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{ "id": 2231974, "url": "http://patchwork.ozlabs.org/api/1.2/covers/2231974/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260501200026.22784-1-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": "<20260501200026.22784-1-oelghoul@linux.ibm.com>", "list_archive_url": null, "date": "2026-05-01T20:00:21", "name": "[RFC,v1,0/5] s390x/pci: Improved zPCI Function Measurement Support", "submitter": { "id": 93299, "url": "http://patchwork.ozlabs.org/api/1.2/people/93299/?format=api", "name": "Omar Elghoul", "email": "oelghoul@linux.ibm.com" }, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260501200026.22784-1-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/covers/2231974/comments/", "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=hIGvpFyW;\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:message-id:mime-version\n :subject:to; s=pp1; bh=E9ACmYlh9wDL1q7lQSckiLztF3rCg94xW/oVgs4NK\n kE=; b=hIGvpFyW3u2VzOUceHztZ6KYu8+TUjRgCjYEDI5VJfVfYrhivckqEsXqj\n howUl8NMuad+kBEkW0NOlDTDNdTvZgP8IcTSLKlKd47UNic8boQOQtzmyggyKsMx\n dbC+V5AGFC+CifWByZhBi60rnnn2OA8WcFfB5PWWwmmQaeJKYFmWoal8qTts84PQ\n DBmPnTPWj1lskVtsYkWBSloqksBpRovpk/KLXfZHI+Qu3j4vYt9T8plIYu5zJG2/\n C64viPPVnS5l0B86zpVKPiz8/n+vdOOyOHza6hOAAar4hPidh0xWh4Q55bVSMURD\n 5Dtnfor+8CPoW4PEUkQoSsunbIJ6A==", "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 0/5] s390x/pci: Improved zPCI Function Measurement\n Support", "Date": "Fri, 1 May 2026 16:00:21 -0400", "Message-ID": "<20260501200026.22784-1-oelghoul@linux.ibm.com>", "X-Mailer": "git-send-email 2.52.0", "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=69f506b7 cx=c_pps\n a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17\n a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=RzCfie-kr_QcCd8fBx8p:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8\n a=vVyIiItxORhcaOXRTgwA:9", "X-Proofpoint-ORIG-GUID": "dWyJgb2k8I8DwZENENMGtbVPUQD5Z6vn", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNTAxMDE5NSBTYWx0ZWRfX65lB2KxVa1rZ\n zC1Mh8MUM/hMDhJ4xr+q60uizbOWJUsMbLNJsglS1IdwpaAiJQFWJnlsaCNScAGDrPPcj/3HNNe\n pLE6Oj7NO6yhGLsAg+RcMxjA/hXkYzv2YSwNeFmfRdgvR5yUD3B775s6LDrXwXPEDDGrGfg28KM\n ILBg3/u5uFUSsl1NZwJib76MZLc33buMq8ItvQzBUBUMjqcUh2yTYbBg/2TZjHYk9zSqR0mYJij\n 5Yeg4ArxPxhx8THH9ya0Efh7W7b+meV85/pGp3oRj9Fv0tabAspW0fJJ/6olu84NNPb171tnQoy\n JNvGaGji/a5Jjt9+jJGNlBg7FK4U+yxhzG/9Hu9ODoWjT+Lwx7kF+f1ygTBsx08ursywPybYpPx\n QY8r8hJGQFeJDS4QQy3O4dYZ3iwJn6J8hPBGWcKNYf40eTg59BDBWx3UNwlDXlBxi4MHydKsDJH\n PBrKxj1rRdAcDIV4rXQ==", "X-Proofpoint-GUID": "dWyJgb2k8I8DwZENENMGtbVPUQD5Z6vn", "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": "Hi,\n\nThis patch series improves support for function measurement on s390x for\nzPCI passthrough devices. It is dependent on the eponymous kernel patch\nseries linked below. [1]\n\nMotivation\n==========\nThe firmware on s390x machines allows for tracking a variety of statistics\nrelating to zPCI devices in a function measurement block (FMB). At the time\nof writing, the kernel does not provide QEMU with a structured mechanism to\nfetch the FMB of passthrough devices. QEMU also does not report the PFT to\nthe guest, which can cause issues with tools such as smc-rnics that depend\non the PFT to detect ISM and RoCE devices. Furthermore, the FMB itself can\ntake on different formats depending on the PFT, while QEMU's implementation\nis limited to only the generic section that prefixes the format-specific\nstructures.\n\nProposal\n========\nThe aforementioned kernel series proposes a VFIO feature that allows QEMU\nto read the latest snapshot of the FMB. In this patch series, we propose\nusing that mechanism to share the FMB with the guest, as seen from the\nhost. We also inform the guest of the PFT and the FMB length as detected\nfrom the host's CLP. Furthermore, we implement the format-0 FMB (DMA\ncounters) for virtio-pci devices.\n\nI'd appreciate any comments on this approach.\n\nThanks in advance.\n\n[1] https://lore.kernel.org/all/20260501192530.9429-1-oelghoul@linux.ibm.com/\n\nOmar Elghoul (5):\n [do-not-merge] linux-headers: Add definitions for VFIO zPCI FMB\n passthrough\n hw/s390x: Clarified FMB format for emulated and passthrough devices\n hw/virtio: Add DMA counters for virtio-pci devices\n hw/s390x: Internal support for FMB passthrough\n hw/s390x: Report FMB passthrough and/or FMB DMA counters to the guest\n\n hw/s390x/s390-pci-bus.c | 17 +++-\n hw/s390x/s390-pci-inst.c | 65 ++++++++++++++-\n hw/s390x/s390-pci-vfio-stubs.c | 16 ++++\n hw/s390x/s390-pci-vfio.c | 133 ++++++++++++++++++++++++++-----\n hw/virtio/virtio.c | 16 ++++\n include/hw/pci/pci_device.h | 4 +\n include/hw/s390x/s390-pci-bus.h | 29 ++++++-\n include/hw/s390x/s390-pci-vfio.h | 4 +\n include/hw/virtio/virtio.h | 1 +\n linux-headers/linux/vfio.h | 43 ++++++++++\n 10 files changed, 301 insertions(+), 27 deletions(-)" }