linux-kernel - Re: [PATCH] x86/ACPI: Make Sony Vaio Z1 series to use "reboot=pci" default

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Date:	Tue, 19 Nov 2013 08:03:39 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Adam Williamson <awilliam@...hat.com>
Cc:	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Lan Tianyu <tianyu.lan@...el.com>,
	Matthew Garrett <mjg@...hat.com>, Peter Anvin <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Robin Holt <holt@....com>, davej@...oraproject.org,
	Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86/ACPI: Make Sony Vaio Z1 series to use "reboot=pci"
 default


* Adam Williamson <awilliam@...hat.com> wrote:

> On Fri, 2013-11-01 at 15:02 +0100, Joerg Roedel wrote:
> > On Sun, Oct 27, 2013 at 12:06:29AM -0700, Adam Williamson wrote:
> > > On Sat, 2013-10-26 at 11:15 +0200, Ingo Molnar wrote:
> > > >   CONFIG_IRQ_REMAP=y
> > > 
> > > Agh, sorry - I had this down in my mind as a boot time 
> > > parameter, not a compile time option. I'm off on vacation for a 
> > > week in the morning, and it's too late to wait around for a 
> > > kernel compile tonight :/ So I'll have to check this one when I 
> > > get back. Sorry again.
> > 
> > Note, instead of recompiling the kernel, you can also pass 
> > 'intremap=off' on the kernel cmdline to disable interrupt 
> > remapping and test with that.
> 
> Sorry for the delay, folks - just got back to this. Booting with 
> 'intremap=off' results in a slow reboot, i.e., doesn't fix the bug. 
> Is that a sufficient test, Ingo, or do you still want me to build 
> with CONFIG_IRQ_REMAP=n and try that?

That should be a sufficient boot I suspect.

Can you disable virtualization in the BIOS - does that affect reboot 
speed?

I'm just shooting into the dark here - if you can make your system 
boot bzImages then you might as well be better off trying to bisect 
it.

On Fedora booting bzImages of vanilla kernels is reasonably 
straightforward: a 'make localconfig' done while you are booted into a 
Fedora kernel ought to pick up everything into your .config and you 
won't need any modules to be able to boot up to userspace. That should 
ease bisection.

Thanks,

	Ingo
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