[Bug 223531] Instant kernel panic on 'kldload virtio_console' on oVirt 3.5 VM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223531

--- Comment #20 from commit-hook at freebsd.org ---
A commit references this bug:

Author: bryanv
Date: Sat Jan 13 21:39:46 UTC 2018
New revision: 327948
URL: https://svnweb.freebsd.org/changeset/base/327948

Log:
  Fix possible panic when creating VirtIO console dev aliases

  Since we have no control over the name, the MAKEDEV_CHECKNAME flag must be
  used to return an error on an invalid (to devfs) name instead of panicing.

  r305900 that originally added this feature also introduced a few other bugs:
    - Proper locking not performed
    - Theoretically broke the expectation that the control event buffer would
      not span more than one pages, but did not update the CTASSERT that was
      in place to prevent this. However, since the struct
virtio_console_control
      and the bulk buffer together were quite small, this could not have
happened.

  Also workaround an QEMU VirtIO spec violation in that it includes the NUL
  terminator in the buffer length when the spec says it is not included.

  PR:           223531
  MFC after:    1 week

Changes:
  head/sys/dev/virtio/console/virtio_console.c

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