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Description
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With the fix for 6670693, the xpv driver is now dependent on the compat interfaces new with xen 3.1. The compat interfaces change the way an HVM domU talks to the hypervisor, depending on whether the host is 32-bit or 64-bit. Previously, in xen 3.0, the HVM domain needed to be aware of the host; whether it was dealing with a 32-bit or a 64-bit dom0, and change its behavior accordingly.
While in theory it would be possible to write a driver that adapted its behavior depending on the version of xen it found, it's not worth it for us to expand our testing matrix to accomodate such a scenario. So we will bar the xpv driver from attaching on anything less than xen 3.1.
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