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

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

>-----Original Message-----
>From: Isaku Yamahata [mailto:yamahata@xxxxxxxxxxxxx]
>Sent: 2007年5月11日 10:33
>To: Xu, Anthony
>Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>Subject: Re: [Xen-ia64-devel] VTD is coming
>
>
>Do you mean nexted page table(NPT) by 'processor page table'?
Processor page table refers to shadow page table which is used to emulate guest 
page table, this is not related to NPT.

>ia32 VT-d code would be very specific to ia32 so that
>it seems very difficult to have arch generic code.
>It would be reasonable to go for ia64 specific VT-d implementation.

Yes, we need to prepare for VTD/IPF,
I think the first step is to change P2M to vtd page table format.
P2M is related to several components inside XEN, it might take a while,
It is better, if this can be done earlier.

Then we can leverage code from IA32 as possible, after vtd/ia32 code is checked 
in. I think we can reuse most of the code, especially the codes in qemu and 
control
panel.

Finally, we can debug vtd code when VTD/IPF platform is present.

Thanks,
Anthony

>
>--
>yamahata

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