Do the entire lookup under RCU, which avoids atomic operations
in flatview_ref and flatview_unref.
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
}
range = addrrange_make(int128_make64(addr), int128_make64(size));
- view = address_space_get_flatview(as);
+ rcu_read_lock();
+ view = atomic_rcu_read(&as->current_map);
fr = flatview_lookup(view, range);
if (!fr) {
- flatview_unref(view);
- return ret;
+ goto out;
}
while (fr > view->ranges && addrrange_intersects(fr[-1].addr, range)) {
ret.offset_within_address_space = int128_get64(range.start);
ret.readonly = fr->readonly;
memory_region_ref(ret.mr);
-
- flatview_unref(view);
+out:
+ rcu_read_unlock();
return ret;
}