 128814f4c5..7eee1efeb7 100644\n--- a/hw/s390x/s390-pci-bus.c\n+++ b/hw/s390x/s390-pci-bus.c\n@@ -20,6 +20,7 @@\n #include \"hw/s390x/s390-pci-kvm.h\"\n #include \"hw/s390x/s390-pci-vfio.h\"\n #include \"hw/s390x/s390-virtio-ccw.h\"\n+#include \"hw/virtio/virtio-pci.h\"\n #include \"hw/core/boards.h\"\n #include \"hw/pci/pci_bus.h\"\n #include \"hw/core/qdev-properties.h\"\n@@ -1192,6 +1193,12 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,\n pbdev->rtr_avail = false;\n }\n \n+ if (object_dynamic_cast(OBJECT(dev), TYPE_VIRTIO_PCI)) {\n+ VirtIOPCIProxy *virtio_proxy = VIRTIO_PCI(pbdev->pdev);\n+ VirtIODevice *vdev = virtio_bus_get_device(&virtio_proxy->bus);\n+ vdev->dma_owner = OBJECT(virtio_proxy);\n+ }\n+\n if (s390_pci_msix_init(pbdev) && !pbdev->interp) {\n error_setg(errp, \"MSI-X support is mandatory \"\n \"in the S390 architecture\");\ndiff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c\nindex 8fcf6cfd0b..f61ad57821 100644\n--- a/hw/virtio/virtio.c\n+++ b/hw/virtio/virtio.c\n@@ -24,6 +24,7 @@\n #include \"qom/object_interfaces.h\"\n #include \"hw/core/cpu.h\"\n #include \"hw/virtio/virtio.h\"\n+#include \"hw/virtio/virtio-pci.h\"\n #include \"hw/virtio/vhost.h\"\n #include \"migration/qemu-file-types.h\"\n #include \"qemu/atomic.h\"\n@@ -1617,9 +1618,16 @@ static bool virtqueue_map_desc(VirtIODevice *vdev, unsigned int *p_num_sg,\n hwaddr pa, size_t sz)\n {\n bool ok = false;\n+ PCIDevice *pdev = NULL;\n unsigned num_sg = *p_num_sg;\n assert(num_sg <= max_num_sg);\n \n+ if (vdev->dma_owner &&\n+ object_dynamic_cast(vdev->dma_owner, TYPE_VIRTIO_PCI)) {\n+ VirtIOPCIProxy *proxy = VIRTIO_PCI(vdev->dma_owner);\n+ pdev = &proxy->pci_dev;\n+ }\n+\n if (!sz) {\n virtio_error(vdev, \"virtio: zero sized buffers are not allowed\");\n goto out;\n@@ -1650,6 +1658,14 @@ static bool virtqueue_map_desc(VirtIODevice *vdev, unsigned int *p_num_sg,\n sz -= len;\n pa += len;\n num_sg++;\n+\n+ if (pdev) {\n+ if (is_write) {\n+ pdev->dma_wbytes += len;\n+ } else {\n+ pdev->dma_rbytes += len;\n+ }\n+ }\n }\n ok = true;\n \ndiff --git a/include/hw/pci/pci_device.h b/include/hw/pci/pci_device.h\nindex 5cac6e1688..5a4fd4f605 100644\n--- a/include/hw/pci/pci_device.h\n+++ b/include/hw/pci/pci_device.h\n@@ -98,6 +98,10 @@ struct PCIDevice {\n MemoryRegion bus_master_container_region;\n MemoryRegion bus_master_enable_region;\n \n+ /* DMA statistics */\n+ uint64_t dma_rbytes;\n+ uint64_t dma_wbytes;\n+\n /* do not access the following fields */\n PCIConfigReadFunc *config_read;\n PCIConfigWriteFunc *config_write;\ndiff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h\nindex 6344bd7b68..e9e7e437f9 100644\n--- a/include/hw/virtio/virtio.h\n+++ b/include/hw/virtio/virtio.h\n@@ -161,6 +161,7 @@ struct VirtIODevice\n */\n bool use_guest_notifier_mask;\n AddressSpace *dma_as;\n+ Object *dma_owner;\n QLIST_HEAD(, VirtQueue) *vector_queues;\n QTAILQ_ENTRY(VirtIODevice) next;\n /**\n", "prefixes": [ "RFC", "v1", "3/5" ] }