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authorAndrey Gruzdev <andrey.gruzdev@virtuozzo.com>2021-01-29 13:14:05 +0300
committerDr. David Alan Gilbert <dgilbert@redhat.com>2021-02-08 11:19:51 +0000
commit278e2f551a095b234de74dca9c214d5502a1f72c (patch)
tree0759c7262dc70c647fcfb12fdc9905e81666b022 /migration/ram.h
parent0e9b5cd6b238b7ca9a3a50d957f50c37082705a0 (diff)
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migration: support UFFD write fault processing in ram_save_iterate()
In this particular implementation the same single migration thread is responsible for both normal linear dirty page migration and procesing UFFD page fault events. Processing write faults includes reading UFFD file descriptor, finding respective RAM block and saving faulting page to the migration stream. After page has been saved, write protection can be removed. Since asynchronous version of qemu_put_buffer() is expected to be used to save pages, we also have to flush migraion stream prior to un-protecting saved memory range. Write protection is being removed for any previously protected memory chunk that has hit the migration stream. That's valid for pages from linear page scan along with write fault pages. 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: <20210129101407.103458-4-andrey.gruzdev@virtuozzo.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> fixup pagefault.address cast for 32bit
Diffstat (limited to 'migration/ram.h')
-rw-r--r--migration/ram.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/migration/ram.h b/migration/ram.h
index 1a9ff90..c25540c 100644
--- a/migration/ram.h
+++ b/migration/ram.h
@@ -82,5 +82,7 @@ void colo_incoming_start_dirty_log(void);
/* Background snapshot */
bool ram_write_tracking_available(void);
bool ram_write_tracking_compatible(void);
+int ram_write_tracking_start(void);
+void ram_write_tracking_stop(void);
#endif