[Bug 271251] Kernel panics when loading vmm module with VT-x disabled

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 05 May 2023 03:38:45 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271251

            Bug ID: 271251
           Summary: Kernel panics when loading vmm module with VT-x
                    disabled
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: haron86@gmail.com

Created attachment 241983
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=241983&action=edit
kernel panic screenshot

Loading vmm module causes panic when VT-x is disabled in BIOS.

This starts to happen after https://reviews.freebsd.org/D39805

Memory for vmxon_region is freed in vmx_modcleanup() when it was not allocated
in vmx_modinit() due to disabled VMX.

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