At Tue, 9 Jun 2020 00:00:17 +0200, Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote: Subject: Re: regression: xen domU no longer supports "type=cdrom" vbd disk > > On Mon, Jun 08, 2020 at 02:26:39PM -0700, Greg A. Woods wrote: > > 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: > > Actually this change matches what other OSes do with 'devtype=cdrom', > we were an outsider here. > > For PV or PVH domUs you can omit the devtype keyword, it's only > needed for HVM guests (if you want to boot from the cdrom image). Ah OK, I think I understand, thanks! Perhaps this could be mentioned quite explicitly in in the CHANGES file (though that's not the first place I though to look, unfortunately) Maybe the xen/howto on the wiki could be more explicit about mapping a "image.iso" file to a disk vdev (perhaps instead of the currently less helpful suggestions about mapping an existing actual /dev/cd0a device). (Of course the xen/howto could use a lot of help.) (Not to mention but also some upstream Xen docs seem to need updating too, e.g. the xl-disk-configuration(5) manual page (that we unfortunately do not seem to install in the xentools package). Lots of guides mention using "devtype=cdrom" any time an "image.iso" is used.) -- 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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