This should probably go into 3.4.y and 3.5.7.y:
From: Olaf Hering <olaf@xxxxxxxxx>
Date: Tue, 18 Sep 2012 17:48:01 +0200
Subject: ata_piix: reenable MS Virtual PC guests
commit d9904344fc4052fbe7e4dc137eba0dcdadf326bd upstream.
An earlier commit cd006086fa5d91414d8ff9ff2b78fbb593878e3c ("ata_piix:
defer disks to the Hyper-V drivers by default") broke MS Virtual PC
guests. Hyper-V guests and Virtual PC guests have nearly identical DMI
info. As a result the driver does currently ignore the emulated hardware
in Virtual PC guests and defers the handling to hv_blkvsc. Since Virtual
PC does not offer paravirtualized drivers no disks will be found in the
guest.
--
Ben Hutchings
Computers are not intelligent. They only think they are.
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