Re: [PATCH v2] iommu/amd: Set translation valid bit only when IO page tables are in used

Suravee Suthikulpanit via iommu
2022-05-26T03:29:25Z

Joerg,

On 5/20/22 3:09 PM, Joerg Roedel wrote:
> Hi Suravee,
>
> On Mon, May 16, 2022 at 07:27:51PM +0700, Suravee Suthikulpanit wrote:
>
>> - Also, it seems that the current iommu v2 page table use case, where GVA->GPA=SPA
>> will no longer be supported on system w/ SNPSup=1. Any thoughts?
>
> Support for that is not upstream yet, it should be easy to disallow this
> configuration and just use the v1 page-tables when SNP is active. This
> can be handled entirely inside the AMD IOMMU driver.
>

Actually, I am referring to when user uses the IOMMU v2 table for shared virtual address
in current iommu_v2 driver (e.g. amd_iommu_init_device(), amd_iommu_bind_pasid).

Best Regards,
Suravee