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

[Mike Wray <mike.wray@xxxxxx>]

Arun Sharma wrote:
> Mike Wray wrote:
>
> > Compared to which field is it off by 1?
> > The VMX code creates its own event channel using  
> > channel.eventChannel(), which will
> > allocate new ports. Possibly it should be reusing the existing control 
> > channel port
> > instead? This might account for the off-by-one as ports are allocated 
> > sequentially.
>
> That seems to be the problem. If I add some logging, I see:
>
> [2005-06-17 12:06:07 xend] INFO (channel:32) created event channel: 
> <EventChannel dom1:0:19 dom2:5:2>
> [2005-06-17 12:06:07 xend] INFO (channel:32) created event channel: 
> <EventChannel dom1:0:20 dom2:5:3>
> The first one is created here:
>
> File "/usr/lib/python/xen/xend/XendDomain.py", line 276, in domain_create
>     dominfo = XendDomainInfo.create(self.dbmap, config)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 159, in create
>     vm.construct(config)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 501, in construct
>     self.construct_image()
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 547, in 
> construct_image
>     self.create_channel()
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 680, in 
> create_channel
>     self.store_channel = self.eventChannel("store_channel")
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 674, in 
> eventChannel
>     return EventChannel.restoreFromDB(db, 0, self.id)
>   File "/usr/lib/python/xen/xend/server/channel.py", line 59, in 
> restoreFromDB
>     evtchn = cls.interdomain(dom1, dom2, port1=port1, port2=port2)
>
> The second is created here:
>
> File "/usr/lib/python/xen/xend/XendDomain.py", line 276, in domain_create
>     dominfo = XendDomainInfo.create(self.dbmap, config)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 159, in create
>     vm.construct(config)
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 502, in construct
>     self.configure()
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 884, in configure
>     self.create_devices()
>   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 704, in 
> create_devices
>     self.image.createDeviceModel()
>   File "/usr/lib/python/xen/xend/image.py", line 300, in createDeviceModel
>     self.device_channel = channel.eventChannel(0, self.vm.getDomain())
>   File "/usr/lib/python/xen/xend/server/channel.py", line 116, in 
> eventChannel
>     return EventChannel.interdomain(dom1, dom2, port1=port1, port2=port2)
>
> Things get more interesting, because self.device_channel['port1'] for 
> the second channel returns 19 instead of 20.
> Are there assumptions in the code that there must be only one 
> interdomain event channel between two domains?
It depends which code you are talking about.
The code using the domain control channel (i.e. the frontend and backend 
drivers)
gets upset if you don't use the first event channel on the domain.
Other code will use any interdomin channel, but you need to tell it the
port number somehow.

Mike


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