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112 lines
4.2 KiB
112 lines
4.2 KiB
9 months ago
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From a1f2a51d1a789c46e806adb332236ca16d538bf9 Mon Sep 17 00:00:00 2001
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From: Eric Blake <eblake@redhat.com>
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Date: Tue, 2 May 2023 15:52:12 -0500
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Subject: [PATCH 3/5] migration: Attempt disk reactivation in more failure
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scenarios
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RH-Author: Eric Blake <eblake@redhat.com>
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RH-MergeRequest: 273: migration: prevent source core dump if NFS dies mid-migration
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RH-Bugzilla: 2177957
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: quintela1 <quintela@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Commit: [3/3] e84bf1e7233c0273ca3136ecaa6b2cfc9c0efacb (ebblake/qemu-kvm)
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Commit fe904ea824 added a fail_inactivate label, which tries to
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reactivate disks on the source after a failure while s->state ==
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MIGRATION_STATUS_ACTIVE, but didn't actually use the label if
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qemu_savevm_state_complete_precopy() failed. This failure to
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reactivate is also present in commit 6039dd5b1c (also covering the new
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s->state == MIGRATION_STATUS_DEVICE state) and 403d18ae (ensuring
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s->block_inactive is set more reliably).
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Consolidate the two labels back into one - no matter HOW migration is
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failed, if there is any chance we can reach vm_start() after having
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attempted inactivation, it is essential that we have tried to restart
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disks before then. This also makes the cleanup more like
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migrate_fd_cancel().
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Suggested-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Message-Id: <20230502205212.134680-1-eblake@redhat.com>
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Acked-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 6dab4c93ecfae48e2e67b984d1032c1e988d3005)
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[eblake: downstream migrate_colo() => migrate_colo_enabled()]
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Signed-off-by: Eric Blake <eblake@redhat.com>
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---
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migration/migration.c | 24 ++++++++++++++----------
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1 file changed, 14 insertions(+), 10 deletions(-)
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diff --git a/migration/migration.c b/migration/migration.c
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index 6ba8eb0fdf..817170d52d 100644
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--- a/migration/migration.c
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+++ b/migration/migration.c
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@@ -3255,6 +3255,11 @@ static void migration_completion(MigrationState *s)
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MIGRATION_STATUS_DEVICE);
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}
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if (ret >= 0) {
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+ /*
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+ * Inactivate disks except in COLO, and track that we
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+ * have done so in order to remember to reactivate
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+ * them if migration fails or is cancelled.
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+ */
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s->block_inactive = !migrate_colo_enabled();
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qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
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ret = qemu_savevm_state_complete_precopy(s->to_dst_file, false,
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@@ -3290,13 +3295,13 @@ static void migration_completion(MigrationState *s)
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rp_error = await_return_path_close_on_source(s);
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trace_migration_return_path_end_after(rp_error);
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if (rp_error) {
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- goto fail_invalidate;
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+ goto fail;
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}
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}
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if (qemu_file_get_error(s->to_dst_file)) {
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trace_migration_completion_file_err();
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- goto fail_invalidate;
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+ goto fail;
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}
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if (!migrate_colo_enabled()) {
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@@ -3306,26 +3311,25 @@ static void migration_completion(MigrationState *s)
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return;
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-fail_invalidate:
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- /* If not doing postcopy, vm_start() will be called: let's regain
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- * control on images.
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- */
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- if (s->state == MIGRATION_STATUS_ACTIVE ||
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- s->state == MIGRATION_STATUS_DEVICE) {
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+fail:
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+ if (s->block_inactive && (s->state == MIGRATION_STATUS_ACTIVE ||
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+ s->state == MIGRATION_STATUS_DEVICE)) {
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+ /*
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+ * If not doing postcopy, vm_start() will be called: let's
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+ * regain control on images.
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+ */
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Error *local_err = NULL;
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qemu_mutex_lock_iothread();
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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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- s->block_inactive = true;
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} else {
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s->block_inactive = false;
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}
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qemu_mutex_unlock_iothread();
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}
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-fail:
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migrate_set_state(&s->state, current_active_state,
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MIGRATION_STATUS_FAILED);
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}
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--
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2.39.1
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