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

[Shameerali Kolothum Thodi via]

> -----Original Message-----
> From: Nicolin Chen <nicol...@nvidia.com>
> Sent: Friday, November 1, 2024 7:29 PM
> To: Shameerali Kolothum Thodi <shameerali.kolothum.th...@huawei.com>
> Cc: Eric Auger <eric.au...@redhat.com>; Mostafa Saleh
> <smost...@google.com>; qemu-...@nongnu.org; qemu-
> de...@nongnu.org; Peter Maydell <peter.mayd...@linaro.org>; Jason
> Gunthorpe <j...@nvidia.com>; Jean-Philippe Brucker <jean-
> phili...@linaro.org>; Moritz Fischer <m...@kernel.org>; Michael Shavit
> <msha...@google.com>; Andrea Bolognani <abolo...@redhat.com>;
> Michael S. Tsirkin <m...@redhat.com>; Peter Xu <pet...@redhat.com>;
> Zhangfei Gao <zhangfei....@linaro.org>; nath...@nvidia.com;
> ari...@nvidia.com; i...@nvidia.com; j...@nvidia.com; mo...@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.th...@huawei.com/

Please take a look and let me know.

Thanks,
Shameer