xen/balloon: improve accuracy of initial balloon target for dom0

xen/balloon: improve accuracy of initial balloon target for dom0

The dom0 balloon target set by the toolstack is the value returned by
XENMEM_current_reservation.  Do the same in the kernel balloon driver and
set the current allocation to the value returned by
XENMEM_current_reservation.  On my test system this causes the kernel
balloon driver target to exactly match the value set by the toolstack in
xenstore.

Note this approach can be used by both PV and PVH dom0s, as the toolstack
always uses XENMEM_current_reservation to set the initial target regardless
of the dom0 type.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20260128110510.46425-3-roger.pau@citrix.com>