vbox ERROR: VT-x is not available (VERR_VMX_NO_VMX).

After I updated and rebuilded ports tree, I cannot start VirtualBox guests anymore. I was using successfully 2 years old installation and earlier ones too. After I upgraded FreeBSD from 12.0 (I think) to 12.3-RELEASE-p5 r372105 GENERIC amd64, everything still worked OK, it just happened after updating ports tree and recompiling everything, w/VirtualBox Version 6.1.34 r150636. It fails on all my wms (TWM/CDE/XFCE/GNOME and KDE5).

My processor Code 2 Duo has no HyperV support and BIOS has no such option. However, I think to recompile kernel again without "device hyperv" option or do I have to downgrade vbox?

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vbox 6.1 requires hardware virt. support. What's the CPU model?
It sounds like you need to downgrade vbox or get a CPU with VT-x or AMD-V.
 
So my mistake was not to backup the ports tree. I tried ports-mgmt/portdowngrade without success, even the mayor part of the older ones was not compilable. I don't use git yet.

I resolved it installing virtualbox-ose-legacy-5.2.44_6 and virtualbox-ose-kmod-legacy-5.2.44_6.
 
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