Re: [PATCH 06/10] vfio-iommufd: Allow iommufd to be used in place of a container fd

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On Tue, Nov 01, 2022 at 02:19:04AM -0700, Nicolin Chen wrote:
> On Tue, Nov 01, 2022 at 08:09:52AM +0000, Tian, Kevin wrote:
> 
> > > From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> > > Sent: Wednesday, October 26, 2022 2:51 AM
> > >
> > >  menuconfig VFIO
> > >       tristate "VFIO Non-Privileged userspace driver framework"
> > >       select IOMMU_API
> > > +     depends on IOMMUFD || !IOMMUFD
> > 
> > Out of curiosity. What is the meaning of this dependency claim?
> 
> "is it a module or not" -- from https://lwn.net/Articles/683476/

Yes, it is the kconfig pattern for "This symbol optionally uses the
other symbol, and if the other symbol is turned on then it has to be
the right y/m value"

ie rejects vfio being built-in but iommufd being a module

Jason



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