Re: [Qemu-devel] VFIO based vGPU(was Re: [Announcement] 2015-Q3 release of XenGT - a Mediated ...)

[Tian, Kevin]

> From: Alex Williamson
> Sent: Wednesday, January 27, 2016 12:13 AM
> > b) adding other information. For example, for the OpRegion, QEMU need
> > to do more than mmap a region, it has to:
> >
> >     - allocate a region
> >     - copy contents from somewhere in host to that region
> >     - mmap it to guest
> >
> >
> > I remember you already have a prototype for this?
> 
> Yes, I'm working on this currently, it will by a device specific region
> and QEMU can either copy the contents to a new buffer in guest memory
> or provided trapped access to the host opregion.  I thought vgpus
> weren't going to need opregions though, I figured it was more for GVT-d
> support.  Thanks,
> 

It's beneficial to vgpu too. Anyway same graphics driver runs inside VM
for both cases, so any driver assumption on passthru also applies to vgpu.

Thanks
Kevin