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GET /api/1.1/patches/2221750/?format=api
{ "id": 2221750, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2221750/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260410085716.877185-2-john.levon@nutanix.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/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": "" }, "msgid": "<20260410085716.877185-2-john.levon@nutanix.com>", "date": "2026-04-10T08:57:14", "name": "[v2,1/3] vfio-user: support VFIO_USER_DEVICE_FEATURE", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c02e5b09bc83817174056c5ac704be7aa4435f98", "submitter": { "id": 80631, "url": "http://patchwork.ozlabs.org/api/1.1/people/80631/?format=api", "name": "John Levon", "email": "john.levon@nutanix.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260410085716.877185-2-john.levon@nutanix.com/mbox/", "series": [ { "id": 499428, "url": "http://patchwork.ozlabs.org/api/1.1/series/499428/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499428", "date": "2026-04-10T08:57:15", "name": "vfio-user fixes", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/499428/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2221750/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2221750/checks/", "tags": {}, "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=nutanix.com header.i=@nutanix.com header.a=rsa-sha256\n header.s=proofpoint20171006 header.b=b4X5DVhT;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=nutanix.com header.i=@nutanix.com header.a=rsa-sha256\n header.s=selector1 header.b=d7Ap2uFJ;\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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helo=mx0a-002c1b01.pphosted.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=-0.54,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_LOW=-0.7, 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": "Plumb through vfio_device_get_feature to the vfio-user server. Note that\nwe translate EINVAL into ENOTTY, as the existing generic vfio code is\nexpecting the latter to mean \"unsupported\".\n\nAs part of adding a trace point, clean up the trace file.\n\nSigned-off-by: John Levon <john.levon@nutanix.com>\n---\n hw/vfio-user/protocol.h | 12 +++++++++++\n hw/vfio-user/device.c | 42 +++++++++++++++++++++++++++++++++++++++\n hw/vfio-user/trace-events | 23 +++++++++++----------\n 3 files changed, 67 insertions(+), 10 deletions(-)", "diff": "diff --git a/hw/vfio-user/protocol.h b/hw/vfio-user/protocol.h\nindex 3249a4a6b6..2a0c31e7c5 100644\n--- a/hw/vfio-user/protocol.h\n+++ b/hw/vfio-user/protocol.h\n@@ -40,6 +40,7 @@ enum vfio_user_command {\n VFIO_USER_DEVICE_RESET = 13,\n VFIO_USER_DIRTY_PAGES = 14,\n VFIO_USER_REGION_WRITE_MULTI = 15,\n+ VFIO_USER_DEVICE_FEATURE = 16,\n VFIO_USER_MAX,\n };\n \n@@ -239,4 +240,15 @@ typedef struct {\n VFIOUserWROne wrs[VFIO_USER_MULTI_MAX];\n } VFIOUserWRMulti;\n \n+/*\n+ * VFIO_USER_DEVICE_FEATURE\n+ * imported from struct vfio_device_feature\n+ */\n+typedef struct {\n+ VFIOUserHdr hdr;\n+ uint32_t argsz;\n+ uint32_t flags;\n+ char data[];\n+} VFIOUserDeviceFeature;\n+\n #endif /* VFIO_USER_PROTOCOL_H */\ndiff --git a/hw/vfio-user/device.c b/hw/vfio-user/device.c\nindex 64ef35b320..b8d2b7c1a8 100644\n--- a/hw/vfio-user/device.c\n+++ b/hw/vfio-user/device.c\n@@ -74,6 +74,47 @@ void vfio_user_device_reset(VFIOUserProxy *proxy)\n }\n }\n \n+static int\n+vfio_user_device_io_device_feature(VFIODevice *vbasedev,\n+ struct vfio_device_feature *feature)\n+{\n+ g_autofree VFIOUserDeviceFeature *msgp = NULL;\n+ int size = sizeof(VFIOUserHdr) + feature->argsz;\n+ VFIOUserProxy *proxy = vbasedev->proxy;\n+ Error *local_err = NULL;\n+\n+ msgp = g_malloc0(size);\n+\n+ vfio_user_request_msg(&msgp->hdr, VFIO_USER_DEVICE_FEATURE, size, 0);\n+\n+ memcpy(&msgp->argsz, &feature->argsz, feature->argsz);\n+\n+ if (!vfio_user_send_wait(proxy, &msgp->hdr, NULL, size, &local_err)) {\n+ error_prepend(&local_err, \"%s: \", __func__);\n+ error_report_err(local_err);\n+ return -EFAULT;\n+ }\n+\n+ if (msgp->hdr.flags & VFIO_USER_ERROR) {\n+ /*\n+ * Client expects ENOTTY for \"not supported\", but the protocol may\n+ * return EINVAL (which should only occur in the case the feature isn't\n+ * actually supported on the server).