hw/virtio: Introduce virtio_bh_new_guarded() helper

Introduce virtio_bh_new_guarded(), similar to qemu_bh_new_guarded() but using the transport memory guard, instead of the device one (there can only be one virtio device per virtio bus). Inspired-by: Gerd Hoffmann <[email protected]> Reviewed-by: Gerd Hoffmann <[email protected]> Acked-by: Michael S. Tsirkin <[email protected]> Signed-off-by: Philippe Mathieu-Daudé <[email protected]> Reviewed-by: Michael S. Tsirkin <[email protected]> Message-Id: <[email protected]>
AMDESE · Apr 10, 2024 · ec0504b · ec0504b
1 parent 927284d
commit ec0504b
Show file tree

Hide file tree

Showing 2 changed files with 17 additions and 0 deletions.
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
@@ -4145,3 +4145,13 @@ static void virtio_register_types(void)
 }
 
 type_init(virtio_register_types)
+
+QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev,
+                                   QEMUBHFunc *cb, void *opaque,
+                                   const char *name)
+{
+    DeviceState *transport = qdev_get_parent_bus(dev)->parent;
+
+    return qemu_bh_new_full(cb, opaque, name,
+                            &transport->mem_reentrancy_guard);
+}
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
@@ -22,6 +22,7 @@
 #include "standard-headers/linux/virtio_config.h"
 #include "standard-headers/linux/virtio_ring.h"
 #include "qom/object.h"
+#include "block/aio.h"
 
 /*
  * A guest should never accept this. It implies negotiation is broken
@@ -508,4 +509,10 @@ static inline bool virtio_device_disabled(VirtIODevice *vdev)
 bool virtio_legacy_allowed(VirtIODevice *vdev);
 bool virtio_legacy_check_disabled(VirtIODevice *vdev);
 
+QEMUBH *virtio_bh_new_guarded_full(DeviceState *dev,
+                                   QEMUBHFunc *cb, void *opaque,
+                                   const char *name);
+#define virtio_bh_new_guarded(dev, cb, opaque) \
+    virtio_bh_new_guarded_full((dev), (cb), (opaque), (stringify(cb)))
+
 #endif