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{ "id": 2225288, "url": "http://patchwork.ozlabs.org/api/1.2/covers/2225288/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260420193846.675844-1-vsementsov@yandex-team.ru/", "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": "<20260420193846.675844-1-vsementsov@yandex-team.ru>", "list_archive_url": null, "date": "2026-04-20T19:38:37", "name": "[v15,0/8] virtio-net: live-TAP local migration", "submitter": { "id": 84116, "url": "http://patchwork.ozlabs.org/api/1.2/people/84116/?format=api", "name": "Vladimir Sementsov-Ogievskiy", "email": "vsementsov@yandex-team.ru" }, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/cover/20260420193846.675844-1-vsementsov@yandex-team.ru/mbox/", "series": [ { "id": 500670, "url": "http://patchwork.ozlabs.org/api/1.2/series/500670/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500670", "date": "2026-04-20T19:38:40", "name": "virtio-net: live-TAP local migration", "version": 15, "mbox": "http://patchwork.ozlabs.org/series/500670/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2225288/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 (1024-bit key;\n unprotected) header.d=yandex-team.ru header.i=@yandex-team.ru\n header.a=rsa-sha256 header.s=default header.b=n7958LU8;\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=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)", "mail-nwsmtp-smtp-corp-main-68.klg.yp-c.yandex.net;\n dkim=pass header.i=@yandex-team.ru" ], "Received": [ "from lists1p.gnu.org (lists1p.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 4fzwn53yMqz1yCv\n\tfor <incoming@patchwork.ozlabs.org>; Tue, 21 Apr 2026 05:40:09 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wEuSV-0007Zz-90; Mon, 20 Apr 2026 15:39:03 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <vsementsov@yandex-team.ru>)\n id 1wEuSS-0007ZH-RT\n for qemu-devel@nongnu.org; Mon, 20 Apr 2026 15:39:00 -0400", "from forwardcorp1d.mail.yandex.net\n ([2a02:6b8:c41:1300:1:45:d181:df01])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <vsementsov@yandex-team.ru>)\n id 1wEuSQ-0004SH-EI\n for qemu-devel@nongnu.org; Mon, 20 Apr 2026 15:39:00 -0400", "from mail-nwsmtp-smtp-corp-main-68.klg.yp-c.yandex.net\n (mail-nwsmtp-smtp-corp-main-68.klg.yp-c.yandex.net\n [IPv6:2a02:6b8:c42:94a9:0:640:a3fa:0])\n by forwardcorp1d.mail.yandex.net (Yandex) with ESMTPS id 47DF380622;\n Mon, 20 Apr 2026 22:38:52 +0300 (MSK)", "from vsementsov-lin (unknown [2a02:6bf:8080:54b::1:34])\n by mail-nwsmtp-smtp-corp-main-68.klg.yp-c.yandex.net (smtpcorp) with ESMTPSA\n id mcXJF10KxSw0-KhG92qiW; Mon, 20 Apr 2026 22:38:51 +0300" ], "Precedence": "bulk", "X-Yandex-Fwd": "1", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru;\n s=default; t=1776713931;\n bh=BVW7W5ay8Vt0Om158SrtuuKZqKxY4jrfYD4TteEGYfw=;\n h=Message-ID:Date:Cc:Subject:To:From;\n b=n7958LU8Tp7TUnPrUpEghX9PLODqdzPTdHJV97lbKyk6ftWO1D9ey3vGGWHFuJU7j\n 9M9b21O1Kt/hS6lcCjHr9TjeRHSLlUQNymktPtLoAF6lSv3Z3L35h84zC1yY1KGS/h\n Pr/CIRpF5q64dt/GUssB+5hsBkVB2rdsbYS3Gwfo=", "From": "Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>", "To": "jasowang@redhat.com,\n\tmst@redhat.com", "Cc": "armbru@redhat.com, peterx@redhat.com, farosas@suse.de,\n raphael.s.norwitz@gmail.com, bchaney@akamai.com, vsementsov@yandex-team.ru,\n qemu-devel@nongnu.org, berrange@redhat.com, pbonzini@redhat.com,\n yc-core@yandex-team.ru", "Subject": "[PATCH v15 0/8] virtio-net: live-TAP local migration", "Date": "Mon, 20 Apr 2026 22:38:37 +0300", "Message-ID": "<20260420193846.675844-1-vsementsov@yandex-team.ru>", "X-Mailer": "git-send-email 2.52.0", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=2a02:6b8:c41:1300:1:45:d181:df01;\n envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1d.mail.yandex.net", "X-Spam_score_int": "-20", "X-Spam_score": "-2.1", "X-Spam_bar": "--", "X-Spam_report": "(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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", "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 all!\n\nHere is a new migration parameter \"local\", which allows to\nenable local migration of TAP virtio-net backend (and maybe other\ndevices and backends in future), including its properties and open\nfds.\n\nWith this new option, management software doesn't need to initialize\nnew TAP and do a switch to it. Nothing should be done around\nvirtio-net in local migration: it just migrates and continues to use\nsame TAP device. So we avoid extra logic in management software, extra\nallocations in kernel (for new TAP), and corresponding extra delay in\nmigration downtime.\n\nv15:\n03: add a-b by Peter\n05: rebase on master, fix compat property to be part of 11.0\n\nv15 pushed as branch up-tap-fd-migration-with-bk-opt\n at https://gitlab.com/vsementsov/qemu.git\n\nBased-on: <20260318113144.15697-1-vsementsov@yandex-team.ru>\n \"[PATCH v4 00/13] net: refactoring and fixes\"\n\nVladimir Sementsov-Ogievskiy (8):\n net/tap: move vhost-net open() calls to tap_parse_vhost_fds()\n net/tap: move vhost initialization to tap_setup_vhost()\n qapi: add local migration parameter\n net: introduce vmstate_net_peer_backend\n virtio-net: support local migration of backend\n net/tap: support local migration with virtio-net\n tests/functional: add skipWithoutSudo() decorator\n tests/functional: add test_tap_migration\n\n hw/core/machine.c | 5 +\n hw/i386/pc_q35.c | 1 +\n hw/net/virtio-net.c | 137 +++++-\n include/hw/core/boards.h | 3 +\n include/hw/virtio/virtio-net.h | 2 +\n include/migration/misc.h | 2 +\n include/net/net.h | 6 +\n migration/options.c | 18 +-\n net/net.c | 47 ++\n net/tap.c | 246 ++++++++--\n qapi/migration.json | 12 +-\n qapi/net.json | 10 +-\n tests/functional/qemu_test/decorators.py | 16 +\n tests/functional/x86_64/meson.build | 1 +\n tests/functional/x86_64/test_tap_migration.py | 456 ++++++++++++++++++\n 15 files changed, 911 insertions(+), 51 deletions(-)\n create mode 100755 tests/functional/x86_64/test_tap_migration.py" }