Re: [Xen-devel] Need advice to develop some libxl patches

[Fabio Fantoni <fantonifabio@xxxxxxxxxx>]

Il 08/02/2013 12:50, Ian Campbell ha scritto:
> On Fri, 2013-02-08 at 11:36 +0000, Stefano Stabellini wrote:
> > On Thu, 31 Jan 2013, Fabio Fantoni wrote:
> > > I tested spice vdagent, spice audio and spice usbredirection with qemu
> > > upstream and xen-unstable manually, is all working.
> > > I'm start to write some patches to have all spice features on xen 4.3.
> > >
> > > About vdagent probably no problem.
> > >
> > > About spice audio on test I actually set this variable manually:
> > >
> > > export QEMU_AUDIO_DRV=spice
> > >
> > > I need know how to setup this env variable but for a given hvm domU start.
> > > In other word I need to set this env variable on a per domU basis (if
> > > spiceaudio if setted in cfg).
> > Pass it from libxl, after all QEMU is spawned by libxl
> Setting envvars to configure qemu is a pretty crappy interface though,
> given that qemu supports both command line and configuration files for
> most other stuff. Perhaps this interface should be fixed upstream to use
> the standard mechanisms first?
> > > About usb redirection the qemu parameters to add are similar to this:
> > >
> > > device_model_args=["-readconfig","/etc/xen/ich9-ehci-uhci.cfg","-chardev","spicevmc,name=usbredir,id=usbredirchardev1","-device","usb-redir,chardev=usbredirchardev1,id=usbredirdev1,bus=ehci.0,debug=3","-chardev","spicevmc,name=usbredir,id=usbredirchardev2","-device","usb-redir,chardev=usbredirchardev2,id=usbredirdev2,bus=ehci.0,debug=3","-chardev","spicevmc,name=usbredir,id=usbredirchardev3","-device","usb-redir,chardev=usbredirchardev3,id=usbredirdev3,bus=ehci.0,debug=3"]
> > >
> > > Probably is not good point to external generic file (on my test
> > > /etc/xen/ich9-ehci-uhci.cfg), someone can tell me the best way for do this?
> What does /etc/xen/ich9-ehci-uhci.cfg contain? Perhaps we might want to
> add USB passthrough as a concept in libxl so as to expose this in a more
> "libxl" like manner, instead of just cutting through the qemu options?
> (I think George also brought this up a while back).
The content is here:
http://xenbits.xen.org/gitweb/?p=qemu-upstream-unstable.git;a=blob_plain;f=docs/ich9-ehci-uhci.cfg;hb=HEAD

Spice usbredir redirects USB devices from client (where spice-client is 
launched) to qemu, not from dom0 to qemu.
How to expose it in a more "libxl" like manner?

> Ian.

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