Sensitive instructions in virtualization

 

 

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Make all sensitive instructions privileged! 0. Hardware supported virtualization (Xen, KVM, VMWare). – Intel VT-x, AMD SVMThe bad news: Most CPU architectures contain sensitive but unprivileged instructions, known as critical instructions. For example, IA32 architecture allows When executing in a virtual machine, some processor instructions cannot be executed directly on the processor. These instructions would interfere with the state [7]. In order to be virtualizable, the set of sensitive instructions must be a subset of the privileged instructions. Sensitive instructions are defined as Behavior Sensitive Instructions: instructions whose behavior depends on the mode or configuration of the hardware. Examples of such instructions on x86 are Some x86 instructions which change hardware state (sensitive instructions) run in both privileged and unprivileged modes. Popek-Goldberg · A privileged instruction can only be executed when the machine is in privileged mode (e.g., x86-64 CPL 0—kernel mode). · A sensitive instruction

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