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
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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>

MAINTAINERS

@@ -2385,7 +2385,7 @@ S: Supported
 F: block/vmdk.c
 
 RBD
-M: Josh Durgin <jdurgin@redhat.com>
+M: Jason Dillaman <dillaman@redhat.com>
 L: qemu-block@nongnu.org
 S: Supported
 F: block/rbd.c

block/qcow.c

@@ -156,7 +156,12 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail;
     }
     if (header.version != QCOW_VERSION) {
-        error_setg(errp, "Unsupported qcow version %" PRIu32, header.version);
+        error_setg(errp, "qcow (v%d) does not support qcow version %" PRIu32,
+                   QCOW_VERSION, header.version);
+        if (header.version == 2 || header.version == 3) {
+            error_append_hint(errp, "Try the 'qcow2' driver instead.\n");
+        }
+
         ret = -ENOTSUP;
         goto fail;
     }

block/qcow2.c

@@ -4823,9 +4823,9 @@ static int qcow2_amend_options(BlockDriverState *bs, QemuOpts *opts,
             compat = qemu_opt_get(opts, BLOCK_OPT_COMPAT_LEVEL);
             if (!compat) {
                 /* preserve default */
-            } else if (!strcmp(compat, "0.10")) {
+            } else if (!strcmp(compat, "0.10") || !strcmp(compat, "v2")) {
                 new_version = 2;
-            } else if (!strcmp(compat, "1.1")) {
+            } else if (!strcmp(compat, "1.1") || !strcmp(compat, "v3")) {
                 new_version = 3;
             } else {
                 error_setg(errp, "Unknown compatibility level %s", compat);
@@ -5098,7 +5098,7 @@ static QemuOptsList qcow2_create_opts = {
         {
             .name = BLOCK_OPT_COMPAT_LEVEL,
             .type = QEMU_OPT_STRING,
-            .help = "Compatibility level (0.10 or 1.1)"
+            .help = "Compatibility level (v2 [0.10] or v3 [1.1])"
         },
         {
             .name = BLOCK_OPT_BACKING_FILE,

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

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);
+}

hw/scsi/scsi-bus.c

@@ -207,8 +207,8 @@ static void scsi_qdev_realize(DeviceState *qdev, Error **errp)
         error_propagate(errp, local_err);
         return;
     }
-    dev->vmsentry = qemu_add_vm_change_state_handler(scsi_dma_restart_cb,
-                                                     dev);
+    dev->vmsentry = qdev_add_vm_change_state_handler(DEVICE(dev),
+            scsi_dma_restart_cb, dev);
 }
 
 static void scsi_qdev_unrealize(DeviceState *qdev, Error **errp)

hw/virtio/virtio.c

@@ -2362,8 +2362,8 @@ void virtio_init(VirtIODevice *vdev, const char *name,
     } else {
         vdev->config = NULL;
     }
-    vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change,
-                                                     vdev);
+    vdev->vmstate = qdev_add_vm_change_state_handler(DEVICE(vdev),
+            virtio_vmstate_change, vdev);
     vdev->device_endian = virtio_default_endian();
     vdev->use_guest_notifier_mask = true;
 }

include/hw/qdev-core.h

@@ -6,6 +6,7 @@
 #include "qom/object.h"
 #include "hw/irq.h"
 #include "hw/hotplug.h"
+#include "sysemu/sysemu.h"
 
 enum {
     DEV_NVECTORS_UNSPECIFIED = -1,
@@ -450,4 +451,8 @@ static inline bool qbus_is_hotpluggable(BusState *bus)
 void device_listener_register(DeviceListener *listener);
 void device_listener_unregister(DeviceListener *listener);
 
+VMChangeStateEntry *qdev_add_vm_change_state_handler(DeviceState *dev,
+                                                     VMChangeStateHandler *cb,
+                                                     void *opaque);
+
 #endif

include/sysemu/sysemu.h

@@ -29,6 +29,8 @@ typedef void VMChangeStateHandler(void *opaque, int running, RunState state);
 
 VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb,
                                                      void *opaque);
+VMChangeStateEntry *qemu_add_vm_change_state_handler_prio(
+        VMChangeStateHandler *cb, void *opaque, int priority);
 void qemu_del_vm_change_state_handler(VMChangeStateEntry *e);
 void vm_state_notify(int running, RunState state);
 

vl.c

@@ -1365,27 +1365,56 @@ static int machine_help_func(QemuOpts *opts, MachineState *machine)
 struct vm_change_state_entry {
     VMChangeStateHandler *cb;
     void *opaque;
-    QLIST_ENTRY (vm_change_state_entry) entries;
+    QTAILQ_ENTRY(vm_change_state_entry) entries;
+    int priority;
 };
 
-static QLIST_HEAD(, vm_change_state_entry) vm_change_state_head;
+static QTAILQ_HEAD(, vm_change_state_entry) vm_change_state_head;
+
+/**
+ * qemu_add_vm_change_state_handler_prio:
+ * @cb: the callback to invoke
+ * @opaque: user data passed to the callback
+ * @priority: low priorities execute first when the vm runs and the reverse is
+ *            true when the vm stops
+ *
+ * Register a callback function that is invoked when the vm starts or stops
+ * running.
+ *
+ * Returns: an entry to be freed using qemu_del_vm_change_state_handler()
+ */
+VMChangeStateEntry *qemu_add_vm_change_state_handler_prio(
+        VMChangeStateHandler *cb, void *opaque, int priority)
+{
+    VMChangeStateEntry *e;
+    VMChangeStateEntry *other;
+
+    e = g_malloc0(sizeof(*e));
+    e->cb = cb;
+    e->opaque = opaque;
+    e->priority = priority;
+
+    /* Keep list sorted in ascending priority order */
+    QTAILQ_FOREACH(other, &vm_change_state_head, entries) {
+        if (priority < other->priority) {
+            QTAILQ_INSERT_BEFORE(other, e, entries);
+            return e;
+        }
+    }
+
+    QTAILQ_INSERT_TAIL(&vm_change_state_head, e, entries);
+    return e;
+}
 
 VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb,
                                                      void *opaque)
 {
-    VMChangeStateEntry *e;
-
-    e = g_malloc0(sizeof (*e));
-
-    e->cb = cb;
-    e->opaque = opaque;
-    QLIST_INSERT_HEAD(&vm_change_state_head, e, entries);
-    return e;
+    return qemu_add_vm_change_state_handler_prio(cb, opaque, 0);
 }
 
 void qemu_del_vm_change_state_handler(VMChangeStateEntry *e)
 {
-    QLIST_REMOVE (e, entries);
+    QTAILQ_REMOVE(&vm_change_state_head, e, entries);
     g_free(e);
 }
 
@@ -1395,9 +1424,15 @@ void vm_state_notify(int running, RunState state)
 
     trace_vm_state_notify(running, state, RunState_str(state));
 
-    QLIST_FOREACH_SAFE(e, &vm_change_state_head, entries, next) {
+    if (running) {
+        QTAILQ_FOREACH_SAFE(e, &vm_change_state_head, entries, next) {
             e->cb(e->opaque, running, state);
         }
+    } else {
+        QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) {
+            e->cb(e->opaque, running, state);
+        }
+    }
 }
 
 static ShutdownCause reset_requested;
@@ -2911,7 +2946,7 @@ int main(int argc, char **argv, char **envp)
         exit(1);
     }
 
-    QLIST_INIT (&vm_change_state_head);
+    QTAILQ_INIT(&vm_change_state_head);
     os_setup_early_signal_handling();
 
     cpu_option = NULL;