It is not safe to pretend that emulated NVDIMM supports
persistence while backend actually failed to enable it
and used non-persistent mapping as fall back.
Instead of falling-back, QEMU should be more strict and
error out with clear message that it's not supported.
So if user asks for persistence (pmem=on), they should
store backing file on NVDIMM.
Signed-off-by: Igor Mammedov <imammedo@xxxxxxxxxx>
---
docs/system/deprecated.rst | 14 ++++++++++++++
util/mmap-alloc.c | 3 +++
2 files changed, 17 insertions(+)
diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst
index bacd76d7a5..ba4f6ed2fe 100644
--- a/docs/system/deprecated.rst
+++ b/docs/system/deprecated.rst
@@ -327,6 +327,20 @@ The Raspberry Pi machines come in various models (A, A+, B, B+). To be able
to distinguish which model QEMU is implementing, the ``raspi2`` and ``raspi3``
machines have been renamed ``raspi2b`` and ``raspi3b``.
+Backend options
+---------------
+
+Using non-persistent backing file with pmem=on (since 6.0)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+This option is used when ``memory-backend-file`` is consumed by emulated NVDIMM
+device. However enabling ``memory-backend-file.pmem`` option, when backing file
+is not DAX capable or not on a filesystem that support direct mapping of persistent
+memory, is not safe and may lead to data loss or corruption in case of host crash.
+Using pmem=on option with such file will return error, instead of a warning.
+Options are to move backing file to NVDIMM storage or modify VM configuration
+to set ``pmem=off`` to continue using fake NVDIMM without persistence guaranties.
+
Device options
--------------
diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
index 27dcccd8ec..d226273a98 100644
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -20,6 +20,7 @@
#include "qemu/osdep.h"
#include "qemu/mmap-alloc.h"
#include "qemu/host-utils.h"
+#include "qemu/error-report.h"
#define HUGETLBFS_MAGIC 0x958458f6
@@ -166,6 +167,8 @@ void *qemu_ram_mmap(int fd,
"crash.\n", file_name);
g_free(proc_link);
g_free(file_name);
+ warn_report("Deprecated using non DAX backing file with"
+ " pmem=on option");
}
/*
* if map failed with MAP_SHARED_VALIDATE | MAP_SYNC,
--
2.27.0
