From: Robin Murphy <robin.murphy@arm.com>
To: Joerg Roedel <joro@8bytes.org>, Jason Gunthorpe <jgg@nvidia.com>
Cc: 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 14:47:11 +0100 [thread overview]
Message-ID: <c48211fe-00b1-e679-21b8-00a85bba599a@arm.com> (raw)
In-Reply-To: <YxnuYTrkC5yoHH84@8bytes.org>
On 2022-09-08 14:30, Joerg Roedel wrote:
> On Thu, Sep 08, 2022 at 10:19:18AM -0300, Jason Gunthorpe wrote:
>> What is the use case for having PASID nested under another level of
>> translation?
>
> Virtualization. Basically having a device access process address spaces
> inside a virtual machine. That got never put into code, but it was the
> rationale behind it.
For SMMUv3 it did actually get as far as a prototype[1] before the
iommufd work interjected. I believe there are cloud vendors using those
patches in their deployments :O
Cheers,
Robin.
[1]
https://lore.kernel.org/linux-iommu/20210423095147.27922-1-vivek.gautam@arm.com/
next prev parent reply other threads:[~2022-09-08 13:47 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
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 [this message]
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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