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Date: Wed, 27 Mar 2013 16:41:49 +0100
From: Stefan Hajnoczi <stefanha@gmail.com>
Message-ID: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com>
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Subject: Re: [Qemu-devel] dataplane bug: fail to start Windows VM with
 dataplane enable
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To: =?utf-8?B?5byg56OK5by6?= <leiqzhang@gmail.com>
Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com

On Tue, Mar 26, 2013 at 11:10:35PM +0800, 张磊强 wrote:
> 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.

I sent a fix and CCed you on the patch.  Please test it if you have
time.

Stefan