[patch 5/7] qemu: kvm: unhalt vcpu0 on pit irq

[Marcelo Tosatti <mtosatti@redhat.com>]

[-- Attachment #1: pic-unhalt-cpu0 --]
[-- Type: text/plain, Size: 1990 bytes --]

Since the introduction of the IO thread host_alarm_handler() fails to
wakeup vcpu0 when a timer is triggered. This results in failure to take
vcpu0 out of halt in C2 emulation.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: kvm-userspace.tip/qemu/hw/i8259.c
===================================================================
--- kvm-userspace.tip.orig/qemu/hw/i8259.c
+++ kvm-userspace.tip/qemu/hw/i8259.c
@@ -83,6 +83,8 @@ static inline void pic_set_irq1(PicState
         if (level) {
             s->irr |= mask;
             s->last_irr |= mask;
+            if (kvm_enabled())
+                kvm_unhalt_cpu0();
         } else {
             s->irr &= ~mask;
             s->last_irr &= ~mask;
@@ -93,6 +95,8 @@ static inline void pic_set_irq1(PicState
             if ((s->last_irr & mask) == 0)
                 s->irr |= mask;
             s->last_irr |= mask;
+            if (kvm_enabled())
+                kvm_unhalt_cpu0();
         } else {
             s->last_irr &= ~mask;
         }
Index: kvm-userspace.tip/qemu/qemu-kvm.c
===================================================================
--- kvm-userspace.tip.orig/qemu/qemu-kvm.c
+++ kvm-userspace.tip/qemu/qemu-kvm.c
@@ -128,6 +128,12 @@ static void on_vcpu(CPUState *env, void 
         qemu_cond_wait(&qemu_work_cond);
 }
 
+void kvm_unhalt_cpu0(void)
+{
+    if (vcpu_info[0].thread)
+        vcpu_info[0].env->halted = 0;
+}
+
 void kvm_update_interrupt_request(CPUState *env)
 {
     int signal = 0;
Index: kvm-userspace.tip/qemu/qemu-kvm.h
===================================================================
--- kvm-userspace.tip.orig/qemu/qemu-kvm.h
+++ kvm-userspace.tip/qemu/qemu-kvm.h
@@ -30,6 +30,7 @@ int kvm_qemu_init_env(CPUState *env);
 int kvm_qemu_check_extension(int ext);
 void kvm_apic_init(CPUState *env);
 int kvm_set_irq(int irq, int level);
+void kvm_unhalt_cpu0(void);
 
 int kvm_physical_memory_set_dirty_tracking(int enable);
 int kvm_update_dirty_pages_log(void);

--