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.)
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