Re: [PATCH v3 2/5] iommu/amd: Fix DTE clearing and rename iommu_ignore_device()

[Jason Gunthorpe]

On Tue, Aug 25, 2026 at 05:29:59PM +0000, Pranjal Shrivastava wrote:

> I agree, but I wonder why the existing code used memset here 
> (in ignore_device):
> 
> memset(&dev_table[devid], 0, sizeof(struct dev_table_entry));
> 
> I was thinking it might've been done for probe failures in a kdump
> kernel (normal kexec would've called shutdown for clearing all DTEs).
> (I see this was added long time back and existed when PCI segments were
> added [1]).

For kdump you'd want to keep the original translation running in this
case.
 
> Are you suggesting to remove the DTE clearing from this path entirely?

Yes

Jason