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Hypervisor

A hypervisor, also known as a virtual machine monitor (VMM), is a software, firmware, or platform that creates, manages, and runs multiple s (VMs) on a single physical host by abstracting and partitioning the underlying hardware resources such as CPU, , , and I/O devices. This enables efficient resource sharing among isolated guest operating systems, supporting applications like consolidation, , and workload without requiring dedicated physical hardware for each. Hypervisors originated in the 1960s with early mainframe systems, such as IBM's CP-40 and CP-67 for the System/360, which introduced to enable and testing of operating systems like OS/360. The concept evolved through the 1970s and 1980s in mainframe environments before resurging in the early 2000s with x86 architectures, driven by open-source projects like (2003) and commercial solutions from , addressing demands for scalable data centers. Today, hypervisors are foundational to modern , powering platforms in enterprise IT, public clouds (e.g., AWS, ), and , with ongoing advancements in security, performance, and hardware-assisted features like VT-x and AMD-V. Hypervisors are classified into two primary types based on their deployment model. Type 1 (bare-metal or native) hypervisors run directly on the without an underlying operating , offering higher and for environments; examples include , , and KVM. Type 2 (hosted) hypervisors operate as applications on top of a conventional OS, providing greater flexibility and ease of use for and testing but with added overhead; notable examples are , Oracle , and Parallels Desktop. While some incorporate container-based (e.g., with ), these differ from traditional hypervisors by leveraging the kernel for lightweight isolation rather than full emulation.

Fundamentals

Definition and Overview

A hypervisor, also known as a virtual machine monitor (VMM), is a software layer that creates, runs, and manages multiple s (VMs) by abstracting and partitioning the physical hardware resources of a host system, including the CPU, , , and I/O devices. This abstraction allows each VM to operate as if it has dedicated access to the underlying hardware, enabling the simultaneous execution of multiple isolated operating systems on a single physical machine. The core functions of a hypervisor encompass to assign , , and to individual ; to ensure that activities in one VM do not affect others; of hardware interfaces to present virtualized devices to operating systems; and scheduling to manage the execution of on the physical . These functions collectively enable efficient of hardware while maintaining the illusion of independent environments for each VM. Hypervisors provide key benefits such as improved resource utilization by consolidating multiple workloads onto fewer physical servers, easier testing and development through disposable and isolated VM environments, enhanced via VM snapshots and rapid migrations, and greater workload portability that allows applications to move seamlessly between hosts without dependencies. First conceptualized in the for mainframe systems to maximize the use of expensive resources, hypervisors have evolved into a foundational in contemporary centers and infrastructures. In hypervisor design, partitioning refers to the division of physical resources among to prevent interference, while involves simulating hardware components for compatibility with unmodified guest software. achieves this through complete hardware simulation without altering the guest OS, whereas para-virtualization requires minor guest modifications to directly interact with the hypervisor for optimized performance. Representative implementations include for broad virtualization support and for open-source para-virtualization capabilities.

Types and Classification

Hypervisors are primarily classified into two categories based on their execution environment: Type 1 (bare-metal or native) hypervisors, which run directly on the host hardware without an underlying operating system, and Type 2 (hosted) hypervisors, which operate as applications on top of a host operating system. Type 1 hypervisors, such as , Microsoft Hyper-V, and in paravirtualized mode, provide direct access to hardware resources, enabling efficient management of multiple virtual machines. In contrast, Type 2 hypervisors, including and Oracle VM VirtualBox, rely on the host OS for , simplifying deployment but introducing an additional layer of overhead. This classification originates from the ring-based privilege model defined by Popek and Goldberg in their 1974 paper, where native hypervisors (Type 1) operate at a higher privilege level than the host OS kernel, typically in a hypothetical Ring -1, while hosted hypervisors (Type 2) run within the user mode (Ring 3) of the host OS kernel (Ring 0), necessitating traps to the host for privileged operations. Modern hardware support, such as Intel VT-x or AMD-V, facilitates this by introducing a root mode for the hypervisor, allowing it to intercept and manage sensitive instructions without compromising isolation. Beyond the Type 1 and Type 2 dichotomy, hypervisors can be further categorized by architectural design and virtualization techniques. Architecturally, they range from monolithic designs, where the hypervisor includes all components in a single kernel for simplicity and performance (e.g., VMware ESXi), to microkernel-based designs that modularize services for improved reliability and security (e.g., Microsoft Hyper-V). In terms of virtualization paradigms, full virtualization emulates the entire hardware environment, trapping and emulating all sensitive instructions to run unmodified guest OSes (e.g., VMware with binary translation); paravirtualization requires guest OS modifications to replace sensitive instructions with hypercalls for direct hypervisor communication, reducing overhead (e.g., Xen); and hardware-assisted virtualization leverages CPU extensions to trap sensitive instructions efficiently without emulation (e.g., KVM with VT-x). For resource-constrained environments, embedded hypervisors adapt these paradigms, often as lightweight Type 1 implementations to partition real-time and non-real-time tasks on systems-on-chip, such as Wind River Hypervisor or INTEGRITY by Green Hills Software. The foundational criteria for hypervisor classification, as outlined by Popek and Goldberg, revolve around instruction sensitivity and methods to ensure efficient . An instruction is deemed sensitive if its depends on the 's privilege mode (e.g., -sensitive instructions like mode switches or I/O operations that alter system state) or if it attempts privileged actions in user mode (e.g., -sensitive instructions like halting the or modifying page tables). Conversely, innocuous instructions, such as operations, logical shifts, or data movements, execute identically regardless of mode and require no or . For a to be virtualizable, all sensitive instructions must to the hypervisor (for ), and the hypervisor must precisely emulate their effects without altering (for ), while innocuous instructions execute natively in guest mode. Performance trade-offs between hypervisor types stem from their architectural positions: Type 1 hypervisors offer superior and by directly accessing , resulting in lower overhead (typically 1-5% CPU and 5-10% memory) and enhanced , as there is no OS to compromise. Type 2 hypervisors, however, incur higher overhead due to context switches through the OS, making them less suitable for high-performance workloads but easier to manage and install on existing systems.

