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SubjectRe: [RFC PATCH 6/7] iommu/amd: Introduce amd_iommu_pgtable command-line option
On Fri, Mar 12, 2021 at 03:04:10AM -0600, Suravee Suthikulpanit wrote:
> To allow specification whether to use v1 or v2 IOMMU pagetable for
> DMA remapping when calling kernel DMA-API.
>
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 6 ++++++
> drivers/iommu/amd/init.c | 15 +++++++++++++++
> 2 files changed, 21 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 04545725f187..466e807369ea 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -319,6 +319,12 @@
> This mode requires kvm-amd.avic=1.
> (Default when IOMMU HW support is present.)
>
> + amd_iommu_pgtable= [HW,X86-64]
> + Specifies one of the following AMD IOMMU page table to
> + be used for DMA remapping for DMA-API:
> + v1 - Use v1 page table (Default)
> + v2 - Use v2 page table

Any reason v2 can not be the default when it is supported by the IOMMU?

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