Re: [PATCH 1/3] KVM: VMX: Retry APIC-access page reload if invalidation is in-progress

[Sean Christopherson]

On Tue, Jun 06, 2023, Alistair Popple wrote:
> 
> Thanks for doing this. I'm not overly familiar with KVM implementation
> but am familiar with mmu notifiers so read through the KVM usage. Looks
> like KVM is sort of doing something similar to what mmu_interval_notifiers
> do and I wonder if some of that could be shared.

They're very, very similar.  At a glance, KVM likely could be moved over to the
common interval tree implementation, but it would require a substantial amount of
work in KVM, and various extensions to the mmu notifiers too.  I definitely wouldn't
be opposed to converging KVM if someone wants to put in the effort, but at the same
time I wouldn't recommend that anyone actually do the work as the ROI is likely
very low.