Re: [PATCH 0/2] iommu/arm-smmu-v3: SMMU hitting kdump mid-air

[Nicolin Chen]

On Fri, Sep 11, 2026 at 07:54:43AM -0700, Breno Leitao wrote:
> My lovely robot and I came with two patches that solved the problem,
> from a practical perspective and I want to share what has been tested.
> 
> Patch 1 carries the previous kernel's L1 descriptors into the new KDUMP table, so
> those streams keep translating.
> 
> Patch 2 stops the core discarding that again: iommu_dma_init() already
> enables deferred attach for a capture kernel, but the core only honours
> it for drivers implementing .is_attach_deferred, which until now meant
> amd and intel. Without it iommu_setup_default_domain() attaches
> a default domain at probe and the fault returns as F_TRANSLATION.
> 
> The x86 IOMMU drivers solve the same/similar problem the same way; see
> commit 38e5f33ee3596 ("iommu/amd: Reuse device table for kdump").

This looks like my bigger series:
https://lore.kernel.org/linux-iommu/cover.1788130528.git.nicolinc@xxxxxxxxxx/

Would you please help check/test?

Thanks
Nicolin