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Re: [Xen-users] Multi headed, Multi user partially virtualized environment - feasible?

  • To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: Andreas <register090711c@xxxxxxxxx>
  • Date: Sun, 10 Jul 2011 02:57:31 -0700 (PDT)
  • Delivery-date: Sun, 10 Jul 2011 02:58:59 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

>> AFAIK a normal PC can only accept input from one keyboard and one mouse at a 
>> time. So your biggest challenge would be to figure out 

>> how to bind a mouse and keyboard to one specific VM, then another keyboard & 
>> mouse to another VM.
>> One would normally use a dumb terminal for each user who needs to connect in 
>> this case, so I'm not sure if what you want todo would be 

>> possible with today's hardware.

>There's no such hardware restriction, and never really has been AFAIK. Even 
>back when PS2 (and older) keyboards were in use, there wasn't 

>(to my knowledge) any fundamental restriction that would have prevented 
>multiple interfaces being supported. Now it's all USB it's moot 

>anyway >- you can add something like 60 keyboards and mice (limit is 127 
>devices total IIRC).
>The real problem is, as you say, in software/OS support to route devices to 

Its possible to setup a linux box to use serveral independent screens and 
keybords/mice so serveral people can work on it (google for "linux multi 
seat"). Thats what i assumed as a base for my project. I don't know if you can 
assign whole USB hubs this way, though.
So, if i just configure the "zero clients" as simple linux desktops, it should 
work for the most part, although i don't know if assigning a DVI port to a 
session can be done "on the fly".
-> Linux can handle and map multiple inputs

Problem is the xen part - running an emulated unaccelerated windows in 
virtualbox via x should work with this setup, but with slow graphics.
So i want to run that in xen, but don't know how what possibilities for 
hardware mapping xen offers. 

I assume Dom0 would manage the screens?
Can i assign a "half graphic card" (1 DVI port) to a DomU or would i need a 
seperate card per session/VM?


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