Re: [RFC] /dev/ioasid uAPI proposal

[Paolo Bonzini]

On 09/06/21 13:57, Jason Gunthorpe wrote:
> On Wed, Jun 09, 2021 at 02:49:32AM +0000, Tian, Kevin wrote:
>
> > Last unclosed open. Jason, you dislike symbol_get in this contract per
> > earlier comment. As Alex explained, looks it's more about module
> > dependency which is orthogonal to how this contract is designed. What
> > is your opinion now?
>
> Generally when you see symbol_get like this it suggests something is
> wrong in the layering..
>
> Why shouldn't kvm have a normal module dependency on drivers/iommu?

It allows KVM to load even if there's an "install /bin/false" for vfio 
(typically used together with the blacklist directive) in modprobe.conf. 
 This rationale should apply to iommu as well.

Paolo