Re: [Qemu-devel] Aspirant for AMD IOMMU emulation project for Outreachy

[Valentine Sinitsyn]

Hi all,

On 09.09.2015 09:23, David kiarie wrote:
> On Wed, Sep 9, 2015 at 12:35 AM, Jan Kiszka <address@hidden> wrote:
> > [thanks for forwarding, Peter]
> >
> > Hi Rita,
> >
> > On 2015-09-08 10:11, Peter Maydell wrote:
> > > On 7 September 2015 at 22:31, Rita Sinha <address@hidden> wrote:
> > > > Hi Jan,
> > > >
> > > > I am interested in participating in next round of Outreachy program
> > > > with AMD IOMMU emulation project.
> > > >
> > > >
> > > > I have worked on BIOS projects which includes coreboot SeaBios etc and
> > > > bootloaders like u-boot and grub. I have experience of working with
> > > > qemu and feel that this project is the right match for my skillset.
> > > > Kindly guide me how to go ahead with this.
> >
> > The particular AMD IOMMU project moved on since we listed it. I'm CC'ing
> > David, who is currently working on it and just recently posted related
> > patches, and Valentine who probably oversees the status better than I
> > (due to my lacking involvement recently). David, maybe you can briefly
> > comment on status and plans of your work.
>
> Hi all,
>
> Most recent work is here
> http://lists.nongnu.org/archive/html/qemu-devel/2015-08/msg02759.html
> . Most the code is Qemu device boilerplate(so there are a ton of
> things to add but I wanted to have the existing work merged first).
> The IOMMU just offers basic translation. From Valentine's previous
> comments, I only have a few minor issues to fix in the code.
This is a bit of off-topic here, but I'd argue they are minor. There are 
some inaccuracies in emulation, and IOMMU itself is rather 
feature-limited, just as you said. I doubt I'd be able to run current 
Jailhouse implementation on it, for instance, albeit I haven't tried. 
So, your patches are good start, but I feel there's a somewhat long way 
before they actually get merged.

So, in short: there are still tasks to be done in AMD IOMMU emulation 
project. I also feel it's possible to parallelize them so David and Rita 
can continue without stepping at each other toe, if the program permits it.

> I obviously do other things alongside :-D this project but given some
> time I could get the code merged and continue to add other features.
>
> > For the Outreachy program, just like for GSoC, we need to find a good
> > topic that is sufficiently clear defined on program start and not worked
> > on in parallel during the runtime. There are still a number of open
> > topics in this area, e.g. around the older Intel IOMMU model (error
> > handling and reporting, interrupt remapping), or maybe we find something
> > different - depends on your interests and experiences. Do you have any
> > public references to your previous work?
> >
> > Then I'd suggest to schedule an irc meeting to discuss your interests
> > and background a bit further and consider available options.
> >
> > Jan

Regards,
Valentine