Re: [RFC][PATCH v2 00/13] iommu/arm-smmu-v3: Add NVIDIA implementation

[Nicolin Chen]

Hi Kevin,

On Thu, Sep 02, 2021 at 10:27:06PM +0000, Tian, Kevin wrote:

> > Indeed, this looks like a flavour of the accelerated invalidation
> > stuff we've talked about already.
> >
> > I would see it probably exposed as some HW specific IOCTL on the iommu
> > fd to get access to the accelerated invalidation for IOASID's in the
> > FD.
> >
> > Indeed, this seems like a further example of why /dev/iommu is looking
> > like a good idea as this RFC is very complicated to do something
> > fairly simple.
> >
> > Where are thing on the /dev/iommu work these days?
> 
> We are actively working on the basic skeleton. Our original plan is to send
> out the 1st draft before LPC, with support of vfio type1 semantics and
> and pci dev only (single-device group). But later we realized that adding
> multi-devices group support is also necessary even in the 1st draft to avoid
> some dirty hacks and build the complete picture. This will add some time
> though. If things go well, we'll still try hit the original plan. If not, it will be
> soon after LPC.

As I also want to take a look at your work for this implementation,
would you please CC me when you send out your patches? Thank you!