On Thu, May 04, 2017 at 09:43:07AM -0400, [email protected] wrote:
>
> >Synopsis: On 6.1/i386, config -e -u -o bsd.new bsd reports
> >"kvm_openfiles: /dev/mem: Operation not permitted
> >Category: system
> >Environment:
> System : OpenBSD 6.1
> Details : OpenBSD 6.1 (GENERIC) #1: Wed May 3 01:51:12 CEST 2017
>
> [email protected]:/usr/src/sys/arch/i386/compile/GENERIC
>
> Architecture: OpenBSD.i386
> Machine : i386
> >Description:
> My thinkpad is so old that it requires ACPI to be disabled in the
> kernel, else the kernel will not boot. It also requires clcs to
> be disabled (the clcs probing code mistakenly thinks the hardware
> is present on my thinkpad, which it isn't). To create a kernel
> (bsd.new) where acpi and clcs is disabled by default, I typically do
> this:
> config -e -u -o bsd.new bsd
> (then I interactively disable acpi and clcs and save the result).
> Then I rename bsd to bsd.old and bsd.new to bsd and reboot.
>
> However in OpenBSD 6.1, attempting to run config in this way fails,
> with the message:
> config: kvm_openfiles: /dev/mem: Operation not permitted
>
> >How-To-Repeat:
> config -e -u -o bsd.new bsd
> >Fix:
> Workaround: It's possible to work around this by manually compiling and
> installing a custom kernel where ACPI is disabled, or, on every boot,
> booting with -c and disabling ACPI. Both workarounds are suboptimal.
>
>
> dmesg:
> OpenBSD 6.1 (GENERIC) #1: Wed May 3 01:51:12 CEST 2017
> [email protected]:/usr/src/sys/arch/i386/compile/GENERIC
> cpu0: Intel Celeron ("GenuineIntel" 686-class, 256KB L2 cache) 398 MHz
> cpu0:
> FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PSE36,MMX,FXSR,PERF
> real mem = 301285376 (287MB)
> avail mem = 282808320 (269MB)
> User Kernel Config
> UKC> disable acpi
> 492 acpi0 disabled
> UKC> disable clcs
> 87 clcs* disabled
> ..
The problem here is config(8) -u needs kvm(3) to access the changes made
during boot in UKC, with OpenBSD 6.1 access to /dev/{,k}mem was disabled
at securelevel > 0.
http://marc.info/?l=openbsd-cvs&m=147481705211536&w=2
You can still do, and retype the changes you require to be saved:
# config -e -o /bsd.new /bsd
Of course, sending a proper report about the issues with have with acpi
and clcs might better.
-Bryan.
