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Re: [Xen-devel] myrinet dma

To: Tim Freeman <tfreeman@xxxxxxxxxxx>
Subject: Re: [Xen-devel] myrinet dma
From: Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>
Date: Thu, 26 Aug 2004 00:05:56 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx, Mark.Williamson@xxxxxxxxxxxx
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In-reply-to: Message from Tim Freeman <tfreeman@xxxxxxxxxxx> of "Wed, 25 Aug 2004 14:45:57 CDT." <20040825144557.46c6a968@prana-bindu>
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What exactly is the "port" thing that the card returns?  Is it the channel 
that the client uses to talk to the card (with the number of clients therefore 
being limited by the number of ports)?

Having multiple domains with hardware privileges to configure the card would 
not work.  The proper way to do things would be as Ian described with one 
privileged kernel agent in dom0 that configures the hardware.

If you really need a workaround, you could always put one card per domain into 
the machine and give them each privileges to access their respective card.  
Obviously, this is overkill ;-) but it should be a quick fix.  Note that if 
domains have hardware privileges then you shouldn't give them to any 
potentially malicious users!


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