China roadtrip from Xining to Yushu: restricted areas for foreigners?

Me and my girlfriend (who is a Chinese national) would like to do a roadtrip from Xining to Yushu (and then continue towards Chengdu through western Sichuan). Are there any areas restricted to foreigners we’ll be passing through following this route? Also: is Yushu open to foreigners again? The rules are quite opaque and most posts from 5 up until 3 years ago state that almost the whole of Qinghai province is closed-off for non-Chinese. Recently i came across a couple more positive experiences; even an American traveler who flew to Yushu of all places during his first trip to China. The restrictions in regards to western Sichuan seem such more straightforward compared to those of Qinghai…

Thanks in advance:)