RE: [Xen-ia64-devel] VTD is coming

["Xu, Anthony" <anthony.xu@xxxxxxxxx>]

>From: Akio Takebe [mailto:takebe_akio@xxxxxxxxxxxxxx]
>Sent: 2007年5月11日 11:58
>To: Xu, Anthony; Isaku Yamahata
>Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx; Akio Takebe
>Subject: RE: [Xen-ia64-devel] VTD is coming
>
>Another question, xen don't know dma pages used by guest,
>how about can xen protect the dma pages?
>(Sorry, I'll read VTd spec much more.)
>
Per VTD spec, there is a vtd page table for every device.
If two devices belong to a domain, they can share a vtd page table.
Xen doesn't need to protect the dma pages, which are already protected
by different VTD page table.

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