[PATCH 18/23] Introduce VCPU self-signaling service

[Marcelo Tosatti <mtosatti@xxxxxxxxxx>]

From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>

Introduce qemu_cpu_kick_self to send SIG_IPI to the calling VCPU
context. First user will be kvm.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
---
 cpus.c        |   21 +++++++++++++++++++++
 qemu-common.h |    1 +
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/cpus.c b/cpus.c
index c4c5914..9c50a34 100644
--- a/cpus.c
+++ b/cpus.c
@@ -537,6 +537,17 @@ void qemu_cpu_kick(void *env)
     return;
 }
 
+void qemu_cpu_kick_self(void)
+{
+#ifndef _WIN32
+    assert(cpu_single_env);
+
+    raise(SIG_IPI);
+#else
+    abort();
+#endif
+}
+
 void qemu_notify_event(void)
 {
     CPUState *env = cpu_single_env;
@@ -835,6 +846,16 @@ void qemu_cpu_kick(void *_env)
     }
 }
 
+void qemu_cpu_kick_self(void)
+{
+    assert(cpu_single_env);
+
+    if (!cpu_single_env->thread_kicked) {
+        qemu_thread_signal(cpu_single_env->thread, SIG_IPI);
+        cpu_single_env->thread_kicked = true;
+    }
+}
+
 int qemu_cpu_self(void *_env)
 {
     CPUState *env = _env;
diff --git a/qemu-common.h b/qemu-common.h
index c7ff280..a4d9c21 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -288,6 +288,7 @@ void qemu_notify_event(void);
 
 /* Unblock cpu */
 void qemu_cpu_kick(void *env);
+void qemu_cpu_kick_self(void);
 int qemu_cpu_self(void *env);
 
 /* work queue */
-- 
1.7.2.3

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