Re: [PATCH v6 5/7] iommu/riscv: Device directory management.

[Jason Gunthorpe]

On Mon, Jun 10, 2024 at 07:00:34PM -0700, Tomasz Jeznach wrote:

> For now, I'll change the implementation to assume negative caching for
> DDTE and will follow up with device tree / driver updates to make the
> invalidation optional when revised specifications will be available.

Is there a reason to make it optional? It seems like it doesn't have
any performance downside to just always invalidate, attachment is not
a critical path operation.

I could see making something like negative PTE invalidation optional
as that is more performance path..

Jason