From nobody Thu Nov 6 06:14:52 2025 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 1539286249606437.51661011244846; Thu, 11 Oct 2018 12:30:49 -0700 (PDT) Received: from localhost ([::1]:36318 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gAgfY-0008UX-EL for importer@patchew.org; Thu, 11 Oct 2018 15:30:48 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44867) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gAgaZ-0004vf-PT for qemu-devel@nongnu.org; Thu, 11 Oct 2018 15:25:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gAgaU-0001dS-Tz for qemu-devel@nongnu.org; Thu, 11 Oct 2018 15:25:39 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47238) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gAgaU-0001X0-Fm for qemu-devel@nongnu.org; Thu, 11 Oct 2018 15:25:34 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DB426C05001D; Thu, 11 Oct 2018 19:25:28 +0000 (UTC) Received: from dgilbert-t530.redhat.com (ovpn-117-217.ams2.redhat.com [10.36.117.217]) by smtp.corp.redhat.com (Postfix) with ESMTP id 33B6B8543A; Thu, 11 Oct 2018 19:25:27 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, quintela@redhat.com Date: Thu, 11 Oct 2018 20:25:09 +0100 Message-Id: <20181011192513.63634-4-dgilbert@redhat.com> In-Reply-To: <20181011192513.63634-1-dgilbert@redhat.com> References: <20181011192513.63634-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Thu, 11 Oct 2018 19:25:28 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 3/7] migration: Stop postcopy fault thread before notifying 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: wei@redhat.com, i.maximets@samsung.com, thuth@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RDMRC_1 RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" From: Ilya Maximets POSTCOPY_NOTIFY_INBOUND_END handlers will remove userfault fds from the postcopy_remote_fds array which could be still in use by the fault thread. Let's stop the thread before notification to avoid possible accessing wrong memory. Fixes: 46343570c06e ("vhost+postcopy: Wire up POSTCOPY_END notify") Cc: qemu-stable@nongnu.org Signed-off-by: Ilya Maximets Message-Id: <20181008160536.6332-2-i.maximets@samsung.com> Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Maxime Coquelin Signed-off-by: Dr. David Alan Gilbert --- migration/postcopy-ram.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index 853d8b32ca..e5c02a32c5 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -533,6 +533,12 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingSta= te *mis) if (mis->have_fault_thread) { Error *local_err =3D NULL; =20 + /* Let the fault thread quit */ + atomic_set(&mis->fault_thread_quit, 1); + postcopy_fault_thread_notify(mis); + trace_postcopy_ram_incoming_cleanup_join(); + qemu_thread_join(&mis->fault_thread); + if (postcopy_notify(POSTCOPY_NOTIFY_INBOUND_END, &local_err)) { error_report_err(local_err); return -1; @@ -541,11 +547,6 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingSta= te *mis) if (qemu_ram_foreach_migratable_block(cleanup_range, mis)) { return -1; } - /* Let the fault thread quit */ - atomic_set(&mis->fault_thread_quit, 1); - postcopy_fault_thread_notify(mis); - trace_postcopy_ram_incoming_cleanup_join(); - qemu_thread_join(&mis->fault_thread); =20 trace_postcopy_ram_incoming_cleanup_closeuf(); close(mis->userfault_fd); --=20 2.19.0