Each virtual machine is called a guest machine. . A full virtualization is used to emulate a complete hardware environment, or virtual machine, in which an unmodified guest operating system (using the same. 1. by wing. Hypervisor –. In _______ the virtual machine simulates hardware, so it can be independent of the underlying system hardware. Full virtualization vs. . These can be network connections or, as one of the most common application areas, the environment of an operating system. . . It generally increases IT agility, increase scalability, improve flexibility, saves costs, etc. A Type 1 hypervisor runs on bare metal and a Type 2 hypervisor runs on top of an operating system. (within 10-30% of native iron optimized, often much worse) Para Virtualization = faster - because the 'guest' os has been modified to actually help the 'host' layer. Virtual machines are. Paravirtualization là một kỹ thuật ảo hóa cung cấp giao diện cho các máy ảo tương tự như phần cứng cơ bản của chúng. Hardware virtualization vs. Xen offers two types of virtualization: paravirtualization and full virtualization. Paravirtualization Providers. In full virtualization, the guest operating system runs on top of a hypervisor that sits on the bare metal. LIBVF. Specifically, KVM lets you turn Linux into a hypervisor that allows a host machine to run multiple, isolated virtual environments called guests or virtual machines (VMs). Page 515, Problem 8 What is the difference between full virtualization and paravirtualization? Which do you think is harder to do? Explain your answer. Point out the wrong statement. The real game-changer for full virtualization was the creation of hardware virtualization extensions for modern processors, such as the Intel Virtualization Technology and Advanced Micro Devices virtualization processor command set extensions. 9 Xen’s CPU Paravirtualization Delivers Performance Benefits with Maintenance Costs. paravirtualization is higher than full virtualization and this data certainly affects the carbon emissions. The hypervisor software does the task of managing the shared physical hardware resources between the guest operating. Full virtualization and paravirtualization (PV) are simply two types of server virtualizations. I know the point was to provide a really simple schema to help understand the differences between virtualization types but I don’t think it should be presented like that. Dalam paravirtualization, item operai tamu ecara ekpliit porting ebelum mengintal mein virtual karena item operai tamu yang tidak dieuaikan tidak dapat berjalan di ata monitor mein. Stability/Performance is close to the real servers and hardware. The hypervisor used in this type is known as Type 2 hypervisor. VMware also has a host limit of 120 virtual machines vs Citrix Hypervisor 's 75 virtual machines which allows for. 3. Hello Guys Hope you are all doing well. execution provides Full Virtualization as the guest OS is fully abstracted (completely decoupled) from the underlying hardware by the virtualization layer. In addition, Xen supports both full virtualization and quasi Virtualization (the modified client operating system needs to be modified, and the modified client operating system can have better performance). Continue Reading. host machine. Paravirtualization adalah teknik virtualisasi yang. 6. I got a PDF name "VMware_paravirtualization. Hardware-Assisted Virtualization. In PV, VM will aware of that IO should be handled by host and VM will generate a direct call to the Hypervisor. . Q. IO is a Virtualization Framework (Libvirt's alternative) for simplifying the GPU Virtualization. The intent of the modified interface is to reduce the portion of the guest's execution time. . KVM is a kernel module, and works with the default (non-Xen) kernel. Hardware-assisted virtualization is a technology that allows for a CPU instruction set communication in which the VMM runs in a new root level mode below the OS kernel level. Virtualization, paravirtualization, and emulation technology, or some combination may be used for the implementation of virtual machines. With full virtualization, VMs don’t. A computer on which a hypervisor is running one or more virtual machines is defined as a host machine. AWS offers EC2 instances in both. It differs from other forms of. This type of virtualization is far easier to execute than full virtualization. Advantages of virtualization include: Server consolidation. Virtualization or virtualisation (sometimes abbreviated v12n, a numeronym) is the act of creating a virtual (rather than actual) version of something, including virtual computer hardware platforms, storage devices, and computer network resources. In full virtualization, an unmodified guest OS runs in isolation on a virtual platform using a hypervisor. The original idea behind paravirtualization, and originally the only type of virtualization in Xen, was one where Xen presented itself as its own PC-incompatible machine type using the x86 instruction set, and you had to port the boot. Virtualization is about abstracting application, operating system, network or storage away from the. The majority of guest instructions that are non-privileged are executed directly, and privileged ones trap and a emulated