[Bug 207489] Kernel panic due to Lazy update IOAPIC EOI on an x86_64 *host*, when two (or more) PCI devices from different IOMMU groups are passed to Windows 10 guest, upon guest boot into Windows, with more than 4 VCPUs

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https://bugzilla.kernel.org/show_bug.cgi?id=207489

--- Comment #8 from Pol Van Aubel (linux-kernel@xxxxxxxxxxxxxxx) ---
Yes, that does seem to fix it.

Though I must admit I'm a bit wary about lines 196-199 of that patch, that
looks suspiciously preemptible. I'm not a kernel expert in any way, shape, or
form, so I'm not sure whether preemption is even of any concern here; but is
there a reason for not using atomic_cmpxchg there instead of separate
atomic_read and atomic_inc?

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