linux-kernel - RE: [PATCH 2/2] iommu/vt-d: Remove caching mode check before devtlb flush

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Message-ID: <BN9PR11MB52763F42ED6719E6D03D0D308C062@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Wed, 10 Apr 2024 00:32:06 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Jacob Pan <jacob.jun.pan@...ux.intel.com>, Baolu Lu
	<baolu.lu@...ux.intel.com>
CC: "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>, "Liu, Yi L"
	<yi.l.liu@...el.com>, Joerg Roedel <joro@...tes.org>, Will Deacon
	<will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] iommu/vt-d: Remove caching mode check before devtlb
 flush

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Sent: Wednesday, April 10, 2024 1:32 AM
> 
> If the guest uses SL page tables in vIOMMU, we don;t expose ATS to the
> guest. So ATS is not relevant here, does't matter map or unmap.
> 

ATS is orthogonal to SL vs. FL. Where is this restriction coming from?