Re: [Xen-devel] Xen Q35 & virtual VTD support

["Lan, Tianyu" <tianyu.lan@xxxxxxxxx>]

On 5/10/2016 6:11 PM, Stefano Stabellini wrote:
> Hello Tianyu,
>
> I am CC'ing Anthony who should have a better idea about this. Also
> please use my kernel.org email address for future correspondence.
OK. I get it.

> What do you mean by reusing Q35 for Xen? If you mean using QEMU to
> emulate a Q35 based machine for HVM guests, I think that should be OK.
From xl code, I findit passes pc, xenpv or xenfv as "-machine" param
to Qemu except Q35. I also tried changing code to select Q35 in the xl
but guest didn't boot up. So I want to check whether Xen supports Q35 in
the current code or not.

If yes, we can reuse Qemu virtual VTD for Xen with minor changes.


> Thanks,
>
> Stefano
>
>
> On Mon, 9 May 2016, Lan, Tianyu wrote:
> > Hi All: 
> > We are researching how to add virtual VTD support for Xen HVM
> > guest. Current qemu has a basic virtual VTD support for Q35. I'd like to
> > confirm whether Xen supports Q35 or not. Can we reuse it for Xen? Thanks.
> >
> > The motivations of adding virtual VTD support for Xen prepare for
> > 1) Shared Virtual Memory (SVM)
> > 2) Increase max VCPUs > 255 (The feature relies on virtual VTD irq
> > remapping function.)
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
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