Re: [Xen-devel] Discussion about virtual iommu support for Xen guest

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Paul Durrant [mailto:Paul.Durrant@xxxxxxxxxx]
> Sent: Friday, May 27, 2016 4:47 PM
> > >
> > > A whole lot of this would be easier to reason about if/when we get a
> > > basic root port implementation in Xen, which is necessary for HVMLite,
> > > and which will make the interaction with qemu rather more clean.  It is
> > > probably worth coordinating work in this area.
> >
> > Would it make Xen too complex? Qemu also has its own root port
> > implementation, and then you need some tricks within Qemu to not
> > use its own root port but instead registering to Xen root port. Why is
> > such movement more clean?
> >
> 
> Upstream QEMU already registers PCI BDFs with Xen, and Xen already handles 
> cf8 and cfc
> accesses (to turn them into single config space read/write ioreqs). So, it 
> really isn't much
> of a leap to put the root port implementation in Xen.
> 
>   Paul
> 

Thanks for your information. I didn't realize that fact.

Curious is there anyone already working on a basic root port support
in Xen? If yes, what's the current progress?

Thanks
Kevin
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