Re: [PATCH v3] iommu: Fix mapping check for 0x0 to avoid re-mapping it

[Joerg Roedel]

On Fri, Feb 27, 2026 at 09:06:37AM +0100, Antheas Kapenekakis wrote:
> Suggested-by: Robin Murphy <robin.murphy@xxxxxxx>
> Fixes: 789a5913b29c ("iommu/amd: Use the generic iommu page table")
> Signed-off-by: Antheas Kapenekakis <lkml@xxxxxxxxxxx>
> 
> ---
> V2: https://lore.kernel.org/all/20260226204400.15573-1-lkml@xxxxxxxxxxx/
> V1: https://lore.kernel.org/lkml/20260221235050.2558321-1-lkml@xxxxxxxxxxx/
> 
> Changes since V2:
>   - When addr is 0, check for address 1 instead. Add Suggested by for
>     Robin. This is an alternate fix.
> 
> Changes since V1:
>   - Remove closes tag. Turns out there are multiple compounding bugs.
>     See [1]
>   - Remove warn log
>   - Remove the addr check and make skipping universal
>   - Cleanup commit message
> 
> [1] https://github.com/CachyOS/linux-cachyos/issues/704
> ---
>  drivers/iommu/iommu.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)

Applied, thanks