Nested SVM was unaware of the HVM direct vector eventchn mechanism. 
Attached patch fixes a host crash when starting a KVM L2 guest on a 
pv-on-hvm L1 Linux guest (e.g., HVM Debian Squeeze domU).

Signed-off-by: Uwe Dannowski <Uwe.Dannowski@amd.com>
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

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