linux-kernel - Re: [PATCH v6 3/7] iommu: Validate that devices match domains

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Date:   Tue, 21 Nov 2023 14:52:32 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     joro@...tes.org, will@...nel.org, iommu@...ts.linux.dev,
        baolu.lu@...ux.intel.com, linux-kernel@...r.kernel.org,
        jsnitsel@...hat.com
Subject: Re: [PATCH v6 3/7] iommu: Validate that devices match domains

On Tue, Nov 21, 2023 at 06:03:59PM +0000, Robin Murphy wrote:
> Before we can allow drivers to coexist, we need to make sure that one
> driver's domain ops can't misinterpret another driver's dev_iommu_priv
> data. To that end, add a token to the domain so we can remember how it
> was allocated - for now this may as well be the device ops, since they
> still correlate 1:1 with drivers. We can trust ourselves for internal
> default domain attachment, so add checks to cover all the public attach
> interfaces.
> 
> Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>
> Signed-off-by: Robin Murphy <robin.murphy@....com>
> 
> ---
> 
> v4: Cover iommu_attach_device_pasid() as well, and improve robustness
>     against theoretical attempts to attach a noiommu group.
> v6: Cover new iommu_domain_alloc_user() sites as well. I don't entirely
>     dislike the idea of tying this into the domain ops, but I'd rather
>     do the simple thing for now and revisit that in future, since domain
>     ops also deserve some other cleanup.

Looks good

Jason