Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches:

- virtio-scsi: Fix request resubmission after I/O error with iothreads
- qcow2: Fix missing v2/v3 subformat aliases for amend
- qcow(1): More specific error message for wrong format version
- MAINTAINERS: update RBD block maintainer

# gpg: Signature made Mon 08 Jul 2019 15:17:27 BST
# gpg:                using RSA key 7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream:
  qcow2: Allow -o compat=v3 during qemu-img amend
  MAINTAINERS: update RBD block maintainer
  block/qcow: Improve error when opening qcow2 files as qcow
  virtio-scsi: restart DMA after iothread
  qdev: add qdev_add_vm_change_state_handler()
  vl: add qemu_add_vm_change_state_handler_prio()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 62 insertions, 0 deletions

diff --git a/hw/core/Makefile.objs b/hw/core/Makefile.objs
index 585b734358..f8481d959f 100644
--- a/hw/core/Makefile.objs
+++ b/hw/core/Makefile.objs
@@ -7,6 +7,7 @@ common-obj-$(CONFIG_SOFTMMU) += fw-path-provider.o
 common-obj-y += irq.o
 common-obj-y += hotplug.o
 common-obj-$(CONFIG_SOFTMMU) += nmi.o
+common-obj-$(CONFIG_SOFTMMU) += vm-change-state-handler.o
 
 common-obj-$(CONFIG_EMPTY_SLOT) += empty_slot.o
 common-obj-$(CONFIG_XILINX_AXI) += stream.o
diff --git a/hw/core/vm-change-state-handler.c b/hw/core/vm-change-state-handler.c
new file mode 100644
index 0000000000..f814813bdd
--- /dev/null
+++ b/hw/core/vm-change-state-handler.c
@@ -0,0 +1,61 @@
+/*
+ *  qdev vm change state handlers
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License,
+ *  or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/qdev.h"
+
+static int qdev_get_dev_tree_depth(DeviceState *dev)
+{
+    int depth;
+
+    for (depth = 0; dev; depth++) {
+        BusState *bus = dev->parent_bus;
+
+        if (!bus) {
+            break;
+        }
+
+        dev = bus->parent;
+    }
+
+    return depth;
+}
+
+/**
+ * qdev_add_vm_change_state_handler:
+ * @dev: the device that owns this handler
+ * @cb: the callback function to be invoked
+ * @opaque: user data passed to the callback function
+ *
+ * This function works like qemu_add_vm_change_state_handler() except callbacks
+ * are invoked in qdev tree depth order.  Ordering is desirable when callbacks
+ * of children depend on their parent's callback having completed first.
+ *
+ * For example, when qdev_add_vm_change_state_handler() is used, a host
+ * controller's callback is invoked before the children on its bus when the VM
+ * starts running.  The order is reversed when the VM stops running.
+ *
+ * Returns: an entry to be freed with qemu_del_vm_change_state_handler()
+ */
+VMChangeStateEntry *qdev_add_vm_change_state_handler(DeviceState *dev,
+                                                     VMChangeStateHandler *cb,
+                                                     void *opaque)
+{
+    int depth = qdev_get_dev_tree_depth(dev);
+
+    return qemu_add_vm_change_state_handler_prio(cb, opaque, depth);
+}