xen: use a common function for pv and hvm guest backend register calls
Instead of calling xen_be_register() for each supported backend type for hvm and pv guests in their machine init functions use a common function in order not to have to add new backends twice. This at once fixes the error that hvm domains couldn't use the qusb backend. Signed-off-by: NJuergen Gross <jgross@suse.com> Acked-by: NAnthony PERARD <anthony.perard@citrix.com> Message-id: 1470119552-16170-1-git-send-email-jgross@suse.com Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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