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Re: [Qemu-devel] [PATCH v3 2/2] intel-iommu: extend VTD emulation to all


From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH v3 2/2] intel-iommu: extend VTD emulation to allow 57-bit IOVA address width.
Date: Fri, 21 Dec 2018 12:15:26 -0500

On Sat, Dec 22, 2018 at 12:19:20AM +0800, Yu Zhang wrote:
> > I'd like to avoid poking at the CPU from VTD code. That's all.
> 
> OK. So for the short term´╝îhow about I remove the check of host cpu, and add a 
> TODO
> in the comments in vtd_decide_config()? 

My question would be what happens on an incorrect use?
And how does user figure out which values to set?

> As to the check against hardware IOMMU, Peter once had a proposal in
> http://lists.nongnu.org/archive/html/qemu-devel/2018-11/msg02281.html
> 
> Do you have any comment or suggestion on Peter's proposal?

Sounds reasonable to me. Do we do it on vfio attach or unconditionally?


> I still do not quite know
> how to do it for now...
> 
> [...]
> 
> 
> B.R.
> Yu



-- 
MST



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