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migration: Centralize BH creation and dispatch

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Now that the migration state reference counting is correct, further
wrap the bottom half dispatch process to avoid future issues.

Move BH creation and scheduling together and wrap the dispatch with an
intermediary function that will ensure we always keep the ref/unref
balanced.

Also move the responsibility of deleting the BH into the wrapper and
remove the now unnecessary pointers.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240119233922.32588-6-farosas@suse.de
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Fabiano Rosas 2024-01-19 20:39:22 -03:00 • committed by Peter Xu
parent 699d9476a0
commit 44d0d456d7
3 changed files with 40 additions and 37 deletions
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5
migration/migration.h
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@ -159,8 +159,6 @@ struct MigrationIncomingState {
/* PostCopyFD's for external userfaultfds & handlers of shared memory */
GArray *postcopy_remote_fds;
QEMUBH *bh;
int state;
/*
@ -255,8 +253,6 @@ struct MigrationState {
/*< public >*/
QemuThread thread;
QEMUBH *vm_start_bh;
QEMUBH *cleanup_bh;
/* Protected by qemu_file_lock */
QEMUFile *to_dst_file;
/* Postcopy specific transfer channel */
@ -528,6 +524,7 @@ int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque);
void migration_make_urgent_request(void);
void migration_consume_urgent_request(void);
bool migration_rate_limit(void);
void migration_bh_schedule(QEMUBHFunc *cb, void *opaque);
void migration_cancel(const Error *error);
void migration_populate_vfio_info(MigrationInfo *info);