[Bug 267023] bhyve exit on hlt subtly broken on VT-x

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267023

            Bug ID: 267023
           Summary: bhyve exit on hlt subtly broken on VT-x
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: jhb@FreeBSD.org

The VMCS contains a field that is set to 1 to indicate that there is a pending
HLT.  In this state, vmxrun will still HLT on resume even if, e.g., the RIP has
been updated to point to a different instruction.  VMMs are required to
explicitly clear this field after a VMexit due to a HLT if the processor should
resume.

See also: https://www.illumos.org/issues/15079

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