Re: Need advice to develop some libxl patches

[Fabio Fantoni <fantonifabio@tiscali.it>]

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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?
On qemu-devel they are saying that setting the environment variable for 
the audio driver is not necessary because the spice audio driver is used 
by default if spice is turned on.
I also see that audio is already implemented on libxl, it is a basic 
implementation without sanity check but working.
Tried soundhw="hda" and is working, also with spice.

>
>>> 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).
>
> Ian.
>


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