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pc-dimm: do not allow setting an in-use memdev 

using the same memdev backend more than once will cause
assertion at MemoryRegion mapping time because it's already
mapped. Prevent it by checking that the associated MemoryRegion
is not mapped.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

MST: tweak commit log
master
Igor Mammedov 2014-06-02 15:25:07 +02:00 committed by Michael S. Tsirkin
parent eed2bacfd2
commit 7bb5d6ade6
1 changed files with 16 additions and 1 deletions
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17
hw/mem/pc-dimm.c
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@ -43,6 +43,21 @@ static void pc_dimm_get_size(Object *obj, Visitor *v, void *opaque,
visit_type_int(v, &value, name, errp);
}
static void pc_dimm_check_memdev_is_busy(Object *obj, const char *name,
Object *val, Error **errp)
{
MemoryRegion *mr;
mr = host_memory_backend_get_memory(MEMORY_BACKEND(val), errp);
if (memory_region_is_mapped(mr)) {
char *path = object_get_canonical_path_component(val);
error_setg(errp, "can't use already busy memdev: %s", path);
g_free(path);
} else {
qdev_prop_allow_set_link_before_realize(obj, name, val, errp);
}
}
static void pc_dimm_init(Object *obj)
{
PCDIMMDevice *dimm = PC_DIMM(obj);
@ -51,7 +66,7 @@ static void pc_dimm_init(Object *obj)
NULL, NULL, NULL, &error_abort);
object_property_add_link(obj, PC_DIMM_MEMDEV_PROP, TYPE_MEMORY_BACKEND,
(Object **)&dimm->hostmem,
qdev_prop_allow_set_link_before_realize,
pc_dimm_check_memdev_is_busy,
OBJ_PROP_LINK_UNREF_ON_RELEASE,
&error_abort);
}