linux-kernel - RE: [PATCH v5 4/5] iommu: Introduce iommu_dev_reset_prepare() and iommu_dev_reset

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Message-ID: <BN9PR11MB527668CC33F2356E689AF8F38CC9A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Mon, 17 Nov 2025 04:59:33 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "joro@...tes.org" <joro@...tes.org>,
	"afael@...nel.org" <afael@...nel.org>, "bhelgaas@...gle.com"
	<bhelgaas@...gle.com>, "alex@...zbot.org" <alex@...zbot.org>,
	"jgg@...dia.com" <jgg@...dia.com>
CC: "will@...nel.org" <will@...nel.org>, "robin.murphy@....com"
	<robin.murphy@....com>, "lenb@...nel.org" <lenb@...nel.org>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "iommu@...ts.linux.dev"
	<iommu@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-acpi@...r.kernel.org"
	<linux-acpi@...r.kernel.org>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>, "Jaroszynski, Piotr"
	<pjaroszynski@...dia.com>, "Sethi, Vikram" <vsethi@...dia.com>,
	"helgaas@...nel.org" <helgaas@...nel.org>, "etzhao1900@...il.com"
	<etzhao1900@...il.com>
Subject: RE: [PATCH v5 4/5] iommu: Introduce iommu_dev_reset_prepare() and
 iommu_dev_reset_done()

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Tuesday, November 11, 2025 1:13 PM
> 
> + *
> + * This function attaches all RID/PASID of the device's to
> IOMMU_DOMAIN_BLOCKED
> + * allowing any blocked-domain-supporting IOMMU driver to pause
> translation and

__iommu_group_alloc_blocking_domain() will allocate a paging
domain if a driver doesn't support blocked_domain itself. So in the
end this applies to all IOMMU drivers.

I saw several other places mention IOMMU_DOMAIN_BLOCKED in this
series. Not very accurate.