linux-kernel - RE: [PATCH v3 4/5] iommufd: Add replace support in iommufd_access_set

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Message-ID: <BN9PR11MB527636AE29756D8A188912998CB29@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Thu, 2 Mar 2023 08:23:54 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Nicolin Chen <nicolinc@...dia.com>,
        "jgg@...dia.com" <jgg@...dia.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>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "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 v3 4/5] iommufd: Add replace support in
 iommufd_access_set_ioas()

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, February 25, 2023 9:52 AM
> 
> +	/*
> +	 * Set ioas to NULL to block any further iommufd_access_pin_pages().
> +	 * iommufd_access_unpin_pages() can continue using access-
> >ioas_unpin.
> +	 */
> +	access->ioas = NULL;
> +
> +	mutex_unlock(&access->ioas_lock);
> +	access->ops->unmap(access->data, 0, ULONG_MAX);
> +	mutex_lock(&access->ioas_lock);

This should check whether @unmap is valid.