[win-pv-devel] How to diagnose windows domU hang on boot?

["G.R." <firemeteor@xxxxxxxxxxxxxxxxxxxxx>]

Hi all,

I have a windows 7 domU get stuck in the boot screen forever after a recent driver update.

I'm a user of community version of XEN.
The old driver I have being using for a long time is the GPL PV driver from James Harper.
This driver update is part of the migration from XEN 4.3.2 to XEN 4.8.0.

I'm not sure if this driver update would do me any good, but it does get into trouble in a different setup as mentioned here:
https://lists.xen.org/archives/html/xen-users/2017-01/msg00080.html

So basically I'm reporting two different boot hang issues here:

1. The upgraded driver version (V8.1) causes issue in the original domU config.

2. The old GPL PV driver version causes issue in an experimental storage driver domain + stubdom config.

In both cases the syndrome look exactly the same -- win 7 domU boots into the windows logo on black screen and never make progress further.

But it does not BSOD either.
Could anybody suggest a way to diagnose further to help me understand what's going on in behind?

Thanks,

G.R.

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