On 3/8/24 13:56, Peter Xu wrote:
On Wed, Mar 06, 2024 at 02:34:25PM +0100, Cédric Le Goater wrote:
This prepares ground for the changes coming next which add an Error**
argument to the .save_setup() handler. Callers of qemu_savevm_state_setup()
now handle the error and fail earlier setting the migration state from
MIGRATION_STATUS_SETUP to MIGRATION_STATUS_FAILED.
In qemu_savevm_state(), move the cleanup to preserve the error
reported by .save_setup() handlers.
Since the previous behavior was to ignore errors at this step of
migration, this change should be examined closely to check that
cleanups are still correctly done.
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---
Changes in v4:
- Merged cleanup change in qemu_savevm_state()
Changes in v3:
- Set migration state to MIGRATION_STATUS_FAILED
- Fixed error handling to be done under lock in bg_migration_thread()
- Made sure an error is always set in case of failure in
qemu_savevm_state_setup()
migration/savevm.h | 2 +-
migration/migration.c | 27 ++++++++++++++++++++++++---
migration/savevm.c | 26 +++++++++++++++-----------
3 files changed, 40 insertions(+), 15 deletions(-)
diff --git a/migration/savevm.h b/migration/savevm.h
index
74669733dd63a080b765866c703234a5c4939223..9ec96a995c93a42aad621595f0ed58596c532328
100644
--- a/migration/savevm.h
+++ b/migration/savevm.h
@@ -32,7 +32,7 @@
bool qemu_savevm_state_blocked(Error **errp);
void qemu_savevm_non_migratable_list(strList **reasons);
int qemu_savevm_state_prepare(Error **errp);
-void qemu_savevm_state_setup(QEMUFile *f);
+int qemu_savevm_state_setup(QEMUFile *f, Error **errp);
bool qemu_savevm_state_guest_unplug_pending(void);
int qemu_savevm_state_resume_prepare(MigrationState *s);
void qemu_savevm_state_header(QEMUFile *f);
diff --git a/migration/migration.c b/migration/migration.c
index
a49fcd53ee19df1ce0182bc99d7e064968f0317b..6d1544224e96f5edfe56939a9c8395d88ef29581
100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -3408,6 +3408,8 @@ static void *migration_thread(void *opaque)
int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
MigThrError thr_error;
bool urgent = false;
+ Error *local_err = NULL;
+ int ret;
thread = migration_threads_add("live_migration", qemu_get_thread_id());
@@ -3451,9 +3453,17 @@ static void *migration_thread(void *opaque)
}
bql_lock();
- qemu_savevm_state_setup(s->to_dst_file);
+ ret = qemu_savevm_state_setup(s->to_dst_file, &local_err);
bql_unlock();
+ if (ret) {
+ migrate_set_error(s, local_err);
+ error_free(local_err);
+ migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
+ MIGRATION_STATUS_FAILED);
+ goto out;
+ }
There's a small indent issue, I can fix it.
checkpatch did report anything.
The bigger problem is I _think_ this will trigger a ci failure in the
virtio-net-failover test:
▶ 121/464 ERROR:../tests/qtest/virtio-net-failover.c:1203:test_migrate_abort_wait_unplug: assertion failed
(status == "cancelling"): ("cancelled" == "cancelling") ERROR
121/464 qemu:qtest+qtest-x86_64 / qtest-x86_64/virtio-net-failover ERROR
4.77s killed by signal 6 SIGABRT
PYTHON=/builds/peterx/qemu/build/pyvenv/bin/python3.8
G_TEST_DBUS_DAEMON=/builds/peterx/qemu/tests/dbus-vmstate-daemon.sh
MALLOC_PERTURB_=161 QTEST_QEMU_IMG=./qemu-img
QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon
QTEST_QEMU_BINARY=./qemu-system-x86_64
/builds/peterx/qemu/build/tests/qtest/virtio-net-failover --tap -k
――――――――――――――――――――――――――――――――――――― ✀ ―――――――――――――――――――――――――――――――――――――
stderr:
qemu-system-x86_64: ram_save_setup failed: Input/output error
**
ERROR:../tests/qtest/virtio-net-failover.c:1203:test_migrate_abort_wait_unplug: assertion failed (status ==
"cancelling"): ("cancelled" == "cancelling")
(test program exited with status code -6)
――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
I am not familiar enough with the failover code, and may not have time
today to follow this up, copy Laurent. Cedric, if you have time, please
have a look.
Sure. Weird because I usually run make check on x86_64, s390x, ppc64 and
aarch64. Let me check again.