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Date: Fri, 28 Oct 2016 20:38:02 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Michal Necasek <michal.necasek@oracle.com>
cc: linux-kernel@vger.kernel.org, prarit@redhat.com,
        ville.syrjala@linux.intel.com, michael.thayer@oracle.com,
        frank.mehnert@oracle.com, knut.osmundsen@oracle.com
Subject: Re: 4.8.2 not booting in 32-bit VM without I/O-APIC
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On Fri, 28 Oct 2016, Michal Necasek wrote: 

> I suspect that either init_apic_mappings() needs to be called earlier or
> the initial fix from commit 2a51fe08 needs to be done later.

Linus tree has a fix for this:

ff8560512b8d x86/boot/smp: Don't try to poke disabled/non-existent APIC

It's on the way to stable as well. Can you try whether that works for you?

Thanks,

	tglx