RE: [Xen-users] Couple questions

["Liberati, Matthew" <mliberat@xxxxxxx>]

Thanks for the initial response I have a couple of follow-up questions

These questions are about the relationship between the virtual machines

When a message is sent does the receiver know who the sender is?

How many channels are available?

What security options are available and how is spoofing or forging
prevented?

Thanks

-----Original Message-----
From: M.A. Williamson [mailto:maw48@xxxxxxxxxxxxxxxx] On Behalf Of M.A.
Williamson
Sent: Friday, October 07, 2005 1:23 PM
To: Liberati, Matthew
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Couple questions

>What will be the device driver locations in future versions of xen
(i.e.
>version 3.0)?

In dom0, or in dedicated driver domains, as in Xen 2.0. Some more setup 
code (e.g. PCI bus setup and handling) has also been moved into dom0 for

Xen 3.0 - makes it easier to stay compatible with the same hardware as 
native Linux.

>What will be the communications capabilities from virtual machine to
>virtual machine and between the virtual machine and the hypervisor?

For high bandwidth transfers, shared memory communication rings and
event 
channels are used for interdomain communications. For low bandwidth 
messaging and setup communications, a hierarchical "registry" called 
xenstore is used instead of the old style "control messages". The
console 
will now use a separate shared memory page.

Xen <-> domain communication is via hypercalls, events (virtual IRQs)
and 
(occasionally) shared memory.

HTH,
Mark

>I apologize if this is the wrong forum for these types of questions.
>
>Please point me in the right direction if this is the case
>
> 
>
>Thanks,
>
>Matt
>
>



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