Messages in this thread | | | Date | Thu, 30 Nov 2023 11:44:10 +0800 | Subject | Re: [PATCH v2 0/6] IOMMUFD: Deliver IO page faults to user space | From | Baolu Lu <> |
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On 2023/11/29 17:08, Shameerali Kolothum Thodi wrote: > > >> -----Original Message----- >> From: Lu Baolu [mailto:baolu.lu@linux.intel.com] >> Sent: 26 October 2023 03:49 >> To: Jason Gunthorpe <jgg@ziepe.ca>; Kevin Tian <kevin.tian@intel.com>; >> Joerg Roedel <joro@8bytes.org>; Will Deacon <will@kernel.org>; Robin >> Murphy <robin.murphy@arm.com>; Jean-Philippe Brucker >> <jean-philippe@linaro.org>; Nicolin Chen <nicolinc@nvidia.com>; Yi Liu >> <yi.l.liu@intel.com>; Jacob Pan <jacob.jun.pan@linux.intel.com> >> Cc: iommu@lists.linux.dev; linux-kselftest@vger.kernel.org; >> virtualization@lists.linux-foundation.org; linux-kernel@vger.kernel.org; Lu >> Baolu <baolu.lu@linux.intel.com> >> Subject: [PATCH v2 0/6] IOMMUFD: Deliver IO page faults to user space >> >> Hi folks, >> >> This series implements the functionality of delivering IO page faults to >> user space through the IOMMUFD framework for nested translation. Nested >> translation is a hardware feature that supports two-stage translation >> tables for IOMMU. The second-stage translation table is managed by the >> host VMM, while the first-stage translation table is owned by user >> space. This allows user space to control the IOMMU mappings for its >> devices. >> >> When an IO page fault occurs on the first-stage translation table, the >> IOMMU hardware can deliver the page fault to user space through the >> IOMMUFD framework. User space can then handle the page fault and >> respond >> to the device top-down through the IOMMUFD. This allows user space to >> implement its own IO page fault handling policies. >> >> User space indicates its capability of handling IO page faults by >> setting the IOMMU_HWPT_ALLOC_IOPF_CAPABLE flag when allocating a >> hardware page table (HWPT). IOMMUFD will then set up its infrastructure >> for page fault delivery. On a successful return of HWPT allocation, the >> user can retrieve and respond to page faults by reading and writing to >> the file descriptor (FD) returned in out_fault_fd. >> >> The iommu selftest framework has been updated to test the IO page fault >> delivery and response functionality. >> >> This series is based on the latest implementation of nested translation >> under discussion [1] and the page fault handling framework refactoring in >> the IOMMU core [2]. >> >> The series and related patches are available on GitHub: [3] >> >> [1] >> https://lore.kernel.org/linux-iommu/20230921075138.124099-1-yi.l.liu@int >> el.com/ >> [2] >> https://lore.kernel.org/linux-iommu/20230928042734.16134-1-baolu.lu@li >> nux.intel.com/ >> [3] >> https://github.com/LuBaolu/intel-iommu/commits/iommufd-io-pgfault-deliv >> ery-v2 > > Hi Baolu,
Hi Shameer,
> > Do you have a corresponding Qemu git to share? I could give it a spin on our ARM > platform. Please let me know.
This version of the series is tested by the iommufd selftest. We are in process of developing the QEMU code. I will provide the repo link after we complete it.
Best regards, baolu
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