one-by-one. Full Virtualization adalah teknik virtualisasi yang digunakan untuk menyediakan jenis tertentu dari virtual machine yaitu yang merupakan simulasi lengkap dari hardware yang mendasarinya. The introduction of virtualization in the late 1960s, early 1970s. Our hypervisor supports two primary types of virtualization: paravirtualization (PV) and hardware virtualized machine (HVM) also known as “full virtualization”. . Full virtualization is the only option that requires no hardware assistHardware vs. This chapter assumes that a Xen-enabled kernel and associated tools are installed and that the Xen kernel is the currently running kernel. Oracle VM VirtualBox enables the exposure of a paravirtualization interface, to facilitate accurate and efficient execution of software within a virtual machine. VMWare has double the amount of virutal CPUs than Citrix Hypervisor. Full Virtualization vs Para Virtualization vs Hardware Assisted Virtualization. Q. Here is why: Some things work others don't. We would like to show you a description here but the site won’t allow us. A software hypervisor is installed on a physical server and a guest OS is installed into the environment. Para-virtualization is ideal for. Type 2 hypervisors is that Type 1 runs on bare metal and Type 2 runs on top of an operating system. . Similar to full virtualization, guest operating systems can be installed without modification. You also have to distinguish if you talk about the CPU or the I/O devices/drivers. For an analogy, think of full virtualization as attempting to navigate your way around a. The main differences between PV and HVM AMIs are the way in which they boot and whether they can take advantage of special hardware extensions (CPU, network, and storage) for better. Here, you will learn about the various key differences between Full Virtualization and Paravirtualization multitasking in operating systems. VMware Understanding Full Virtualization, Paravirtualization, and Hardware Assist CPU Virtualization 5 Figure 6 – The Paravirtualization approach to x86 Virtualization Technique 2 – OS Assisted Virtualization or Paravirtualization “Para-“ is an English affix of Greek origin that means "beside," "with," or "alongside. This white paper attempts to clarify the various techniques used to virtualize x86 hardware, the strengths and weaknesses of each, and VMware™s community. The performance of full virtualization may not be ideal, because it involves binary translation which is rather time-consuming. Full virtualization comes with a performance penalty. Both guest types can be used at the same time on a single Xen system. KVM allows the running of the CPU that comes with the virtualization support. For example, a real physical machine would be created into virtual machines. First, I’ll go with the schema. in some sites they mentioned that without VMware Tools that is "Full Virtualization" after Tools that is "Paravirtualization". . HVMs can use hardware extensions which provide very fast access to underlying hardware on the host system . Paravirtualization is complementary to server virtualization and is used to make an OS or device virtualization-aware. Paravirtualization:- Paravirtualization is different from full virtualization, where the unmodified OS does not know it is virtualized and sensitive OS calls are trapped using. These are part of a bigger category. The performance of full virtualization on the x86. Paravirtualization. The guest OS is completely decoupled from the underlying hardware. . Technique 2 OS Assisted Virtualization or. This definition suits both emulation and type 2 hypervisor. Hardware-assisted virtualization is also called native virtualization, accelerated virtualization, or hardware VM, depending on the vendor. Full virtualization is the only option that requires no hardware assistUnder paravirtualization the kernel of the guest operating system is modified specifically to run on the hypervisor [from here], where hypervisor is a program that runs directly on the hardware of the host system in ring 0. . paravirtualization: Key differences. It is a sort of para Virtualization only but with a little difference. Full Virtualization vs Paravirtualization 5. Computer Science CS677: Distributed OS Lecture 5,. Paravirtualization adalah teknik virtualiai yang menyediakan antarmuka ke mein virtual yang mirip dengan perangkat kera yang mendaarinya. Rather than have a variety of device emulation mechanisms (for network, block, and other drivers), virtioprovides a common front end for these device emulations to standardize the interface and increase the reuse of code across the platforms. With the introduction of hardware. Paravirtualization (PV) Paravirtualization refers to communication. assisted virtualization in more detail in the next section. Cloud Computing-Tutorial4|Full virtualization and paravirtualization0:00 Intro1:51 Full virtualization4:10 ParavirtualizationSee complete playlistCloud Compu. GPU virtualization is used in various applications such as desktop virtualization, cloud gaming and computational science (e. This creates a virtual machine that can largely be used as a real one. This technique is fast and provides near native speed in comparison to full