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From: Joerg Roedel <joro@8bytes.org>
To: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: iommu@lists.linux-foundation.org, Jon.Grimm@amd.com,
	linux-kernel@vger.kernel.org, Wei.Huang2@amd.com
Subject: Re: [RFC PATCH 6/7] iommu/amd: Introduce amd_iommu_pgtable command-line option
Date: Thu, 18 Mar 2021 16:33:36 +0100	[thread overview]
Message-ID: <YFNy0LbQAreu64lt@8bytes.org> (raw)
In-Reply-To: <20210312090411.6030-7-suravee.suthikulpanit@amd.com>

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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iommu@lists.linux-foundation.org
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WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	Jon.Grimm@amd.com, Wei.Huang2@amd.com
Subject: Re: [RFC PATCH 6/7] iommu/amd: Introduce amd_iommu_pgtable command-line option
Date: Thu, 18 Mar 2021 16:33:36 +0100	[thread overview]
Message-ID: <YFNy0LbQAreu64lt@8bytes.org> (raw)
In-Reply-To: <20210312090411.6030-7-suravee.suthikulpanit@amd.com>

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?


  reply	other threads:[~2021-03-18 15:34 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-12  9:04 [RFC PATCH 0/7] iommu/amd: Add Generic IO Page Table Framework Support for v2 Page Table Suravee Suthikulpanit
2021-03-12  9:04 ` Suravee Suthikulpanit
2021-03-12  9:04 ` [RFC PATCH 1/7] iommu/amd: Refactor amd_iommu_domain_enable_v2 Suravee Suthikulpanit
2021-03-12  9:04   ` Suravee Suthikulpanit
2021-03-12  9:04 ` [RFC PATCH 2/7] iommu/amd: Update sanity check when enable PRI/ATS Suravee Suthikulpanit
2021-03-12  9:04   ` Suravee Suthikulpanit
2021-03-12  9:04 ` [RFC PATCH 3/7] iommu/amd: Decouple the logic to enable PPR and GT Suravee Suthikulpanit
2021-03-12  9:04   ` Suravee Suthikulpanit
2021-03-12  9:04 ` [RFC PATCH 4/7] iommu/amd: Initial support for AMD IOMMU v2 page table Suravee Suthikulpanit
2021-03-12  9:04   ` Suravee Suthikulpanit
2021-03-18 15:28   ` Joerg Roedel
2021-03-18 15:28     ` Joerg Roedel
2021-03-12  9:04 ` [RFC PATCH 5/7] iommu/amd: Add support for Guest IO protection Suravee Suthikulpanit
2021-03-12  9:04   ` Suravee Suthikulpanit
2021-03-18 15:31   ` Joerg Roedel
2021-03-18 15:31     ` Joerg Roedel
2021-03-25 13:06     ` Suravee Suthikulpanit
2021-03-25 13:06       ` Suravee Suthikulpanit
2021-03-12  9:04 ` [RFC PATCH 6/7] iommu/amd: Introduce amd_iommu_pgtable command-line option Suravee Suthikulpanit
2021-03-12  9:04   ` Suravee Suthikulpanit
2021-03-18 15:33   ` Joerg Roedel [this message]
2021-03-18 15:33     ` Joerg Roedel
2021-03-22  4:24     ` Suravee Suthikulpanit
2021-03-22  4:24       ` Suravee Suthikulpanit
2021-03-12  9:04 ` [RFC PATCH 7/7] iommu/amd: Add support for using AMD IOMMU v2 page table for DMA-API Suravee Suthikulpanit
2021-03-12  9:04   ` Suravee Suthikulpanit
2021-03-18 15:44   ` Joerg Roedel
2021-03-18 15:44     ` Joerg Roedel

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