linux-kernel - RE: [PATCH v10 2/6] iommufd: Allow passing in iopt_access_list_id to iopt_remove

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Message-ID: <BN9PR11MB5276401B0BEC142A502755BA8C06A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 28 Jul 2023 04:18:29 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "jgg@...dia.com" <jgg@...dia.com>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "farman@...ux.ibm.com" <farman@...ux.ibm.com>
Subject: RE: [PATCH v10 2/6] iommufd: Allow passing in iopt_access_list_id to
 iopt_remove_access()

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Friday, July 28, 2023 4:25 AM
> 
> 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.
> 
> Suggested-by: Jason Gunthorpe <jgg@...dia.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>