Re: [PATCH 2/3] KVM: x86: Fix a semi theoretical bug in kvm_arch_async_page_present_queued

[Sean Christopherson]

On Thu, Oct 30, 2025, mlevitsk@xxxxxxxxxx wrote:
> On Mon, 2025-10-27 at 08:00 -0700, Sean Christopherson wrote:
> > On Tue, Sep 23, 2025, Sean Christopherson wrote:
> > > On x86, the "page ready" IRQ is only injected from vCPU context, so AFAICT nothing
> > > is guarnateed wake the vCPU in the above sequence.
> > 
> > Gah, KVM checks async_pf.done instead of the request.  So I don't think there's
> > a bug, just weird code.
> 
> Hi!
> 
> Note that I posted a v2 of this patch series.

I got 'em, and looked at them in depth (which is how I figured out the above
weirdness with async_pf.done).  They're sitting in my "for_next" folder, I just
haven't spent any time on applying+testing upstream patches this week (I expect
to get to your series tomorrow, or early next week).

> Do I need to drop this patch or its better to keep it (the patch should still
> be correct, but maybe an overkill I think).

It's probably overkill, but there's no real downside, so I'm inclined to apply
the v2 version (and am planning on doing so).