Re: [Xen-users] communication between dom0 and domu

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Arijit Ganguly wrote:

> All, 
> Is there any way we can set up a communication channel (not a TCP/IP
> based network) between domain0 and unprivileged domains. This can be
> useful in a way that we can write automatic configuration mechanisms
> for our unprivileged VMs.
>  
If you look either at the testsuite I wrote for the console daemon 
(tools/console/testsuite in unstable) or in Dan's xm-test 
(http://static.danplanet.com/xm-test/xm-test-0.1.0.tar.gz), you'll see 
we've both implemented very similiar protocols that allow commands to be 
executed over a domU's console from dom0.
The natural extension of this (when we get multiple console support) is 
to dedicate a console channel to something like this that would give you 
precisely what you'd want.
Actually, if I were you, I'd just set up a dummy nic that wasn't routed 
outside of dom0 and have ssh bind to only that interface in domU.  It's 
a bit heavier weight but it gets the job done (in a very robust way).
Regards,

Anthony Liguori

> Illustration:
> I have a domainU running on a host, which doesn;t have network
> connectivity (like ssh). I just use the VM as a environment I can
> issue commands and get results.  Ports on domain0 are blocked
> preventing me from accessing the VM console. I do not have an account
> in domain0 for security.
> What can be done is running a truested software on domain0, which
> takes commands and runs them inside domainU and returns me the
> results.
>
> The bottomline is a communication channel between dom0 and domU. Any ideas?
>
> Arijit
>
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>
>  

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