On 09/14/2009 07:47 PM, Michael S. Tsirkin wrote:

On Mon, Sep 14, 2009 at 12:08:55PM -0400, Gregory Haskins wrote:
   

quoted

For Ira's example, the addresses would represent a physical address on
the PCI boards, and would follow any kind of relevant rules for
converting a "GPA" to a host accessible address (even if indirectly, via
a dma controller).
     

I don't think limiting addresses to PCI physical addresses will work
well.  From what I rememeber, Ira's x86 can not initiate burst
transactions on PCI, and it's the ppc that initiates all DMA.
   

vhost-net would run on the PPC then.

quoted

quoted

  But we can't let the guest specify physical addresses.
       

Agreed.  Neither your proposal nor mine operate this way afaict.
     

But this seems to be what Ira needs.
   

In Ira's scenario, the "guest" (x86 host) specifies x86 physical 
addresses, and the ppc dmas to them.  It's the virtio model without any 
change.  A normal guest also specifis physical addresses.

-- 
error compiling committee.c: too many arguments to function

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