From: Joerg Roedel <joro@8bytes.org>
To: Jason Gunthorpe <jgg@nvidia.com>
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: Thu, 8 Sep 2022 14:20:55 +0200 [thread overview]
Message-ID: <YxneJ2RqaatKmoYT@8bytes.org> (raw)
In-Reply-To: <YxjMQpGYaHfsiuL+@nvidia.com>
On Wed, Sep 07, 2022 at 01:52:18PM -0300, Jason Gunthorpe wrote:
> 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.
The reason is that AMD IOMMUs do two-level translation, which means that
the addresses in the PASID page-tables are translated via the v1
page-table again. In order to be able to use Linux page-tables for PASID
mappings the v1 page-table needs to be identity mapped.
Regards,
Joerg
next prev parent reply other threads:[~2022-09-08 12:21 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
2022-09-07 18:16 ` Robin Murphy
2022-09-08 0:12 ` Jason Gunthorpe
2022-09-08 12:20 ` Joerg Roedel [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YxneJ2RqaatKmoYT@8bytes.org \
--to=joro@8bytes.org \
--cc=iommu@lists.linux.dev \
--cc=jgg@nvidia.com \
--cc=robin.murphy@arm.com \
--cc=suravee.suthikulpanit@amd.com \
--cc=vasant.hegde@amd.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.