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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

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!

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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