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hw/ppc/spapr: Fix segfault when instantiating a 'pc-dimm' without 'memdev'

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QEMU currently crashes when trying to use a 'pc-dimm' on the pseries
machine without specifying its 'memdev' property. This happens because
pc_dimm_get_memory_region() does not check whether the 'memdev' property
has properly been set by the user. Looking closer at this function, it's
also obvious that it is using &error_abort to call another function - and
this is bad in a function that is used in the hot-plugging calling chain
since this can also cause QEMU to exit unexpectedly.

So let's fix these issues in a proper way now: Add a "Error **errp"
parameter to pc_dimm_get_memory_region() which we use in case the 'memdev'
property has not been set by the user, and which we can use instead of
the &error_abort, and change the callers of get_memory_region() to make
use of this "errp" parameter for proper error checking.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Thomas Huth 2017-08-21 08:30:29 +02:00 • committed by David Gibson
parent 188bfe1b00
commit 0479097859
5 changed files with 55 additions and 19 deletions
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14
hw/mem/pc-dimm.c
View file

@ -363,7 +363,10 @@ static void pc_dimm_get_size(Object *obj, Visitor *v, const char *name,
PCDIMMDevice *dimm = PC_DIMM(obj);
PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(obj);
mr = ddc->get_memory_region(dimm);
mr = ddc->get_memory_region(dimm, errp);
if (!mr) {
return;
}
value = memory_region_size(mr);
visit_type_uint64(v, name, &value, errp);
@ -411,9 +414,14 @@ static void pc_dimm_unrealize(DeviceState *dev, Error **errp)
host_memory_backend_set_mapped(dimm->hostmem, false);
}
static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm)
static MemoryRegion *pc_dimm_get_memory_region(PCDIMMDevice *dimm, Error **errp)
{
return host_memory_backend_get_memory(dimm->hostmem, &error_abort);
if (!dimm->hostmem) {
error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
return NULL;
}
return host_memory_backend_get_memory(dimm->hostmem, errp);
}
static MemoryRegion *pc_dimm_get_vmstate_memory_region(PCDIMMDevice *dimm)