RE: nested-smmuv3 topic for QEMU/libvirt, Nov 2024

[Shameerali Kolothum Thodi via <qemu-devel@nongnu.org>]

> -----Original Message-----
> From: Nicolin Chen <nicolinc@nvidia.com>
> Sent: Friday, November 1, 2024 7:29 PM
> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>
> Cc: Eric Auger <eric.auger@redhat.com>; Mostafa Saleh
> <smostafa@google.com>; qemu-arm@nongnu.org; qemu-
> devel@nongnu.org; Peter Maydell <peter.maydell@linaro.org>; Jason
> Gunthorpe <jgg@nvidia.com>; Jean-Philippe Brucker <jean-
> philippe@linaro.org>; Moritz Fischer <mdf@kernel.org>; Michael Shavit
> <mshavit@google.com>; Andrea Bolognani <abologna@redhat.com>;
> Michael S. Tsirkin <mst@redhat.com>; Peter Xu <peterx@redhat.com>;
> Zhangfei Gao <zhangfei.gao@linaro.org>; nathanc@nvidia.com;
> arighi@nvidia.com; ianm@nvidia.com; jan@nvidia.com; mochs@nvidia.com
> Subject: Re: nested-smmuv3 topic for QEMU/libvirt, Nov 2024
> 
> On Fri, Nov 01, 2024 at 06:35:23PM +0000, Shameerali Kolothum Thodi
> wrote:
> > > @Shameer,
> > > Do you have some update on the pluggable smmuv3 module?
> >
> > I have a bare minimum prototype code that works with a pluggable
> smmuv3.
> >
> > ...
> > -device pxb-pcie,id=pcie.1,bus_nr=2,bus=pcie.0 \
> > -device pcie-root-port,id=pcie.port1,bus=pcie.1 \
> > -device arm-smmuv3-nested,id=smmuv1,pci-bus=pcie.1 \
> > -device vfio-pci-
> nohotplug,host=0000:75:00.1,bus=pcie.port1,iommufd=iommufd0 \
> > -device pxb-pcie,id=pcie.2,bus_nr=8,bus=pcie.0 \
> > -device pcie-root-port,id=pcie.port2,bus=pcie.2,chassis=8 \
> > -device arm-smmuv3-nested,id=smmuv2,pci-bus=pcie.2 \
> > -device vfio-pci-
> nohotplug,host=0000:7d:02.1,bus=pcie.port2,iommufd=iommufd0 \
> > ...
> >
> > Something like above can now boot a Guest with the latest kernel. But I
> am not
> > sure it actually works correctly. I need a bit more time to update this and
> carry
> > out some tests. Will target that in Nov.
> 
> That looks nice to me! Thanks for the update.

I have sent out an initial RFC here(Might have missed CC few in this email. Apologies.),
https://lore.kernel.org/qemu-devel/20241108125242.60136-1-shameerali.kolothum.thodi@huawei.com/

Please take a look and let me know.

Thanks,
Shameer