virtualization. One of the key benefits of containerization is that you can often pack many more containers on a host machine than you can on virtual machines. In fact, there is actually a middle ground between hardware and software: There is Full hardware (HVM), "partial" hardware (PVM), and Pure Software (SW). First released in 2007, KVM is built into Linux 2. . With full virtualization, operating systems and their hosted software are run on top of virtual hardware. . MMU tough to. virtio was developed by Rusty Russell in support of his own virtualization solution called lguest. Paravirtualization cannot support unmodified OS. Among the main benefits provided by paravirtualization is the boost in speed. In full virtualization, the hardware architecture is completely simulated, enabling an unmodified guest operating system to be run in isolation. . The guest operating system does not require any modifications. In paravirtualization, the virtualized operating system operates on a tweaked version of the OS. Full virtualizationBased on the textbook: Modern Operating Systems, answer the following questions (if the page/ problem numbers are different in your book, use the text below): 1. Paravirtualization attempts to resolve issues found in full virtualization. Thus between the two, Para-Virtualization incurs lower overhead. Xen offers two types of virtualization: paravirtualization and full virtualization. The interface was simpler for me understand since I don't have a heavy background with Linux. In paravirtualization, these instructions are handled at compile time when the non-virtualizable OS instructions are replaced with hypercalls. . The solution was a combination of binary translation and direct execution on the processor that allowed multiple guest OSes to run in full isolation on the same computer with readily affordable virtualization overhead. Welcome back! Today we will look at Full Virtualization, using either Software assisted full or Hardware assisted full. Emulation Virtualization – The virtual machine simulates the hardware and becomes independent of it. wtfexecution provides Full Virtualization as the guest OS is fully abstracted (completely decoupled) from the underlying hardware by the virtualization layer. On the other hand, paravirtualization is more secure than full virtualization. Type- 1 virtualization enables the hypervisor to run in Type-1 and Type-2 Virtualization techniques can be further classified into full virtualization, para virtualization, and Dynamic Binary. Compared to traditional full virtualization, paravirtualization can reduce overhead and improve system performance. The unique KVM model allows for full virtualization and customized kernels (the core component of computer operating systems), allowing you the opportunity to set limits for the resources used, it. Ideally this should work in this order: Full Virtualization = slow due to emulation overhead. This imposes such a burden on the host computer, it effectively limits. In comparison to traditional full virtualization, paravirtualization can cut down on overhead and improve system performance. as is the case with full virtualization (such as VMware ESXi, QEMU, or Hyper-V) and paravirtualization (such as Xen or User-mode Linux). The savings that tens of thousands. This mode allows you to take advantage of the x86 virtual container technologies in newer processors for improved performance. Answer (1 of 2): Full Virtualization is virtualization in which the guest operating system is unaware that it is in a virtualized environment, and therefore hardware is virtualized by the host operating system so that the guest can issue commands to what it thinks is actual hardware, but really a. This is very successful when computer resources are shared. paravirtualization Join the green groups on My. Paravirtualization may allow the virtual machine monitor (VMM) to be. This means that KVM is smaller and easier to use. In paravirtualization, the guest operating system is explicitly ported before installing a virtual machine because a non-tailored guest operating system cannot run on top of a virtual machine monitor (VMM). In paravirtualization, the virtualized OS runs a modified version of the OS, which results in the OS knowing that it's virtualized. Prior to virtualization, engineers and admins relied on key punches, batch jobs and a single OS to satisfy IT operational needs. Folks on reddit tested it for gaming and came up with a list you can see here. These virtualization techniques are used to virtualize various IT resources, including hardware, software, desktops, and entire IT. Hardware vs. Emulators generally can't use virtualization, because that would make the abstraction somewhat leaky. CentOS. 3. 