Re: [Qemu-devel] [RFC PATCH 0/5] VFIO-NG group/device/iommu framework

[Alex Williamson <alex.williamson@redhat.com>]

On Wed, 2011-09-07 at 13:58 +0200, Alexander Graf wrote:
> On 01.09.2011, at 21:50, Alex Williamson wrote:
> 
> > Trying to move beyond talking about how VFIO should work to
> > re-writing the code.  This is pre-alpha, known broken, will
> > probably crash your system but it illustrates some of how
> > I see groups, devices, and iommus interacting.  This is just
> > the framework, no code to actually support user space drivers
> > or device assignment yet.
> > 
> > The iommu portions are still using the "FIXME" PCI specific
> > hooks.  Once Joerg gets some buy-in on his bus specific iommu
> > patches, we can move to that.
> > 
> > The group management is more complicated than I'd like and
> > you can get groups into a bad state by killing the test program
> > with devices/iommus open.  The locking is overly simplistic.
> > But, it's a start.  Please make constructive comments and
> > suggestions.  Patches based on v3.0.  Thanks,
> 
> Looks pretty reasonable to me so far, but I guess we only know for sure once we have non-PCI implemented and working with this scheme as well.
> Btw I couldn't find the PCI BAR regions mmaps and general config space exposure. Where has that gone?

I ripped it out for now just to work on the group/device/iommu
framework.  I didn't see a need to make a functional RFC just to get
some buy-in on the framework.  Thanks,

Alex