[PATCH] KVM: Wrap kvm_{gfn,hva}_range.pte in a per-action union

[Yu Zhao]

On Fri, Jul 28, 2023 at 6:41 PM Sean Christopherson <seanjc at google.com> wrote:
>
> Wrap kvm_{gfn,hva}_range.pte in a union so that future notifier events can
> pass event specific information up and down the stack without needing to
> constantly expand and churn the APIs.  Lockless aging of SPTEs will pass
> around a bitmap, and support for memory attributes will pass around the
> new attributes for the range.
>
> Add a "KVM_NO_ARG" placeholder to simplify handling events without an
> argument (creating a dummy union variable is midly annoying).
>
> Opportunstically drop explicit zero-initialization of the "pte" field, as
> omitting the field (now a union) has the same effect.
>
> Cc: Yu Zhao <yuzhao at google.com>
> Link: https://lore.kernel.org/all/CAOUHufagkd2Jk3_HrVoFFptRXM=hX2CV8f+M-dka-hJU4bP8kw@mail.gmail.com
> Signed-off-by: Sean Christopherson <seanjc at google.com>

Acked-by: Yu Zhao <yuzhao at google.com>