History

Mainframe Origins

The development of hypervisors originated in the mainframe computing era of the 1960s, driven by the need for efficient time-sharing systems on large-scale hardware. In 1964, IBM initiated the CP-40 project as an experimental time-sharing system on a modified IBM System/360 Model 40, marking the first implementation of a hypervisor-like control program that partitioned the physical machine into multiple virtual environments for concurrent user sessions. This effort laid the groundwork for virtualizing mainframe resources, allowing multiple instances of operating systems to run isolated from one another while sharing the underlying hardware. Building on CP-40, the CP-67 system emerged in 1967 specifically for the IBM System/360 Model 67, which introduced dynamic address translation (DAT) hardware support for virtual memory. CP-67 enabled the creation of virtual machines primarily for testing and development of OS/360, supporting up to 32 simultaneous users by emulating the full System/360 instruction set and managing virtual storage to prevent interference between partitions. These early systems drew conceptual inspiration from time-sharing projects like MIT's Compatible Time-Sharing System (CTSS) and the subsequent Multics, which emphasized resource partitioning and multi-user access to foster interactive computing over batch processing. Key technical innovations included the trap-and-emulate mechanism, where privileged instructions from guest operating systems triggered traps to the control program for emulation, ensuring isolation without requiring guest modifications. By 1972, these research efforts culminated in VM/370, IBM's first production-ready virtual machine system for the System/370 family, which formalized hypervisor functionality for commercial deployment and supported virtual storage management across a range of mainframe models. VM/370 extended CP-67's capabilities, providing robust sharing for development, testing, and production workloads in enterprise environments. The foundational principles of these mainframe hypervisors were rigorously analyzed in Robert P. Goldberg's survey and formal work, which defined essential requirements for a virtual machine monitor (VMM), including the that a conventional can serve as a VMM if all sensitive instructions are either privileged or to the monitor. This analysis established criteria for equivalence and efficiency, influencing subsequent hypervisor designs by emphasizing , control, and minimal performance overhead.

Evolution to Modern Architectures

The transition of hypervisor technology from mainframe environments to commodity x86 systems in the 1980s and 1990s was marked by significant challenges due to the x86 architecture's lack of native support for virtualization, which required complex binary translation and emulation techniques to handle sensitive instructions and protect the host system. Early efforts influenced Unix-like systems through research aimed at enabling efficient virtualization on personal computers, culminating in VMware's founding in 1998 by Stanford researchers who developed the first x86 virtual machine monitor using dynamic binary translation to overcome these architectural limitations. This period highlighted the need for software-based solutions to virtualize non-virtualizable instructions, paving the way for broader adoption beyond specialized mainframes. The 2000s brought pivotal breakthroughs with the introduction of extensions, addressing x86's inherent deficiencies and shifting hypervisors from emulation-heavy designs to more efficient models. Intel launched VT-x in 2005 on select processors, adding instructions for ring transitions and to support direct execution of guest code. AMD followed with AMD-V (initially SVM) in 2006, providing similar extensions including nested paging to reduce hypervisor overhead from shadow page tables. Concurrently, open-source innovations like the hypervisor, released in 2003 by the , introduced , where guest operating systems are modified for explicit hypervisor cooperation, minimizing emulation needs and enabling near-native performance on unmodified x86 hardware. Key commercial milestones accelerated this evolution, with releasing ESX Server in 2001 as its first bare-metal hypervisor for enterprise x86 servers, focusing on resource partitioning without an underlying host OS. entered the market with Virtual Server 2004, a type-2 hypervisor hosted on Windows, followed by the native type-1 integrated into , leveraging VT-x and AMD-V for improved scalability. In the open-source domain, KVM () was merged into the in 2007, transforming the kernel into a full hypervisor through a loadable module that utilizes hardware extensions for low-overhead . These developments drove architectural shifts from software , which incurred high CPU overhead due to frequent traps and translations, to hardware-assisted that offloads critical operations like interrupt handling and paging to the processor, significantly reducing virtualization overhead in many workloads. This transition also fostered a divide between models, like VMware's ESX lineage emphasizing enterprise features, and open-source alternatives such as and KVM, which promoted community-driven innovation and cost-effective deployment in diverse environments. Up to 2025, recent milestones underscore ongoing refinements, including the Project's 4.19 release in July 2024, which introduced enhancements for architecture support, improved migration capabilities, and general improvements including new security advisories. In March 2025, the Project released version 4.20, featuring additional performance optimizations and support for newer hardware architectures. Broadcom's acquisition of , completed in November 2023 for approximately $69 billion, has reshaped market dynamics, prompting subscription-based licensing shifts that have significantly increased costs for some users (with reported increases ranging from 150% to 1,250%) and accelerated migration to alternatives like KVM, thereby diversifying the hypervisor landscape.

