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From: Andrey Borzenkov <arvidjaar@mail.ru>
To: Ingo Molnar <mingo@elte.hu>
Cc: Eduardo Habkost <ehabkost@redhat.com>,
	Avi Kivity <avi@redhat.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Andrew Morton <akpm@osdl.org>, "Rafael J. Wysocki" <rjw@sisk.pl>,
	kexec@lists.infradead.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 15/15] Revert "x86: default to reboot via ACPI"
Date: Thu, 6 Nov 2008 18:53:05 +0300	[thread overview]
Message-ID: <200811061853.08003.arvidjaar@mail.ru> (raw)
In-Reply-To: <20081106150610.GA1644@elte.hu>

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On Thursday 06 November 2008, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@elte.hu> wrote:
> 
> > > Andrey Borzenkov's patch, for example, adds a new DMI entry 
> > > because reboot=acpi breaks his keyboard (even without KVM, I 
> > > guess). Andrey, was that the case?
> > 
> > hm, IIRC the problem was KVM in his case too.
> 
> actually, Andrey's problem seems to be unrelated. So i've queued up 
> the revert below in tip/x86/urgent for v2.6.28. Thanks guys!
> 

Yes, I do not use KVM. Actually my CPU (PIII) does not even support
virtualization.

> 	Ingo
> 
> ---------------->
> From 8d00450d296dedec9ada38d43b83e79cca6fd5a3 Mon Sep 17 00:00:00 2001
> From: Eduardo Habkost <ehabkost@redhat.com>
> Date: Tue, 4 Nov 2008 12:52:44 -0200
> Subject: [PATCH] Revert "x86: default to reboot via ACPI"
> 
> This reverts commit c7ffa6c26277b403920e2255d10df849bd613380.
> 
> the assumptio of this change was that this would not break
> any existing machine. Andrey Borzenkov reported troubles with
> the ACPI reboot method: the system would hang on reboot, necessiating
> a power cycle. Probably more systems are affected as well.
> 

To be precise - system reboots but keyboard is non-functional after that.
Power off is required to clear this condition.

I am fine with either way (revert or DMI). But if problem which ACPI
reboot fixed (or worked around) is not solved differently I think
reverting to old way is better.

> Also, there are patches queued up for v2.6.29 to disable virtualization
> on emergency_restart() - which was the original motivation of
> this change.
> 
> Reported-by: Andrey Borzenkov <arvidjaar@mail.ru>
> Bisected-by: Andrey Borzenkov <arvidjaar@mail.ru>
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> Acked-by: Avi Kivity <avi@redhat.com>
> Signed-off-by: Ingo Molnar <mingo@elte.hu>
> ---
>  arch/x86/kernel/reboot.c |    6 +-----
>  1 files changed, 1 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
> index f4c93f1..724adfc 100644
> --- a/arch/x86/kernel/reboot.c
> +++ b/arch/x86/kernel/reboot.c
> @@ -29,11 +29,7 @@ EXPORT_SYMBOL(pm_power_off);
>  
>  static const struct desc_ptr no_idt = {};
>  static int reboot_mode;
> -/*
> - * Keyboard reset and triple fault may result in INIT, not RESET, which
> - * doesn't work when we're in vmx root mode.  Try ACPI first.
> - */
> -enum reboot_type reboot_type = BOOT_ACPI;
> +enum reboot_type reboot_type = BOOT_KBD;
>  int reboot_force;
>  
>  #if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
> 
> 



