linux-kernel - RE: [PATCH 07/12] iommu/vt-d: Cleanup use of iommu_flush_iotlb

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Message-ID: <BN9PR11MB52762CD9DB4CB9DFA3C26A6C8C3B2@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Thu, 28 Mar 2024 07:50:10 +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: "Zhang, Tina" <tina.zhang@...el.com>, "Liu, Yi L" <yi.l.liu@...el.com>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 07/12] iommu/vt-d: Cleanup use of iommu_flush_iotlb_psi()

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Monday, March 25, 2024 10:17 AM
> 
> Use cache_tag_flush_range() in switch_to_super_page() to invalidate the
> necessary caches when switching mappings from normal to super pages. The
> iommu_flush_iotlb_psi() call in intel_iommu_memory_notifier() is
> unnecessary since there should be no cache invalidation for the identity
> domain.
> 

what about a software identity domain?