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Description of problem:

It's not possible to use the 'virsh dump --memory-only' option on
aarch64 at the moment.  It seems to rely on a qemu feature which is
not implemented (even upstream) on aarch64:

$ virsh dump --memory-only guestfs-b1rs92hpq4izkpvi /tmp/guestfs-b1rs92hpq4izkpvi.core
error: Failed to core dump domain guestfs-b1rs92hpq4izkpvi to
/tmp/guestfs-b1rs92hpq4izkpvi.core
error: internal error: unable to execute QEMU command 'dump-guest-memory': this
feature or command is not currently supported

It would be nice to have this on aarch64, since it's the recommended
way to collect a debugging core dump for Linux guest kernels which
have crashed.  (An alternative is to use kdump in the guest, but that
requires prior setup).

Version-Release number of selected component (if applicable):

I tested this in Rawhide:
qemu-2.4.0-2.fc24.aarch64

IIUC, the problem is that the function 'cpu_get_dump_info' is not
implemented for aarch64 (only for x86, ppc and s390x so far).

*** This bug has been marked as a duplicate of bug 1299867 ***