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

[Zhangfei Gao]

Hi, Nico

On Fri, 1 Nov 2024 at 19:55, Jason Gunthorpe <jgg@nvidia.com> wrote:
>
> On Thu, Oct 31, 2024 at 09:09:20PM -0700, Nicolin Chen wrote:
>
> > FWIW, Robin requested a different solution for MSI mapping [1], v.s.
> > the RMR one that we have been using since Eric's work. I drafted a
> > few VFIO/IOMMUFD patches for that,
>
> I also talked to MarcZ about this at LPC and he seems willing to
> consider it. It took a bit to explain everything though. So I think we
> should try in Nov/Dec

When boot qemu, reports this

qemu-system-aarch64: warning: IOMMU_IOAS_MAP failed: Bad address, PCI BAR?
qemu-system-aarch64: vfio_container_dma_map(0xaaaadd30f110,
0x8000200000, 0x10000, 0xffffb8031000) = -14 (Bad address)
qemu-system-aarch64: warning: IOMMU_IOAS_MAP failed: Bad address, PCI BAR?
qemu-system-aarch64: vfio_container_dma_map(0xaaaadd2bc310,
0x8000200000, 0x10000, 0xffffb8031000) = -14 (Bad address)
qemu-system-aarch64: warning: IOMMU_IOAS_MAP failed: Bad address, PCI BAR?
qemu-system-aarch64: vfio_container_dma_map(0xaaaadcf90000,
0x8000200000, 0x10000, 0xffffb8031000) = -14 (Bad address)

Will this also be solved in the new MSI mapping patchset?

Thanks