Implementations

x86 and PC Systems

The x86 architecture, widely used in personal computers and servers, presented significant challenges for virtualization in its early days due to its complex instruction set and lack of native support for trapping sensitive operations. Instructions like PUSHF and CLI could alter processor state in ways that violated Popek and Goldberg's virtualization requirements for efficient trapping, necessitating software techniques such as binary translation to emulate or modify guest code on the fly. VMware Workstation, released in 1999, pioneered this approach by dynamically translating non-virtualizable instructions while caching translated code for reuse, enabling full virtualization without hardware assistance. Hardware extensions addressed these limitations starting in the mid-2000s, introducing dedicated modes for virtualization. Intel's VT-x, first implemented in 2005 with certain Pentium 4 processors, added a VMX (Virtual Machine Extensions) mode that uses explicit VM-entry and VM-exit instructions to transition between guest and hypervisor contexts, reducing the need for software traps. Complementing this, Intel's Extended Page Tables (EPT), introduced in 2008 with the Nehalem microarchitecture, provide hardware-assisted nested paging for efficient memory address translation, eliminating much of the overhead from shadow page tables. Similarly, AMD's AMD-V, launched in 2006 with revisions of its K8 processors, offers comparable VM container modes for secure guest execution. AMD followed with Rapid Virtualization Indexing (RVI) in 2007 on Barcelona-based Opteron processors, enabling direct guest-physical to host-physical address mapping akin to EPT. These features, including support for extended page tables and I/O virtualization (VT-d for Intel, IOMMU for AMD), allow hypervisors to offload critical operations to hardware, improving scalability for multiple virtual machines. Prominent hypervisor implementations for x86 systems leverage these extensions for enterprise and desktop environments. VMware vSphere, a Type 1 bare-metal hypervisor, runs directly on hardware and supports large-scale deployments with features like distributed resource scheduling, utilizing VT-x and EPT for near-native performance. Microsoft Hyper-V, integrated into Windows Server since 2008, operates as a Type 1 hypervisor with tight coupling to the Windows kernel, enabling seamless management of virtual machines alongside native workloads via AMD-V or VT-x. On the open-source side, Kernel-based Virtual Machine (KVM), a Linux kernel module since 2007, pairs with QEMU for device emulation and provides hardware-accelerated virtualization on x86, often used in cloud infrastructures for its flexibility. For desktop use, Oracle VM VirtualBox serves as a Type 2 hosted hypervisor, running atop a host OS like Windows or Linux while exploiting VT-x or AMD-V for guest acceleration. With hardware support, x86 hypervisors achieve low virtualization overhead, typically under 5% for CPU-bound workloads and I/O operations in modern configurations, as traps for privileged instructions are minimized. For instance, EPT and RVI reduce memory management costs by up to 50% compared to software shadow paging, allowing efficient handling of guest page faults without frequent hypervisor intervention. VMware's vMotion exemplifies advanced capabilities, enabling live migration of running virtual machines between hosts with sub-second downtime, preserving memory state and CPU context for high-availability setups. In practice, x86 hypervisors facilitate server consolidation in data centers, where multiple underutilized physical servers are virtualized onto fewer hosts to optimize resource use and reduce costs. Desktop virtualization supports development workflows by isolating testing environments, allowing developers to run diverse OSes on a single PC without hardware partitioning. These applications highlight the synergy between x86 and software, driving widespread adoption in IT. Following Broadcom's acquisition of in 2023 and subsequent pricing changes in 2024, new Type 1 hypervisors have emerged as alternatives to vSphere, including HPE's VM Essentials released in 2024 and StorMagic's SvHCI in June 2024, supporting x86 hardware with features for simplified management and edge deployments.

