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From: "Tian, Kevin" <kevin.tian@intel.com>
To: Lu Baolu <baolu.lu@linux.intel.com>, Jason Gunthorpe <jgg@ziepe.ca>,
	"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>, "Liu, Yi L" <yi.l.liu@intel.com>, "Jacob
 Pan" <jacob.jun.pan@linux.intel.com>, Joel Granados <j.granados@samsung.com>
CC: "iommu@lists.linux.dev" <iommu@lists.linux.dev>,
	"virtualization@lists.linux-foundation.org"
	<virtualization@lists.linux-foundation.org>, "linux-kernel@vger.kernel.org"
	<linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v6 08/10] iommufd: Associate fault object with
 iommufd_hw_pgtable
Thread-Topic: [PATCH v6 08/10] iommufd: Associate fault object with
 iommufd_hw_pgtable
Thread-Index: AQHar+t2z6Vp85qgr0CwRJGpENTZf7G8GrqQ
Date: Fri, 7 Jun 2024 09:30:28 +0000
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References: <20240527040517.38561-1-baolu.lu@linux.intel.com>
 <20240527040517.38561-9-baolu.lu@linux.intel.com>
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> From: Lu Baolu <baolu.lu@linux.intel.com>
> Sent: Monday, May 27, 2024 12:05 PM
>=20
> When allocating a user iommufd_hw_pagetable, the user space is allowed to
> associate a fault object with the hw_pagetable by specifying the fault
> object ID in the page table allocation data and setting the
> IOMMU_HWPT_FAULT_ID_VALID flag bit.
>=20
> On a successful return of hwpt allocation, the user can retrieve and
> respond to page faults by reading and writing the file interface of the
> fault object.
>=20
> Once a fault object has been associated with a hwpt, the hwpt is
> iopf-capable, indicated by hwpt->fault is non NULL. Attaching,
> detaching, or replacing an iopf-capable hwpt to an RID or PASID will
> differ from those that are not iopf-capable.
>=20
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>

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