[patch] KVM: T60 resume fix

Ingo Molnar
2007-03-02T10:31:09Z

Subject: [patch] KVM: T60 resume fix
From: Ingo Molnar <mingo@elte.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@elte.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;