RE: [PATCH v1 0/3] udmabuf: Add support for page migration out of movable zone or CMA

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Hi David,

> >> I think it makes sense to have a generic (non-GUP) version of
> >> check_and_migrate_movable_pages() available in migration.h that
> >> drivers can use to ensure that they don't break memory hotunplug
> >> accidentally.
> >
> > Definately not.
> >
> > Either use the VMA and pin_user_pages(), or implement
> > pin_user_pages_fd() in core code.
> >
> > Do not open code something wonky in drivers.
> 
> Agreed. pin_user_pages_fd() might become relevant in the context of
> vfio/mdev + KVM gmem -- don't mmap guest memory but instead provide it
> via a special memfd to the kernel.
> 
> So there might be value in having such a core infrastructure.
Ok, I'll work on adding pin_user_pages_fd() soon.

Thanks,
Vivek
> 
> --
> Cheers,
> 
> David / dhildenb





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