linux-kernel - Re: [PATCH 0/4] iommu/amd: Force SNP-enabled VFIO domain to 4K page size

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Message-ID: <8d44d547-2da0-008a-e0eb-e42d40ab993d@amd.com>
Date:   Mon, 16 Jan 2023 07:17:38 -0600
From:   Eric van Tassell <evantass@....com>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux.dev
Cc:     joro@...tes.org, robin.murphy@....com, ashish.kalra@....com,
        thomas.lendacky@....com, vasant.hegde@....com, jon.grimm@....com
Subject: Re: [PATCH 0/4] iommu/amd: Force SNP-enabled VFIO domain to 4K page
 size

what commit should this series apply onto?


-evt

On 1/10/23 08:31, Suravee Suthikulpanit wrote:
> To support VFIO pass-through device with SNP-enabled guest, IOMMU needs to
> setup IOMMU page table with matching page size to the RMP. In order for
> the IOMMU driver to setup page table appropriately, it needs to determine:
>
> 1. If an IOMMU domain is a VFIO domain (PATCH 1)
> 2. If an IOMMU domain belongs to an SNP-enabled guest (PATCH 2,3)
> 3. Appropriate page size the IOMMU domain (PATCH 4)
>
> Please note that patch 2/4 is a preparatory patch for an upcoming series
> to support SNP, which implements the call-back for the struct
> amd_iommu_svm_ops.is_snp_guest().
>
> Best Regards,
> Suravee
>
> Suravee Suthikulpanit (4):
>    iommu/amd: Introduce Protection-domain flag VFIO
>    iommu/amd: Introduce structure amd_iommu_svm_ops.is_snp_guest()
>    iommu: Introduce IOMMU call-back for processing struct KVM assigned to
>      VFIO
>    iommu/amd: Force SNP-enabled VFIO domain to 4K page size
>
>   drivers/iommu/amd/amd_iommu_types.h |  3 ++
>   drivers/iommu/amd/iommu.c           | 45 +++++++++++++++++++++++++++--
>   drivers/iommu/iommu.c               | 10 +++++++
>   drivers/vfio/vfio_main.c            |  1 +
>   include/linux/amd-iommu.h           |  6 ++++
>   include/linux/iommu.h               |  4 +++
>   6 files changed, 67 insertions(+), 2 deletions(-)
>