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I have an odd problem, but, easy to replicate.

Xen 3.4 + GPLPV + Windows 2003 (x32) guest.  I've tried this on both GPLPV
0.10.0.138 and 0.10.0.142 drivers.

If the hard drive is an image file using the file: directive in the xen config file, Windows 2003 guest boots and runs great with the GPLPV drivers.

If the hard drive is a physical drive or partition using the phy: directive in the xen config file, Windows 2003 guest boots and runs fine with the QEMU drivers.

If the hard drive is a physical drive or partition using the phy: directive in the xen config gile, Windows 2003 guest boots and runs with the GPLPV drivers for about 3-5 minutes. At the time, the entire machine locks up and I have to power cycle machine to recover (no mouse, or keyboard response).

I even took the crashed Windows 2003 partition, dd copied to a file,
setup xen to point to the image file using the file: directive.  The Windows
2003 guest came up with the GPLPV drivers and ran great.

Reproducible: Always

Steps to Reproduce:
1. Run Xen
2. Load Windows 2003 guest as phy: device.
3. Load GPLPV 0.10.0.142 drivers on Windows guest.
4. Reboot Windows guest.
5. Do some disk activities in Windows 2003 (like error checking or defragment).
6. After 3-5 minutes, the Xen and entire computer locks up.
Actual Results:  
The computer locked up.

Expected Results:  
The computer should run without locking up.