From nobody Mon Feb 9 11:29:53 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1520587856376103.25537801186658; Fri, 9 Mar 2018 01:30:56 -0800 (PST) Received: from localhost ([::1]:44030 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1euEMV-0007vf-FR for importer@patchew.org; Fri, 09 Mar 2018 04:30:51 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45111) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1euE8c-00043L-SA for qemu-devel@nongnu.org; Fri, 09 Mar 2018 04:16:31 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1euE8b-00066M-OZ for qemu-devel@nongnu.org; Fri, 09 Mar 2018 04:16:30 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:49760 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1euE8b-00065X-Il for qemu-devel@nongnu.org; Fri, 09 Mar 2018 04:16:29 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 352D6402277B; Fri, 9 Mar 2018 09:16:29 +0000 (UTC) Received: from xz-mi.redhat.com (ovpn-12-92.pek2.redhat.com [10.72.12.92]) by smtp.corp.redhat.com (Postfix) with ESMTP id 71247215CDA7; Fri, 9 Mar 2018 09:16:26 +0000 (UTC) From: Peter Xu To: qemu-devel@nongnu.org Date: Fri, 9 Mar 2018 17:15:27 +0800 Message-Id: <20180309091535.13315-16-peterx@redhat.com> In-Reply-To: <20180309091535.13315-1-peterx@redhat.com> References: <20180309091535.13315-1-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 09 Mar 2018 09:16:29 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Fri, 09 Mar 2018 09:16:29 +0000 (UTC) for IP:'10.11.54.6' DOMAIN:'int-mx06.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'peterx@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v7 15/23] migration: introduce SaveVMHandlers.resume_prepare X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrea Arcangeli , Juan Quintela , Alexey Perevalov , peterx@redhat.com, "Dr . David Alan Gilbert" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This is hook function to be called when a postcopy migration wants to resume from a failure. For each module, it should provide its own recovery logic before we switch to the postcopy-active state. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu --- include/migration/register.h | 2 ++ migration/migration.c | 20 +++++++++++++++++++- migration/savevm.c | 25 +++++++++++++++++++++++++ migration/savevm.h | 1 + migration/trace-events | 1 + 5 files changed, 48 insertions(+), 1 deletion(-) diff --git a/include/migration/register.h b/include/migration/register.h index f4f7bdc177..128124f008 100644 --- a/include/migration/register.h +++ b/include/migration/register.h @@ -42,6 +42,8 @@ typedef struct SaveVMHandlers { LoadStateHandler *load_state; int (*load_setup)(QEMUFile *f, void *opaque); int (*load_cleanup)(void *opaque); + /* Called when postcopy migration wants to resume from failure */ + int (*resume_prepare)(MigrationState *s, void *opaque); } SaveVMHandlers; =20 int register_savevm_live(DeviceState *dev, diff --git a/migration/migration.c b/migration/migration.c index f2aca30438..a2b98afb4d 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -2383,7 +2383,25 @@ typedef enum MigThrError { /* Return zero if success, or <0 for error */ static int postcopy_do_resume(MigrationState *s) { - /* TODO: do the resume logic */ + int ret; + + /* + * Call all the resume_prepare() hooks, so that modules can be + * ready for the migration resume. + */ + ret =3D qemu_savevm_state_resume_prepare(s); + if (ret) { + error_report("%s: resume_prepare() failure detected: %d", + __func__, ret); + return ret; + } + + /* + * TODO: handshake with dest using MIG_CMD_RESUME, + * MIG_RP_MSG_RESUME_ACK, then switch source state to + * "postcopy-active" + */ + return 0; } =20 diff --git a/migration/savevm.c b/migration/savevm.c index 333fb09953..7f4899ae9c 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -1030,6 +1030,31 @@ void qemu_savevm_state_setup(QEMUFile *f) } } =20 +int qemu_savevm_state_resume_prepare(MigrationState *s) +{ + SaveStateEntry *se; + int ret; + + trace_savevm_state_resume_prepare(); + + QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { + if (!se->ops || !se->ops->resume_prepare) { + continue; + } + if (se->ops && se->ops->is_active) { + if (!se->ops->is_active(se->opaque)) { + continue; + } + } + ret =3D se->ops->resume_prepare(s, se->opaque); + if (ret < 0) { + return ret; + } + } + + return 0; +} + /* * this function has three return values: * negative: there was one error, and we have -errno. diff --git a/migration/savevm.h b/migration/savevm.h index a5f3879191..3193f04cca 100644 --- a/migration/savevm.h +++ b/migration/savevm.h @@ -31,6 +31,7 @@ =20 bool qemu_savevm_state_blocked(Error **errp); void qemu_savevm_state_setup(QEMUFile *f); +int qemu_savevm_state_resume_prepare(MigrationState *s); void qemu_savevm_state_header(QEMUFile *f); int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy); void qemu_savevm_state_cleanup(void); diff --git a/migration/trace-events b/migration/trace-events index 7422a395da..fe46b2c6c5 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -39,6 +39,7 @@ savevm_send_postcopy_run(void) "" savevm_send_postcopy_resume(void) "" savevm_send_recv_bitmap(char *name) "%s" savevm_state_setup(void) "" +savevm_state_resume_prepare(void) "" savevm_state_header(void) "" savevm_state_iterate(void) "" savevm_state_cleanup(void) "" --=20 2.14.3