linux-kernel - [PATCH] kvm: do not need hardware_disable when CPU_UP

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Date:	Sat, 17 Apr 2010 17:00:19 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org
Subject: [PATCH] kvm: do not need hardware_disable when CPU_UP_CANCELED


When CPU_UP_CANCELED, hardware_enable() has not been called at the CPU
which is going up because raw_notifier_call_chain(CPU_ONLINE)
has not been called for this cpu.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5a0cd19..b03f863 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1921,11 +1921,6 @@ static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
 		       cpu);
 		hardware_disable(NULL);
 		break;
-	case CPU_UP_CANCELED:
-		printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
-		       cpu);
-		smp_call_function_single(cpu, hardware_disable, NULL, 1);
-		break;
 	case CPU_ONLINE:
 		printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
 		       cpu);



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