[Xen-devel] /sys/hypervisor entries for Xen (Domain-0, PV, PVH and HVM)

[Steven Haigh <netwiz@xxxxxxxxx>]

Hi all,

I'm working on fixing up the grub packages for Fedora in deducing the 
new BLS logic in Fedora and disabling it in non-compatible environments.
BZ Report:
https://bugzilla.redhat.com/show_bug.cgi?id=1703700

Currently, it seems that we can deduce the following two scenarios:

in /sys/hypervisor:

1) type == xen && uuid == all zeros, then this is BLS safe (the 
Domain-0).
2) type == xen && uuid != all zeros, then this is BLS *unsafe* (covers 
PV, HVM and PVH guests).
Is there any other variables that come into effect that could cause a 
variation in the above checks as to enable or disable BLS?
Right now, I'm proposing that we try to disable the new BLS behaviour 
in Fedora for PV, HVM and PVH guests - as pygrub is not up to the task 
of booting them. We included HVM as it may be common for users to 
switch between HVM and PVH configurations for the same installed VM.
Any comments either here or via the BZ report above would be welcome.

Steven Haigh

📧 netwiz@xxxxxxxxx     💻 https://www.crc.id.au
📞 +613 9001 6090       📱 +614 1293 5897




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