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migration: Postcopy preemption preparation on channel creation

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Create a new socket for postcopy to be prepared to send postcopy requested
pages via this specific channel, so as to not get blocked by precopy pages.

A new thread is also created on dest qemu to receive data from this new channel
based on the ram_load_postcopy() routine.

The ram_load_postcopy(POSTCOPY) branch and the thread has not started to
function, and that'll be done in follow up patches.

Cleanup the new sockets on both src/dst QEMUs, meanwhile look after the new
thread too to make sure it'll be recycled properly.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20220707185502.27149-1-peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
  dgilbert: With Peter's fix to quieten compiler warning on
       start_migration
This commit is contained in:
Peter Xu 2022-07-07 14:55:02 -04:00 • committed by Dr. David Alan Gilbert
parent ce5b0f4afc
commit 36f62f11e4
10 changed files with 219 additions and 31 deletions
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20
migration/savevm.c
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@ -2540,16 +2540,6 @@ static bool postcopy_pause_incoming(MigrationIncomingState *mis)
{
int i;
/*
* If network is interrupted, any temp page we received will be useless
* because we didn't mark them as "received" in receivedmap. After a
* proper recovery later (which will sync src dirty bitmap with receivedmap
* on dest) these cached small pages will be resent again.
*/
for (i = 0; i < mis->postcopy_channels; i++) {
postcopy_temp_page_reset(&mis->postcopy_tmp_pages[i]);
}
trace_postcopy_pause_incoming();
assert(migrate_postcopy_ram());
@ -2578,6 +2568,16 @@ static bool postcopy_pause_incoming(MigrationIncomingState *mis)
/* Notify the fault thread for the invalidated file handle */
postcopy_fault_thread_notify(mis);
/*
* If network is interrupted, any temp page we received will be useless
* because we didn't mark them as "received" in receivedmap. After a
* proper recovery later (which will sync src dirty bitmap with receivedmap
* on dest) these cached small pages will be resent again.
*/
for (i = 0; i < mis->postcopy_channels; i++) {
postcopy_temp_page_reset(&mis->postcopy_tmp_pages[i]);
}
error_report("Detected IO failure for postcopy. "
"Migration paused.");