Re: [PATCH] iommu/riscv: Add dependency between iommu and devices

[wang.yechao255]

> >
> > From: Wang Yechao <wang.yechao255@xxxxxxxxxx>
> >
> > Commit 9156585280f1 ("ACPI: RIMT: Add dependency between iommu and
> > devices") adds the dependency between iommu and devices on ACPI
> > systems. On devicetree systems, the incorrect removal order also
> > occurs.
> >
> Interesting. Why is it not handled by the fw_devlink infrastructure in DT?
>
> Thanks,
> Sunil

Thank you. I have noticed that commit e149573b2f84 ("of: property: Add device
link support for "iommu-map"") adds support for "iommu-map" to the device link
supplier bindings, so that probing of PCI devices can be deferred until after
the IOMMU is available.

The QEMU RISC-V virt machine currently lacks the "iommu-map" property for the
PCIe bus when the iommu-pci device is used, which leads to this issue. Therefore,
I believe the correct fix is to add the "iommu-map" property for PCIe in QEMU.

Best regards,
Yechao