linux-kernel - [patch] KVM: T60 resume fix

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Message-ID: <20070302102216.GA13575@elte.hu>
Date:	Fri, 2 Mar 2007 11:22:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jens Axboe <jens.axboe@...cle.com>, Pavel Machek <pavel@....cz>,
	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Thomas Gleixner <tglx@...utronix.de>, linux-pm@...ts.osdl.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Daniel Walker <dwalker@...sta.com>,
	Len Brown <lenb@...nel.org>, git@...r.kernel.org,
	Avi Kivity <avi@...ranet.com>
Subject: [patch] KVM: T60 resume fix

Subject: [patch] KVM: T60 resume fix
From: Ingo Molnar <mingo@...e.hu>

my T60 laptop does not resume correctly due to KVM attempting to send an 
IPI to a CPU that might be down (or not up yet). (Doing so also triggers 
the send_IPI_mask_bitmask() warning in arch/i386/kernel/smp.c, line 
732.)

with this fix applied my laptop does not hang during resume.

[ KVM will have to disable/enable virtualization on the CPU itself that
  goes down / comes up, not via an IPI sent from the requesting CPU. ]

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 drivers/kvm/kvm_main.c |    6 ------
 1 file changed, 6 deletions(-)

Index: linux/drivers/kvm/kvm_main.c
===================================================================
--- linux.orig/drivers/kvm/kvm_main.c
+++ linux/drivers/kvm/kvm_main.c
@@ -2083,12 +2083,6 @@ static int kvm_cpu_hotplug(struct notifi
 	case CPU_DEAD:
 	case CPU_UP_CANCELED:
 		decache_vcpus_on_cpu(cpu);
-		smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
-					 NULL, 0, 1);
-		break;
-	case CPU_UP_PREPARE:
-		smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
-					 NULL, 0, 1);
 		break;
 	}
 	return NOTIFY_OK;
-
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