Virtio and LVM

I'm trying to get a Fedora 9 Beta guest to use the virtio block device. I've included virtio_blk and virtio_pci in the initrd on the guest and when booting virtio_blk detects vda1 and vda2 correctly but when the system tries to find the volume groups it doesn't find any. Is there something special that needs to be done to get the kernel to detect the volume group on vda2?

Regards,
Dennis

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