Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
cpus-common.c | 25 +++++++++++++++++++++++++
include/qom/cpu.h | 12 ++++++++++++
2 files changed, 37 insertions(+)
diff --git a/cpus-common.c b/cpus-common.c
index 59c8dc8..88cf5ec 100644
--- a/cpus-common.c
+++ b/cpus-common.c
@@ -144,6 +144,11 @@ void async_run_on_cpu(CPUState *cpu, run_on_cpu_func func,
void *data)
queue_work_on_cpu(cpu, wi);
}
+typedef struct SafeWorkItem {
+ run_on_cpu_func func;
+ void *data;
+} SafeWorkItem;
+
/* Wait for pending exclusive operations to complete. The exclusive lock
must be held. */
static inline void exclusive_idle(void)
@@ -208,6 +213,26 @@ void cpu_exec_end(CPUState *cpu)
qemu_mutex_unlock(&qemu_cpu_list_mutex);
}
+static void async_safe_run_on_cpu_fn(CPUState *cpu, void *data)
+{
+ SafeWorkItem *w = data;
+
+ start_exclusive();
+ w->func(cpu, w->data);
+ end_exclusive();
+ g_free(w);
+}
+
+void async_safe_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data)
+{
+ SafeWorkItem *w = g_new(SafeWorkItem, 1);
+
+ w->func = func;
+ w->data = data;
+
+ async_run_on_cpu(cpu, async_safe_run_on_cpu_fn, w);
+}
+
void process_queued_cpu_work(CPUState *cpu)
{
struct qemu_work_item *wi;
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 0e04e8f..54a875e 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -663,6 +663,18 @@ void run_on_cpu(CPUState *cpu, run_on_cpu_func func, void
*data);
void async_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data);
/**
+ * async_safe_run_on_cpu:
+ * @cpu: The vCPU to run on.
+ * @func: The function to be executed.
+ * @data: Data to pass to the function.
+ *
+ * Schedules the function @func for execution on the vCPU @cpu asynchronously,
+ * while all other vCPUs are sleeping. @func is called with the CPU list lock
+ * taken (and for system emulation the BQL); any other lock can be taken
safely.
+ */
+void async_safe_run_on_cpu(CPUState *cpu, run_on_cpu_func func, void *data);
+
+/**
* qemu_get_cpu:
* @index: The CPUState@cpu_index value of the CPU to obtain.
*
--
2.7.4
