On Wed, Jul 15, 2020 at 10:54:29AM +0800, Jingqi Liu wrote: > At the end of live migration, QEMU uses msync() to flush the data to > the backend storage. When the backend file is a character device dax, > the pages explicitly avoid the page cache. It will return failure from > msync(). > The following warning is output. > > "warning: qemu_ram_msync: failed to sync memory range“ > > So we add 'pmem=on' to avoid calling msync(), use the QEMU command line: > > -object memory-backend-file,id=mem1,pmem=on,mem-path=/dev/dax0.0,size=4G > > Signed-off-by: Jingqi Liu <jingqi....@intel.com> > --- > docs/nvdimm.txt | 7 +++++++ > 1 file changed, 7 insertions(+)
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
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