linux-kernel - Re: [PATCH v3 5/8] iommufd: Associate fault object with iommufd_hw

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Date: Wed, 6 Mar 2024 12:01:20 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Zhangfei Gao <zhangfei.gao@...aro.org>
Cc: Lu Baolu <baolu.lu@...ux.intel.com>, 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>,
	Joel Granados <j.granados@...sung.com>, iommu@...ts.linux.dev,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/8] iommufd: Associate fault object with
 iommufd_hw_pgtable

On Wed, Mar 06, 2024 at 11:15:50PM +0800, Zhangfei Gao wrote:
> 
> Double checked, this does not send flags, 0 is OK,
> Only domain_alloc_user in iommufd_hwpt_paging_alloc requires flags.
> 
> In my debug, I need this patch, otherwise NULL pointer errors happen
> since SVA is not set.

This is some driver bug, we need to get rid of these
iommu_dev_enable_feature() requirements.

Attaching domains with properties should be entirely sufficient.

Jason