linux-kernel - Re: [PATCH v2 0/6] IOMMUFD: Deliver IO page faults to user space

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Date:   Thu, 30 Nov 2023 11:44:10 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Kevin Tian <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>,
        Yi Liu <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     baolu.lu@...ux.intel.com,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/6] IOMMUFD: Deliver IO page faults to user space

On 2023/11/29 17:08, Shameerali Kolothum Thodi wrote:
> 
> 
>> -----Original Message-----
>> From: Lu Baolu [mailto:baolu.lu@...ux.intel.com]
>> Sent: 26 October 2023 03:49
>> To: Jason Gunthorpe <jgg@...pe.ca>; Kevin Tian <kevin.tian@...el.com>;
>> Joerg Roedel <joro@...tes.org>; Will Deacon <will@...nel.org>; Robin
>> Murphy <robin.murphy@....com>; Jean-Philippe Brucker
>> <jean-philippe@...aro.org>; Nicolin Chen <nicolinc@...dia.com>; Yi Liu
>> <yi.l.liu@...el.com>; Jacob Pan <jacob.jun.pan@...ux.intel.com>
>> Cc: iommu@...ts.linux.dev; linux-kselftest@...r.kernel.org;
>> virtualization@...ts.linux-foundation.org; linux-kernel@...r.kernel.org; Lu
>> Baolu <baolu.lu@...ux.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