Long description

Figure a: It contains two blocks connected by an arrow pointed downward labeled Sensitive instruction executed by H W. The bottom block is labeled hardware. The top block consists of three segments. The first segment contains two open circles, the second segment is labeled V M I Linux, and the third segment is labeled V M I L or H W interface library.

Figure b: It contains two blocks connected by an arrow pointed downward labeled Hypervisor call. The bottom block consists of two segments labeled VMware and hardware. The top block consists of three segments. The first segment contains two open circles, the second segment is labeled V M I Linux, and the third segment is labeled V M I L to Vmware library.

Figure c: It contains two blocks connected by an arrow pointed downward labeled Hypervisor call. The bottom block consists of two segments labeled Xen and hardware. The top block consists of three segments. The first segment contains two open circles, the second segment is labeled V M I Linux, and the third segment is labeled V M I L to Xen library.