[PATCH v2 0/8] Initial support for SMMUv3 nested translation

[Nicolin Chen]

Hi Shameer,

On Wed, Aug 28, 2024 at 04:31:36PM +0000, Shameerali Kolothum Thodi wrote:
> Hi Nicolin,
> 
> > -----Original Message-----
> > From: Nicolin Chen <nicolinc at nvidia.com>
> > Sent: Tuesday, August 27, 2024 10:31 PM
> > To: Jason Gunthorpe <jgg at nvidia.com>
> > Cc: acpica-devel at lists.linux.dev; Guohanjun (Hanjun Guo)
> > <guohanjun at huawei.com>; iommu at lists.linux.dev; Joerg Roedel
> > <joro at 8bytes.org>; Kevin Tian <kevin.tian at intel.com>;
> > kvm at vger.kernel.org; Len Brown <lenb at kernel.org>; linux-
> > acpi at vger.kernel.org; linux-arm-kernel at lists.infradead.org; Lorenzo Pieralisi
> > <lpieralisi at kernel.org>; Rafael J. Wysocki <rafael at kernel.org>; Robert
> > Moore <robert.moore at intel.com>; Robin Murphy
> > <robin.murphy at arm.com>; Sudeep Holla <sudeep.holla at arm.com>; Will
> > Deacon <will at kernel.org>; Alex Williamson <alex.williamson at redhat.com>;
> > Eric Auger <eric.auger at redhat.com>; Jean-Philippe Brucker <jean-
> > philippe at linaro.org>; Moritz Fischer <mdf at kernel.org>; Michael Shavit
> > <mshavit at google.com>; patches at lists.linux.dev; Shameerali Kolothum
> > Thodi <shameerali.kolothum.thodi at huawei.com>; Mostafa Saleh
> > <smostafa at google.com>
> > Subject: Re: [PATCH v2 0/8] Initial support for SMMUv3 nested translation
> >
> 
> > As mentioned above, the VIOMMU series would be required to test the
> > entire nesting feature, which now has a v2 rebasing on this series. I tested it
> > with a paring QEMU branch. Please refer to:
> > https://lore.kernel.org/linux-
> > iommu/cover.1724776335.git.nicolinc at nvidia.com/
> 
> Thanks for this. I haven't gone through the viommu and its Qemu branch
> yet.  The way we present nested-smmuv3/iommufd to the Qemu seems to
> have changed  with the above Qemu branch(multiple nested SMMUs).
> The old Qemu command line for nested setup doesn't work anymore.
> 
> Could you please share an example Qemu command line  to verify this
> series(Sorry, if I missed it in the links/git).

My bad. I updated those two "for_iommufd_" QEMU branches with a
README commit on top of each for the reference command.

By the way, I wonder how many SMMUv3 instances there are on the
platforms that SMMUv3 developers here are running on -- if some
one is also working on a chip that has multiple instances?

Thanks
Nicolin