Comment 8 for bug 658461

It's largely semantics (it should be 'related'), but the issue is largely the same. For some reason the build farms don't pick up on ahci's dependency on libahci (it's also not registered in modules.dep) and therefore libahci isn't included, leading to the same symptom; SATA won't work with -virtual.
The resolution is for both current bugs also the same: include libahci and register the dependency correctly :)