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Re: [Qemu-devel] [PATCH] fix assertion in "info memory-devices" if memde
From: |
Luiz Capitulino |
Subject: |
Re: [Qemu-devel] [PATCH] fix assertion in "info memory-devices" if memdev isn't accessible |
Date: |
Thu, 26 Mar 2015 16:26:17 -0400 |
On Thu, 26 Mar 2015 15:59:25 -0400
Luiz Capitulino <address@hidden> wrote:
> On Thu, 26 Mar 2015 16:42:54 +0000
> Igor Mammedov <address@hidden> wrote:
>
> > showing a memory device whose memdev is removed leads to an assert:
> >
> > (qemu) object_add memory-backend-ram,id=ram0,size=128M
> > (qemu) device_add pc-dimm,id=d0,memdev=ram0
> > (qemu) object_del ram0
> > (qemu) info memory-devices
> > **
> > ERROR:qom/object.c:1274:object_get_canonical_path_component:\
> > assertion failed: (obj->parent != NULL)
> > Aborted
> >
> > so check if memdev is present before calling
> > object_get_canonical_path() and in case it's not assign to
> > "memdev:" field "removed" value.
> >
> > Signed-off-by: Igor Mammedov <address@hidden>
>
> Igor, do you want to go in through my tree?
What about the patch, btw? :)
>
> > ---
> > alternative more generic solution:
> > http://patchwork.ozlabs.org/patch/453343/
> > ---
> > backends/hostmem.c | 23 +++++++++++++++++++++++
> > hw/mem/pc-dimm.c | 15 ++++++++++++++-
> > include/sysemu/hostmem.h | 1 +
> > qmp.c | 1 +
> > 4 files changed, 39 insertions(+), 1 deletion(-)
> >
> > diff --git a/backends/hostmem.c b/backends/hostmem.c
> > index 99e8f99..aa88691 100644
> > --- a/backends/hostmem.c
> > +++ b/backends/hostmem.c
> > @@ -227,6 +227,26 @@ static void host_memory_backend_set_prealloc(Object
> > *obj, bool value,
> > }
> > }
> >
> > +static void host_memory_backend_set_id(Object *obj, const char *id,
> > + Error **errp)
> > +{
> > + HostMemoryBackend *backend = MEMORY_BACKEND(obj);
> > +
> > + if (backend->id) {
> > + error_set(errp, QERR_INVALID_PARAMETER_VALUE, "id",
> > + "can't change already set value");
> > + return;
> > + }
> > + backend->id = g_strdup(id);
> > +}
> > +
> > +static char *host_memory_backend_get_id(Object *obj, Error **errp)
> > +{
> > + HostMemoryBackend *backend = MEMORY_BACKEND(obj);
> > +
> > + return g_strdup(backend->id);
> > +}
> > +
> > static void host_memory_backend_init(Object *obj)
> > {
> > HostMemoryBackend *backend = MEMORY_BACKEND(obj);
> > @@ -237,6 +257,9 @@ static void host_memory_backend_init(Object *obj)
> > "dump-guest-core", true);
> > backend->prealloc = mem_prealloc;
> >
> > + object_property_add_str(obj, "id",
> > + host_memory_backend_get_id,
> > + host_memory_backend_set_id, NULL);
> > object_property_add_bool(obj, "merge",
> > host_memory_backend_get_merge,
> > host_memory_backend_set_merge, NULL);
> > diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
> > index 39f0c97..482a7a0 100644
> > --- a/hw/mem/pc-dimm.c
> > +++ b/hw/mem/pc-dimm.c
> > @@ -69,6 +69,8 @@ int qmp_pc_dimm_device_list(Object *obj, void *opaque)
> > DeviceState *dev = DEVICE(obj);
> >
> > if (dev->realized) {
> > + char *mdevid, *mdevpath;
> > + Object *mdev;
> > MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
> > MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
> > PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1);
> > @@ -86,7 +88,18 @@ int qmp_pc_dimm_device_list(Object *obj, void *opaque)
> > di->node = dimm->node;
> > di->size = object_property_get_int(OBJECT(dimm),
> > PC_DIMM_SIZE_PROP,
> > NULL);
> > - di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));
> > + mdevid = object_property_get_str(OBJECT(dimm->hostmem), "id",
> > + &error_abort);
> > + mdevpath = g_strdup_printf("/objects/%s", mdevid);
> > + g_free(mdevid);
> > + mdev = object_resolve_path_type(mdevpath, TYPE_MEMORY_BACKEND,
> > + NULL);
> > + if (mdev == OBJECT(dimm->hostmem)) {
> > + di->memdev =
> > object_get_canonical_path(OBJECT(dimm->hostmem));
> > + } else {
> > + di->memdev = g_strdup("removed");
> > + }
> > + g_free(mdevpath);
> >
> > info->dimm = di;
> > elem->value = info;
> > diff --git a/include/sysemu/hostmem.h b/include/sysemu/hostmem.h
> > index 1ce4394..63918aa 100644
> > --- a/include/sysemu/hostmem.h
> > +++ b/include/sysemu/hostmem.h
> > @@ -53,6 +53,7 @@ struct HostMemoryBackend {
> > Object parent;
> >
> > /* protected */
> > + char *id;
> > uint64_t size;
> > bool merge, dump;
> > bool prealloc, force_prealloc;
> > diff --git a/qmp.c b/qmp.c
> > index c479e77..6f1cca7 100644
> > --- a/qmp.c
> > +++ b/qmp.c
> > @@ -649,6 +649,7 @@ void object_add(const char *type, const char *id, const
> > QDict *qdict,
> > }
> > }
> > }
> > + object_property_set_str(obj, id, "id", NULL);
> >
> > object_property_add_child(container_get(object_get_root(), "/objects"),
> > id, obj, &local_err);
>