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Windows Server Forum / Virtual Server / December 2004Is it a real VM or just Emulation?
I am reading http://www.redbooks.ibm.com/redpapers/pdfs/redp3912.pdf and it seems that Virtual Server (I guess it applies to Virtual PC too) is not making use of the VM feature of the IAPX architecture but it is just "soft PC" emulation. Am I correct? I don't have access to the code, but I'm willing to bet VPC and VS don't use x86 virtual processor mode. IIRC, that processor mode is to emulate older x86 processors like i386, not for Pentiums or later. I found some interesting reading on the subject at the wikipedia: http://en.wikipedia.org/wiki/X86 http://en.wikipedia.org/wiki/Popek_and_Goldberg_virtualization_requirements The latter link describes an Association for Computing Machinery (ACM) article on Formal Requirements for Virtualizable Third Generation Architectures. enjoy, Richard > I am reading http://www.redbooks.ibm.com/redpapers/pdfs/redp3912.pdf and it > seems that Virtual Server (I guess it applies to Virtual PC too) is not > making use of the VM feature of the IAPX architecture but it is just "soft > PC" emulation. Am I correct? Hi Richard, You are correct that this functionality is only for older processors - however we do use the native v86 functionality when possible (which is basically only useful for old DOS programs)  SignatureCheers, Benjamin Armstrong =============================== Virtual machine Program Manager This posting is provided "AS IS" with no warranties, and confers no rights. You assume all risk for your use. > I don't have access to the code, but I'm willing to bet VPC and VS don't > use x86 virtual processor mode. IIRC, that processor mode is to emulate [quoted text clipped - 18 lines] >> "soft >> PC" emulation. Am I correct? Hi Sam, Virtual Server and Virtual PC do do true virtualization of the x86 processor - which is far beyond the scope of the functionality mentioned in this redbook. SignatureCheers, Benjamin Armstrong =============================== Virtual machine Program Manager This posting is provided "AS IS" with no warranties, and confers no rights. You assume all risk for your use. > I am reading http://www.redbooks.ibm.com/redpapers/pdfs/redp3912.pdf and it > seems that Virtual Server (I guess it applies to Virtual PC too) is not > making use of the VM feature of the IAPX architecture but it is just "soft > PC" emulation. Am I correct? |
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