linux-kernel - RE: [PATCH v6 03/10] iommu: Add attach handle to struct iopf

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Date: Wed, 5 Jun 2024 08:23:48 +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 v6 03/10] iommu: Add attach handle to struct iopf_group

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Monday, May 27, 2024 12:05 PM
> 
> @@ -249,6 +249,12 @@ enum iommu_cap {
>  	 */
>  	IOMMU_CAP_DEFERRED_FLUSH,
>  	IOMMU_CAP_DIRTY_TRACKING,	/* IOMMU supports dirty
> tracking */
> +	/*
> +	 * IOMMU driver supports user-managed IOASID table. There is no
> +	 * user domain for each PASID and the I/O page faults are forwarded
> +	 * through the user domain attached to the device RID.
> +	 */
> +	IOMMU_CAP_USER_IOASID_TABLE,
>  };

Given all other context are around PASID let's just call it as USER_PASID_TABLE.

btw this goes differently from your plan in [1] which tried to introduce
different nesting types between Intel and other vendors.

I guess the reason might be that you want to avoid getting the handle
for RID on Intel platform in case of failing to find the handle for the
faulting PASID. and save a new domain type.

this looks fine to me but should be explained.

[1] https://lore.kernel.org/linux-iommu/0de7c71f-571a-4800-8f2b-9eda0c6b75de@linux.intel.com/