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[Xen-users] xen does not work with amd64 kernel but works with 686

I have problems running Xen (from Debian 7, i386 userspace) on Asus P3-AE5 
system (M2V-TVM board) with Athlon 64 3000+ CPU (AM2, 1.8GHz).
In short, Xen is not accessible from amd64 Linux kernels but works fine with 
686 kernels.

Long version:
xen-system-i386 (4.1.4-3+deb7u1) works fine with linux-image-3.2.0-4-686-pae

xen-system-amd64 (4.1.4-3+deb7u1) works fine with linux-image-3.2.0-4-686-pae 
or linux-image-3.10-0.bpo.2-686-pae

The same Xen does NOT work with linux-image-3.2.0-4-amd64 or 
linux-image-3.10-0.bpo.2-amd64. Debian starts fine but the boot process 
stalls with:

[....] Starting Xen daemons: xenfs xenstoredFATAL: Failed to initialize dom0 
state: Inappropriate ioctl for device
INFO: task xenstore-write:2696 blocked for more than 120 seconds.

xm then does not work.

Is this a bug (in Xen, Linux or BIOS?) or a configuration problem (amd64 
kernels with i386 userspace)?

Ondrej Zary

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