untrusted comment: verify with openbsd-62-base.pub
RWRVWzAMgtyg7kmRnwLGqrn27bAHVKcprm3SUYUMI9YPVnibgU8PArypT1KGXDbXwlxElgrhpd14O72xJj4zblmOgW/7FeatEgA=

OpenBSD 6.2 errata 024, September 21, 2018:

On AMD CPU, LDTR must be managed crossing between VMs.

Apply by doing:
   signify -Vep /etc/signify/openbsd-62-base.pub -x 024_ldtr.patch.sig \
       -m - | (cd /usr/src && patch -p0)

And then rebuild and install a new kernel:
   KK=`sysctl -n kern.osversion | cut -d# -f1`
   cd /usr/src/sys/arch/`machine`/compile/$KK
   make obj
   make config
   make
   make install

Index: sys/arch/amd64/amd64/vmm_support.S
===================================================================
RCS file: /cvs/src/sys/arch/amd64/amd64/vmm_support.S,v
--- sys/arch/amd64/amd64/vmm_support.S  22 Aug 2018 22:57:52 -0000      1.9.2.1
+++ sys/arch/amd64/amd64/vmm_support.S  19 Sep 2018 11:45:48 -0000      1.9.2.2
@@ -640,6 +640,8 @@ restore_host_svm:
       movw    %ax, %es

       xorq    %rax, %rax
+       lldtw   %ax             /* Host LDT is always 0 */
+
       popw    %ax             /* ax = saved TR */

       popq    %rdx

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