[Qemu-devel] [PATCH] qdev: fix hotplug when no -device is specified

[Qemu-devel] [PATCH] qdev: fix hotplug when no -device is specified

[Anthony Liguori]

The peripheral[-anon] containers are initialized lazily but since they sit on
sysbus, they can not be created after realize.  This was causing an abort() to
occur during hotplug if no -device option was used.

This was spotted by qemu-test::device-add.sh

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 hw/qdev.c |    6 ++++++
 hw/qdev.h |    8 ++++++++
 vl.c      |    2 ++
 3 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/hw/qdev.c b/hw/qdev.c
index 0465632..d0cf66d 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -1529,3 +1529,9 @@ void qdev_property_add_str(DeviceState *dev, const char *name,
                       qdev_property_release_str,
                       prop, errp);
 }
+
+void qdev_machine_init(void)
+{
+    qdev_get_peripheral_anon();
+    qdev_get_peripheral();
+}
diff --git a/hw/qdev.h b/hw/qdev.h
index d5896be..2abb767 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -616,4 +616,12 @@ void qdev_property_add_str(DeviceState *dev, const char *name,
  */
 char *qdev_get_type(DeviceState *dev, Error **errp);
 
+/**
+ * @qdev_machine_init
+ *
+ * Initialize platform devices before machine init.  This is a hack until full
+ * support for composition is added.
+ */
+void qdev_machine_init(void);
+
 #endif
diff --git a/vl.c b/vl.c
index da69f94..78b790c 100644
--- a/vl.c
+++ b/vl.c
@@ -3335,6 +3335,8 @@ int main(int argc, char **argv, char **envp)
     }
     qemu_add_globals();
 
+    qdev_machine_init();
+
     machine->init(ram_size, boot_devices,
                   kernel_filename, kernel_cmdline, initrd_filename, cpu_model);
 
-- 
1.7.4.1

Re: [Qemu-devel] [PATCH] qdev: fix hotplug when no -device is specified

[Markus Armbruster]

device_del is broken for me in master:

$ qemu-system-x86_64 -nodefaults -S -m 384 -vnc :0 -monitor stdio -usb
QEMU 1.0.50 monitor - type 'help' for more information
(qemu) device_add usb-mouse,id=foo
(qemu) device_del foo
Device 'foo' is in use

Same for any hot-pluggable device I tried, with and without -S.
git-bisect fingers this patch, which went in as commit 1de81d28.