linux-kernel - Re: [PATCH 3/4] iommu: Introduce IOMMU call-back for processing struct KVM assigned to VFIO

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Date:   Fri, 13 Jan 2023 11:35:46 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Cc:     linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
        joro@...tes.org, robin.murphy@....com, ashish.kalra@....com,
        thomas.lendacky@....com, vasant.hegde@....com, jon.grimm@....com
Subject: Re: [PATCH 3/4] iommu: Introduce IOMMU call-back for processing
 struct KVM assigned to VFIO

On Tue, Jan 10, 2023 at 08:31:36AM -0600, Suravee Suthikulpanit wrote:
> Currently, VFIO provide an kvm_vfio_file_set_kvm() interface for assigning
> a KVM structure to a VFIO group. The information in struct KVM is also
> useful for IOMMU drivers when setting up VFIO domain.
> 
> Introduce struct iommu_domain_ops.set_kvm call-back function to allow
> IOMMU drivers to provide call-back to process the struct KVM
> assigned.

Also NAK

Connecting the iommu driver to KVM has to be properly architected
though iommufd.

> @@ -1652,6 +1652,7 @@ void vfio_file_set_kvm(struct file *file, struct kvm *kvm)
>  
>  	mutex_lock(&group->group_lock);
>  	group->kvm = kvm;
> +	iommu_set_kvm(group->iommu_group, kvm);
>  	mutex_unlock(&group->group_lock);
>  }

This also has obvious lifetime bugs

Jason