linux-kernel - Re: [PATCH v4 06/23] iommufd/driver: Add iommufd_struct_destroy to revert iommufd_viommu

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Message-ID: <20250515124911.GH382960@nvidia.com>
Date: Thu, 15 May 2025 09:49:11 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, corbet@....net, will@...nel.org,
	bagasdotme@...il.com, robin.murphy@....com, joro@...tes.org,
	thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
	shuah@...nel.org, jsnitsel@...hat.com, nathan@...nel.org,
	peterz@...radead.org, yi.l.liu@...el.com, mshavit@...gle.com,
	praan@...gle.com, zhangzekun11@...wei.com, iommu@...ts.linux.dev,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kselftest@...r.kernel.org, patches@...ts.linux.dev,
	mochs@...dia.com, alok.a.tiwari@...cle.com, vasant.hegde@....com
Subject: Re: [PATCH v4 06/23] iommufd/driver: Add iommufd_struct_destroy to
 revert iommufd_viommu_alloc

On Wed, May 14, 2025 at 12:21:37PM -0700, Nicolin Chen wrote:
> > Then when the command is over the core code either aborts or finalizes
> > the objects in the iommufd_ucmd. This way you don't have to expose
> > abort and related to drivers.
> 
> I see! Do you want this to apply to the all objects or just driver
> allocated ones?

I would do all the ones that can work that way easily

I think it would just be one patch, replace this patch with that one.

> We would need a bigger preparatory series to roll out that to all
> the allocators, and need to be careful at the existing abort() that
> intertwines with other steps like an unlock().

Those cases with special locking couldn't use it.

Jason