linux-kernel - Re: [PATCH v3 11/11] iommu/arm-smmu-v3: Add IOMMU_VIOMMU_TYPE_ARM

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Message-ID: <20241017164123.GE3559746@nvidia.com>
Date: Thu, 17 Oct 2024 13:41:23 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, will@...nel.org, joro@...tes.org,
	suravee.suthikulpanit@....com, robin.murphy@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, shuah@...nel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, eric.auger@...hat.com,
	jean-philippe@...aro.org, mdf@...nel.org, mshavit@...gle.com,
	shameerali.kolothum.thodi@...wei.com, smostafa@...gle.com,
	yi.l.liu@...el.com, aik@....com, patches@...ts.linux.dev
Subject: Re: [PATCH v3 11/11] iommu/arm-smmu-v3: Add
 IOMMU_VIOMMU_TYPE_ARM_SMMUV3 support

On Thu, Oct 17, 2024 at 09:28:16AM -0700, Nicolin Chen wrote:
> On Wed, Oct 09, 2024 at 09:38:11AM -0700, Nicolin Chen wrote:
> > Add a new driver-type for ARM SMMUv3 to enum iommu_viommu_type. Implement
> > the viommu_alloc op with an arm_vsmmu_alloc function. 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.
> > 
> > Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> > ---
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   | 18 ++++++++++++++
> >  include/uapi/linux/iommufd.h                  |  2 ++
> >  .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c     | 24 +++++++++++++++++++
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   |  1 +
> >  4 files changed, 45 insertions(+)
> 
> I squashed the following changes to this commit (will be in v4).
> It replaces nested_domain->s2_parent with nested_domain->vsmmu

Err, do we want to make a viommu a hard requirement to use nesting? Is
that what is happening here?

Jason