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From: Michal Necasek <>
To: <>
Cc: <>, <>,
	<>, <>,
	<>, <>
Subject: Re: 4.8.2 not booting in 32-bit VM without I/O-APIC
Date: Fri, 28 Oct 2016 11:52:56 -0700 (PDT)	[thread overview]
Message-ID: <6f385a6a-1f22-4be7-8005-28b714ca271a@default> (raw)

     Hi Thomas,

 Sorry if I wasn't clear. No, it doesn't work for us. The ff8560512b8d commit fixes the APIC poking on machines where there is no local APIC available (and thus fixes the committer's machine), but it doesn't work in our case, where there is a local APIC but no I/O APIC, no ACPI MADT, and no MP tables. 

 In other words, for us boot_cpu_has(X86_FEATURE_APIC) is true but the APIC has not been set up yet because init_apic_mappings() hasn't been run.


----- Original Message -----
Sent: Friday, October 28, 2016 8:41:46 PM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: 4.8.2 not booting in 32-bit VM without I/O-APIC

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?



             reply	other threads:[~2016-10-28 18:53 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-28 18:52 Michal Necasek [this message]
2016-10-28 19:00 ` Thomas Gleixner
2016-10-28 19:34   ` Thomas Gleixner
2016-10-29 10:18     ` Borislav Petkov
2016-10-29 12:04     ` [tip:x86/urgent] x86/smpboot: Init apic mapping before usage tip-bot for Thomas Gleixner
2016-10-29 12:06     ` tip-bot for Thomas Gleixner
  -- strict thread matches above, loose matches on Subject: below --
2016-11-03 20:02 4.8.2 not booting in 32-bit VM without I/O-APIC Michal Necasek
2016-11-10 14:21 ` Michael Thayer
2016-11-10 17:18   ` Thomas Gleixner
2016-10-28 18:30 Michal Necasek
2016-10-28 18:38 ` Thomas Gleixner

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