linux-kernel - RE: [PATCH v3 2/7] iommu/vt-d: Add device_block

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Message-ID: <BN9PR11MB5276084177CBB231521AE2218C079@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Wed, 16 Nov 2022 03:49:51 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
CC:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        "Robin Murphy" <robin.murphy@....com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 2/7] iommu/vt-d: Add device_block_translation() helper

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Monday, November 14, 2022 9:41 AM
> 
> If domain attaching to device fails, the IOMMU driver should bring the
> device to blocking DMA state. The upper layer is expected to recover it
> by attaching a new domain. Use device_block_translation() in the error
> path of dev_attach to make the behavior specific.
> 
> The difference between device_block_translation() and the previous
> dmar_remove_one_dev_info() is that, in the scalable mode, it is the
> RID2PASID entry instead of context entry being cleared. As a result,
> enabling PCI capabilities is moved up.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

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