Re: [PATCH v4 3/3] iommu: Drop sw_msi from iommu_domain

[Jason Gunthorpe <jgg@nvidia.com>]

On Mon, Mar 24, 2025 at 02:38:33PM -0700, Nicolin Chen wrote:

> My feeling is that we should just let all other cases return 0
> like the previous function did, as this seems to be commonly on
> the IRQ allocation path that shouldn't fail like this. E.g. if
> we fail a blocked domain, would it retry switching domains?

I don't know, I think if the interrupt driver is calling this function
it knows the MSI is translated by the iommu and if the iommu is set to
something like blocked then it really should fail rather than silently
not work. Same for a paging domain without any kind of sw_msi route.

So, I'm feeling like we should check for identity and still fail the
other cases?

Can you send another version of the series with this and Arnd's two
fixes integrated?

Thanks,
Jason