linux-kernel - Re: [PATCH v2 3/5] vfio/iommu_type1: Remove the domain->ops comparison

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Message-ID: <YqutYjgtFOTXCF0+@Asurada-Nvidia>
Date:   Thu, 16 Jun 2022 15:23:30 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
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Subject: Re: [PATCH v2 3/5] vfio/iommu_type1: Remove the domain->ops
 comparison

On Thu, Jun 16, 2022 at 06:40:14AM +0000, Tian, Kevin wrote:

> > The domain->ops validation was added, as a precaution, for mixed-driver
> > systems. However, at this moment only one iommu driver is possible. So
> > remove it.
> 
> It's true on a physical platform. But I'm not sure whether a virtual platform
> is allowed to include multiple e.g. one virtio-iommu alongside a virtual VT-d
> or a virtual smmu. It might be clearer to claim that (as Robin pointed out)
> there is plenty more significant problems than this to solve instead of simply
> saying that only one iommu driver is possible if we don't have explicit code
> to reject such configuration. 😊

Will edit this part. Thanks!