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migration: Add postcopy_thread_create()

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Postcopy create threads. A common manner is we init a sem and use it to sync
with the thread.  Namely, we have fault_thread_sem and listen_thread_sem and
they're only used for this.

Make it a shared infrastructure so it's easier to create yet another thread.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20220301083925.33483-7-peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Peter Xu 2022-03-01 16:39:06 +08:00 • committed by Dr. David Alan Gilbert
parent cfc7dc8abf
commit 095c12a4a2
4 changed files with 29 additions and 18 deletions
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8
migration/migration.h
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@ -70,7 +70,11 @@ struct MigrationIncomingState {
/* A hook to allow cleanup at the end of incoming migration */
void *transport_data;
void (*transport_cleanup)(void *data);
/*
* Used to sync thread creations. Note that we can't create threads in
* parallel with this sem.
*/
QemuSemaphore thread_sync_sem;
/*
* Free at the start of the main state load, set as the main thread finishes
* loading state.
@ -83,13 +87,11 @@ struct MigrationIncomingState {
size_t largest_page_size;
bool have_fault_thread;
QemuThread fault_thread;
QemuSemaphore fault_thread_sem;
/* Set this when we want the fault thread to quit */
bool fault_thread_quit;
bool have_listen_thread;
QemuThread listen_thread;
QemuSemaphore listen_thread_sem;
/* For the kernel to send us notifications */
int userfault_fd;