> Opensolaris works perfectly, but I am not able to
> boot the xvm kernel on this hardware.
> I added the -k option in grub, but the system hangs
> before the hostname line without any debug info.

Try it with the "-v" option, that should enable verbose
kernel messages.  You can also combine that with "-k",
as "-kv".

Or start the kernel with the kernel variable moddebug set
to 80000000, to get debug messages for each module
loaded.  See

  http://blogs.sun.com/dmick/entry/diagnosing_kernel_hangs_panics_with

Boot with options "-kdv", and in kmdb:

    moddebug/W 80000000
    :c


> I've tried snv from b94 to b99, with the same results.

Just a wild guess: I do remember that I got such a hang
with the xvm kernel on a Tecra S1 laptop.  On that laptop
switching into acpi mode has the side effect of stopping the 
the legacy pit timer.  There was already a workaround available
in the xvm hypervisor to fix such a problem; it is enabled by
passing option "correct_pit" to the hypervisor, like this:

   kernel$ /boot/$ISADIR/xen.gz correct_pit
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