Asahi Linux reports a UEFI Runtime Services PSCI conduit and an m1n1 hypervisor that emulates GXF

Sources: Asahi Linux, HN 49456851
Summary: The Asahi Linux progress report on Linux 7.2 describes a PSCI conduit implemented over UEFI Runtime Services. The m1n1 side is implemented and the kernel patches enabling its use are on the mailing list as an RFC rather than merged. The report also covers a fix for M4 cores losing state on WFI, and an m1n1 hypervisor change that emulates GXF in order to load Apple's SPTM.
Why it matters: Apple cores implement no EL3, so the standard PSCI conduits are unavailable, and routing PSCI through UEFI Runtime Services is what would make the cpuidle driver upstreamable at all.