Embedded and Specialized Systems

Embedded hypervisors, predominantly Type 1 bare-metal designs, are tailored for resource-constrained environments such as (IoT) devices and automotive systems, enabling the secure partitioning of multiple operating systems on a single platform. These hypervisors facilitate mixed-criticality systems by providing safety-certified partitions that isolate high-assurance applications, such as safety-critical automotive controls, from less critical ones, ensuring compliance with standards like for . Notable examples include Wind River Hypervisor, which supports in embedded automotive and applications, and INTEGRITY Multivisor from , a Type 1 hypervisor designed for secure hosting of guest operating systems in safety-critical embedded contexts. ARM-based architectures dominate embedded hypervisor implementations due to their prevalence in mobile and low-power devices, with added experimental support for the architecture in version 4.3, released in July 2013, enabling on ARM-based embedded systems. Integration with TrustZone enhances security by creating isolated execution environments, allowing hypervisors to leverage hardware-enforced secure and normal worlds for guest isolation without significant performance overhead. Real-time extensions are common, particularly for real-time operating systems (RTOS) like and ; for instance, Wind River's includes hypervisor capabilities that extend RTOS determinism to virtualized environments, enabling predictable execution in automotive and industrial scenarios. Key features of embedded hypervisors emphasize efficiency and reliability, including minimal footprints often under 1 MB to suit constrained hardware, as seen in microvisor designs that prioritize lightweight operation. Deterministic scheduling ensures bounded response times critical for real-time tasks, while hardware partitioning provides spatial and temporal isolation for security, particularly in where compliance with standards mandates time- and space-partitioned execution to prevent interference between applications. Prominent implementations include the OKL4 microvisor, developed in the by OK Labs and widely adopted in smartphones for secure partitioning of applications and OSes, enabling isolated execution of sensitive workloads like trusted virtual domains. Recent growth in has driven hypervisor adoption for and isolation, with the embedded hypervisor market projected to expand from USD 6.8 billion in 2024 to USD 13.6 billion by 2030, fueled by needs for low-latency, secure at the network edge. Challenges in embedded hypervisors revolve around power efficiency and interrupt latency, as virtualization overhead can increase energy consumption and delay real-time responses in battery-powered or timing-sensitive systems. Solutions include para-virtualized drivers, which modify guest OSes to communicate directly with the hypervisor, reducing trap-and-emulate overhead and improving interrupt handling efficiency in real-time embedded setups.

Operating System Integration

Guest OS Support

Hypervisors support guest operating systems through two primary virtualization approaches: , which enables unmodified guest OSes to run without alterations by emulating hardware and leveraging CPU assists like VT-x or AMD-V, and , which requires guest OS modifications or drivers to communicate directly with the hypervisor for improved performance. In , common for proprietary OSes like or distributions, the hypervisor traps and emulates sensitive instructions, allowing broad compatibility without guest awareness of the . , exemplified by Xen's PV mode, uses specialized drivers to replace hypercalls, optimizing I/O and memory operations for open-source guests like modified kernels, though it demands guest-side adaptations. Major hypervisors exhibit broad guest OS compatibility, encompassing editions (e.g., 2025, 2022, 2019), various distributions (e.g., , , , ), BSD variants, and even legacy mainframe systems like under . For cross-architecture support, tools like enable emulation of disparate instruction sets, such as running -based guests on x86 hosts or vice versa, facilitating testing and migration across platforms. and KVM similarly accommodate a wide array of x86 and guests, including and , ensuring versatility in enterprise deployments. Key mechanisms enhance guest OS accommodation, including for legacy or unmodified OSes, where the hypervisor dynamically rewrites sensitive guest instructions to safe equivalents, as seen in early implementations for x86 . Enlightenments, such as Hyper-V's Linux Integration Services (LIS), provide paravirtualized drivers built into modern kernels to optimize time synchronization, heartbeat monitoring, and synthetic device access, reducing overhead. Virtio standards, widely adopted in KVM and , standardize paravirtualized I/O devices like block storage and networking, allowing guests to bypass full for near-native through a common interface. Despite these capabilities, limitations persist, particularly with (ISA) mismatches, where running x86-only guests on hypervisors demands full via , incurring significant CPU overhead due to dynamic of incompatible instructions. Licensing constraints further restrict proprietary OSes; for instance, Standard permits only two licensed VMs per host under , requiring additional Datacenter edition licenses for unlimited instances, while products enforce strict partitioning rules in virtual environments to prevent over-licensing. To ensure reliable integration, hypervisors incorporate testing and processes, such as Tools, which install guest additions for enhanced graphics, file sharing, and quiescing during backups, verified against specific OS versions for seamless operation. Similarly, Hyper-V's LIS undergoes with distributions like , confirming compatibility for features like dynamic memory and shutdown coordination, with providing updated packages for older kernels to maintain support. These tools and certifications mitigate compatibility issues, enabling production-grade guest deployments across diverse OS ecosystems.

