kern/57626: rump does not work on architectures with variadic page size when host page size is != 4k

[martin%NetBSD.org@localhost]

>Number:         57626
>Category:       kern
>Synopsis:       rump does not work on architectures with variadic page size when host page size is != 4k
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 24 09:30:01 +0000 2023
>Originator:     Martin Husemann
>Release:        NetBSD 10.99.9
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD nelly.aprisoft.de 10.99.9 NetBSD 10.99.9 (NELLY) #75: Sun Sep 24 09:30:35 CEST 2023 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/sparc64/compile/NELLY sparc
Architecture: sparc
Machine: sparc
>Description:



>How-To-Repeat:

run sparc (32bit) userland on a sparc with not 4k pagesize, e.g. on a sparc64
machine under netbsd32 emulation and do:

$ cd /usr/tests/net/bpfjit
$ atf-run t_bpfjit

This will show several rump kernel panics like this:

[   1.0500050] panic: uvm_km_alloc failed
[   1.0500050] rump kernel halting...

This is due to the PAGE_SIZE used by the rump components being set to 4k,
see

#define FAKE_PAGE_SHIFT 12

in sys/rump/librump/rumpkern/vm.c

>Fix:
query hypervisor for actual page size