linux-kernel - Re: [PATCH v3 1/5] iommufd: Add iommufd_object_tombstone

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Message-ID: <aGLqoSTOfppG1MbB@Asurada-Nvidia>
Date: Mon, 30 Jun 2025 12:50:57 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Xu Yilun <yilun.xu@...ux.intel.com>
CC: <jgg@...dia.com>, <jgg@...pe.ca>, <kevin.tian@...el.com>,
	<will@...nel.org>, <aneesh.kumar@...nel.org>, <iommu@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <joro@...tes.org>, <robin.murphy@....com>,
	<shuah@...nel.org>, <aik@....com>, <dan.j.williams@...el.com>,
	<baolu.lu@...ux.intel.com>, <yilun.xu@...el.com>
Subject: Re: [PATCH v3 1/5] iommufd: Add iommufd_object_tombstone_user()
 helper

On Fri, Jun 27, 2025 at 11:38:05AM +0800, Xu Yilun wrote:
> Add the iommufd_object_tombstone_user() helper, which allows the caller
> to destroy an iommufd object created by userspace.

Should we describe it "partially destroy"?

> This is useful on some destroy paths when the kernel caller finds the
> object should have been removed by userspace but is still alive. With
> this helper, the caller destroys the object but leave the object ID
> reserved (so called tombstone). The tombstone prevents repurposing the
> object ID without awareness of the original user.
> 
> Since this happens for abnomal userspace behavior, for simplicity, the

s/abnomal/abnormal

Nicolin