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