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 <kraxel@redhat.com>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20240409105537.18308-2-philmd@linaro.org>
(cherry picked from commit ec0504b989ca61e03636384d3602b7bf07ffe4da)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: trivial #include context fixup in include/hw/virtio/virtio.h)

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index e4f8ed1e634cdfd34d791a16797dcc4781efb366..4a35d7cb0cde9f338328d320eee32f0b9e567f84 100644 (file)
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -5029,3 +5029,13 @@ 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
index 96a56430a69cb1059f651f3abfbfb913c21bb777..c1a7c9bd3b0592a24db4e3a0d77b0df5ce1a371a 100644 (file)
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -23,6 +23,7 @@
 #include "standard-headers/linux/virtio_ring.h"
 #include "qom/object.h"
 #include "hw/virtio/vhost.h"
+#include "block/aio.h"
 
 /*
  * A guest should never accept this. It implies negotiation is broken
@@ -463,4 +464,10 @@ 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