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From 1669a71fd8a4bd570f09fc2df67279d6936cc5ad Mon Sep 17 00:00:00 2001
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ae23c9 |
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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ae23c9 |
Date: Fri, 22 Jun 2018 19:00:03 +0200
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ae23c9 |
Subject: [PATCH 15/21] migration: Don't activate block devices if using -S
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ae23c9 |
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20180801135522.11658-17-dgilbert@redhat.com>
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Patchwork-id: 81576
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O-Subject: [qemu-kvm RHEL8/virt212 PATCH 16/18] migration: Don't activate block devices if using -S
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Bugzilla: 1594384
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
RH-Acked-by: John Snow <jsnow@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
RH-Acked-by: Juan Quintela <quintela@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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ae23c9 |
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ae23c9 |
Activating the block devices causes the locks to be taken on
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ae23c9 |
the backing file. If we're running with -S and the destination libvirt
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ae23c9 |
hasn't started the destination with 'cont', it's expecting the locks are
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ae23c9 |
still untaken.
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ae23c9 |
Don't activate the block devices if we're not going to autostart the VM;
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ae23c9 |
'cont' already will do that anyway. This change is tied to the new
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ae23c9 |
migration capability 'late-block-activate' that defaults to off, keeping
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ae23c9 |
the old behaviour by default.
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ae23c9 |
bz: https://bugzilla.redhat.com/show_bug.cgi?id=1560854
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
Reviewed-by: Juan Quintela <quintela@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
Signed-off-by: Juan Quintela <quintela@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
(cherry picked from commit 0f073f44df109ea0910d67caede70dec95956ff6)
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---
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migration/migration.c | 34 +++++++++++++++++++++++++++-------
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qapi/migration.json | 5 ++++-
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2 files changed, 31 insertions(+), 8 deletions(-)
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diff --git a/migration/migration.c b/migration/migration.c
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index b6294f6..edf1c06 100644
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--- a/migration/migration.c
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+++ b/migration/migration.c
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@@ -199,6 +199,16 @@ static void migrate_generate_event(int new_state)
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}
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}
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+static bool migrate_late_block_activate(void)
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+{
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+ MigrationState *s;
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+
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+ s = migrate_get_current();
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+
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+ return s->enabled_capabilities[
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+ MIGRATION_CAPABILITY_LATE_BLOCK_ACTIVATE];
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+}
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+
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/*
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* Called on -incoming with a defer: uri.
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* The migration can be started later after any parameters have been
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@@ -308,13 +318,23 @@ static void process_incoming_migration_bh(void *opaque)
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Error *local_err = NULL;
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MigrationIncomingState *mis = opaque;
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- /* Make sure all file formats flush their mutable metadata.
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- * If we get an error here, just don't restart the VM yet. */
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- bdrv_invalidate_cache_all(&local_err);
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- if (local_err) {
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- error_report_err(local_err);
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- local_err = NULL;
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- autostart = false;
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+ /* If capability late_block_activate is set:
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+ * Only fire up the block code now if we're going to restart the
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+ * VM, else 'cont' will do it.
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+ * This causes file locking to happen; so we don't want it to happen
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+ * unless we really are starting the VM.
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+ */
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+ if (!migrate_late_block_activate() ||
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+ (autostart && (!global_state_received() ||
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+ global_state_get_runstate() == RUN_STATE_RUNNING))) {
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+ /* Make sure all file formats flush their mutable metadata.
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+ * If we get an error here, just don't restart the VM yet. */
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+ bdrv_invalidate_cache_all(&local_err);
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+ if (local_err) {
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+ error_report_err(local_err);
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+ local_err = NULL;
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+ autostart = false;
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+ }
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}
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/*
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diff --git a/qapi/migration.json b/qapi/migration.json
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index 9d0bf82..618d2de 100644
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--- a/qapi/migration.json
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+++ b/qapi/migration.json
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@@ -357,13 +357,16 @@
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# @dirty-bitmaps: If enabled, QEMU will migrate named dirty bitmaps.
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# (since 2.12)
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#
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+# @late-block-activate: If enabled, the destination will not activate block
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+# devices (and thus take locks) immediately at the end of migration.
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+# (since 3.0)
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# Since: 1.2
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##
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{ 'enum': 'MigrationCapability',
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'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
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'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
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'block', 'return-path', 'pause-before-switchover', 'x-multifd',
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- 'dirty-bitmaps' ] }
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+ 'dirty-bitmaps', 'late-block-activate' ] }
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##
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# @MigrationCapabilityStatus:
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--
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1.8.3.1
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