Re: [PATCH v3 2/2] iommu/amd: Adhere to IVINFO[VASIZE] for address limits

[Jason Gunthorpe]

On Mon, Mar 09, 2026 at 02:05:28PM +0000, Ankit Soni wrote:
> ACPI IVRS IVHD’s IVINFO field reports the maximum virtual address
> size (VASIZE) supported by the IOMMU. The AMD IOMMU driver currently
> caps this with pagetable level reported by EFR[HATS] when configuring
> paging domains (hw_max_vasz_lg2). On systems where firmware or VM
> advertises smaller or different limits, the driver may over-advertise
> capabilities and create domains outside the hardware’s actual bounds.
> 
> Signed-off-by: Ankit Soni <Ankit.Soni@xxxxxxx>
> ---
>  drivers/iommu/amd/amd_iommu.h       |  2 +-
>  drivers/iommu/amd/amd_iommu_types.h |  1 +
>  drivers/iommu/amd/init.c            | 13 +++++++++----
>  drivers/iommu/amd/iommu.c           |  3 +--
>  4 files changed, 12 insertions(+), 7 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Jason