accel/qtest: Support qtest accelerator for Windows

Currently signal SIGIPI [=SIGUSR1] is used to kick the dummy CPU
when qtest accelerator is used. However SIGUSR1 is unsupported on
Windows. To support Windows, we add a QemuSemaphore CPUState::sem
to kick the dummy CPU instead for Windows.

Signed-off-by: Xuzhou Cheng <xuzhou.cheng@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20221028045736.679903-2-bin.meng@windriver.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/accel/dummy-cpus.c b/accel/dummy-cpus.c
index 10429fdfb2..d6a1b8d0a2 100644
--- a/accel/dummy-cpus.c
+++ b/accel/dummy-cpus.c
@@ -21,8 +21,6 @@
 static void *dummy_cpu_thread_fn(void *arg)
 {
     CPUState *cpu = arg;
-    sigset_t waitset;
-    int r;
 
     rcu_register_thread();
 
@@ -32,8 +30,13 @@ static void *dummy_cpu_thread_fn(void *arg)
     cpu->can_do_io = 1;
     current_cpu = cpu;
 
+#ifndef _WIN32
+    sigset_t waitset;
+    int r;
+
     sigemptyset(&waitset);
     sigaddset(&waitset, SIG_IPI);
+#endif
 
     /* signal CPU creation */
     cpu_thread_signal_created(cpu);
@@ -41,6 +44,7 @@ static void *dummy_cpu_thread_fn(void *arg)
 
     do {
         qemu_mutex_unlock_iothread();
+#ifndef _WIN32
         do {
             int sig;
             r = sigwait(&waitset, &sig);
@@ -49,6 +53,9 @@ static void *dummy_cpu_thread_fn(void *arg)
             perror("sigwait");
             exit(1);
         }
+#else
+        qemu_sem_wait(&cpu->sem);
+#endif
         qemu_mutex_lock_iothread();
         qemu_wait_io_event(cpu);
     } while (!cpu->unplug);
@@ -69,4 +76,7 @@ void dummy_start_vcpu_thread(CPUState *cpu)
              cpu->cpu_index);
     qemu_thread_create(cpu->thread, thread_name, dummy_cpu_thread_fn, cpu,
                        QEMU_THREAD_JOINABLE);
+#ifdef _WIN32
+    qemu_sem_init(&cpu->sem, 0);
+#endif
 }