linux-kernel - RE: [PATCH v11 6/8] iommu/vt-d: Prepare for set_dev

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Date:   Thu, 27 Jul 2023 05:48:21 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Robin Murphy" <robin.murphy@....com>
CC:     Jason Gunthorpe <jgg@...dia.com>, Will Deacon <will@...nel.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>
Subject: RE: [PATCH v11 6/8] iommu/vt-d: Prepare for set_dev_pasid callback

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Sent: Tuesday, July 25, 2023 6:26 AM
> 
> From: Lu Baolu <baolu.lu@...ux.intel.com>
> 
> The domain_flush_pasid_iotlb() helper function is used to flush the IOTLB
> entries for a given PASID. Previously, this function assumed that
> RID2PASID was only used for the first-level DMA translation. However, with
> the introduction of the set_dev_pasid callback, this assumption is no
> longer valid.
> 
> Add a check before using the RID2PASID for PASID invalidation. This check
> ensures that the domain has been attached to a physical device before
> using RID2PASID.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>

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