On Mon, May 16, 2016 at 04:04:01PM +0100, Richard W.M. Jones wrote: > I'm playing with ext4 and DAX. > > I'm using: > > -object memory-backend-file,id=mem1,share,mem-path=/var/tmp/pmem,size=4G \ > -device nvdimm,memdev=mem1,id=nv1 > > where /var/tmp/pmem is a 4 GB ext4 filesystem image (no partition > table). I can mount this in the guest using: > > mount -o dax /dev/pmem0 /mnt > > and everything appears to work. > > I read in the mailing list that the pmem file has some internal > structure for storing config data, stored in the last 128 KB of the > file. Is that still the case?
AFAICT qemu.git/master does not support the ACPI _DSM for namespace configuration. That means the entire /var/tmp/pmem should be visible. Stefan
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