linux-kernel - RE: [PATCH v5 13/13] iommu/arm-smmu-v3: Add IOMMU_VIOMMU_TYPE_ARM

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Message-ID: <BN9PR11MB5276DD5AC54621A71CDCC77C8C4A2@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Mon, 28 Oct 2024 02:54:39 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"will@...nel.org" <will@...nel.org>
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Subject: RE: [PATCH v5 13/13] iommu/arm-smmu-v3: Add
 IOMMU_VIOMMU_TYPE_ARM_SMMUV3 support

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, October 26, 2024 7:50 AM
> 
> Add a new driver-type for ARM SMMUv3 to enum iommu_viommu_type.
> Implement
> an arm_vsmmu_alloc() with its viommu op
> arm_vsmmu_domain_alloc_nested(),
> to replace arm_smmu_domain_alloc_nesting(). As an initial step, copy the
> VMID from s2_parent. A later cleanup series is required to move the VMID
> allocation out of the stage-2 domain allocation routine to this.
> 
> After that, replace nested_domain->s2_parent with nested_domain->vsmmu.
> 
> Note that the validatting conditions for a nested_domain allocation are
> moved from arm_vsmmu_domain_alloc_nested to arm_vsmmu_alloc, since
> there
> is no point in creating a vIOMMU (vsmmu) from the beginning if it would
> not support a nested_domain.
> 
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

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