"Sushi is a tiny, simple hypervisor based monitoring tool detecting and stopping some of PatchGuard activities from Ring-1." I know what a hypervisor is, I kno

"Sushi is a tiny, simple hypervisor based monitoring tool detecting and stopping some of PatchGuard activities from Ring-1." I know what a hypervisor is, I know Ring-1 is something like the vital area of the Windows kernel, and Patchguard seems to be a tool to protect the kernel but I still don't understand what Sushi is. Is it a hacking tool to corrupt the kernel ?