vfio-ccw: remove orb.c64 (64 bit data addresses) check

The vfio-ccw module does the check too, and there is actually no
technical obstacle for supporting fmt 1 idaws. Let us be ready for the
beautiful day when fmt 1 idaws become supported by the vfio-ccw kernel
module. QEMU does not have to do a thing for that, except not insisting
on this check.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Acked-by: Jason J. Herne <jjherne@linux.ibm.com>
Tested-by: Jason J. Herne <jjherne@linux.ibm.com>
Message-Id: <20180524175828.3143-3-pasic@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

hw/s390x/css.c

@@ -1199,17 +1199,6 @@ static IOInstEnding sch_handle_start_func_passthrough(SubchDev *sch)
         assert(orb != NULL);
         p->intparm = orb->intparm;
     }
-
-    /*
-     * Only support prefetch enable mode.
-     * Only support 64bit addressing idal.
-     */
-    if (!(orb->ctrl0 & ORB_CTRL0_MASK_C64)) {
-        warn_report("vfio-ccw requires PFCH and C64 flags set");
-        sch_gen_unit_exception(sch);
-        css_inject_io_interrupt(sch);
-        return IOINST_CC_EXPECTED;
-    }
     return s390_ccw_cmd_request(sch);
 }