linux-kernel - Re: [PATCH v2 04/19] iommufd: Allow pt_id to carry viommu_id for IOMMU_HWPT

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Message-ID: <20240905155613.GO1358970@nvidia.com>
Date: Thu, 5 Sep 2024 12:56:13 -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
Subject: Re: [PATCH v2 04/19] iommufd: Allow pt_id to carry viommu_id for
 IOMMU_HWPT_ALLOC

On Tue, Aug 27, 2024 at 09:59:41AM -0700, Nicolin Chen wrote:
> Now a VIOMMU can wrap a shareable nested parent HWPT. So, it can act like
> a nested parent HWPT to allocate a nested HWPT.
> 
> Support that in the IOMMU_HWPT_ALLOC ioctl handler, and update its kdoc.
> 
> Also, associate a viommu to an allocating nested HWPT.
> 
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  drivers/iommu/iommufd/hw_pagetable.c    | 24 ++++++++++++++++++++++--
>  drivers/iommu/iommufd/iommufd_private.h |  1 +
>  include/uapi/linux/iommufd.h            | 12 ++++++------
>  3 files changed, 29 insertions(+), 8 deletions(-)

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

Jason