From nobody Mon Feb 9 06:49:13 2026 Delivered-To: importer@patchew.org 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; Authentication-Results: mx.zohomail.com; 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=fail(p=none dis=none) header.from=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1579699802; cv=none; d=zohomail.com; s=zohoarc; b=HzzgfQYkvFv5ZFSj/z/elKbWc0FxZh8t/vIzGgwAL5CNEqc+LAhsne+odH7kg6tke7UH3PDnQM+z1b8KqE1DvtyCk+glnhWlgkm34xIB06gvTwka4K/KtBUCd8LGeq5IIUnvPrXiT5RHvXfxPVtuLaRk5ydugs0BpfxuKr4EguE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1579699802; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=jr/CuEii/5juAma14CzhOGKbXmigY9umWzzvZw5Zph8=; b=ZIL8zpBijP/lHPFarmiwRr6wp2PWL/W3iEIYPw69zBR1JW7tmPlcmJed1DKjdfyeCjzDKHcREzBNcDpbDDPZfV7K6P7FkQSfUYss+pfAF4q0VAj32wI26EXhKFymTKTMPTGTcvwn/ULokmy9jj3MbWw9HyA7nBphNtC/3h5+qww= ARC-Authentication-Results: i=1; mx.zohomail.com; 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=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1579699802623568.6261876547981; Wed, 22 Jan 2020 05:30:02 -0800 (PST) Received: from localhost ([::1]:42110 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuG53-00068g-3I for importer@patchew.org; Wed, 22 Jan 2020 08:30:01 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51925) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iuFyx-0006n4-0N for qemu-devel@nongnu.org; Wed, 22 Jan 2020 08:23:44 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iuFyv-0002Mu-M5 for qemu-devel@nongnu.org; Wed, 22 Jan 2020 08:23:42 -0500 Received: from relay.sw.ru ([185.231.240.75]:42280) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iuFys-0002Hv-Ny; Wed, 22 Jan 2020 08:23:38 -0500 Received: from vovaso.qa.sw.ru ([10.94.3.0] helo=kvm.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.92.3) (envelope-from ) id 1iuFyk-00057B-8v; Wed, 22 Jan 2020 16:23:30 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH 5/7] migration/block-dirty-bitmap: cancel migration on shutdown Date: Wed, 22 Jan 2020 16:23:26 +0300 Message-Id: <20200122132328.31156-6-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200122132328.31156-1-vsementsov@virtuozzo.com> References: <20200122132328.31156-1-vsementsov@virtuozzo.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 185.231.240.75 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, fam@euphon.net, vsementsov@virtuozzo.com, quintela@redhat.com, dgilbert@redhat.com, mreitz@redhat.com, stefanha@redhat.com, jsnow@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" If target is turned of prior to postcopy finished, we crash because busy bitmaps are found at shutdown. Let's fix it by removing all unfinished bitmaps on shutdown. Signed-off-by: Vladimir Sementsov-Ogievskiy --- migration/migration.h | 1 + migration/block-dirty-bitmap.c | 44 ++++++++++++++++++++++++++++++---- migration/migration.c | 7 ++++++ 3 files changed, 48 insertions(+), 4 deletions(-) diff --git a/migration/migration.h b/migration/migration.h index aa9ff6f27b..a3927b93bb 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -331,6 +331,7 @@ void migrate_send_rp_recv_bitmap(MigrationIncomingState= *mis, void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t valu= e); =20 void dirty_bitmap_mig_before_vm_start(void); +void dirty_bitmap_mig_cancel_incoming(void); void init_dirty_bitmap_incoming_migration(void); void migrate_add_address(SocketAddress *address); =20 diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c index f96458113c..5a98543672 100644 --- a/migration/block-dirty-bitmap.c +++ b/migration/block-dirty-bitmap.c @@ -143,6 +143,7 @@ typedef struct DirtyBitmapLoadState { =20 bool bitmaps_enabled; /* set in dirty_bitmap_mig_before_vm_start */ bool stream_ended; /* set when all migrated data handled */ + bool cancelled; =20 GSList *bitmaps; QemuMutex lock; /* protect bitmaps */ @@ -533,8 +534,6 @@ static void dirty_bitmap_load_complete(QEMUFile *f) trace_dirty_bitmap_load_complete(); bdrv_dirty_bitmap_deserialize_finish(s->bitmap); =20 - qemu_mutex_lock(&dbm_load_state.lock); - if (bdrv_dirty_bitmap_has_successor(s->bitmap)) { bdrv_reclaim_dirty_bitmap(s->bitmap, &error_abort); } @@ -547,8 +546,6 @@ static void dirty_bitmap_load_complete(QEMUFile *f) break; } } - - qemu_mutex_unlock(&dbm_load_state.lock); } =20 static int dirty_bitmap_load_bits(QEMUFile *f) @@ -656,6 +653,13 @@ static int dirty_bitmap_load(QEMUFile *f, void *opaque= , int version_id) } =20 do { + qemu_mutex_lock(&dbm_load_state.lock); + + if (dbm_load_state.cancelled) { + qemu_mutex_unlock(&dbm_load_state.lock); + break; + } + ret =3D dirty_bitmap_load_header(f); if (ret < 0) { return ret; @@ -676,6 +680,8 @@ static int dirty_bitmap_load(QEMUFile *f, void *opaque,= int version_id) if (ret) { return ret; } + + qemu_mutex_unlock(&dbm_load_state.lock); } while (!(dbm_load_state.flags & DIRTY_BITMAP_MIG_FLAG_EOS)); =20 qemu_mutex_lock(&dbm_load_state.lock); @@ -692,6 +698,36 @@ static int dirty_bitmap_load(QEMUFile *f, void *opaque= , int version_id) return 0; } =20 +void dirty_bitmap_mig_cancel_incoming(void) +{ + GSList *item; + + qemu_mutex_lock(&dbm_load_state.lock); + + if (dbm_load_state.bitmaps_enabled && dbm_load_state.stream_ended) { + qemu_mutex_unlock(&dbm_load_state.lock); + return; + } + + dbm_load_state.cancelled =3D true; + + for (item =3D dbm_load_state.bitmaps; item; item =3D g_slist_next(item= )) { + DirtyBitmapLoadBitmapState *b =3D item->data; + + if (!dbm_load_state.bitmaps_enabled || !b->migrated) { + if (bdrv_dirty_bitmap_has_successor(b->bitmap)) { + bdrv_reclaim_dirty_bitmap(b->bitmap, &error_abort); + } + bdrv_release_dirty_bitmap(b->bitmap); + } + } + + g_slist_free_full(dbm_load_state.bitmaps, g_free); + dbm_load_state.bitmaps =3D NULL; + + qemu_mutex_unlock(&dbm_load_state.lock); +} + static int dirty_bitmap_save_setup(QEMUFile *f, void *opaque) { DirtyBitmapMigBitmapState *dbms =3D NULL; diff --git a/migration/migration.c b/migration/migration.c index 990bff00c0..12d161165d 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -182,6 +182,13 @@ void migration_shutdown(void) */ migrate_fd_cancel(current_migration); object_unref(OBJECT(current_migration)); + + /* + * Cancel incoming migration of dirty bitmaps. Dirty bitmaps + * are non-critical data, and their loss never considered as + * something serious. + */ + dirty_bitmap_mig_cancel_incoming(); } =20 /* For outgoing */ --=20 2.21.0