[PATCH] KVM: don't sent IPI if the vcpu is not online

[Xiao Guangrong]

It's no need sent IPI to the vcpu which is schedule out

Signed-off-by: Xiao Guangrong <xiaoguangr...@cn.fujitsu.com>
---
 include/linux/kvm_host.h |    1 +
 virt/kvm/kvm_main.c      |    5 ++++-
 2 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index f2ecdd5..a2682cf 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -86,6 +86,7 @@ struct kvm_vcpu {
        unsigned long requests;
        unsigned long guest_debug;
        int srcu_idx;
+       bool online;
 
        int fpu_active;
        int guest_fpu_loaded, guest_xcr0_loaded;
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 9a73b98..998cbc8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -148,8 +148,9 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned 
int req)
        raw_spin_lock(&kvm->requests_lock);
        me = smp_processor_id();
        kvm_for_each_vcpu(i, vcpu, kvm) {
-               if (kvm_make_check_request(req, vcpu))
+               if (kvm_make_check_request(req, vcpu) || !vcpu->online)
                        continue;
+
                cpu = vcpu->cpu;
                if (cpus != NULL && cpu != -1 && cpu != me)
                        cpumask_set_cpu(cpu, cpus);
@@ -2245,6 +2246,7 @@ static void kvm_sched_in(struct preempt_notifier *pn, int 
cpu)
 {
        struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
 
+       vcpu->online = true;
        kvm_arch_vcpu_load(vcpu, cpu);
 }
 
@@ -2253,6 +2255,7 @@ static void kvm_sched_out(struct preempt_notifier *pn,
 {
        struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
 
+       vcpu->online = false;
        kvm_arch_vcpu_put(vcpu);
 }
 
-- 
1.7.0.4
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