Re: [Xen-devel] VMX device models not getting created anymore?

[Mike Wray <mike.wray@xxxxxx>]

Arun Sharma wrote:
> Mike Wray wrote:
>
> > > However, if I subtract -1, everything magically works :)
> >
> > Having to add or subtract 1 to make something work is almost always
> > not the right way to fix a problem - because it dosen't address
> > the real issue.
> You probably missed the smiley :)
>
> > > I think the quick fix is to redefine IOPACKET_PORT to be 3. Will send 
> > > a patch to remove the hard coding ASAP.
> >
> > That's not the fix. That just replaces one hard-coded constant with 
> > another, when
> > it shouldn't be hard-coded at all. It's going to break again if any 
> > other interdomain
> > port is allocated.
> >
> > The port to use should be passed to the domain as a parameter.
> > This is what is done with the domain controller port,
> > and the xenstore port.
> Yes of course, I promised to send a patch as well. The quick fix was for 
> those who couldn't wait.
> > The correct fix is to add the device model port as a parameter to
> > xc_vmx_build. In fact this already has control_evtchn as a parameter,
> > but ignores it - so you could use that. You could probably re-use
> > the start_info field for it too as vmx domains don't seem to be using
> > the control channel otherwise:
> The problem is that:
>
> self.construct_image()
>     ...
>         xc_vmx_build()
> self.configure()
>     ...
>         self.image.createDeviceModel()
>
> The event channel hasn't been created at the time of xc_vmx_build().
All the other build fns need the channel, so it is created before the domain 
image:

    def construct_image(self):
        """Construct the boot image for the domain.
        """
        self.create_channel()
        self.image.createImage()
        self.exportToDB()
        self.storeConnect()

From the linux build image:

    def buildDomain(self):
        control_evtchn = self.vm.channel.getRemotePort()
        ...
        d  = xc.linux_build(dom            = self.vm.getDomain(),
                            image          = self.kernel,
                            control_evtchn = control_evtchn,
                            store_evtchn   = store_evtchn,
                            cmdline        = self.cmdline,
                            ramdisk        = self.ramdisk,
                            flags          = self.flags,
                            vcpus          = self.vm.vcpus)
        ...

Mike

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