Function panda_sys::memory_region_ref

pub unsafe extern "C" fn memory_region_ref(mr: *mut MemoryRegion)

memory_region_ref: Add 1 to a memory region’s reference count

Whenever memory regions are accessed outside the BQL, they need to be preserved against hot-unplug. MemoryRegions actually do not have their own reference count; they piggyback on a QOM object, their “owner”. This function adds a reference to the owner.

All MemoryRegions must have an owner if they can disappear, even if the device they belong to operates exclusively under the BQL. This is because the region could be returned at any time by memory_region_find, and this is usually under guest control.

@mr: the #MemoryRegion