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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