8 Hardware Assist is the Future of Virtualization, but the Real Gains Have Yet to Arrive. In the early days of virtualization (at least in the x86 world), the assumption was that you needed your hypervisor to provide a virtual machine that was. This enables much more efficient communication between the OS and the physical hardware, as the hardware devices can be addressed. Its type includes Native hypervisor and Hosted hypervisor. You can only implement. In this, under "Summarizing the. Interrupts and timers. This is probably done by removing the performance. Paravirtualization is a type of virtualization in which a guest operating system (OS) is recompiled, installed inside a virtual machine (VM), and operated on top of a hypervisor program running on the host OS. This environment, called a "virtual. The virtual machine permits the execution of the instructions in addition to running the. . When we describe VirtualBox as a "virtualization" product, we refer to "full virtualization", that is, the particular kind of virtualization that allows an unmodified operating system with all of its installed software to run in a special environment, on top of your existing operating system. 它使用Hypervisor(虚拟机管理程序)分享存取底层的硬件,如图2， 但是它的客户操作系统集成了虚拟化方面的代码. ᲕᲘᲓᲔᲝ: Full Virtualization vs. When entire operating systems cannot run in the virtual machine, but some or many applications can, it is known as Partial Virtualization. Kernel-based Virtual Machine (KVM) is an open-source full virtualization solution in the Linux kernel on x86 processors and allows users to turn it into a hypervisor. Paravirtualization. It identifies traps, responds to privileged CPU instructions, and handles. IDE support (for full virtualization) e1000 support (for full virtualization) For standard paravirtualized KVM Linodes, add the following to your kernel . Full virtualization. Emulation. Diana Lam August 31, 2015 10:40. Here’s a list of software under this type: VMware workstation (32-bit guests) Virtual PC. Emulation, also known as full virtualization runs the virtual machine OS kernel entirely in software. Check out the full Advanced Operating Systems course for free at: Georgia Tech online Master's program: main difference between them is that emulation is the computer program's ability in an electronic device to emulate the behavior of another program or device. What is full virtualization, partial virtualization and paravirtualization?Full Virtualization and Binary Translation –. 3. In this technique of virtualization unmodified guest is OS and no API are made. The software then runs on an emulation of system A. Examples of full virtualization include Microsoft and Parallels systems. Full virtualization vs. VM Guests. x86) more privilege levels needed. Video: Full Virtualization vs. Creating a virtual machine over existing. Before making the comparison, we will first know about Emulation and. UnsafePantomime • 1 yr. Paravirtualization, on the other hand, is a lighter form of virtualization. Paravirtualization. These interfaces require the guest operating system to recognize their presence and make use of them in order to. paravirtualization. KERNEL-BASE VIRTUAL MACHINE (KVM) ผู้สร้าง KVM มีชื่อว่า Avi Kivity และ Morcelo Tosatti ได้สร้าง KVM ขึ้นมาเพื่อทำ virtualization type – 1 และเป็น Paravirtualization (Intel VT, AMD-V) บน Linux ตัว guest OS ที่สร้างบน. In the case of para-virtualization, the source code has already been modified. execution provides Full Virtualization as the guest OS is fully abstracted (completely decoupled) from the underlying hardware by the virtualization layer. . Software Virtualization. Keywords : Green Computing, Virtualization, Full Virtualization, Paravirtualization, Carbon EmissionsXen is an open source hypervisor based on paravirtualization. KVM currently only supports hardware-assisted full-virtualization (although paravirtualization support is being worked on). By Stephen J. . . Guest operating systems in full virtualization systems are generally faster than other virtualization schemes: c. This was accomplished by allowing the OS to interact with the hypervisor directly to effectively offload some of the most time-consuming tasks from hypervisors that otherwise implement a full software-based VM. Partial virtualization was an important historical milestone on the way to full virtualization. . Therefore they would trap. Paravirtualization. Some guest operating systems hosted in full virtualization mode can be configured to use drivers from the SUSE Virtual Machine Drivers Pack (VMDP) instead of drivers included in the operating system. 4. Years ago, AWS would encourage users to use Paravirtualized guest VMs, because they were then considered more efficient than HVM. The three types of popular server virtualizations are OS virtualization, hardware emulation and paravirtualization. Merupakan sebuah teknik virtualisasi dengan melakukan eksekusi permintaan dari guest(OS) sehingga meniru perilaku kerja. Paravirtualization. Hyper-V and ESXi use full virtualization. But the Guest OS should be modified and installed with the drivers (block and network) through which VM kernel. Paravirtualization (PV) is an efficient and lightweight virtualization technique introduced by the Xen Project team, later adopted by other virtualization solutions. Hypervisor cannot allow that. Full virtualization is when a hypervisor provides complete abstraction of the guest OS, which means the guest OS doesn't acknowledge the. All replies. . In 1998, VMware figured out how to virtualize the x86 platform, once thought to be impossible, and created the market for x86 virtualization. There are two types of hypervisors, according to their place in the server virtualization structure: Type 1 Hypervisors, also known as bare-metal or native. Consequently, the guest OS is unaware that it is being virtualized. When compared on ease to impellent, Partial virtualization comes before full virtualization. Virtualization is the "creation of a virtual (rather than actual) version of something, such as a server, a desktop, a storage device, an operating system or network resources". 