It should be. Most mobos are set to auto modes on most settings. The only way to be sure is check the BIOS settings upon boot.
All AMD CPUs support hardware virtualization, except Sempron. So as long as you don't have a Sempron, there should be no reason the board won't have it on by default (but that was up to HP to implement, couldn't find a BIOS PDF on HPs site).http://sites.amd.com/us/business/it-solutions/virtualization/Pages/virtualization.aspx