Host Interactions and Compatibility

Type 1 hypervisors, also known as bare-metal hypervisors, interact directly with the host hardware, bypassing any underlying operating system to eliminate overhead and enable efficient resource management. This direct control allows the hypervisor to handle CPU scheduling, memory allocation, and I/O operations natively, resulting in lower latency and higher performance for virtualized workloads. Management of Type 1 hypervisors typically occurs through dedicated consoles, such as VMware vCenter Server, which provides a centralized platform for configuring hosts, provisioning virtual machines, and monitoring cluster-wide operations. Type 2 hypervisors, in contrast, operate as user-space applications atop a host operating system like or , relying on the host OS for and resource sharing. This hosted model introduces some performance overhead due to context switching with the host but facilitates easier integration with host tools and extensions. For example, on , compatibility with host features is evident in setups like the 2 (WSL2), which utilizes lightweight components to run distributions seamlessly alongside applications, though it may conflict with other Type 2 tools like or when is enabled. Interactions between hypervisors and the host often involve API-driven mechanisms for tasks like provisioning and real-time monitoring. Libvirt, a widely used open-source library, exposes APIs for managing KVM environments, allowing administrators to script VM creation, migration, and status queries through tools like virsh or integrated platforms. Resource contention on the host is addressed via techniques such as CPU pinning, which dedicates specific physical cores to virtual machines to minimize interference from host processes, and memory ballooning, where the hypervisor inflates or deflates a balloon device in guest memory to reclaim unused pages dynamically. The KVM hypervisor inherently supports overcommitment of both CPU and memory, enabling more virtual resources to be allocated than physically available while relying on host scheduling to balance loads. Compatibility challenges in host interactions frequently stem from driver conflicts, where incompatible host or guest drivers disrupt passthrough or . Nested virtualization, which permits running one hypervisor within another, adds complexity; for instance, enabling inside a virtual machine requires explicit configuration of extensions like VT-x or AMD-V, but can lead to issues if not aligned with host firmware. Updates to underlying systems, such as recent enhancements for KVM, have improved overall by refining device and memory handling, though they occasionally introduce temporary incompatibilities that necessitate host reboots or module tweaks. To enhance portability and interoperability, standards like the (OVF) define a package for describing and distributing virtual machines across hypervisors, encapsulating configuration, disk images, and metadata in a vendor-neutral way. tools further aid host compatibility in environments; for example, integrates with hypervisors via KubeVirt, allowing unified management of virtual machines and containers on shared host infrastructure.

Security Considerations

Features and Benefits

Hypervisors deliver robust security through principles that resources among virtual machines (VMs), enabling secure multi-tenancy on shared . , such as Intel's Extended Page Tables (EPT) on x86 architectures, allows the hypervisor to independently map each VM's physical addresses to host , preventing unauthorized access or interference between guests. Similarly, CPU scheduling mechanisms assign virtual CPUs (vCPUs) to physical cores in a controlled manner, mitigating cross-VM interference like timing-based side-channel attacks by ensuring workloads do not contend excessively for shared resources. These features collectively support multi-tenancy by allowing multiple untrusted tenants to coexist on the same physical server without compromising each other's confidentiality or integrity. Key protection features further enhance hypervisor security, including secure boot for and hardware-based attestation. Secure boot verifies the authenticity of VM firmware, bootloaders, and operating systems at startup, blocking from loading; for instance, Microsoft Hyper-V Generation 2 VMs enforce this to prevent rootkits or tampered kernels. Attestation mechanisms, such as (TXT), enable remote verification of the platform's boot process and hypervisor state using trusted platform modules (TPMs). Encrypted memory technologies provide additional safeguards: AMD's Secure Encrypted Virtualization (SEV), introduced in 2016, assigns unique encryption keys per VM to protect memory contents from hypervisor or host access, while Intel's Trust Domain Extensions (TDX), released in 2021, extends this to full VM isolation with integrity-protected encryption. These capabilities yield significant benefits, including a reduced where breaches are contained within individual , limiting propagation to the host or other guests and acting as an effective . Patching becomes more efficient, as hypervisors support of to alternate hosts during updates, avoiding downtime for critical workloads. also aids , such as PCI-DSS requirements for segmenting cardholder data environments from other systems. Advanced features like maintain VM state encryption throughout execution, denying even privileged hypervisor access to sensitive , while role-based access controls (RBAC) enforce granular permissions for hypervisor management, restricting administrative actions to authorized roles only. Studies demonstrate that such techniques can reduce the attack surface by up to 90%, substantially curbing risks of lateral movement in multi-tenant environments.

