From: Jason Gunthorpe <jgg@nvidia.com>
To: Yi Liu <yi.l.liu@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
Justin Stitt <justinstitt@google.com>,
Kevin Tian <kevin.tian@intel.com>,
linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org,
llvm@lists.linux.dev, Bill Wendling <morbo@google.com>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Miguel Ojeda <ojeda@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Shuah Khan <shuah@kernel.org>,
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
Will Deacon <will@kernel.org>, Alexey Kardashevskiy <aik@amd.com>,
Alejandro Jimenez <alejandro.j.jimenez@oracle.com>,
James Gowans <jgowans@amazon.com>,
Michael Roth <michael.roth@amd.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
patches@lists.linux.dev
Subject: Re: [PATCH v2 04/15] iommupt: Add the AMD IOMMU v1 page table format
Date: Fri, 16 May 2025 08:57:37 -0300 [thread overview]
Message-ID: <20250516115737.GC613512@nvidia.com> (raw)
In-Reply-To: <792fbcfc-430d-4d3b-aabe-51cfb6d689a2@intel.com>
On Fri, May 16, 2025 at 04:30:23PM +0800, Yi Liu wrote:
> On 2025/5/5 22:18, Jason Gunthorpe wrote:
> > AMD IOMMU v1 is unique in supporting contiguous pages with a variable size
> > and it can decode the full 64 bit VA space. Unlike other x86 page tables
> > this explicitly does not do sign extension as part of allowing the entire
> > 64 bit VA space to be supported.
>
> aha, do you mean the canonical requirement on the addresses when talking
> the singn extension?
yes
> Actually, VT-d 2nd-stage page tables does not require it as well.
right
Jason
next prev parent reply other threads:[~2025-05-16 11:57 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-05 14:18 [PATCH v2 00/15] Consolidate iommu page table implementations (AMD) Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 01/15] genpt: Generic Page Table base API Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 02/15] genpt: Add Documentation/ files Jason Gunthorpe
2025-05-07 2:37 ` Bagas Sanjaya
2025-05-13 18:53 ` Jason Gunthorpe
2025-05-15 6:21 ` Bagas Sanjaya
2025-05-05 14:18 ` [PATCH v2 03/15] iommupt: Add the basic structure of the iommu implementation Jason Gunthorpe
2025-05-14 9:23 ` Ankit Soni
2025-05-14 15:54 ` Jason Gunthorpe
2025-05-14 20:08 ` Alejandro Jimenez
2025-05-15 19:32 ` Jason Gunthorpe
2025-05-16 5:02 ` Ankit Soni
2025-05-16 20:39 ` Alejandro Jimenez
2025-05-05 14:18 ` [PATCH v2 04/15] iommupt: Add the AMD IOMMU v1 page table format Jason Gunthorpe
2025-05-05 18:48 ` ALOK TIWARI
2025-05-16 8:30 ` Yi Liu
2025-05-16 11:57 ` Jason Gunthorpe [this message]
2025-05-05 14:18 ` [PATCH v2 05/15] iommupt: Add iova_to_phys op Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 06/15] iommupt: Add unmap_pages op Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 07/15] iommupt: Add map_pages op Jason Gunthorpe
2025-05-13 5:15 ` Ankit Soni
2025-05-13 12:00 ` Jason Gunthorpe
2025-06-05 16:49 ` Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 08/15] iommupt: Add read_and_clear_dirty op Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 09/15] iommupt: Add a kunit test for Generic Page Table Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 10/15] iommupt: Add a mock pagetable format for iommufd selftest to use Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 11/15] iommufd: Change the selftest to use iommupt instead of xarray Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 12/15] iommupt: Add the x86 64 bit page table format Jason Gunthorpe
2025-06-05 21:03 ` Jacob Pan
2025-06-06 11:43 ` Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 13/15] iommu/amd: Use the generic iommu page table Jason Gunthorpe
2025-05-05 19:09 ` ALOK TIWARI
2025-05-05 14:18 ` [PATCH v2 14/15] iommu/amd: Remove AMD io_pgtable support Jason Gunthorpe
2025-05-05 14:18 ` [PATCH v2 15/15] iommupt: Add a kunit test for the IOMMU implementation Jason Gunthorpe
2025-05-05 17:44 ` Nathan Chancellor
2025-05-05 17:47 ` Jason Gunthorpe
2025-05-05 18:00 ` Nathan Chancellor
2025-05-13 1:08 ` [PATCH v2 00/15] Consolidate iommu page table implementations (AMD) Alejandro Jimenez
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