Hi!
quoted
use hv_storvsc instead of ata_piix to handle the IDE disks devices ( but not for the CD-ROM)
Please, backport to 3.4.1-stable all related this:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=59d0952b43552570e0f1c3ff91ebb16d4caec171
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days ago Linus Torvalds Merge tag 'upstream-linus' of git://git.kernel.org...
...Ugly MSFT Hyper-V workaround in ata_piix
ata_piix: defer disks to the Hyper-V drivers...
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i.e.
http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=patch;h=db63a4c8115a0bb904496e1cdd3e7488e68b0d06
===From db63a4c8115a0bb904496e1cdd3e7488e68b0d06 Mon Sep 17 00:00:00 2001
From: Andy Whitcroft <apw@canonical.com>
Date: Fri, 4 May 2012 22:15:10 +0100
Subject: [PATCH] libata: add a host flag to ignore detected ATA devices
. . .
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and
http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commitdiff_plain;h=cd006086fa5d91414d8ff9ff2b78fbb593878e3c;hp=db63a4c8115a0bb904496e1cdd3e7488e68b0d06
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From: Andy Whitcroft <apw@canonical.com>
Date: Fri, 4 May 2012 21:15:11 +0000 (+0100)
Subject: ata_piix: defer disks to the Hyper-V drivers by default
. . .
==
Best regards, Victor Miasnikov
Blog: http://vvm.blog.tut.by/