Xen 4.13 HVM and xvd

[T <bobs%thelibertytree.org@localhost>]

Hello, has anyone else had problems with Xen 4.13 and using xvd* when 
specifying storage devices with HVMs? This did not seem to be an issue 
previously with NetBSD 8.*/7.* with Xen 4.11, but has manifested when 
upgrading to NetBSD 9.1 with Xen 4.13 on two different machines. In one 
instance, the use of xvd* caused the host to crash and restart. In other 
instances, the HVM BIOS will be unable to recognize the devices as valid 
BIOS partitions and enter into a loop of trying different boot devices. 
Changing the storage devices in the Xen configuration file to use sd* 
will work around the issue, but require existing installations to be 
modified to use that specific device.

Only HVMs are used on these Xen hosts, so other VM types have not been 
tested. If I remember correctly, one of the hosts was upgraded to NetBSD 
9.1, while still retaining Xen 4.11, and no issues where experienced, so 
the problem occurred with the migration to Xen 4.13 .
-Tim