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  parent reply	other threads:[~2008-11-06 15:53 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-11-05 19:56 [PATCH 00/15] x86: disable virt on kdump and emergency_restart (v2) Eduardo Habkost
2008-11-05 19:56 ` [PATCH 01/15] x86 kdump: Extract kdump-specific code from crash_nmi_callback() Eduardo Habkost
2008-11-05 19:56 ` [PATCH 02/15] x86 kdump: Move crashing_cpu assignment to nmi_shootdown_cpus() Eduardo Habkost
2008-11-05 19:56 ` [PATCH 03/15] x86 kdump: Create kdump_nmi_shootdown_cpus() Eduardo Habkost
2008-11-05 19:56 ` [PATCH 04/15] x86 kdump: Make kdump_nmi_callback() a function ptr on crash_nmi_callback() Eduardo Habkost
2008-11-05 19:56 ` [PATCH 05/15] x86 kdump: Make nmi_shootdown_cpus() non-static Eduardo Habkost
2008-11-05 19:56 ` [PATCH 06/15] x86: Move nmi_shootdown_cpus() to reboot.c Eduardo Habkost
2008-11-05 19:56 ` [PATCH 07/15] x86: Make nmi_shootdown_cpus() available on !SMP and !X86_LOCAL_APIC Eduardo Habkost
2008-11-05 19:56 ` [PATCH 08/15] x86: Disable IRQs before doing anything on nmi_shootdown_cpus() Eduardo Habkost
2008-11-05 19:56 ` [PATCH 09/15] x86: Emergency virtualization disable function Eduardo Habkost
2008-11-05 22:27   ` Pavel Machek
2008-11-06 15:34     ` Eduardo Habkost
2008-11-06 18:11       ` Pavel Machek
2008-11-05 19:56 ` [PATCH 10/15] kdump: Hook emergency_virt_disable() on crash shutdown code Eduardo Habkost
2008-11-05 19:56 ` [PATCH 11/15] x86: disable virtualization on all CPUs if needed, on emergency_restart Eduardo Habkost
2008-11-05 19:56 ` [PATCH 12/15] kvm: svm: no-parameters version of svm_hardware_disable() Eduardo Habkost
2008-11-05 19:56 ` [PATCH 13/15] kvm: svm: register virt_disable function on hardware_setup Eduardo Habkost
2008-11-05 19:56 ` [PATCH 14/15] kvm: vmx: crash_hardware_disable function Eduardo Habkost
2008-11-05 19:56 ` [PATCH 15/15] Revert "x86: default to reboot via ACPI" Eduardo Habkost
2008-11-06  7:14   ` Ingo Molnar
2008-11-06 12:40     ` Eduardo Habkost
2008-11-06 14:30       ` Ingo Molnar
2008-11-06 15:06         ` Ingo Molnar
2008-11-06 15:41           ` Eric W. Biederman
2008-11-06 15:52             ` Avi Kivity
2008-11-06 15:53           ` Andrey Borzenkov [this message]
2008-11-06 19:50             ` Len Brown
2008-11-06 21:50               ` Matthew Garrett
2008-11-06 22:17                 ` Len Brown
2008-11-06 23:24                   ` Matthew Garrett
2008-11-07  1:01                   ` Zhao Yakui
2008-11-07  0:59                     ` Matthew Garrett
2008-11-09 10:11                       ` Avi Kivity
2008-11-09 10:24                         ` Matthew Garrett
     [not found] <fa.UVpnVba3yRAWG3rGZ0sk20JE9hs@ifi.uio.no>
     [not found] ` <fa.FPBNKx3BSvZHPZ+eXD4Tb+fuRYk@ifi.uio.no>
     [not found]   ` <fa.PvVEuEo+f/t4sLmcGyN2Tsl8zYg@ifi.uio.no>
     [not found]     ` <fa.zzFdOXisTZzBaE1+ueGIYmt+Z5c@ifi.uio.no>
     [not found]       ` <fa.vQ6HVRcPFFr1zpcXFFOjEPtDdNk@ifi.uio.no>
     [not found]         ` <fa.ckUqcrtVKbxAkjNggIdajBTHr9Q@ifi.uio.no>
2008-11-07  1:30           ` Robert Hancock
2008-11-07  1:43             ` Matthew Garrett
2008-11-07  1:53               ` Len Brown
2008-11-08 22:32             ` Rafael J. Wysocki

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