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Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-comp
From: |
Zhu Guihua |
Subject: |
Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion |
Date: |
Fri, 28 Nov 2014 09:23:15 +0800 |
On Thu, 2014-11-27 at 14:15 +0200, Marcel Apfelbaum wrote:
> On Thu, 2014-11-27 at 20:08 +0800, Zhu Guihua wrote:
> > On Thu, 2014-11-27 at 13:41 +0200, Marcel Apfelbaum wrote:
> > > On Thu, 2014-11-27 at 19:35 +0800, Zhu Guihua wrote:
> > > > On Thu, 2014-11-27 at 13:11 +0200, Marcel Apfelbaum wrote:
> > > > > On Wed, 2014-11-26 at 13:05 -0500, Luiz Capitulino wrote:
> > > > > > On Wed, 26 Nov 2014 13:50:01 +0200
> > > > > > Marcel Apfelbaum <address@hidden> wrote:
> > > > > >
> > > > > > > The commits:
> > > > > > > - 6a1fa9f5 (monitor: add del completion for peripheral device)
> > > > > > > - 66e56b13 (qdev: add qdev_build_hotpluggable_device_list helper)
> > > > > > >
> > > > > > > cause a QEMU crash when trying to use HMP device_del
> > > > > > > auto-completion.
> > > > > > > It can be easily reproduced by:
> > > > > > > <qemu-bin> -enable-kvm ~/images/fedora.qcow2 -monitor stdio
> > > > > > > -device virtio-net-pci,id=vnet
> > > > > > >
> > > > > > > (qemu) device_del
> > > > > > >
> > > > > > > /home/mapfelba/git/upstream/qemu/hw/core/qdev.c:941:qdev_build_hotpluggable_device_list:
> > > > > > > Object 0x7f6ce04e4fe0 is not an instance of type device
> > > > > > > Aborted (core dumped)
> > > > > > >
> > > > > > > The root cause is qdev_build_hotpluggable_device_list going
> > > > > > > recursively over
> > > > > > > all peripherals and their children assuming all are devices. It
> > > > > > > doesn't work
> > > > > > > since PCI devices have at least on child which is a memory region
> > > > > > > (bus master).
> > > > > > >
> > > > > > > Solved by observing that all devices appear as direct children of
> > > > > > > /machine/peripheral container. No need of going recursively
> > > > > > > over all the children.
> > > > > > >
> > > > > > > Signed-off-by: Marcel Apfelbaum <address@hidden>
> > > > > >
> > > > > > Peter, can you apply this patch directly to master to avoid me a
> > > > > > pull
> > > > > > request? Maybe it's a good idea to wait until tomorrow for more
> > > > > > reviewers though.
> > > > > Speaking of reviewers, I double checked the patch and indeed it solves
> > > > > the crash, but the original patch has another semantic error.
> > > > > It looks for hot-pluggable device and not *hot-plugged* ones.
> > > > >
> > > > > I'll try to come with a solution fast. It should be a "hot-plugged"
> > > > > property somewhere...
> > > > >
> > > > Hi Marcel,
> > > >
> > > > May you give an example for a hot-plugged but non-hot-pluggable device?
> > > I was talking about something different:
> > > A hot-pluggable device that was not hot-plugged is assumed to be
> > > hot-unpluggable.
> > > This is not true for pci-2-pci device.
> > >
> >
> > I'm sorry to misunderstand your mean.
> > Thanks for your explanation.
> >
> > > But this is another issue and can wait for 2.3.
> > > So you patch was *almost* correct for looking hotpluggable devices,
> > > the only problem we have is with pci-2-pci bridge (, and maybe with
> > > others that I don't know).
> > >
> >
> > Yes, I test pci-bridge just now. The command "device_del" will cause
> > core dump. I will investigate other devices further.
> After this patch you will not have a core dump.
>
> >
> > And if I device_add pci-bridge without property chassis_nr, it will
> > causes core dumped too.
> Are you sure you use the master branch? This is not happening
> Anyway, you didn't modify device_add, and this is not happening
> on the latest master version.
>
> Please correct me if I am wrong.
you are right, I am wrong. I used the master branch but not the latest
version yesterday.
regards,
Zhu
>
> Thanks,
> Marcel
>
> >
> > Regards,
> > Zhu
> >
> > > But for now, we should get the crash fix in and handle that separately
> > > for 2.3. If anybody has a better idea, pleas advice.
> > >
> > > Thanks,
> > > Marcel
> > >
> > >
> > >
> > >
> > > >
> > > > Regards,
> > > > Zhu
> > > >
> > > > > Thanks,
> > > > > Marcel
> > > > >
> > > > >
> > > > > >
> > > > > > Marcel, thanks a lot for taking care of this!