Vulnerabilities and Mitigations

Hypervisors are susceptible to escape attacks, where malicious code within a (VM) exploits flaws to access the host system or other , potentially leading to full compromise. A prominent example is the vulnerability (CVE-2015-3456), a in the floppy disk controller that allows a privileged guest user to crash the VM or execute arbitrary code on the host, affecting hypervisors like , , and . Side-channel attacks, such as and Meltdown disclosed in 2018, further undermine VM isolation by exploiting in CPUs to leak sensitive data across boundaries, enabling guests to read hypervisor memory or data from other . Hypervisor-specific risks often involve through mishandled extensions, such as VT-x. For instance, flaws in VT-x implementation can allow guests to manipulate hypervisor state, leading to unauthorized access; recent cases include CVE-2024-37085 in , where attackers escalate privileges via bypass to gain administrative control over the hypervisor. In , denial-of-service () vulnerabilities targeting ARM guests, such as those in page refcounting (e.g., XSA-473 from 2025), enable malicious guests to crash the hypervisor by exhausting resources without proper alignment checks. Mitigations for these vulnerabilities include applying firmware and microcode updates to address side-channel issues, as seen in patches for variant CVE-2017-5715 that prevent guest-to-hypervisor data leaks in . Hypercall validation in hypervisors like and KVM ensures guest requests are sanitized to block escalation attempts, while tools such as sVirt integrate SELinux with libvirt to enforce mandatory access controls, labeling VM resources to isolate them from the host and prevent escapes in KVM environments. complements this by confining processes through profiles that restrict file and network access, mitigating risks in deployments. Best practices emphasize least privilege principles, where hypervisors run with minimal permissions and VMs are confined to necessary resources, alongside regular auditing and monitoring to detect unusual behavior. NIST Special Publication 800-125A provides guidelines for secure hypervisor deployment, recommending configuration hardening like disabling unused features and enabling integrity checks to reduce attack surfaces. Emerging threats in 2025 involve AI-driven attacks that optimize exploitation of VM scheduling for side-channel leaks, where models predict and manipulate to amplify , as noted in reports on AI-enhanced cyber operations. Supply chain compromises, akin to the 2020 incident, pose risks to virtualization through tainted updates or build pipelines, with 2024-2025 analyses showing increased targeting of open-source hypervisor components like , potentially introducing backdoors during deployment.

Modern Applications

Cloud and Data Center Deployment

In large-scale cloud and data center environments, hypervisors play a pivotal role in enabling efficient resource utilization, isolation, and orchestration of virtual machines (VMs) across thousands of physical servers. Major cloud providers leverage specialized hypervisor implementations to optimize performance and security at scale. For instance, (AWS) introduced the System in 2017, featuring a custom Type 1 hypervisor that is lightweight and firmware-like, focusing solely on memory and CPU allocation while offloading networking, storage, and functions to dedicated hardware components such as Nitro Cards and the Nitro Security Chip. This design delivers near-bare-metal performance and enhances isolation by minimizing the hypervisor's attack surface. Similarly, employs as its core hypervisor for VM deployment, supporting of on-premises VMs to Azure through tools like Azure Migrate, which facilitates seamless integration and scalability in hybrid setups. Google, on the other hand, uses gVisor, an open-source sandboxed container runtime introduced in 2018, which functions as a user-space hypervisor to isolate containers from the host , integrating with and for secure, portable workloads in Google Kubernetes Engine (GKE). Hardware offloading, exemplified by AWS SmartNICs (also known as Data Processing Units or DPUs), further reduces CPU overhead by handling virtualization tasks like networking and storage directly on the , improving efficiency in hyperscale data centers. Data centers rely on hypervisors for , achieving VM densities such as 10:1 or higher—where a single physical hosts 10 or more —thereby reducing footprint and operational costs while maximizing resource utilization. (HA) is ensured through clustering mechanisms, where hypervisors like enable clustering to automatically restart on healthy nodes during host failures, minimizing to seconds. further supports zero- operations by transparently moving running between hosts without interrupting services, a feature integral to and other type 1 hypervisors for maintenance and load balancing in clustered environments. Orchestration platforms integrate hypervisors to automate provisioning and management at scale. , for example, uses hypervisors like KVM for compute nodes, enabling dynamic VM scaling and integration with for hybrid container-VM workflows. extends to manage VMs as native resources, allowing orchestration of both VMs and containers via a unified , with support for and storage integration in production environments. This facilitates automated provisioning, such as rapid VM deployment in response to demand spikes, streamlining operations in multi-tenant data centers. Scalability in hypervisor deployments faces challenges in and . Single Root I/O Virtualization (SR-IOV) addresses network bottlenecks by allowing direct VM access to physical NICs, bypassing the hypervisor for higher throughput and lower in high-density setups, though it requires compatible and careful configuration to avoid resource contention. For storage, integrating distributed systems like Ceph with VMs enables scalable, resilient block and , but introduces challenges such as performance tuning for I/O-intensive workloads and managing cluster expansion without downtime. The market, closely tied to hypervisor deployments, is projected to grow from USD 2.4 billion in 2023 to USD 9.7 billion by 2033 at a CAGR of 15%, driven by demand for secure scaling in cloud environments. A prominent is 's dominance in centers, where its vSphere hypervisor has powered and for decades, supporting over 500,000 customers globally. However, following Broadcom's 2023 acquisition of for $61 billion, pricing changes—including a shift to subscription-only licensing, minimum 72-core purchases (up from 16), and increases of 150-1,250% for some renewals—have prompted many organizations to explore alternatives like open-source hypervisors or cloud-native shifts.

