motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-05 16:53:55 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

migration: implementation of background snapshot thread

Browse source 
Introducing implementation of 'background' snapshot thread
which in overall follows the logic of precopy migration
while internally utilizes completely different mechanism
to 'freeze' vmstate at the start of snapshot creation.

This mechanism is based on userfault_fd with wr-protection
support and is Linux-specific.

Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20210129101407.103458-5-andrey.gruzdev@virtuozzo.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Andrey Gruzdev 2021-01-29 13:14:06 +03:00 • committed by Dr. David Alan Gilbert
parent 278e2f551a
commit 8518278a6a
4 changed files with 258 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

3
migration/migration.h
View file

@ -20,6 +20,7 @@
#include "qemu/thread.h"
#include "qemu/coroutine_int.h"
#include "io/channel.h"
#include "io/channel-buffer.h"
#include "net/announce.h"
#include "qom/object.h"
@ -147,8 +148,10 @@ struct MigrationState {
/*< public >*/
QemuThread thread;
QEMUBH *vm_start_bh;
QEMUBH *cleanup_bh;
QEMUFile *to_dst_file;
QIOChannelBuffer *bioc;
/*
* Protects to_dst_file pointer. We need to make sure we won't
* yield or hang during the critical section, since this lock will