port-arm/58704: cpu0 at acpi0: unknown CPU (ID = 0xc00fac31), id 0x0

[campbell+netbsd%mumble.net@localhost]

>Number:         58704
>Category:       port-arm
>Synopsis:       cpu0 at acpi0: unknown CPU (ID = 0xc00fac31), id 0x0
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-arm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Sep 28 10:55:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current
>Organization:
The NetCPUID Notfoundation
>Environment:
NetBSD ... 10.99.11 NetBSD 10.99.11 (GENERIC64) #9: Sat Aug 10 14:32:34 UTC 2024  root@...:/home/riastradh/netbsd/current/obj.arm64/sys/arch/evbarm/compile/GENERIC64 evbarm
>Description:
On an Oracle Cloud Infrastructure A2-type compute instance (aarch64), NetBSD reports:

cpu0 at acpi0: unknown CPU (ID = 0xc00fac31), id 0x0

Similarly, `cpuctl identify 0' reports:

cpu0: unknown CPU ID: 0xc00fac31

Full dmesg: https://dmesgd.nycbug.org/index.cgi?do=view&id=7869
>How-To-Repeat:
Boot NetBSD on an OCI A2 compute instance (VM.Standard.A2.Flex).
>Fix:
Probably these changes:

https://mail-index.netbsd.org/source-changes/2024/09/27/msg153560.html
https://mail-index.netbsd.org/source-changes/2024/09/27/msg153561.html
https://mail-index.netbsd.org/source-changes/2024/09/27/msg153562.html