[Bug 227880] `kldstat -m` does not work for vmm.ko (while `kldstat -n` does)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227880

--- Comment #5 from Mateusz Piotrowski <0mp at FreeBSD.org> ---
Machine 1
=========

 * Laptop (Yoga 3 14)
 * FreeBSD 12.0-CURRENT r332889
 * Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz

Everything works as expected.

----

Machine 2
=========

 * Virtual machine (libvirt guest)
 * FreeBSD 12.0-CURRENT r333017
 * AMD Opteron 63xx class CPU
 * libvirt host machine:
  * Debain 9.3
  * Linux devmachine 4.9.0-5-amd64 #1 SMP Debian 4.9.65-3+deb9u2 (2018-01-04)
x86_64 GNU/Linux) 
  * AMD FX(tm)-8350 Eight-Core Processor) 

kldload vmm results in the following messages in /var/log/messages:

> May  2 18:10:46 freebsd kernel: SVM: not available.
> May  2 18:10:46 freebsd kernel: module_register_init: MOD_LOAD (vmm, 0xffffffff82c30490, 0) error 6
> May  2 18:10:46 freebsd kernel: driver bug: Unable to set devclass (class: fdc devname: (unknown))

Subsequent executions of kldstat look like this:

> $ kldstat -n vmm
> Id Refs Address            Size     Name
> 20    1 0xffffffff82c2c000 53c440   vmm.ko
> $ kldstat -m vmm
> kldstat: can't find module vmm: No such file or directory

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