Re: [Xen-devel] error when pass through device to guest with qemu-xen-dir-remote

["Zhou, Chao" <chao.zhou@xxxxxxxxx>]

I rebuild the upstream QEMU according to the wiki, but device static assignment 
doesn't work, no lspci output in guest. However hotplug & unplug works fine.

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxx] 
On Behalf Of Ian Campbell
Sent: Friday, August 03, 2012 6:36 PM
To: Stefano Stabellini
Cc: Zhang, Yang Z; Anthony Perard; xen-devel
Subject: Re: [Xen-devel] error when pass through device to guest with 
qemu-xen-dir-remote

On Fri, 2012-08-03 at 11:29 +0100, Stefano Stabellini wrote:
> On Fri, 3 Aug 2012, Zhang, Yang Z wrote:
> > When create guest with device assigned, it shows the error and the device 
> > wasn't able to work inside guest:
> > libxl: error: libxl_qmp.c:288:qmp_handle_error_response: received an 
> > error message from QMP server: Parameter 'driver' expects a driver 
> > name
> > 
> > It only fails with qemu-xen-dir-remote(Is this tree more close to upstream 
> > qemu?). I don't see the error with the traditional Qemu.
> > I also tried qemu-upstream, but it fails when I try to enable pci 
> > pass-through for xen. I think Anthony's patch to add pci pass-through 
> > support for Xen is accepted by qemu-upstream, am I right?
> 
> Yes, it was accepted, but it is present only in upstream QEMU (from 
> git://git.qemu.org/qemu.git), not the tree we are currently using in 
> xen-unstable for development 
> (git://xenbits.xensource.com/qemu-upstream-unstable.git).
> Make sure you are using the right tree!

http://wiki.xen.org/wiki/QEMU_Upstream has some notes on how to use the 
upstream qemu tree instead of our stable branch of upstream.

> 
> Anthony is currently on vacation and is going to be back in about a 
> week.
> 
> > Another question:
> > Now I am trying to add some features (relevant to pass through device) to 
> > Qemu, which tree should I use? Since traditional qemu is great different 
> > from qemu-upstream, it is too old to develop patch base on it. But besides 
> > the old one, I cannot find a working qemu.
> 
> You should use upstream QEMU, I am going to rebase our tree on that 
> early on in the 4.3 release cycle.



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