[Qemu-devel] [PATCH v3 03/50] cpu: introduce cpu_in_exclusive_work_context()

[Alex Bennée]

From: "Emilio G. Cota" <address@hidden>

Suggested-by: Alex Bennée <address@hidden>
Reviewed-by: Alex Bennée <address@hidden>
Signed-off-by: Emilio G. Cota <address@hidden>
---
 cpus-common.c     |  2 ++
 include/qom/cpu.h | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/cpus-common.c b/cpus-common.c
index 3ca58c64e8..960058457a 100644
--- a/cpus-common.c
+++ b/cpus-common.c
@@ -335,7 +335,9 @@ void process_queued_cpu_work(CPUState *cpu)
              */
             qemu_mutex_unlock_iothread();
             start_exclusive();
+            cpu->in_exclusive_work_context = true;
             wi->func(cpu, wi->data);
+            cpu->in_exclusive_work_context = false;
             end_exclusive();
             qemu_mutex_lock_iothread();
         } else {
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index 5ee0046b62..08481ad304 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -373,6 +373,7 @@ struct CPUState {
     bool unplug;
     bool crash_occurred;
     bool exit_request;
+    bool in_exclusive_work_context;
     uint32_t cflags_next_tb;
     /* updates protected by BQL */
     uint32_t interrupt_request;
@@ -785,6 +786,18 @@ void async_run_on_cpu(CPUState *cpu, run_on_cpu_func func, 
run_on_cpu_data data)
  */
 void async_safe_run_on_cpu(CPUState *cpu, run_on_cpu_func func, 
run_on_cpu_data data);
 
+/**
+ * cpu_in_exclusive_work_context()
+ * @cpu: The vCPU to check
+ *
+ * Returns true if @cpu is an exclusive work context, which has
+ * previously been queued via async_safe_run_on_cpu().
+ */
+static inline bool cpu_in_exclusive_work_context(const CPUState *cpu)
+{
+    return cpu->in_exclusive_work_context;
+}
+
 /**
  * qemu_get_cpu:
  * @index: The CPUState@cpu_index value of the CPU to obtain.
-- 
2.20.1