\n+ */\n+ if (msgp->hdr.error_reply == EINVAL) {\n+ return -ENOTTY;\n+ }\n+\n+ return -msgp->hdr.error_reply;\n+ }\n+\n+ memcpy(feature, &msgp->argsz, feature->argsz);\n+\n+ trace_vfio_user_device_io_device_feature(msgp->argsz, msgp->flags);\n+\n+ return 0;\n+}\n+\n static int vfio_user_get_region_info(VFIOUserProxy *proxy,\n struct vfio_region_info *info,\n VFIOUserFDs *fds)\n@@ -432,6 +473,7 @@ static int vfio_user_device_io_region_write(VFIODevice *vbasedev, uint8_t index,\n * Socket-based io_ops\n */\n VFIODeviceIOOps vfio_user_device_io_ops_sock = {\n+ .device_feature = vfio_user_device_io_device_feature,\n .get_region_info = vfio_user_device_io_get_region_info,\n .get_irq_info = vfio_user_device_io_get_irq_info,\n .set_irqs = vfio_user_device_io_set_irqs,\ndiff --git a/hw/vfio-user/trace-events b/hw/vfio-user/trace-events\nindex abb67f4c11..503e1c82d4 100644\n--- a/hw/vfio-user/trace-events\n+++ b/hw/vfio-user/trace-events\n@@ -2,19 +2,22 @@\n #\n # SPDX-License-Identifier: GPL-2.0-or-later\n \n-# common.c\n+# container.c\n+vfio_user_dma_map(uint64_t iova, uint64_t size, uint64_t off, uint32_t flags, bool async_ops) \" iova 0x%\"PRIx64\" size 0x%\"PRIx64\" off 0x%\"PRIx64\" flags 0x%x async_ops %d\"\n+vfio_user_dma_unmap(uint64_t iova, uint64_t size, uint32_t flags, bool async_ops) \" iova 0x%\"PRIx64\" size 0x%\"PRIx64\" flags 0x%x async_ops %d\"\n+\n+# device.c\n+vfio_user_device_io_device_feature(uint32_t argsz, uint32_t flags) \" argsz 0x%x flags 0x%x\"\n+vfio_user_get_info(uint32_t nregions, uint32_t nirqs) \" #regions %d #irqs %d\"\n+vfio_user_get_irq_info(uint32_t index, uint32_t flags, uint32_t count) \" index %d flags 0x%x count %d\"\n+vfio_user_set_irqs(uint32_t index, uint32_t start, uint32_t count, uint32_t flags) \" index %d start %d count %d flags 0x%x\"\n+vfio_user_get_region_info(uint32_t index, uint32_t flags, uint64_t size) \" index %d flags 0x%x size 0x%\"PRIx64\n+vfio_user_region_rw(uint32_t region, uint64_t off, uint32_t count) \" region %d offset 0x%\"PRIx64\" count %d\"\n+\n+# proxy.c\n vfio_user_recv_hdr(const char *name, uint16_t id, uint16_t cmd, uint32_t size, uint32_t flags) \" (%s) id 0x%x cmd 0x%x size 0x%x flags 0x%x\"\n vfio_user_recv_read(uint16_t id, int read) \" id 0x%x read 0x%x\"\n vfio_user_recv_request(uint16_t cmd) \" command 0x%x\"\n vfio_user_send_write(uint16_t id, int wrote) \" id 0x%x wrote 0x%x\"\n vfio_user_version(uint16_t major, uint16_t minor, const char *caps) \" major %d minor %d caps: %s\"\n-vfio_user_get_info(uint32_t nregions, uint32_t nirqs) \" #regions %d #irqs %d\"\n-vfio_user_get_region_info(uint32_t index, uint32_t flags, uint64_t size) \" index %d flags 0x%x size 0x%\"PRIx64\n-vfio_user_region_rw(uint32_t region, uint64_t off, uint32_t count) \" region %d offset 0x%\"PRIx64\" count %d\"\n-vfio_user_get_irq_info(uint32_t index, uint32_t flags, uint32_t count) \" index %d flags 0x%x count %d\"\n-vfio_user_set_irqs(uint32_t index, uint32_t start, uint32_t count, uint32_t flags) \" index %d start %d count %d flags 0x%x\"\n vfio_user_wrmulti(const char *s, uint64_t wr_cnt) \" %s count 0x%\"PRIx64\n-\n-# container.c\n-vfio_user_dma_map(uint64_t iova, uint64_t size, uint64_t off, uint32_t flags, bool async_ops) \" iova 0x%\"PRIx64\" size 0x%\"PRIx64\" off 0x%\"PRIx64\" flags 0x%x async_ops %d\"\n-vfio_user_dma_unmap(uint64_t iova, uint64_t size, uint32_t flags, bool async_ops) \" iova 0x%\"PRIx64\" size 0x%\"PRIx64\" flags 0x%x async_ops %d\"\n", "prefixes": [ "v2", "1/3" ] }