Subject: [patch] KVM: T60 resume fix

From: Ingo Molnar <[email-masked]>
Date: Fri, 2 Mar 2007 11:22:16 +0100

Subject: [patch] KVM: T60 resume fix
From: Ingo Molnar <[email-masked]>

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 <[email-masked]>
---
 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;