Maintaining processor resources during architectural events

A method comprising:

• storing, in a control register, a page directory base address corresponding to an address space;
• storing, in a translation lookaside buffer, an address space identifier;
• determining whether the address space exists in a list of active address spaces in response to a move to control register instruction;
• and
• executing the move to control register instruction to switch between address spaces without flushing the translation lookaside buffer in response to a determination that the address space is present in the list of active address spaces.

A processor to execute a virtual machine monitor, the virtual machine monitor to present one or more virtual machines to guest software, the processor comprising:

• a control register to store a page directory base address corresponding to an address space;
• a translation lookaside buffer having entries including an address space identifier field;
• and
• an execution logic to determine whether the address space of a second guest exists in a list of active address spaces in response to a move to control register instruction, and to switch between the address space of a first guest and the address space of the second guest without flushing the translation lookaside buffer in response to a determination that the address space of the second guest is present in the list of active address spaces, the address space of the first guest corresponding to a first address space identifier and the address space of the second guest corresponding to a second address space identifier.