> > > > > >
> > > > > > > ---
> > > > > > > hw/core/qdev.c | 12 ++++++++++--
> > > > > > > include/hw/qdev-core.h | 2 +-
> > > > > > > monitor.c | 11 ++++-------
> > > > > > > 3 files changed, 15 insertions(+), 10 deletions(-)
> > > > > > >
> > > > > > > diff --git a/hw/core/qdev.c b/hw/core/qdev.c
> > > > > > > index 413b413..35fd00d 100644
> > > > > > > --- a/hw/core/qdev.c
> > > > > > > +++ b/hw/core/qdev.c
> > > > > > > @@ -935,7 +935,7 @@ void qdev_alias_all_properties(DeviceState
> > > > > > > *target, Object *source)
> > > > > > > } while (class != object_class_by_name(TYPE_DEVICE));
> > > > > > > }
> > > > > > >
> > > > > > > -int qdev_build_hotpluggable_device_list(Object *obj, void
> > > > > > > *opaque)
> > > > > > > +static int qdev_add_hotpluggable_device(Object *obj, void
> > > > > > > *opaque)
> > > > > > > {
> > > > > > > GSList **list = opaque;
> > > > > > > DeviceState *dev = DEVICE(obj);
> > > > > > > @@ -944,10 +944,18 @@ int
> > > > > > > qdev_build_hotpluggable_device_list(Object *obj, void *opaque)
> > > > > > > *list = g_slist_append(*list, dev);
> > > > > > > }
> > > > > > >
> > > > > > > - object_child_foreach(obj,
> > > > > > > qdev_build_hotpluggable_device_list, opaque);
> > > > > > > return 0;
> > > > > > > }
> > > > > > >
> > > > > > > +GSList *qdev_build_hotpluggable_device_list(Object *peripheral)
> > > > > > > +{
> > > > > > > + GSList *list = NULL;
> > > > > > > +
> > > > > > > + object_child_foreach(peripheral,
> > > > > > > qdev_add_hotpluggable_device, &list);
> > > > > > > +
> > > > > > > + return list;
> > > > > > > +}
> > > > > > > +
> > > > > > > static bool device_get_realized(Object *obj, Error **errp)
> > > > > > > {
> > > > > > > DeviceState *dev = DEVICE(obj);
> > > > > > > diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
> > > > > > > index d3a2940..589bbe7 100644
> > > > > > > --- a/include/hw/qdev-core.h
> > > > > > > +++ b/include/hw/qdev-core.h
> > > > > > > @@ -365,7 +365,7 @@ extern int qdev_hotplug;
> > > > > > >
> > > > > > > char *qdev_get_dev_path(DeviceState *dev);
> > > > > > >
> > > > > > > -int qdev_build_hotpluggable_device_list(Object *obj, void
> > > > > > > *opaque);
> > > > > > > +GSList *qdev_build_hotpluggable_device_list(Object *peripheral);
> > > > > > >
> > > > > > > void qbus_set_hotplug_handler(BusState *bus, DeviceState
> > > > > > > *handler,
> > > > > > > Error **errp);
> > > > > > > diff --git a/monitor.c b/monitor.c
> > > > > > > index fa00594..f1031a1 100644
> > > > > > > --- a/monitor.c
> > > > > > > +++ b/monitor.c
> > > > > > > @@ -4321,17 +4321,14 @@ void object_add_completion(ReadLineState
> > > > > > > *rs, int nb_args, const char *str)
> > > > > > > static void peripheral_device_del_completion(ReadLineState *rs,
> > > > > > > const char *str,
> > > > > > > size_t len)
> > > > > > > {
> > > > > > > - Object *peripheral;
> > > > > > > - GSList *list = NULL, *item;
> > > > > > > + Object *peripheral = container_get(qdev_get_machine(),
> > > > > > > "/peripheral");
> > > > > > > + GSList *list, *item;
> > > > > > >
> > > > > > > - peripheral = object_resolve_path("/machine/peripheral/",
> > > > > > > NULL);
> > > > > > > - if (peripheral == NULL) {
> > > > > > > + list = qdev_build_hotpluggable_device_list(peripheral);
> > > > > > > + if (!list) {
> > > > > > > return;
> > > > > > > }
> > > > > > >
> > > > > > > - object_child_foreach(peripheral,
> > > > > > > qdev_build_hotpluggable_device_list,
> > > > > > > - &list);
> > > > > > > -
> > > > > > > for (item = list; item; item = g_slist_next(item)) {
> > > > > > > DeviceState *dev = item->data;
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> > >
> >
> >
>
>
>
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, (continued)
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Igor Mammedov, 2014/11/26
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Luiz Capitulino, 2014/11/26
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Peter Maydell, 2014/11/26
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Marcel Apfelbaum, 2014/11/26
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Marcel Apfelbaum, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Marcel Apfelbaum, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Zhu Guihua, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Marcel Apfelbaum, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Zhu Guihua, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Marcel Apfelbaum, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion,
Zhu Guihua <=
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Igor Mammedov, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Marcel Apfelbaum, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Zhu Guihua, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Marcel Apfelbaum, 2014/11/28
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Igor Mammedov, 2014/11/28
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Peter Maydell, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Marcel Apfelbaum, 2014/11/27
- Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Luiz Capitulino, 2014/11/27
Re: [Qemu-devel] [PATCH] hmp: fix regression of HMP device_del auto-completion, Peter Maydell, 2014/11/27