[PATCH 18/37] Introduce VCPU self-signaling service

Marcelo Tosatti
2011-02-14T15:25:10Z

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@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
cpus.c | 21 +++++++++++++++++++++
qemu-common.h | 1 +
2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/cpus.c b/cpus.c
index 9a3fc31..6a85dc8 100644
--- a/cpus.c
+++ b/cpus.c
@@ -529,6 +529,17 @@ 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;
@@ -831,6 +842,16 @@ 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 */
--
1.7.4