Re: [PATCH v8 07/15] iommufd/viommu: Keep a reference to the KVM file

[sashiko-bot@kernel.org]

> From: Nicolin Chen <nicolinc@nvidia.com>
> 
> The TSM vDevice operations need access to the KVM associated with the
> device's vIOMMU. Save the device's KVM file in the iommufd_viommu when the
> vIOMMU is allocated, and take a file reference so it remains valid for the
> lifetime of the vIOMMU.
> 
> Release the reference when the vIOMMU is destroyed.
> 
> Reject vdevice allocation when the device's KVM association differs from
> the vIOMMU's, including when only one has a KVM association. Allow
> allocation when both associations are NULL.
> 
> Based on an original patch by
> Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> 
> [nicolinc: hold kvm's users_count]
> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> [aneesh.kumar: Switch to use kvm_file]
> Cc: Jason Gunthorpe <jgg@ziepe.ca>
> Cc: Kevin Tian <kevin.tian@intel.com>
> Cc: Joerg Roedel <joro@8bytes.org>
> Cc: Will Deacon <will@kernel.org>
> Cc: Robin Murphy <robin.murphy@arm.com>
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261104161632.3547423-1-aneesh.kumar@kernel.org?part=7