From nobody Fri Nov 14 21:05:49 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=yandex-team.ru ARC-Seal: i=1; a=rsa-sha256; t=1760615510; cv=none; d=zohomail.com; s=zohoarc; b=UO7sRYCOqlq0aL2o9WvJjY6bYuvAe1Spe02EKV8dqr5TRHe5DwM7cdp+DPWYgL0RdiIyt/Idh1LCSHQPi38rBkC0DIeVmt6PXKmfaNzjz3aEXItg4Mb+lanqRSdOaodfOEXtev1Q02YWLzNUeucZnDmNZjlJSxb/shRzaWEwt3U= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1760615510; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=ATBOk7y2BkgORhsGkD3qM3CJxtTyEmK5hDTvCDCS0bI=; b=lqB4ikeE18zV8oG5kpXSAO/kveLiECEuUk9LaOjcleLKY5WoXQUZOamKEiZDTqsx8WEHEsKMTG8gu+ck/+mg4H24XXpdSCPioIX6vnAoGMzwnqAht3f4wZ9wjZSPyKh5VeuwQo0UzXwxQ0YAytNppelxmbGpLi8Ex9YgNkpmTQk= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 17606155106985.1615512256120155; Thu, 16 Oct 2025 04:51:50 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1v9MNZ-0007Qp-AT; Thu, 16 Oct 2025 07:42:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1v9MMt-00078y-6q; Thu, 16 Oct 2025 07:42:03 -0400 Received: from forwardcorp1a.mail.yandex.net ([2a02:6b8:c0e:500:1:45:d181:df01]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1v9MMi-0003Vg-4r; Thu, 16 Oct 2025 07:42:01 -0400 Received: from mail-nwsmtp-smtp-corp-main-69.vla.yp-c.yandex.net (mail-nwsmtp-smtp-corp-main-69.vla.yp-c.yandex.net [IPv6:2a02:6b8:c1f:3a87:0:640:845c:0]) by forwardcorp1a.mail.yandex.net (Yandex) with ESMTPS id 178FBC01D9; Thu, 16 Oct 2025 14:41:35 +0300 (MSK) Received: from vsementsov-lin.. (unknown [2a02:6bf:8080:a8c::1:19]) by mail-nwsmtp-smtp-corp-main-69.vla.yp-c.yandex.net (smtpcorp/Yandex) with ESMTPSA id LfP2M73FEmI0-8SW4HDUx; Thu, 16 Oct 2025 14:41:34 +0300 Precedence: bulk X-Yandex-Fwd: 1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1760614894; bh=ATBOk7y2BkgORhsGkD3qM3CJxtTyEmK5hDTvCDCS0bI=; h=Message-ID:Date:In-Reply-To:Cc:Subject:References:To:From; b=DK2q2cFa+YysBJZ7APancKjLfoPdtnagj6nH30xp4wTDn4U07tbKBm57dk1Qk3R7Z qCcjZNhy/CYtrrAAawGohBAcECSEJ1J9X1GrigwLlBGerNwlJ+xdC94hc6Nu1mwGFi 78Oi1lyUx157LRTtBeJ6mVv1GlNJ736m3eMiu2Sw= Authentication-Results: mail-nwsmtp-smtp-corp-main-69.vla.yp-c.yandex.net; dkim=pass header.i=@yandex-team.ru From: Vladimir Sementsov-Ogievskiy To: raphael@enfabrica.net, pbonzini@redhat.com, farosas@suse.de Cc: mst@redhat.com, sgarzare@redhat.com, marcandre.lureau@redhat.com, kwolf@redhat.com, hreitz@redhat.com, berrange@redhat.com, eblake@redhat.com, armbru@redhat.com, qemu-devel@nongnu.org, qemu-block@nongnu.org, steven.sistare@oracle.com, vsementsov@yandex-team.ru, yc-core@yandex-team.ru, d-tatianin@yandex-team.ru, jasowang@redhat.com, Peter Xu Subject: [PATCH v2 15/25] migration: introduce vmstate_event_notifier Date: Thu, 16 Oct 2025 14:40:52 +0300 Message-ID: <20251016114104.1384675-16-vsementsov@yandex-team.ru> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251016114104.1384675-1-vsementsov@yandex-team.ru> References: <20251016114104.1384675-1-vsementsov@yandex-team.ru> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a02:6b8:c0e:500:1:45:d181:df01; envelope-from=vsementsov@yandex-team.ru; helo=forwardcorp1a.mail.yandex.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, T_SPF_TEMPERROR=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @yandex-team.ru) X-ZM-MESSAGEID: 1760615512850154100 Content-Type: text/plain; charset="utf-8" This will be used to support backend-transfer migration for vhost-user-blk, we'll migrate event notifier fds through migration stream, to avoid extra contact with backend. Signed-off-by: Vladimir Sementsov-Ogievskiy Acked-by: Peter Xu --- include/migration/vmstate.h | 7 ++++ migration/meson.build | 1 + migration/vmstate-event-notifier.c | 54 ++++++++++++++++++++++++++++++ 3 files changed, 62 insertions(+) create mode 100644 migration/vmstate-event-notifier.c diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h index f243518fb5..7f1f1c166a 100644 --- a/include/migration/vmstate.h +++ b/include/migration/vmstate.h @@ -1294,4 +1294,11 @@ void vmstate_register_ram_global(struct MemoryRegion= *memory); =20 bool vmstate_check_only_migratable(const VMStateDescription *vmsd); =20 +extern const VMStateDescription vmstate_event_notifier; + +#define VMSTATE_EVENT_NOTIFIER(_field, _struct) \ + VMSTATE_STRUCT(_field, _struct, 0, vmstate_event_notifier, \ + EventNotifier) + + #endif diff --git a/migration/meson.build b/migration/meson.build index 16909d54c5..b5341ae0cb 100644 --- a/migration/meson.build +++ b/migration/meson.build @@ -5,6 +5,7 @@ migration_files =3D files( 'xbzrle.c', 'vmstate-types.c', 'vmstate.c', + 'vmstate-event-notifier.c', 'qemu-file.c', 'yank_functions.c', ) diff --git a/migration/vmstate-event-notifier.c b/migration/vmstate-event-n= otifier.c new file mode 100644 index 0000000000..2076eec961 --- /dev/null +++ b/migration/vmstate-event-notifier.c @@ -0,0 +1,54 @@ +/* + * Event notifier migration support + * Copyright (c) Yandex Technologies LLC, 2025 + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qemu/event_notifier.h" +#include "migration/vmstate.h" + +static int event_notifier_pre_save(void *opaque) +{ + struct EventNotifier *e =3D opaque; + + if (!e->initialized || e->rfd !=3D e->wfd) { + return -1; + } + + return 0; +} + +static int event_notifier_pre_load(void *opaque) +{ + struct EventNotifier *e =3D opaque; + + if (e->initialized) { + return -1; + } + + return 0; +} + +static int event_notifier_post_load(void *opaque, int version_id) +{ + struct EventNotifier *e =3D opaque; + + if (e->rfd < 0) { + return -1; + } + + e->wfd =3D e->rfd; + e->initialized =3D true; + + return 0; +} + +const VMStateDescription vmstate_event_notifier =3D { + .name =3D "event-notifier", + .pre_save =3D event_notifier_pre_save, + .pre_load =3D event_notifier_pre_load, + .post_load =3D event_notifier_post_load, + .fields =3D (const VMStateField[]){VMSTATE_FD(rfd, EventNotifier), + VMSTATE_END_OF_LIST()}, +}; --=20 2.48.1