From fd6f516a94e635bc42e58448f314db575814a834 Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Thu, 31 Mar 2022 11:08:45 -0400 Subject: [PATCH 18/18] migration: Allow migrate-recover to run multiple times MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Peter Xu RH-MergeRequest: 104: migration: Allow migrate-recover to run multiple times RH-Commit: [1/1] afd726e54c069ae800e2d01f34e768d6bac7dcb9 (peterx/qemu-kvm) RH-Bugzilla: 2096143 RH-Acked-by: Miroslav Rezanina RH-Acked-by: Hanna Reitz RH-Acked-by: Dr. David Alan Gilbert Previously migration didn't have an easy way to cleanup the listening transport, migrate recovery only allows to execute once. That's done with a trick flag in postcopy_recover_triggered. Now the facility is already there. Drop postcopy_recover_triggered and instead allows a new migrate-recover to release the previous listener transport. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu Message-Id: <20220331150857.74406-8-peterx@redhat.com> Reviewed-by: Daniel P. Berrangé Signed-off-by: Dr. David Alan Gilbert (cherry picked from commit 08401c0426bc1a5ce4609afd1cda5dd39abbf9fa) Signed-off-by: Peter Xu --- migration/migration.c | 13 ++----------- migration/migration.h | 1 - migration/savevm.c | 3 --- 3 files changed, 2 insertions(+), 15 deletions(-) diff --git a/migration/migration.c b/migration/migration.c index 2a141bfaf3..8fb3eae910 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -2166,11 +2166,8 @@ void qmp_migrate_recover(const char *uri, Error **errp) return; } - if (qatomic_cmpxchg(&mis->postcopy_recover_triggered, - false, true) == true) { - error_setg(errp, "Migrate recovery is triggered already"); - return; - } + /* If there's an existing transport, release it */ + migration_incoming_transport_cleanup(mis); /* * Note that this call will never start a real migration; it will @@ -2178,12 +2175,6 @@ void qmp_migrate_recover(const char *uri, Error **errp) * to continue using that newly established channel. */ qemu_start_incoming_migration(uri, errp); - - /* Safe to dereference with the assert above */ - if (*errp) { - /* Reset the flag so user could still retry */ - qatomic_set(&mis->postcopy_recover_triggered, false); - } } void qmp_migrate_pause(Error **errp) diff --git a/migration/migration.h b/migration/migration.h index c2cabb8a14..fbc8690ec8 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -139,7 +139,6 @@ struct MigrationIncomingState { struct PostcopyBlocktimeContext *blocktime_ctx; /* notify PAUSED postcopy incoming migrations to try to continue */ - bool postcopy_recover_triggered; QemuSemaphore postcopy_pause_sem_dst; QemuSemaphore postcopy_pause_sem_fault; diff --git a/migration/savevm.c b/migration/savevm.c index 02ed94c180..d9076897b8 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2589,9 +2589,6 @@ static bool postcopy_pause_incoming(MigrationIncomingState *mis) assert(migrate_postcopy_ram()); - /* Clear the triggered bit to allow one recovery */ - mis->postcopy_recover_triggered = false; - /* * Unregister yank with either from/to src would work, since ioc behind it * is the same -- 2.35.3