From: Jason Gunthorpe <jgg@nvidia.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: Robin Murphy <robin.murphy@arm.com>,
Vasant Hegde <vasant.hegde@amd.com>,
iommu@lists.linux.dev, suravee.suthikulpanit@amd.com
Subject: Re: [PATCH v3 0/9] iommu/amd: Add Generic IO Page Table Framework Support for v2 Page Table
Date: Wed, 7 Sep 2022 13:52:18 -0300 [thread overview]
Message-ID: <YxjMQpGYaHfsiuL+@nvidia.com> (raw)
In-Reply-To: <YxintMDEmzSXJUl5@8bytes.org>
On Wed, Sep 07, 2022 at 04:16:20PM +0200, Joerg Roedel wrote:
> On Tue, Sep 06, 2022 at 05:35:13PM +0100, Robin Murphy wrote:
> > Will this series also mean that the domain shenanigans in
> > amd_iommu_init_device() can be replaced by just making sure the GPU gets the
> > proper type of v2 default domain in the first place, so KFD can use its
> > PASIDs on top of that directly, and the audio driver problem goes away
> > naturally?
>
> Yes, on IOMMUs supporting v2 page-tables and declaring a default PASID
> this hack can go away. Unfortunately a lot of AMD IOMMUs in the field do
> not, so the identity mapping hack needs to stay around.
Why can an identity map be attached to the RID in v2, but not a full
translation? It seems like a very strange design that entering PASID
mode completely breaks RID support..
Jason
next prev parent reply other threads:[~2022-09-07 16:52 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-25 6:39 [PATCH v3 0/9] iommu/amd: Add Generic IO Page Table Framework Support for v2 Page Table Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 1/9] iommu/amd/io-pgtable: Implement map_pages io_pgtable_ops callback Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 2/9] iommu/amd/io-pgtable: Implement unmap_pages " Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 3/9] iommu/amd: Add map/unmap_pages() iommu_domain_ops callback support Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 4/9] iommu/amd: Refactor amd_iommu_domain_enable_v2 to remove locking Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 5/9] iommu/amd: Update sanity check when enable PRI/ATS for IOMMU v1 table Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 6/9] iommu/amd: Initial support for AMD IOMMU v2 page table Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 7/9] iommu/amd: Add support for Guest IO protection Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 8/9] iommu/amd: Add support for using AMD IOMMU v2 page table for DMA-API Vasant Hegde
2022-08-25 6:39 ` [PATCH v3 9/9] iommu/amd: Add command-line option to enable different page table Vasant Hegde
2022-09-05 11:39 ` [PATCH v3 0/9] iommu/amd: Add Generic IO Page Table Framework Support for v2 Page Table Vasant Hegde
2022-09-06 16:35 ` Robin Murphy
2022-09-07 14:16 ` Joerg Roedel
2022-09-07 16:52 ` Jason Gunthorpe [this message]
2022-09-07 18:16 ` Robin Murphy
2022-09-08 0:12 ` Jason Gunthorpe
2022-09-08 12:20 ` Joerg Roedel
2022-09-08 12:53 ` Robin Murphy
2022-09-08 13:19 ` Jason Gunthorpe
2022-09-08 13:30 ` Joerg Roedel
2022-09-08 13:47 ` Robin Murphy
2022-09-08 13:58 ` Jason Gunthorpe
2022-09-08 15:23 ` Robin Murphy
2022-09-09 1:24 ` Baolu Lu
2022-09-09 7:51 ` Tian, Kevin
2022-09-07 14:14 ` Joerg Roedel
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