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migration: MigrationEvent for notifiers

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Passing MigrationState to notifiers is unsound because they could access
unstable migration state internals or even modify the state.  Instead, pass
the minimal info needed in a new MigrationEvent struct, which could be
extended in the future if needed.

Suggested-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/1708622920-68779-5-git-send-email-steven.sistare@oracle.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Steve Sistare 2024-02-22 09:28:30 -08:00 • committed by Peter Xu
parent 3e7757301c
commit 9d9babf78d
7 changed files with 51 additions and 27 deletions
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11
hw/net/virtio-net.c
View file

@ -3504,7 +3504,7 @@ out:
return !err;
}
static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationEvent *e)
{
bool should_be_hidden;
Error *err = NULL;
@ -3516,7 +3516,7 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
should_be_hidden = qatomic_read(&n->failover_primary_hidden);
if (migration_in_setup(s) && !should_be_hidden) {
if (e->type == MIG_EVENT_PRECOPY_SETUP && !should_be_hidden) {
if (failover_unplug_primary(n, dev)) {
vmstate_unregister(VMSTATE_IF(dev), qdev_get_vmsd(dev), dev);
qapi_event_send_unplug_primary(dev->id);
@ -3524,7 +3524,7 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
} else {
warn_report("couldn't unplug primary device");
}
} else if (migration_has_failed(s)) {
} else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
/* We already unplugged the device let's plug it back */
if (!failover_replug_primary(n, dev, &err)) {
if (err) {
@ -3537,9 +3537,10 @@ static void virtio_net_handle_migration_primary(VirtIONet *n, MigrationState *s)
static int virtio_net_migration_state_notifier(NotifierWithReturn *notifier,
void *data, Error **errp)
{
MigrationState *s = data;
MigrationEvent *e = data;
VirtIONet *n = container_of(notifier, VirtIONet, migration_state);
virtio_net_handle_migration_primary(n, s);
virtio_net_handle_migration_primary(n, e);
return 0;
}