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migration/ram: ensure write persistence on loading all data to PMEM.

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Because we need to make sure the pmem kind memory data is synced
after migration, we choose to call pmem_persist() when the migration
finish. This will make sure the data of pmem is safe and will not
lose if power is off.

Signed-off-by: Junyan He <junyan.he@intel.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Junyan He 2018-07-18 15:48:03 +08:00 committed by Michael S. Tsirkin
parent 469dd51bc6
commit 56eb90af39
2 changed files with 14 additions and 0 deletions
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6
include/qemu/pmem.h
View File

@ -25,6 +25,12 @@ pmem_memcpy_persist(void *pmemdest, const void *src, size_t len)
return NULL;
}
static inline void
pmem_persist(const void *addr, size_t len)
{
g_assert_not_reached();
}
#endif /* CONFIG_LIBPMEM */
#endif /* !QEMU_PMEM_H */

8
migration/ram.c
View File

@ -33,6 +33,7 @@
#include "qemu/bitops.h"
#include "qemu/bitmap.h"
#include "qemu/main-loop.h"
#include "qemu/pmem.h"
#include "xbzrle.h"
#include "ram.h"
#include "migration.h"
@ -3547,6 +3548,13 @@ static int ram_load_setup(QEMUFile *f, void *opaque)
static int ram_load_cleanup(void *opaque)
{
RAMBlock *rb;
RAMBLOCK_FOREACH_MIGRATABLE(rb) {
if (ramblock_is_pmem(rb)) {
pmem_persist(rb->host, rb->used_length);
}
}
xbzrle_load_cleanup();
compress_threads_load_cleanup();