linux-kernel - Re: [PATCH v9 2/6] iommufd: Allow passing in iopt_access_list_id to iopt_remove

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Date:   Thu, 27 Jul 2023 02:07:02 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <jgg@...dia.com>, <kevin.tian@...el.com>
CC:     <yi.l.liu@...el.com>, <joro@...tes.org>, <will@...nel.org>,
        <robin.murphy@....com>, <alex.williamson@...hat.com>,
        <shuah@...nel.org>, <linux-kernel@...r.kernel.org>,
        <iommu@...ts.linux.dev>, <kvm@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>, <mjrosato@...ux.ibm.com>,
        <farman@...ux.ibm.com>
Subject: Re: [PATCH v9 2/6] iommufd: Allow passing in iopt_access_list_id to
 iopt_remove_access()

On Thu, Jul 27, 2023 at 12:23:07AM -0700, Nicolin Chen wrote:
 
> This is a preparatory change for ioas replacement support for access.
> The replacement routine does an iopt_add_access() at a new IOAS first
> and then iopt_remove_access() at the old IOAS upon the success of the
> first call. However, the first call overrides the iopt_access_list_id
> in the access struct, resulting in that id un-erased in the xarray.
> 
> Add an iopt_access_list_id in iopt_remove_access, so the replacement
> routine can save the id before it gets overwritten, and pass the id
> in iopt_remove_access() for a proper cleanup.
> 
> The existing callers should just pass in access->iopt_access_list_id.
> 
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

Forgot to add:
Suggested-by: Jason Gunthorpe <jgg@...dia.com>