[Qemu-devel] [PATCH] Provide a general purpose way of probing if cpus are stopped

[Glauber Costa <glommer@redhat.com>]

We don't have anything that requires that in tree yet, but avi does.
So Let's be nice with him, and provide him with those functions that diminish
the amount of kvm-specific code.

Signed-off-by: Glauber Costa <glommer@redhat.com>
---
 cpu-all.h |    3 +++
 exec.c    |   22 ++++++++++++++++++++++
 2 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/cpu-all.h b/cpu-all.h
index df3aa2e..6801938 100644
--- a/cpu-all.h
+++ b/cpu-all.h
@@ -741,6 +741,9 @@ int page_get_flags(target_ulong address);
 void page_set_flags(target_ulong start, target_ulong end, int flags);
 int page_check_range(target_ulong start, target_ulong len, int flags);
 
+int qemu_cpu_stopped(CPUState *env);
+uint32_t qemu_cpus_running(void);
+
 void cpu_exec_init_all(unsigned long tb_size);
 CPUState *cpu_copy(CPUState *env);
 CPUState *qemu_get_cpu(int cpu);
diff --git a/exec.c b/exec.c
index d6e5d3c..2e5f05a 100644
--- a/exec.c
+++ b/exec.c
@@ -32,6 +32,7 @@
 #include <unistd.h>
 #include <inttypes.h>
 
+#include "sysemu.h"
 #include "cpu.h"
 #include "exec-all.h"
 #include "qemu-common.h"
@@ -558,6 +559,27 @@ CPUState *qemu_get_cpu(int cpu)
     return env;
 }
 
+int qemu_cpu_stopped(CPUState *env)
+{
+    return !vm_running || env->stopped;
+}
+
+/* Returns the number of cpus that are in the stopped state.
+ * It is a 32-bit value, because if it weren't SGI would */
+uint32_t qemu_cpus_running(void)
+{
+    uint32_t count = 0;
+
+    if (!vm_running)
+        return count;
+
+    CPUState *penv = first_cpu;
+    while (penv) {
+        count += !penv->stopped;
+    }
+    return count;
+}
+
 void cpu_exec_init(CPUState *env)
 {
     CPUState **penv;
-- 
1.6.2.2