qemu-kvm: enable get/set vcpu events on reset and migration

[Marcelo Tosatti <mtosatti@redhat.com>]

> The last two hunks will cause the same !CONFIG_KVM breakages qemu-kvm's
> mpstate used to as well. You may either fix it up temporarily or wait
> for my refactoring that is now scheduled with highest priority (should
> be ready today or tomorrow).

It needs to go in 0.12-stable, so we'll have to leave with it.

Feel free to revert from master when refactoring.

Gleb/Glauber can you review please.

----

qemu-kvm should reset and save/restore vcpu events.

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

diff --git a/kvm.h b/kvm.h
index e2a945b..9fa4e25 100644
--- a/kvm.h
+++ b/kvm.h
@@ -52,6 +52,9 @@ int kvm_set_migration_log(int enable);
 int kvm_has_sync_mmu(void);
 #endif /* KVM_UPSTREAM */
 int kvm_has_vcpu_events(void);
+int kvm_put_vcpu_events(CPUState *env);
+int kvm_get_vcpu_events(CPUState *env);
+
 #ifdef KVM_UPSTREAM
 
 void kvm_setup_guest_memory(void *start, size_t size);
@@ -96,7 +99,9 @@ int kvm_arch_init(KVMState *s, int smp_cpus);
 
 int kvm_arch_init_vcpu(CPUState *env);
 
+#endif
 void kvm_arch_reset_vcpu(CPUState *env);
+#ifdef KVM_UPSTREAM
 
 struct kvm_guest_debug;
 struct kvm_debug_exit_arch;
diff --git a/qemu-kvm-x86.c b/qemu-kvm-x86.c
index 82e362c..7f820a4 100644
--- a/qemu-kvm-x86.c
+++ b/qemu-kvm-x86.c
@@ -1457,8 +1457,9 @@ void kvm_arch_push_nmi(void *opaque)
 
 void kvm_arch_cpu_reset(CPUState *env)
 {
-    env->interrupt_injected = -1;
+    kvm_arch_reset_vcpu(env);
     kvm_arch_load_regs(env);
+    kvm_put_vcpu_events(env);
     if (!cpu_is_bsp(env)) {
 	if (kvm_irqchip_in_kernel()) {
 #ifdef KVM_CAP_MP_STATE
diff --git a/qemu-kvm.c b/qemu-kvm.c
index 1c34846..f891a3e 100644
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -2187,6 +2187,11 @@ static int kvm_create_context(void)
         return r;
     }
 
+    kvm_state->vcpu_events = 0;
+#ifdef KVM_CAP_VCPU_EVENTS
+    kvm_state->vcpu_events = kvm_check_extension(kvm_state, KVM_CAP_VCPU_EVENTS);
+#endif
+
     kvm_init_ap();
     if (kvm_irqchip) {
         if (!qemu_kvm_has_gsi_routing()) {
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 9af1e48..79be2d5 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -285,6 +285,7 @@ int kvm_arch_init_vcpu(CPUState *env)
     return kvm_vcpu_ioctl(env, KVM_SET_CPUID2, &cpuid_data);
 }
 
+#endif
 void kvm_arch_reset_vcpu(CPUState *env)
 {
     env->exception_injected = -1;
@@ -292,6 +293,7 @@ void kvm_arch_reset_vcpu(CPUState *env)
     env->nmi_injected = 0;
     env->nmi_pending = 0;
 }
+#ifdef KVM_UPSTREAM
 
 static int kvm_has_msr_star(CPUState *env)
 {
@@ -776,8 +778,9 @@ static int kvm_get_mp_state(CPUState *env)
     env->mp_state = mp_state.mp_state;
     return 0;
 }
+#endif
 
-static int kvm_put_vcpu_events(CPUState *env)
+int kvm_put_vcpu_events(CPUState *env)
 {
 #ifdef KVM_CAP_VCPU_EVENTS
     struct kvm_vcpu_events events;
@@ -807,7 +810,7 @@ static int kvm_put_vcpu_events(CPUState *env)
 #endif
 }
 
-static int kvm_get_vcpu_events(CPUState *env)
+int kvm_get_vcpu_events(CPUState *env)
 {
 #ifdef KVM_CAP_VCPU_EVENTS
     struct kvm_vcpu_events events;
@@ -844,6 +847,7 @@ static int kvm_get_vcpu_events(CPUState *env)
     return 0;
 }
 
+#ifdef KVM_UPSTREAM
 int kvm_arch_put_registers(CPUState *env)
 {
     int ret;
diff --git a/target-i386/machine.c b/target-i386/machine.c
index 47ca6e8..0b8a33a 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -323,7 +323,10 @@ static void cpu_pre_save(void *opaque)
     int i;
 
     cpu_synchronize_state(env);
-    kvm_save_mpstate(env);
+    if (kvm_enabled()) {
+        kvm_save_mpstate(env);
+        kvm_get_vcpu_events(env);
+    }
 
     /* FPU */
     env->fpus_vmstate = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
@@ -374,6 +377,7 @@ static int cpu_post_load(void *opaque, int version_id)
 
         kvm_load_tsc(env);
         kvm_load_mpstate(env);
+        kvm_put_vcpu_events(env);
     }
 
     return 0;