Emerging Trends and Innovations

In recent years, hypervisors have increasingly incorporated (AI) and (ML) for enhanced resource management and . For instance, AI-driven frameworks in Virtual Desktop Infrastructure (VDI) enable predictive scaling of GPU resources for intensive workloads in hybrid cloud environments, optimizing allocation based on usage patterns and reducing overhead by up to 30% in tested scenarios. Similarly, broader trends in hypervisor leverage AI for predictive autoscaling, allowing dynamic adjustment of virtual machine (VM) resources to handle fluctuating demands in data centers and edge setups, improving efficiency without manual intervention. The integration of hypervisors with technologies represents a approach to , combining the of VMs with the lightweight performance of . Containers, an open-source project initiated in 2017, runs within lightweight VMs powered by hypervisors such as /KVM or , providing stronger workload while maintaining compatibility with orchestration tools like . This contrasts with pure OS-level like , as adds a hardware-virtualized layer for enhanced security against container escapes, making it suitable for multi-tenant environments. At the edge and in (IoT) deployments, hypervisors are adapting to resource-constrained devices for . The hypervisor supports hardware, enabling on low-power ARM-based boards for edge applications, with ongoing community efforts to expand its use in industrial and scenarios as of 2025. Confidential edge computing further advances this by incorporating trusted execution environments (TEEs) into hypervisors, protecting data processing from compromised hosts or networks; for example, solutions like Metalvisor optimize secure, cloud-native workloads at the edge while minimizing size, weight, power, and cost (SWaP-C). Key innovations in hypervisor design include , which compile applications directly with minimal OS components to create specialized, efficient . Unikraft, an open-source unikernel development kit, facilitates the building of such lightweight that boot in milliseconds and consume fewer resources than traditional guests, ideal for serverless and edge use cases. GPU virtualization has also evolved, with NVIDIA's vGPU software enabling time-sharing of physical GPUs across multiple on supported hypervisors like , Citrix Hypervisor, and KVM, accelerating graphics and AI workloads in virtualized settings. Market dynamics in 2025 show a surge in open-source hypervisors as alternatives to proprietary solutions like , driven by cost concerns and licensing changes. Proxmox VE and , both based on KVM and respectively, have gained traction for their free core offerings, integrated management interfaces, and support for hybrid environments, with Proxmox particularly noted for its ease in small-to-medium deployments. In systems, hypervisors are expanding into autonomous vehicles, where the automotive hypervisor is projected to grow significantly due to needs for consolidating safety-critical and systems on shared . Solutions like the Hypervisor enable real-time partitioning for mixed-criticality applications in vehicles, enhancing reliability and compliance with standards like ISO 26262.

