Trying to get Gigabit in a Xen DomU... help!

[djBon2112]

My server is running Debian Lenny (2 gigabit NICs), and the DomU is Server 2008 R2 64-bit, HVM virtualized. I'm trying to get a gigabit interface in the DomU (because it's my DC and I need the speed), but I can't figure it out! I keep hearing about this "xenpv" driver package, but I can't find either a debian version, or a raw .rpm download to extract the contained ISO and driver files, and searching directly for the Windows setup executable gives me nothing.

Am I SOL, or has someone actually done this in Lenny?

FTR, here's the network setup:

                       --- eth0 --- Dom0 (fileserver)
(dual Gigabit links) -|
                       --- eth1 --- br0 (Xen bridge) --- DomUs (x3, two Debian Lenny, one Windows Server 2008)