[Xen-devel] QCOW2 goes corrupted when using GPLPV drivers

[Fernando Luiz Chaves Xavier Matos <fernando@xxxxxxxxxxxxxx>]

QCOW2 disk image gets corrupted when you try to install Service Pack 1
AFTER installing GPLPV drivers.

This means, without the pv drivers, everything works fine.

I tested both RAW and QCOW2 without GPLPV drivers and the installation
has completed without any error, and the image (at least qcow2) has no
errors too.

How to reproduce:
- Install Windows 7 32-bit guest
- Check the image with "qemu-img check -f qcow2 -r all" to ensure that
there still no problems.
- Install GPLPV drivers 0.11.0.356
- Try to install Service Pack 1
- Get an "unknown error" from the installer
- Check the qcow2 image with "qemu-img check -f qcow2 -r all" and gets
TONS of integrity errors.

guest config:

name = "win7"
builder = "hvm"
vcpus = 1
memory = 1536
acpi = 1
apic = 1
hap =  0
viridian = 1
localtime = 1
stdvga = 0
sdl = 0
vnc = 1
vncconsole = 1
vnclisten =  "0.0.0.0"
vncdisplay = 2
usbdevice = "tablet"
keymap = "pt-br"
disk = [ 'tap2:aio:../ISO/WIN7_AIO_X86_X64.iso,hdb:cdrom,r' ,
'tap2:qcow2:./win7.qcow2,hda,w' ]
boot = "dc"
vif = [ 'mac=00:16:3E:31:C4:D5,bridge=xenbr0' ]
on_crash =  "restart"
on_reboot =  "restart"
on_poweroff = "destroy"

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