cpus: Document CPUState::vcpu_dirty field

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-Id: <20250703173248.44995-18-philmd@linaro.org>

include/hw/core/cpu.h

@@ -442,6 +442,7 @@ struct qemu_work_item;
  * @opaque: User data.
  * @mem_io_pc: Host Program Counter at which the memory was accessed.
  * @accel: Pointer to accelerator specific state.
+ * @vcpu_dirty: Hardware accelerator is not synchronized with QEMU state
  * @kvm_fd: vCPU file descriptor for KVM.
  * @work_mutex: Lock to prevent multiple access to @work_list.
  * @work_list: List of pending asynchronous work.
@@ -538,7 +539,6 @@ struct CPUState {
     uint32_t kvm_fetch_index;
     uint64_t dirty_pages;
     int kvm_vcpu_stats_fd;
-    bool vcpu_dirty;
 
     /* Use by accel-block: CPU is executing an ioctl() */
     QemuLockCnt in_ioctl_lock;
@@ -554,6 +554,7 @@ struct CPUState {
     uint32_t halted;
     int32_t exception_index;
 
+    bool vcpu_dirty;
     AccelCPUState *accel;
 
     /* Used to keep track of an outstanding cpu throttle thread for migration