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Virtualization Concepts
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In this section we try to lay the groundwork for common virtualization concepts and terminologies that appear in the rest of this chapter and that are used in everyday discussions about virtualization: Guest OS (VM) This is also known as a virtual machine (VM) It is the operating system that is being virtualized Host OS This is the system or host on which the guest operating systems (VM) run
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Hypervisor (VMM) A hypervisor is also referred to as the virtual machine monitor (VMM) A hypervisor provides a CPU-like interface to virtual machines or applications The hypervisor is at the heart of the entire virtualization concept It can be implemented with support built natively into the hardware, purely in software, or a combination of both Hardware emulation This is when software is used to emulate the instruction set of different CPU architectures The resulting VMs that run in this type of environment typically run slowly, due to the sheer amount of processing required for the emulation An example virtualization solution that provides hardware emulation is Bochs (http://bochssourceforgenet) Full virtualization This is also known as bare-metal or native virtualization The host CPU(s) has extended instructions that allow the VMs to directly interact with it Guest operating systems that can use this type of virtualization do not need any modification As a matter of fact, the VMs do not know and need not know that they are running in a virtual platform Hardware virtual machine (HVM) is a vendor-neutral term used to describe hypervisors that support full virtualization In full virtualization, the virtual hardware seen by the guest OS is functionally similar to the hardware the host OS is running on Examples of vendor CPUs and platforms that support the required extended CPU instructions are Intel Virtualization Technology (Intel VT), AMD Secure Virtual Machine (SVM/AMD-V), and IBM System z series Examples of virtualization platforms that support full virtualization are kernelbased virtual machines (KVM), Xen, IBM s z/VM, VMware, Virtualbox, and Microsoft s Hyper-V
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Paravirtualization This is a virtualization technique Essentially, this class of virtualization is done via software Guest operating systems that use this type of virtualization typically need to be modified To be precise, the kernel of the guest OS (VM) needs to be modified to run in this environment This required modification is the one big disadvantage of paravirtualization This type of virtualization is currently relatively faster than its full virtualization counterparts Examples of virtualization platforms that support full virtualization are Xen and UML (User Mode Linux)
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VIRTUALIZATION IMPLEMENTATIONS
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There are many virtualization implementations that run on Linux-based systems (and Windows-based systems) Some are more mature than others Some are easier to set up and manage than others, but the objective remains pretty much the same across the board We ll briefly look at some of the more popular virtualization implementations in this section
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QEMU
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QEMU falls into the class of virtualization called machine emulators It can emulate a completely different machine architecture from the one on which it is running (eg, emulating an ARM architecture on an x86 platform) The code for QEMU is mature and well tested, and as such, it is relied upon by many other virtualization platforms and projects
This is a popular virtualization implementation, with a large community following The code base is quite mature and well tested It supports both the full and paravirtualization methods of virtualization Xen is considered a high-performing virtualization platform It is commercially backed by Citrix Systems, and the Xen open source interest is maintained at wwwxenorg
User-Mode Linux (UML)
This is one of the earliest virtualization implementations for Linux As the name implies, virtualization is implemented entirely in user space This singular attribute gives it the advantage of being quite secure, since its components run in the context of a regular user Running entirely in user space also gives this implementation the disadvantage of not being very fast More information about UML can be found at http://user-mode-linux sourceforgenet
Kernel-based Virtual Machines (KVM)
This is the first official Linux virtualization implementation to be implemented in the kernel It currently supports only full virtualization KVM is discussed in more detail later on in this chapter
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