Re: [Qemu-devel] Advice on some configuration parameters

[Fabio Fantoni]

Il 12/02/2013 14:05, Fabio Fantoni ha scritto:
> I'm making patches to enable some qemu upstream features in xen that 
> are missing in libxl.
> I'm trying to do it just by giving arguments to qemu, and I want them 
> to be dynamic (e.g. without physical addresses if possible) and concise.
>
> I'm confused about usb configuration.
>
> Looking at what virt-manager does, it seems that you set the 
> usbredirection in channels like this:
> -chardev spicevmc,id=charredir0,name=usbredir -device 
> usb-redir,chardev=charredir0,id=redir0
>
> At the moment I'm defining the physical usb devices like this:
> -readconfig /etc/qemu/ich9-ehci-uhci.cfg
>
> If I try to set up virt-manager so that it doesn't point to a file, it 
> uses this configuration:
>
> -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7
> -device 
> ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5
> -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1
> -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2
>
> This seems to differ from the configuration file, e.g. you have 
> multifunzion=on only on the first uhci, besides I can't understand how 
> many physical ports are defined. I tried setting 9 usbredirection 
> channels in virt-manager but that configuration doesn't change and no 
> errors are reported, but I doubt that physical ports are being define 
> dynamically.
>
> Can you omit physical addresses?
> I searched the web but I can't find detailed informations about it. 
> Can someone explain in detail how you are supposed to configure usb 
> physical ports? I want to enable both usb redirection and usb 
> passthrough in a dynamic and concise manner.
>
> About spice vdagent at the moment I'm using this configuration that 
> seems to work:
> -device virtio-serial -chardev spicevmc,id=vdagent,name=vdagent 
> -device virtserialport,chardev=vdagent,name=com.redhat.spice.0
>
> But I noticed that virt-manager use this slightly different one:
> -chardev pty,id=charserial0 -device 
> isa-serial,chardev=charserial0,id=serial0 -chardev 
> spicevmc,id=charchannel0,name=vdagent -device 
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
>
> Are there any problem with the more concise one I'm using?
>
> Thanks for any reply.
Are there someone can help me please?

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