Re: [PATCH v2 8/8] iommu/arm-smmu-v3: Support IOMMU_DOMAIN_NESTED

Nicolin Chen
2024-09-03T01:15:22Z

On Mon, Sep 02, 2024 at 09:30:22PM -0300, Jason Gunthorpe wrote:

> > I see you are talking in LPC about IOMMUFD:
> > https://lore.kernel.org/linux-iommu/0-v1-01fa10580981+1d-iommu_pt_jgg@nvidia.com/T/#m2dbb08f3bf8506a492bc7dda2de662e42371e683
> >
> > Do you have any plans to talk about this also?
>
> Nothing specific, this is LPC so if people in the room would like to
> use the session for that then we can talk about it. Last year the room
> wanted to talk about PASID mostly.
>
> I haven't heard if someone is going to KVM forum to talk about
> vSMMUv3? Eric? Nicolin do you know?

I am not attending for seemingly in-person option only, nor sure
if there's a topic: it doesn't seem to have an official schedule
yet..

That being said, I think we do need a thread at least, for vSMMU
in the QEMU. The multi-vSMMU design requires to change the vSMMU
module to a pluggable one via QEMU command line, while the PCI-
vSMMU topology should be implemented in libvirt, either of which
needs some effort, where I haven't got bandwidth to spare. Given
that kernel patches are in a solid shape, I think I could start
to borrow some help. I'll draft an email to the qemu-devel list.
Folks joining the forum might be able to carry out a discussion.

Thanks
Nicolin