linux-kernel - Re: [PATCH 0/3] iommu/vt-d: Add support to hitless replace IOMMU domain

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Message-ID: <20260107202812.GD340082@ziepe.ca>
Date: Wed, 7 Jan 2026 16:28:12 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Samiullah Khawaja <skhawaja@...gle.com>
Cc: David Woodhouse <dwmw2@...radead.org>,
	Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	David Matlack <dmatlack@...gle.com>,
	Robin Murphy <robin.murphy@....com>,
	Pratyush Yadav <pratyush@...nel.org>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex@...zbot.org>, Shuah Khan <shuah@...nel.org>,
	iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
	Adithya Jayachandran <ajayachandra@...dia.com>,
	Parav Pandit <parav@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>, William Tu <witu@...dia.com>
Subject: Re: [PATCH 0/3] iommu/vt-d: Add support to hitless replace IOMMU
 domain

On Wed, Jan 07, 2026 at 08:17:57PM +0000, Samiullah Khawaja wrote:
> Intel IOMMU Driver already supports replacing IOMMU domain hitlessly in
> scalable mode.

It does? We were just talking about how it doesn't work because it
makes the PASID entry non-present while loading the new domain.

Jason