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

[Fabio Fantoni]

Il 03/03/2013 11:27, Alon Levy ha scritto:

Il 01/03/2013 13:45, Paolo Bonzini ha scritto:

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.

They should use physical addresses, otherwise changing the VM
hardware
in trivial ways may cause a waterfall effect and cause Windows to
reactivate.

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

That doesn't matter.

, besides I can't understand how many physical ports are defined.

There are 6 ports, controlled by either the EHCI for USB 2.0
devices
(the EHCI controls 6 ports) or by one of the three UHCI for USB 1.1
ports (one UHCI has 2 ports).

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.

QEMU creates hubs automatically I think in that case.

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?

It is the same.

Paolo

Thanks for reply.
I have another questions:
What exactly does the -usb parameter that seems to be necessary for
usb
passthrough?

It is shorthand for the appropriate "-device" to create the usb host (i.e. uhci 
etc.)

Thanks for the reply, I tried -usb and it seems to create an usb1 controller with 2 ports and not an enhanced usb2 with 6 ports.

I mean usb devices passed through host (with -usbdevice).
Is the number of such passthrough usb devices limiting the number of
available channel for usb redirection devices?

AFAIR yes.

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