https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230773
--- Comment #3 from commit-h...@freebsd.org ---
A commit references this bug:
Author: jhb
Date: Thu Oct 11 18:27:20 UTC 2018
New revision: 339312
URL: https://svnweb.freebsd.org/changeset/base/339312
Log:
Fully restore the GDTR, IDTR, and LDTR after VT-x VM exits.
The VT-x VMCS only stores the base address of the GDTR and IDTR. As a
result, VM exits use a fixed limit of 0x for the host GDTR and
IDTR losing the smaller limits set in when the initial GDT is loaded
on each CPU during boot. Explicitly save and restore the full GDTR
and IDTR contents around VM entries and exits to restore the correct
limit.
Similarly, explicitly save and restore the LDT selector. VM exits
always clear the host LDTR as if the LDT was loaded with a NULL
selector and a userspace hypervisor is probably using a NULL selector
anyway, but save and restore the LDT explicitly just to be safe.
PR: 230773
Reported by: John Levon
Reviewed by: kib
Tested by:araujo
Approved by: re (rgrimes)
MFC after:1 week
Changes:
head/sys/amd64/include/cpufunc.h
head/sys/amd64/vmm/intel/vmx.c
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