Re: [Xen-users] Usage of pci-attach

[Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx>]

Asim wrote:
> I could nail down my problem to the xen-store entry for the event
> channel not being created.  Once I issue: -
>
> xenstore-write /local/domain/17/device/pci/0/event-channel 6
>
> The PCI device shows up in my domU. Also, after this the network takes
> quite a while to become active (sometimes its really soon). So,
>
> 1. How do I fix the above problem that I dont have to issue a manual store?
I have never experienced this kind of problem. pcifront is responsible
for writing event-channel node in xenstore, so something might be wrong
with your domU kernel config or build?

> 2. Is there a poll that goes on here to check for backend changes -
> can I force it in code so that my network becomes accessible real
> soon?
I'm not sure what 'network' means, but presume that you want to attach a
physical NIC to a domain and activate it right away. Perphaps you can do
that by setting up udev/hotplug scripts inside the domU, but I don't
know the details.

Thanks,
-- Yosuke

> Regards,
> Asim
>
> On 9/3/08, Yosuke Iwamatsu <y-iwamatsu@xxxxxxxxxxxxx> wrote:
> > Hi,
> >
> > Asim wrote:
> > > Hi,
> > >
> > > Can anyone tell me if I'm using the pci-attach and detach correctly? I
> > > am running Xen which has been built with CONFIG_XEN_BACKEND_PASS
> > > enabled. When I issue the below command to test the hot plug feature
> > > :-
> > >
> > > Device is attached :-
> > >
> > > [root@adsl-01 ~]# xm pci-attach 20 01:0a.0
> > > Error: Device 0000:01:0a.00 is already connected.
> > > Usage: xm pci-attach <Domain> <PciDev>
> > >
> > > Create a new pass-through pci device.
> > This shows the pci device 01:0a.0 was already attached to your domain.
> >
> > > Device is detached:-
> > > [root@adsl-01 ~]# xm pci-detach 20 01:0a.0
> > >
> > > uh?what happenned?
> > If you got no error message here, you had successfully removed the pci
> > device from your domain. To check if the device is really hot-removed,
> > execute 'lspci' command inside domain 20 before and after pci-detach
> > and compare the results.
> >
> > > [root@adsl-01 ~]# xm pci-attach 20 01:0a.0
> > > Error: Device 0 not connected
> > > Usage: xm pci-attach <Domain> <PciDev>
> > >
> > > Create a new pass-through pci device.
> > pci-attach was failed for some reason here. The information of xend.log,
> > dmesg in domu, dmesg in dom0 and the result of 'xenstore-ls -f' would
> > help us investigating the problem further.
> >
> > Regards,
> > -- Yosuke
> >
> > > Am I using this correctly? If any one has used it successfully - kindly
> > > help me.
> > >
> > > Regards,
> > > Asim
> > >
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-users
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