5 . In this embedding virtual machine software into the servers hardware component. ibm. Hardware virtualization is the virtualization of computers as complete hardware platforms, certain logical abstractions of their componentry, or only the functionality required to run various operating systems. It takes advantage of the latest CPU technology for x86, Intel VT, and AMD-V. Please be aware that in earlier days full virtualization meant that really the complete. The host of course is a bare metal server. The hypervisor in turn performs the task on behalf of the. Chose VMware ESXi. Which operating system suitable with paravirtualization ? ThanksSubtypes: Full Virtualization – Guest software does not require any modifications since the underlying hardware is fully simulated. That is why a classic VMM executes guests with "trap-and-emulate" approach. May 20, 2020Full virtualization is less secure than paravirtualization. Para-virtualization enables multiple guest operating systems to work with the host operating syst. Among the full virtualization techniques, hardware assisted model has the lowest and software emulation has the highest overhead. Paravirtualization was once a way to get more performance out of virtualization while having proper-ish separation though nowadays we mostly use full virtualization. . Gambar 2 jenis Full Virtualization. Types of Server virtualization : 1. Examples: Vmware. Rep: HVM vs PV (Xen Full virtualization (HVM) Xen Paravirtualization (PV)) Paravirtualisation is always better. Providers of IT consulting services recognize four basic forms of virtualization: full virtualization, virtual machines virtualization, operating system level virtualization, and paravirtualization. Oracle VM VirtualBox enables software in the virtual machine to run directly on the processor of the host, but an array of complex techniques is employed to intercept operations that would interfere with your host. 0, Xen also supports Hardware-Assisted Virtualization (HVM) Virtualization support was added to the x86 ISA in new processors (such at Intel VT-x or AMD-V) This enables full virtualization without the need for modifying the Guest OS. In 1998, VMware figured out how to virtualize the x86 platform, once thought to be impossible, and created the market for x86 virtualization. Full virtualization requires that the host operating system provide a virtual machine interface for the guest operating system and that the guest access hardware through that host VM. The reality is that paravirtualization is an old and useful virtualization technique that does deliver04-21-2010 06:20 AM. Difference Between Full Virtualization and Paravirtualization Analysis of Algorithms Algorithms Misc Algorithms In this post, we will understand the differences between full virtualization and paravirtualization Full Virtualization This process was introduced by IBM in the year 1966. . . Whenever the guest attempts to do something that. Hardware extensions help the. Full virtualization is a type of server virtualization in which a hypervisor distributes and allocates hardware resources to completely isolated virtual servers. Full virtualization and paravirtualization are two popular types of server virtualization, differentiated primarily by the level of isolation they offer. In paravirtualization, these instructions are handled at compile time when the non-virtualizable OS instructions are. Virtualization hides the physical characteristics of a computing platform from the users, presenting instead. Often referred to as hybrid virtualization, this type is a combination of full virtualization or paravirtualization combined with I/O acceleration techniques. Paravirtualization. Types of Virtualization:3. paravirtualization? There are various types of virtualization, such as full virtualization and paravirtualization. Historically, paravirtualization arose as a way to get better performance compared to full, software-emulated virtualization. 3. In paravirtualization, the guest OS. The solution was a combination of binary translation and direct execution on the processor that allowed multiple guest OSes to run in full isolation on the same computer with readily affordable. What differentiates the server virtualization types is how they allocate physical server. Full virtualization vs. g. Hyper-V: Presents a Microsoft Hyper-V hypervisor interface which is recognized by Windows 7 and newer operating systems. paravirtualization: Key differences Full virtualization and paravirtualization both enable hardware resource abstraction, but the two technologies differ when it comes to isolation levels. support for unmodified application binnaries; support full multi-application OS; should obtain high performance and strong resourse isolation; completely hiding the effects of resource virtualization; Xen vs Denali. Grafik perbandingan;. The concept