Subject: [patch] KVM: T60 resume fix From: Ingo Molnar <mingo at 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 at 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;
