I use xl.cfg "disk" entries like the following to mount a virtual CDROM
in a Xen domU:
'format=raw, vdev=0x5, access=ro, devtype=cdrom, target=/images/NetBSD-9.0-amd64.iso'
However since upgrading my -current source tree I've been seeing:
xenbus0: ignoring device/vbd/4 type cdrom
As shown in this patch I had to comment out the core of the mentioned
change to be able to use an ISO image again as a virtual CDROM again:
--- xenbus_probe.c.~1.55.~ 2020-05-30 17:32:39.672816814 -0700
+++ xenbus_probe.c 2020-06-08 14:13:45.025527521 -0700
@@ -443,6 +443,14 @@
kmem_free(xbusd, xbusd->xbusd_sz);
break;
}
+//revision 1.51
+//date: 2020-04-28 06:21:01 -0700; author: bouyer; state: Exp; lines: +30 -9; commitid: 5XOy6F9zbgN8C96C;
+//Skip block device with device-type "cdrom", as their emulation can't be
+//disabled; and the backend driver doesn't handle them either.
+//Fix hang when booting with 'ioemu:hdc:cdrom' type disks.
+//While there convert some printf to aprint_error()
+//
+#if 0 /* XXX breaks use of ISO files! */
if (strcmp(xa.xa_type, "vbd") == 0) {
char dtype[10];
if (xenbus_read(NULL, xbusd->xbusd_path,
@@ -461,6 +469,7 @@
continue;
}
}
+#endif
err = read_backend_details(xbusd);
if (err != 0) {
aprint_error_dev(xenbus_dev,
Now it works again:
xbd4 at xenbus0 id 4: Xen Virtual Block Device Interface
xbd4: using event channel 12
...
boot device: xbd4
root on xbd4a dumps on xbd4b
root file system type: cd9660
--
Greg A. Woods <gwoods%acm.org@localhost>
Kelowna, BC +1 250 762-7675 RoboHack <woods%robohack.ca@localhost>
Planix, Inc. <woods%planix.com@localhost> Avoncote Farms <woods%avoncote.ca@localhost>
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