of Paravirtualization is very similar to that of the hypervisor principle. From Wikipedia, the free encyclopedia. In the case of Binary translation, the native OS must first scan the guest OS instruction stream and make modifications to the stream as needed. hi. full virtualization (9 answers). Design Goal: Keep the hypervisor layer as small and as simple as possible. On the other hand, hardware-assisted virtualization eliminates the need for binary. . There are two common approaches to virtualization - full virtualization and para-virtualization. In this approach, the Guest OS is placed on a higher ring and the kernel code is translated by the hypervisor (virtualization software) to have the effect on the virtual hardware on which it. Full Virtualization: Virtual machine simulates hardware to allow an unmodified guest OS to be run in isolation. Paravirtualization Blog Virtualization Post Overview Virtualization is the creation of multiple logical systems from a single physical. Today, hardware virtualization is often called server virtualization or, simply, virtualization . As the OS is interfacing directly with the hypervisor, with no extra steps in between, this provides a smoother, faster experience. In this technology, guest OS is modified with an interface to host hardware to be able to communicate and operate seamlessly. The guest OS is not aware it is being virtualized and requires no modification. Full virtualization and paravirtualization both enable hardware resource abstraction, but the two technologies differ when it comes to isolation levels. In full virtualization, guest OS is completely isolated by the virtual machine from the virtualization layer and hardware. Paravirtualization is different from full virtualization, where the unmodified OS does not know it is virtualized and sensitive OS calls are trapped using binary translation. Full virtualization with binary translation. )SaaS (Software as a Service) b. Un otrādi, paravirtualizācijā hiperzvanus izmanto virtualizējamu OS instrukciju vietā, un viss šis process notiek. That stands to reason, because each VM is a self-contained. There are two types of Full virtualizations in the enterprise market. PVH is the new mode, which we expect to be a sweet spot between full virtualization and paravirtualization: it combines the best advantages of Xen’s PV mode with full utilization of hardware support. Hardware-Assisted Full Virtualization. This permits more efficient interaction between the OS and the physical hardware. For sharing computer resources among multiple users, this technique has provided successful results. Emulation is probably the virtualization technique that most of us think about when we think about hardware. Paravirtualization - a guest operating system is modified to use only instructions that can be virtualized. Paravirtualization uses modified guest operating systems that we refer to as "enlightened" guests. It generally increases customer satisfaction. . The guest is unaware that it is being virtualized and requires. Sebaliknya, dalam paravirtualization, hypercall digunakan sebagai pengganti instruksi OS yang tidak dapat divirtualisasikan dan seluruh proses ini berlangsung pada waktu kompilasi di mana instruksi ini ditangani. Full virtualization requires that every salient feature of the hardware be reflected into one of several virtual machines – including the full instruction set, input/output operations, interrupts, memory access, and whatever other elements are used by the software that runs on the bare machine, and that is intended to run in a virtual machine. Virtualization and emulation are two technologies whose concepts are often confused, and the terms are sometimes mistakenly used interchangeably online. Full virtualization is the only option that requires no hardware assist or operating system assist to virtualize sensitive and privileged instructions. Q. Based on this approach, any OS can be virtualized with the help of Binary Translation and direct execution-based technique. Linux Amazon Machine Images use one of two types of virtualization: paravirtual (PV) or hardware virtual machine (HVM). Data is abstracted from the underlying hardware by the virtualization layer, isolating service requests from the physical hardware that facilitates them. Paravirtualization, on the other hand, is a lighter form of virtualization. . com virtio is an abstraction layer over devices in a paravirtualized hypervisor. e how many types of virtualization , para and. Full virtualization vs. Platform virtualization software, specifically emulators and hypervisors, are software packages that emulate the whole physical computer machine, often providing multiple virtual machines on one physical platform. Linux AMI virtualization types. KVM is a kernel module that only works with the default Linux kernel (we should not install it on the Xen one). Paravirtualization. The first three of these will all be classified as “HVM mode”, and the last two as “PV mode” for historical reasons. Moreover, all of these platforms support paravirtualization and full binary translation virtualization. fntlnz. full virtualization과 가장 큰 차이는 바로 guestOS가 Mgmt 단인 control domain (DOM 0)을 거치지 않고, Hypervisor와 바로 interaction 한다는 것이다.