From: Jason Gunthorpe <jgg@nvidia.com>
To: Alexey Kardashevskiy <aik@amd.com>
Cc: Alexandre Ghiti <alex@ghiti.fr>, Anup Patel <anup@brainfault.org>,
Albert Ou <aou@eecs.berkeley.edu>,
Jonathan Corbet <corbet@lwn.net>,
iommu@lists.linux.dev, Joerg Roedel <joro@8bytes.org>,
Justin Stitt <justinstitt@google.com>,
linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-riscv@lists.infradead.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>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <pjw@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Shuah Khan <shuah@kernel.org>,
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
Will Deacon <will@kernel.org>,
Alejandro Jimenez <alejandro.j.jimenez@oracle.com>,
James Gowans <jgowans@amazon.com>,
Kevin Tian <kevin.tian@intel.com>,
Michael Roth <michael.roth@amd.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
patches@lists.linux.dev, Samiullah Khawaja <skhawaja@google.com>,
Vasant Hegde <vasant.hegde@amd.com>
Subject: Re: [PATCH v8 07/15] iommupt: Add map_pages op
Date: Thu, 26 Feb 2026 11:04:40 -0400 [thread overview]
Message-ID: <20260226150440.GB5933@nvidia.com> (raw)
In-Reply-To: <bc6817bd-4aa5-4033-b89d-88fef637de65@amd.com>
On Thu, Feb 26, 2026 at 10:11:56AM +1100, Alexey Kardashevskiy wrote:
> > The flow would be some thing like..
> > 1) Create an IOAS
> > 2) Create a HWPT. If there is some known upper bound on RMP/etc page
> > size then limit the HWPT page size to the upper bound
> > 3) Map stuff into the ioas
> > 4) Build the RMP/etc and map ranges of page granularity
> > 5) Call iommufd to adjust the page size within ranges
>
> I am about to try this approach now. 5) means splitting bigger pages
> to smaller and I remember you working on that hitless IO PDEs
> smashing, do you have something to play with? I could not spot
> anything on github but do not want to reinvent. Thanks,
I thought this thread had concluded you needed to use the HW engines
for this and if so then KVM should maintain the IOMMU S2 where it can
synchronize things and access the HW engines?
My draft for cut is here:
https://github.com/jgunthorpe/linux/commits/iommu_pt_all/
iommupt: Add cut_mapping op
Jason
next prev parent reply other threads:[~2026-02-26 15:04 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-04 18:29 [PATCH v8 00/15] Consolidate iommu page table implementations (AMD) Jason Gunthorpe
2025-11-04 18:29 ` [PATCH v8 01/15] genpt: Generic Page Table base API Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 02/15] genpt: Add Documentation/ files Jason Gunthorpe
2025-11-04 23:49 ` Randy Dunlap
2025-11-05 18:51 ` Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 03/15] iommupt: Add the basic structure of the iommu implementation Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 04/15] iommupt: Add the AMD IOMMU v1 page table format Jason Gunthorpe
2025-11-04 18:51 ` Randy Dunlap
2025-11-04 18:30 ` [PATCH v8 05/15] iommupt: Add iova_to_phys op Jason Gunthorpe
2025-11-04 19:02 ` Randy Dunlap
2025-11-04 19:19 ` Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 06/15] iommupt: Add unmap_pages op Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 07/15] iommupt: Add map_pages op Jason Gunthorpe
2026-01-17 4:54 ` Alexey Kardashevskiy
2026-01-17 15:43 ` Jason Gunthorpe
2026-01-19 1:00 ` Alexey Kardashevskiy
2026-01-19 17:37 ` Jason Gunthorpe
2026-01-21 1:08 ` Alexey Kardashevskiy
2026-01-21 17:09 ` Jason Gunthorpe
2026-01-22 10:58 ` Alexey Kardashevskiy
2026-01-22 14:12 ` Jason Gunthorpe
2026-01-23 1:07 ` Alexey Kardashevskiy
2026-01-23 14:14 ` Jason Gunthorpe
2026-01-27 8:08 ` Alexey Kardashevskiy
2026-01-27 14:25 ` Jason Gunthorpe
2026-01-28 1:42 ` Alexey Kardashevskiy
2026-01-28 13:32 ` Jason Gunthorpe
2026-01-29 0:33 ` Alexey Kardashevskiy
2026-01-29 1:17 ` Jason Gunthorpe
2026-02-25 23:11 ` Alexey Kardashevskiy
2026-02-26 15:04 ` Jason Gunthorpe [this message]
2026-02-27 1:39 ` Alexey Kardashevskiy
2026-02-27 13:48 ` Jason Gunthorpe
2026-03-02 0:02 ` Alexey Kardashevskiy
2026-03-02 0:41 ` Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 08/15] iommupt: Add read_and_clear_dirty op Jason Gunthorpe
2025-11-04 19:13 ` Randy Dunlap
2025-11-04 19:17 ` Jason Gunthorpe
2025-11-04 19:19 ` Randy Dunlap
2025-11-04 18:30 ` [PATCH v8 09/15] iommupt: Add a kunit test for Generic Page Table Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 10/15] iommupt: Add a mock pagetable format for iommufd selftest to use Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 11/15] iommufd: Change the selftest to use iommupt instead of xarray Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 12/15] iommupt: Add the x86 64 bit page table format Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 13/15] iommu/amd: Use the generic iommu page table Jason Gunthorpe
2025-11-05 16:01 ` Ankit Soni
2025-11-05 16:57 ` Jason Gunthorpe
2025-12-05 2:40 ` Lai, Yi
2025-12-05 19:46 ` Jason Gunthorpe
2025-12-05 20:07 ` Alejandro Jimenez
2025-11-04 18:30 ` [PATCH v8 14/15] iommu/amd: Remove AMD io_pgtable support Jason Gunthorpe
2025-11-04 18:30 ` [PATCH v8 15/15] iommupt: Add a kunit test for the IOMMU implementation Jason Gunthorpe
2025-11-05 8:45 ` [PATCH v8 00/15] Consolidate iommu page table implementations (AMD) Joerg Roedel
2025-11-05 12:43 ` Jason Gunthorpe
2025-12-19 8:10 ` patchwork-bot+linux-riscv
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