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

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Hi Shameer,

On Wed, Aug 28, 2024 at 04:31:36PM +0000, Shameerali Kolothum Thodi wrote:
> Hi Nicolin,
> 
> > -----Original Message-----
> > From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> > Sent: Tuesday, August 27, 2024 10:31 PM
> > To: Jason Gunthorpe <jgg@xxxxxxxxxx>
> > Cc: acpica-devel@xxxxxxxxxxxxxxx; Guohanjun (Hanjun Guo)
> > <guohanjun@xxxxxxxxxx>; iommu@xxxxxxxxxxxxxxx; Joerg Roedel
> > <joro@xxxxxxxxxx>; Kevin Tian <kevin.tian@xxxxxxxxx>;
> > kvm@xxxxxxxxxxxxxxx; Len Brown <lenb@xxxxxxxxxx>; linux-
> > acpi@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Lorenzo Pieralisi
> > <lpieralisi@xxxxxxxxxx>; Rafael J. Wysocki <rafael@xxxxxxxxxx>; Robert
> > Moore <robert.moore@xxxxxxxxx>; Robin Murphy
> > <robin.murphy@xxxxxxx>; Sudeep Holla <sudeep.holla@xxxxxxx>; Will
> > Deacon <will@xxxxxxxxxx>; Alex Williamson <alex.williamson@xxxxxxxxxx>;
> > Eric Auger <eric.auger@xxxxxxxxxx>; Jean-Philippe Brucker <jean-
> > philippe@xxxxxxxxxx>; Moritz Fischer <mdf@xxxxxxxxxx>; Michael Shavit
> > <mshavit@xxxxxxxxxx>; patches@xxxxxxxxxxxxxxx; Shameerali Kolothum
> > Thodi <shameerali.kolothum.thodi@xxxxxxxxxx>; Mostafa Saleh
> > <smostafa@xxxxxxxxxx>
> > 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@xxxxxxxxxx/
> 
> 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




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