[Bug 208767] kernel stack overflow due to Lazy update IOAPIC on an x86_64 *host*, when gpu is passthrough to macos guest vm

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https://bugzilla.kernel.org/show_bug.cgi?id=208767

--- Comment #5 from Yani Stoyanov (yaweb@xxxxxxx) ---
(In reply to Jim Mattson from comment #4)
> On Sun, Aug 2, 2020 at 2:01 AM <bugzilla-daemon@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> > https://bugzilla.kernel.org/show_bug.cgi?id=208767
> >
> >             Bug ID: 208767
> >            Summary: kernel stack overflow due to Lazy update IOAPIC on an
> >                     x86_64 *host*, when gpu is passthrough to macos guest
> >                     vm
> >            Product: Virtualization
> >            Version: unspecified
> >     Kernel Version: 5.6 up to and including 5.7
> >           Hardware: All
> >                 OS: Linux
> >               Tree: Mainline
> >             Status: NEW
> >           Severity: normal
> >           Priority: P1
> >          Component: kvm
> >           Assignee: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx
> >           Reporter: yaweb@xxxxxxx
> >         Regression: No
> >
> > I have fedora 32 host with latest kernel on a double xeon v5 2630
> workstation
> > asus board and few vm with assigned gpus to them (linux windows and macos).
> 
> I didn't think the Mac OS X license agreement permitted running it on
> non-Apple hardware. Has this changed?

Jim Mattson, I guess official it is not support by as I wrote in the
description of the issue the problem is in the mentioned function. I tested it
and if comment the lines 

if (edge && kvm_apicv_activated(ioapic->kvm))
ioapic_lazy_update_eoi(ioapic, irq);

It boots fine, if the function invocation is not commented I kernel stack
overflow so the bug is for it it should not matter what case it right?

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