While RISC-V is flourishing when it comes to this open-source CPU architecture, the related OpenRISC architecture is still advancing but not seeing as much hardware efforts around it. In any case, the Linux kernel support continues improving for OpenRISC and with Linux 5.9 are more improvements...
Back in Linux 5.4 Xen 32-bit PV guest support was deprecated while now for Linux 5.9 it's set to be removed entirely. Last year's deprecation comes with the 32-bit usage dwindling in general but PVH being preferred to PV, Meltdown mitigations not being present, and the code not seeing much activity. Now for Linux 5.9 that support is being gutted...