linux-kernel - RE: [PATCH v7 00/10] IOMMUFD: Deliver IO page faults to user space

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Date: Mon, 17 Jun 2024 07:46:46 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>, Jason Gunthorpe <jgg@...pe.ca>,
	"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>, "Liu, Yi L" <yi.l.liu@...el.com>, "Jacob
 Pan" <jacob.jun.pan@...ux.intel.com>, Joel Granados <j.granados@...sung.com>
CC: "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"virtualization@...ts.linux-foundation.org"
	<virtualization@...ts.linux-foundation.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v7 00/10] IOMMUFD: Deliver IO page faults to user space

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Sunday, June 16, 2024 2:12 PM
> 
> This series implements the functionality of delivering IO page faults to
> user space through the IOMMUFD framework. One feasible use case is the
> 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 application that is capable of handling IO page faults should
> allocate a fault object, and bind the fault object to any domain that it
> is willing to handle the fault generatd for them. On a successful return
> of fault object allocation, the user can retrieve and respond to page
> faults by reading or writing to the file descriptor (FD) returned.
> 
> The iommu selftest framework has been updated to test the IO page fault
> delivery and response functionality.
> 
> The series and related patches are available on GitHub:
> https://github.com/LuBaolu/intel-iommu/commits/iommufd-io-pgfault-
> delivery-v7
> 

for the entire series:

Reviewed-by: Kevin Tian <kevin.tian@...el.com>