Formal Requirements for Virtualizable Third Generation Architectures – Popek & Goldberg With thanks to Alfred Bratterud for pointing me. Formal Requirements for. Virtualizable Third. Generation Architectures. Gerald J. Popek. University of California, Los Angeles and. Robert P. Goldberg. The Popek and Goldberg virtualization requirements are a set of conditions sufficient for a computer architecture to support system virtualization efficiently. They were introduced by Gerald J. Popek and Robert P. Goldberg in their article “Formal Requirements for Virtualizable Third Generation Architectures”.
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All sensitive instructions in the PowerPC instruction set are privileged. A trapsuch as the memorytrap above, automatically saves the current state of the machine and passes control to a pre-specified control routine by changing the PSW to the values specified in E. Going forward I believe that we should let requirement 1 from Popek-Goldberg go.
In this model, for simplicity, we have departed slightly from most common relocation systems by assuming it to requirments active in the supervisor as well as user mode.
Fill in your details below or click an icon to log in: The IA instruction set of the Pentium processor contains 18 sensitive, unprivileged instructions. Notify me of new posts via email.
Sorry, your blog cannot share posts by email. It is assumed that a subset of the instruction set is available only when in system mode and that memory is addressed relative to a relocation register.
Formal Requirements for Virtualizable Third Generation Architectures
A virtual machine monitor VMM, also called hypervisor is the piece of software that provides the abstraction of a virtual machine. This guarantees the resource control property. This additional processing however makes the VMM virtualizale efficient in theory,  but hardware traps have non-negligible performance cost as well. The effort needed to support virtualization on the IA architecture is described in a article by Magenheimer and Christian.
They are merely characteristics of the machine which may be determined from tjird the principles of operation.
Popek and Goldberg virtualization requirements – Wikipedia
Such machines have a processor, and linear uniformly addressable memory. The holding of the equivalence property also follows. Smith, James; Ravi Nair There are three properties of interest when analyzing the environment created by a VMM: The Popek and Goldberg virtualization requirements are a set of conditions sufficient for a computer architecture to support system virtualization efficiently.
Communications of the ACM. Attempting to reset the R relocation-bounds register is the primary example in our skeletal model. If the processor were to be treated as a resource, a halt would be another. This page was last edited on 28 Augustat And how do we now whether a given piece of hardware can support virtualization or not?
Adams, Keith; Agesen, Ole October 21—25, In the terminology used in the reference book of Smith and NairVMMs are typically assumed to satisfy the equivalence and resource control properties, and those additionally meeting the performance property are called efficient VMMs. One approach, known as patchingadopts techniques commonly used in dynamic recompilation: To explain these, the authors introduce the notion of a virtual machine monitor… What is a Virtual Machine Monitor?
This is the question the vast majority of the paper is dedicated to. Computer architecture Virtualization software. A behaviour sensitive instruction is one whereby the effect of its execution is dependent on the value of the relocation bounds register location in real memory or processor mode.
This is what distinguishes a VMM from the more general class of hardware emulation software.
Popek and Goldberg virtualization requirements
The allocator decides what system resources are to be provided e. The Motorola MC has a single unprivileged sensitive instruction:.
Suppose an instruction produces some address awe check and then find the true address as follows:. If we consider something like uKVM as a replacement for Qemu we architecture up with a significantly more secure and performant system.
Key to understand whether or not it is possible to virtualize architetures given piece of hardware is to divide the instructions into groups. But architectures can still be fully virtualized in the x86 case meaning at the CPU and MMU level by using different techniques like binary translation, which replaces the sensitive instructions that do not generate traps,  which are sometimes called critical instructions.
Sensitive instructions may be either control sensitive, or behaviour sensitive. Popek and Goldberg present the following sufficient conditions.