8 files changed, 59 insertions, 44 deletions

diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h
index e35b3a84a40b..c4b4bac3d09e 100644
--- a/arch/ia64/include/asm/kvm_host.h
+++ b/arch/ia64/include/asm/kvm_host.h
@@ -365,6 +365,7 @@ struct thash_cb {
 };
 
 struct kvm_vcpu_stat {
+        u32 halt_wakeup;
 };
 
 struct kvm_vcpu_arch {
diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index f5104b7c52cd..9d80ff8d9eff 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1872,21 +1872,6 @@ void kvm_arch_hardware_unsetup(void)
 {
 }
 
-void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
-{
-        int me;
-        int cpu = vcpu->cpu;
-
-        if (waitqueue_active(&vcpu->wq))
-                wake_up_interruptible(&vcpu->wq);
-
-        me = get_cpu();
-        if (cpu != me && (unsigned) cpu < nr_cpu_ids && cpu_online(cpu))
-                if (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests))
-                        smp_send_reschedule(cpu);
-        put_cpu();
-}
-
 int kvm_apic_set_irq(struct kvm_vcpu *vcpu, struct kvm_lapic_irq *irq)
 {
         return __apic_accept_irq(vcpu, irq->vector);
@@ -1956,6 +1941,11 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
                 (kvm_highest_pending_irq(vcpu) != -1);
 }
 
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+        return (!test_and_set_bit(KVM_REQ_KICK, &vcpu->requests));
+}
+
 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
                                     struct kvm_mp_state *mp_state)
 {
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 52eb9c1f4fe0..889383735e73 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -498,4 +498,10 @@ struct kvm_vcpu_arch {
 #define KVM_MMIO_REG_QPR        0x0040
 #define KVM_MMIO_REG_FQPR       0x0060
 
+#define __KVM_HAVE_ARCH_VCPU_GET_WQ 1
+static inline wait_queue_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
+{
+        return vcpu->arch.wqp;
+}
+
 #endif /* __POWERPC_KVM_HOST_H__ */
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 00d7e345b3fe..b5e9046462fd 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -43,6 +43,11 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
                v->requests;
 }
 
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+        return 1;
+}
+
 int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
 {
         int nr = kvmppc_get_gpr(vcpu, 11);
@@ -588,21 +593,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
         return r;
 }
 
-void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
-{
-        int me;
-        int cpu = vcpu->cpu;
-
-        me = get_cpu();
-        if (waitqueue_active(vcpu->arch.wqp)) {
-                wake_up_interruptible(vcpu->arch.wqp);
-                vcpu->stat.halt_wakeup++;
-        } else if (cpu != me && cpu != -1) {
-                smp_send_reschedule(vcpu->cpu);
-        }
-        put_cpu();
-}
-
 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 {
         if (irq->irq == KVM_INTERRUPT_UNSET) {
@@ -611,6 +601,7 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
         }
 
         kvmppc_core_queue_external(vcpu, irq);
+
         kvm_vcpu_kick(vcpu);
 
         return 0;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 217ce44395a4..d30c8350b949 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -423,6 +423,14 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
         return 0;
 }
 
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+        /* kvm common code refers to this, but never calls it */
+        BUG();
+        return 0;
+}
+
+
 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
 {
         kvm_s390_vcpu_initial_reset(vcpu);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4044ce0bf7c1..511031dcb9cc 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6403,21 +6403,9 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
                  kvm_cpu_has_interrupt(vcpu));
 }
 
-void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
 {
-        int me;
-        int cpu = vcpu->cpu;
-
-        if (waitqueue_active(&vcpu->wq)) {
-                wake_up_interruptible(&vcpu->wq);
-                ++vcpu->stat.halt_wakeup;
-        }
-
-        me = get_cpu();
-        if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
-                if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE)
-                        smp_send_reschedule(cpu);
-        put_cpu();
+        return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
 }
 
 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 3a2cea616283..5b624e1ff814 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -439,6 +439,7 @@ void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
                              gfn_t gfn);
 
 void kvm_vcpu_block(struct kvm_vcpu *vcpu);
+void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
 void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
 void kvm_resched(struct kvm_vcpu *vcpu);
 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
@@ -507,6 +508,7 @@ int kvm_arch_hardware_setup(void);
 void kvm_arch_hardware_unsetup(void);
 void kvm_arch_check_processor_compat(void *rtn);
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);
 
 void kvm_free_physmem(struct kvm *kvm);
 
@@ -522,6 +524,13 @@ static inline void kvm_arch_free_vm(struct kvm *kvm)
 }
 #endif
 
+#ifndef __KVM_HAVE_ARCH_VCPU_GET_WQ
+static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
+{
+        return &vcpu->wq;
+}
+#endif
+
 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
 void kvm_arch_destroy_vm(struct kvm *kvm);
 void kvm_free_all_assigned_devices(struct kvm *kvm);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a9565e240636..7149a2e65524 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1514,6 +1514,28 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
         finish_wait(&vcpu->wq, &wait);
 }
 
+/*
+ * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
+ */
+void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
+{
+        int me;
+        int cpu = vcpu->cpu;
+        wait_queue_head_t *wqp;
+
+        wqp = kvm_arch_vcpu_wq(vcpu);
+        if (waitqueue_active(wqp)) {
+                wake_up_interruptible(wqp);
+                ++vcpu->stat.halt_wakeup;
+        }
+
+        me = get_cpu();
+        if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
+                if (kvm_arch_vcpu_should_kick(vcpu))
+                        smp_send_reschedule(cpu);
+        put_cpu();
+}
+
 void kvm_resched(struct kvm_vcpu *vcpu)
 {
         if (!need_resched())