Re: [Qemu-devel] [PATCHv3 1/7] vfio: Start improving VFIO/EEH interface

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

On Wed, 9 Mar 2016 11:56:57 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> On Tue, Mar 08, 2016 at 11:33:45AM -0700, Alex Williamson wrote:
> > On Tue,  8 Mar 2016 13:10:23 +1100
> > David Gibson <david@gibson.dropbear.id.au> wrote:
> >   
> > > At present the code handling IBM's Enhanced Error Handling (EEH) interface
> > > on VFIO devices operates by bypassing the usual VFIO logic with
> > > vfio_container_ioctl().  That's a poorly designed interface with unclear
> > > semantics about exactly what can be operated on.
> > > 
> > > In particular it operates on a single vfio container internally (hence the
> > > name), but takes an address space and group id, from which it deduces the
> > > container in a rather roundabout way.  groupids are something that code
> > > outside vfio shouldn't even be aware of.
> > > 
> > > This patch creates new interfaces for EEH operations.  Internally we
> > > have vfio_eeh_container_op() which takes a VFIOContainer object
> > > directly.  For external use we have vfio_eeh_as_ok() which determines
> > > if an AddressSpace is usable for EEH (at present this means it has a
> > > single container with exactly one group attached), and vfio_eeh_as_op()
> > > which will perform an operation on an AddressSpace in the unambiguous case,
> > > and otherwise returns an error.
> > > 
> > > This interface still isn't great, but it's enough of an improvement to
> > > allow a number of cleanups in other places.
> > > 
> > > Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> > > Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> > > ---  
> > 
> > I'll let you push this through your tree:
> > 
> > Acked-by: Alex Williamson <alex.williamson@redhat.com>  
> 
> Thanks.  Any guess at when your vGPU series will be pushed?  Mine will
> conflict until that is merged upstream.

It's been out long enough, I'll send a pull request tomorrow.  Thanks,

Alex