From: Joerg Roedel <joro@8bytes.org>
To: Vasant Hegde <vasant.hegde@amd.com>
Cc: iommu@lists.linux-foundation.org
Subject: Re: [PATCH v1 0/7] iommu/amd: Add Generic IO Page Table Framework Support for v2 Page Table
Date: Wed, 6 Jul 2022 11:14:23 +0200 [thread overview]
Message-ID: <YsVSb2LssZINNsOm@8bytes.org> (raw)
In-Reply-To: <5ad3770b-16a5-9148-54dc-5dcb93efcc81@amd.com>
On Tue, Jun 28, 2022 at 02:35:51PM +0530, Vasant Hegde wrote:
> Sorry. I didn't get last statement ("device identity maps DMA requests without PASID").
> Can you please elaborate?
When using v1 page-tables, each device supporting ATS/PRI/PASID needs to
be direct-mapped, because the v1 page-tables basically act as a stage-2
page table for the PASID ones.
But when the non-pasid case moves to the pasid==0 page-table, then there
is not stage-2 anymore and a device can be used with ATS/PRI/PASID while
non-PASID requests are translated too, no?
I didn't get how this is handled in the current patch-set.
Regards,
Joerg
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next prev parent reply other threads:[~2022-07-06 9:14 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-03 11:21 [PATCH v1 0/7] iommu/amd: Add Generic IO Page Table Framework Support for v2 Page Table Vasant Hegde via iommu
2022-06-03 11:21 ` [PATCH v1 1/7] iommu/amd: Refactor amd_iommu_domain_enable_v2 Vasant Hegde via iommu
2022-06-03 11:21 ` [PATCH v1 2/7] iommu/amd: Update sanity check when enable PRI/ATS Vasant Hegde via iommu
2022-06-03 11:21 ` [PATCH v1 3/7] iommu/amd: Fix sparse warning Vasant Hegde via iommu
2022-06-23 8:03 ` Joerg Roedel
2022-06-23 9:42 ` Robin Murphy
2022-06-23 11:30 ` Joerg Roedel
2022-06-27 10:29 ` Vasant Hegde via iommu
2022-07-13 4:07 ` Vasant Hegde
2022-07-15 11:32 ` Robin Murphy
2022-06-03 11:21 ` [PATCH v1 4/7] iommu/amd: Initial support for AMD IOMMU v2 page table Vasant Hegde via iommu
2022-06-23 8:09 ` Joerg Roedel
2022-06-03 11:21 ` [PATCH v1 5/7] iommu/amd: Add support for Guest IO protection Vasant Hegde via iommu
2022-06-03 11:21 ` [PATCH v1 6/7] iommu/amd: Add support for using AMD IOMMU v2 page table for DMA-API Vasant Hegde via iommu
2022-06-03 11:21 ` [PATCH v1 7/7] iommu/amd: Introduce amd_iommu_pgtable command-line option Vasant Hegde via iommu
2022-06-23 8:12 ` Joerg Roedel
2022-06-28 7:53 ` Vasant Hegde via iommu
2022-07-06 9:11 ` Joerg Roedel
2022-06-23 8:15 ` [PATCH v1 0/7] iommu/amd: Add Generic IO Page Table Framework Support for v2 Page Table Joerg Roedel
2022-06-28 9:05 ` Vasant Hegde via iommu
2022-07-06 9:14 ` Joerg Roedel [this message]
2022-07-13 3:07 ` Suthikulpanit, Suravee
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