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Description of problem:
As mentioned in :https://bugzilla.redhat.com/show_bug.cgi?id=602607#c18,
create this bug to track the issue on virtio-win side.

This issue often happens when testing "NDIS Test6.0" or "NDIS test 6.5", guest hangs and cannot quit from qemu monitor. There's a lot of message like:

virtio_ioport_write: unexpected address 0x13 value 0x0
virtio_ioport_write: unexpected address 0x13 value 0x0
virtio_ioport_write: unexpected address 0x13 value 0x0
virtio_ioport_write: unexpected address 0x13 value 0x0
virtio_ioport_write: unexpected address 0x13 value 0x0
virtio_ioport_write: unexpected address 0x13 value 0x0
virtio_ioport_write: unexpected address 0x13 value 0x0



Version-Release number of selected component (if applicable):
virtio-win-1.1.7-2
qemu-kvm-0.12.1.2-2.90.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
1.Boot a windows guest and test virtio-net driver, run jobs "NDIS Test6.0" or "NDIS test 6.5"
2.
3.
  
Actual results:
Guest hangs and got lots of "virtio_ioport_write" message.

Expected results:
Test pass.

Additional info:

Those printout are by design in virtio.

They are part of the debug mechanism in the guest driver that indicates loss (stuck) transfer on QEMU side. 

We will write 0 to VIRTIO_PCI_ISR in case of stuck transfer and "1" in case of blue screen.

The real issue here is the stuck transfer (packers submitted to QEMU but no indication received back).