linux-kernel - Re: [PATCH v3 04/11] iommufd/viommu: Add IOMMU_VIOMMU

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Message-ID: <20241017164015.GD3559746@nvidia.com>
Date: Thu, 17 Oct 2024 13:40:15 -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 04/11] iommufd/viommu: Add IOMMU_VIOMMU_ALLOC ioctl

On Wed, Oct 09, 2024 at 09:38:04AM -0700, Nicolin Chen wrote:
> Add a new ioctl for user space to do a vIOMMU allocation. It must be based
> on a nesting parent HWPT, so take its refcount.
> 
> As an initial version, define an IOMMU_VIOMMU_TYPE_DEFAULT type. Using it,
> the object will be allocated by the iommufd core.
> 
> If an IOMMU driver supports a driver-managed vIOMMU object, it must define
> its own IOMMU_VIOMMU_TYPE_ in the uAPI header and implement a viommu_alloc
> op in its iommu_ops.
> 
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  drivers/iommu/iommufd/Makefile          |  3 +-
>  drivers/iommu/iommufd/iommufd_private.h |  3 +
>  include/uapi/linux/iommufd.h            | 40 +++++++++++
>  drivers/iommu/iommufd/main.c            |  6 ++
>  drivers/iommu/iommufd/viommu.c          | 91 +++++++++++++++++++++++++
>  5 files changed, 142 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/iommu/iommufd/viommu.c

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason