From: Junyan He <junyan...@intel.com> 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...@intel.com> Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com> Reviewed-by: Igor Mammedov <imamm...@redhat.com> --- include/qemu/pmem.h | 1 + migration/ram.c | 10 +++++++++- stubs/pmem.c | 4 ++++ 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/include/qemu/pmem.h b/include/qemu/pmem.h index 00d6680..8f52b08 100644 --- a/include/qemu/pmem.h +++ b/include/qemu/pmem.h @@ -17,6 +17,7 @@ #else /* !CONFIG_LIBPMEM */ void *pmem_memcpy_persist(void *pmemdest, const void *src, size_t len); +void pmem_persist(const void *addr, size_t len); #endif /* CONFIG_LIBPMEM */ diff --git a/migration/ram.c b/migration/ram.c index 9c03e2b..62dfe75 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -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" @@ -3541,6 +3542,13 @@ 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(); @@ -3896,7 +3904,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) static bool ram_has_postcopy(void *opaque) { RAMBlock *rb; - RAMBLOCK_FOREACH(rb) { + RAMBLOCK_FOREACH_MIGRATABLE(rb) { if (ramblock_is_pmem(rb)) { info_report("Block: %s, host: %p is a nvdimm memory, postcopy" "is not supported now!", rb->idstr, rb->host); diff --git a/stubs/pmem.c b/stubs/pmem.c index b4ec72d..f794262 100644 --- a/stubs/pmem.c +++ b/stubs/pmem.c @@ -17,3 +17,7 @@ void *pmem_memcpy_persist(void *pmemdest, const void *src, size_t len) { return memcpy(pmemdest, src, len); } + +void pmem_persist(const void *addr, size_t len) +{ +} -- 2.7.4