Judith S. Hall and Paul T. Robinson. Virtualizing the VAX Architecture. In Proceedings of the 18th Annual International Symposium on Computer Architecture, pages 380--389. ACM, May 1991.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....intervention. Borden et al. report that this feature allows a virtual machine with dedicated I O devices to achieve within 1 2 of native hardware performance. A PC based server platform with similar partitioning features would allow VMware s virtual machines to do the same. Hall and Robinson [8] describe virtualizing the VAX architecture which, like the IA 32 architecture, is not naturally virtualizable and has more than two protection rings. They rely on modifications to the VAX architecture as well as the microcode. In contrast, VMware s virtualization technology does not require any ....

Judith S. Hall and Paul T. Robinson. Virtualizing the VAX Architecture. In Proceedings of the 18th Annual International Symposium on Computer Architecture, pages 380--389. ACM, May 1991.

....Pentium processor, contained several sensitive, unprivileged instructions. It also had four rings. The security kernel designers modified the VAX processor microcode to make it virtualizable. The four instructions that prevented virtualization on the VAX processor were: CHM, REI, MOVPSL, and PROBE [13]. The CHM instruction switches to a mode of equal or increased privilege. The REI instruction switches to a mode of equal or decreased privilege. The MOVPSL instruction is used to read the Processor Status Longword (similar to the machine status word in the Intel architecture) The PROBE ....

J. Hall and P. T. Robinson. Virtualizing the VAX Architecture. In Proceedings of the 18th International Symposium on Computer Architecture, pages 380--389, Toronto, Canada, May 1991.

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