Hi, Paolo && Stefan:
When I test the dataplane feature with qemu master, I find that Windows (Windows 7 and Windows 2003) VM will hang if dataplane is enabled. But if I try to start a Fedora VM, it can start normally.
The command I boot QEMU is:
x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive
file=win7.img,if=none,id=drive-virtio-disk,format=raw,cache=none,aio=native
-device virtio-blk-pci,config-wce=off,scsi=off,x-data-plane=on,drive=drive-virtio-disk,id=virtio-disk
I found the similar bug has reported some days ago: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html . And a patch for this bug has already committed by Paolo at Mar 13: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html .
But it cannot work under my environment. Could you give me some advise to debug this problem ? I can provide more information if need.
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Best Regards,
Leiqiang Zhang