Re: port-xen/59451: XEN3_DOM0 kernel finds the wrong root device

["Michael van Elst via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-xen/59451; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-xen/59451: XEN3_DOM0 kernel finds the wrong root device
Date: Mon, 2 Jun 2025 20:21:10 -0000 (UTC)

 gnats-admin%NetBSD.org@localhost ("Chuck Zmudzinski via gnats") writes:
 
 > If I create a wedge, say it's dk2, on a host Xen dom0 system that
 > is set to be the virtual disk of a Xen domU and in the guest
 > domU I write a disklabel on that virtual disk, will those partitions
 > on the virtual disk in the guest domU show up on the host Xen dom0
 > system as devices with names like /dev/dk2a, /dev/dk2b, etc.?
 
 The partitions will not show up. The dk driver doesn't know
 anything about partitions. You can't open a partition, there
 are no ioctls that handle partition information. The bits of
 a disklabel on the storage are just bits that you can read.
 
 The disklabel command can be told to read the bits from a file (-F),
 and that also works for a wedge device. But that would only
 print the disklabel bits, otherwise it has no meaning for the
 Dom0.