Re: [PATCH v11 0/8] KVM: allow mapping non-refcounted pages

[Christoph Hellwig]

On Mon, Mar 18, 2024 at 02:10:55PM +0100, Paolo Bonzini wrote:
> Another possibility is to have a double-underscore version that allows
> FOLL_GET, and have the "clean" kvm_follow_pfn() forbid it. So you
> would still have the possibility to convert to __kvm_follow_pfn() with
> FOLL_GET first, and then when you remove the refcount you switch to
> kvm_follow_pfn().

That does sound much better.  Then again anything that actually wants
pages (either for a good reason or historic reasons) really should be
using get/pin_user_pages anyway and not use follow_pte.