linux-kernel - RE: [PATCH 1/1] iommu/vt-d: Disable PCI ATS in legacy passthrough mode

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Date:   Tue, 14 Nov 2023 03:14:57 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        "Jason Gunthorpe" <jgg@...pe.ca>
CC:     "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] iommu/vt-d: Disable PCI ATS in legacy passthrough
 mode

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Tuesday, November 14, 2023 9:11 AM
> 
> When IOMMU hardware operates in legacy mode, the TT field of the context
> entry determines the translation type, with three supported types (Section
> 9.3 Context Entry):
> 
> - DMA translation without device TLB support
> - DMA translation with device TLB support
> - Passthrough mode with translated and translation requests blocked
> 
> Device TLB support is absent when hardware is configured in passthrough
> mode.
> 
> Disable the PCI ATS feature when IOMMU is configured for passthrough
> translation type in legacy (non-scalable) mode.
> 
> Fixes: 0faa19a1515f ("iommu/vt-d: Decouple PASID & PRI enabling from SVA")
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

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