RE: [Xen-devel] RFC -- virtualisable NIC support in Xen

["Caitlin Bestler" <caitlinb@xxxxxxxxxxxx>]

> -----Original Message-----
> From: Greg Law [mailto:glaw@xxxxxxxxxxxxxx] 
> Sent: Friday, September 22, 2006 4:05 AM
> To: Caitlin Bestler
> Cc: xen@xxxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] RFC -- virtualisable NIC support in Xen
> 
> Caitlin Bestler wrote:
> > When the App/DomU posts a buffer (for TX or RX), what 
> address does it 
> > use, and how does the hardware understand it?
> 
> It uses a "buffer address".  This is essentially an index 
> into a "buffer-table" which is stored on the NIC.  This table 
> is used to lookup physical addresses that the NIC will DMA to/from.
> 
> The buffer-table is programmed from Dom0.
> 
> The buffer-table is effectively our IOMMU/page-tables.
> 

Over what scope is the buffer handle unique?


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel