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

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Date:   Thu, 26 May 2022 10:29:09 +0700
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        vasant.hegde@....com, jon.grimm@....com
Subject: Re: [PATCH v2] iommu/amd: Set translation valid bit only when IO page
 tables are in used

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