linux-kernel - RE: [PATCH v3 6/6] iommu/vt-d: Remove unnecessary checks in iopf disabling path

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Message-ID: <BN9PR11MB52765ACD4408975FBB7EC4A78C889@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Tue, 28 Mar 2023 02:11:46 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Robin Murphy" <robin.murphy@....com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 6/6] iommu/vt-d: Remove unnecessary checks in iopf
 disabling path

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Friday, March 24, 2023 8:03 PM
> 
> iommu_unregister_device_fault_handler() and iopf_queue_remove_device()
> are called after device has stopped issuing new page falut requests and
> all outstanding page requests have been drained. They should never fail.
> Trigger a warning if it happens unfortunately.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

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