References

  1. [1]
    Virtualization via Virtual Machines - Software Engineering Institute
    Sep 18, 2017 · A hypervisor, also called a virtual machine monitor (VMM), is a software program that runs on an actual host hardware platform and supervises ...
  2. [2]
    Security Recommendations for Hypervisor Deployment on Servers
    Jan 23, 2018 · The Hypervisor is a collection of software modules that provides virtualization of hardware resources (such as CPU/GPU, Memory, ...
  3. [3]
    Virtualization in Cloud Computing: Everything You Need to Know
    Hypervisor: Also known as a virtual machine monitor (VMM), a hypervisor is a software layer that allows multiple VMs to run on a physical host.
  4. [4]
    [PPT] Virtualization and Cloud Computing
    A hypervisor, a.k.a. a virtual machine manager/monitor (VMM), or virtualization manager, is a program that allows multiple operating systems to share a single ...
  5. [5]
    Virtualization
    These include the first virtualization systems (IBM 1966), often used to avoid/delay porting large application systems. More modern instances: The Java Virtual ...
  6. [6]
    [PDF] Virtualization Components of the Modern Hypervisor
    XenServer are examples of this type of hypervisor. Figure 1 is a diagram of VMWare's hypervisor architecture which is an example of a type 1 hypervisor.
  7. [7]
    [PDF] Hardware and Software Support for Virtualization
    e history of virtualization is an excellent example of this cycle of innovation. ... Computing Base and increase the attack surface of the hypervisor. Switching ...
  8. [8]
    [PDF] Containers and Virtual Machines at Scale: A Comparative Study
    Both hardware and operating system virtualization have a long and storied history in computing. More recently, hypervisors such as Xen [26], VMware ESX [50] ...
  9. [9]
    What's the difference between Type 1 vs. Type 2 hypervisor?
    Mar 7, 2024 · A Type 1 hypervisor is installed directly atop a computer's hardware. No underlying operating system is needed to operate a Type 1 hypervisor.
  10. [10]
    Introduction to Virtual Machines
    Original concepts identified types. Type 1 Hypervisor (also called bare metal or native) - KVM is an example. Type 2 Hypervisor (also known as hosted ...
  11. [11]
    [PDF] CSMC 412 - UMD Computer Science
    Types of VMs – Type 1 Hypervisor (cont.) • Another variation is a general purpose OS that also provides VMM functionality. • RedHat Enterprise Linux with KVM ...<|control11|><|separator|>
  12. [12]
    hypervisor - Glossary | CSRC
    The virtualization component that manages the guest OSs on a host and controls the flow of instructions between the guest OSs and the physical hardware.
  13. [13]
    [PDF] Virtual Machine Monitors - cs.wisc.edu
    of a virtual machine monitor (VMM) (also called a hypervisor) [G74]. Specifically, the monitor sits between one or more operating systems and the hardware ...
  14. [14]
    [PDF] Lecture 8: February 22 8.1 Virtualization - LASS
    A hypervisor is the virtualization layer, which takes care of resource management, isolation and scheduling. There are 2 types of hypervisors that act like ...
  15. [15]
    [PDF] Guide to Security for Full Virtualization Technologies
    For example, hosted hypervisors are typically controlled by management software that can be used by anyone with access to the keyboard and mouse. Even bare ...Missing: origin | Show results with:origin
  16. [16]
    [PDF] A performance analysis of Xen and KVM hypervisors
    Disaster recovery efforts can be greatly simplified through the use of virtualization. In the event of a disaster, backups of the virtual machines can be ...
  17. [17]
    [PDF] Virtualization Technology Under the Hood
    Overall, hosted virtualization can provide many benefits during the development process including reducing the cost of beta testing software, running legacy ...
  18. [18]
    [PDF] High-Performance Hypervisor Architectures: Virtualization in HPC ...
    Virtualization makes it possible to isolate application workloads and their needs from the control and man- agement functionality needed to implement these ...
  19. [19]
    [PDF] Virtual Machines - cs.Princeton
    Dec 11, 2019 · History. ◇ Have been around since 1960's on mainframes. ○ Used to run apps on different OSes on same (very expensive ) mainframe. ○ Good ...
  20. [20]
    Hypervisor - an overview | ScienceDirect Topics
    Types and Architectures of Hypervisors. Hypervisors are classified into two main types: Type 1 (bare-metal) hypervisors and Type 2 (hosted) hypervisors. 7
  21. [21]
    The history of virtualization and its mark on data center management
    Oct 24, 2019 · In 1974, Gerald Popek and Robert Goldberg classified the hypervisor into two types: Type 1 and Type 2. The two types helped distinguish ...
  22. [22]
    [PDF] Formal Requirements for Virtualizable Third Generation Architectures
    We consider two cases, innocuous in- structions and sensitive instructions. Both cases are easy, and demonstrated in detail in the Appendix as lemmas 1 and 2.<|control11|><|separator|>
  23. [23]
    Understanding Virtualization Classes in Cloud Computing
    Mar 17, 2012 · A hypervisor can assume a micro-kernel architecture like Microsoft Hyper-V. It can also assume a monolithic hypervisor architecture like VMware ...
  24. [24]
    What Is a Hypervisor? - Wind River Systems
    There are two main types of hypervisors: Type 1 (or bare metal) hypervisors, which run directly on the hardware; and Type 2 (or hosted) hypervisors, which run ...
  25. [25]
    Embedded hypervisors
    Mar 22, 2016 · Hypervisors essentially come in two flavors, which are imaginatively named Type 1 and Type 2. Type 1 hypervisors run on bare metal; Type 2 ...
  26. [26]
    Lecture 25: Virtual machines
    A user-sensitive instruction is sensitive when executed in user/unprivileged mode. A safe, or innocuous, instruction is not sensitive. A virtual machine ...
  27. [27]
    Type 1 vs. Type 2 Hypervisor: What Is The Difference? - StarWind
    Jul 20, 2023 · Detailed comparison of Hypervisor Type 1 vs. Type 2: definitions, main differences, advantages and disadvantages of each, and conclusion of ...
  28. [28]
    Is virtual machine slower than the underlying physical machine?
    Apr 24, 2010 · The typical experience for a general purpose server workload on a bare metal\Type 1 Hypervisor is around 1-5% of CPU overhead and 5-10% Memory overhead.
  29. [29]
    [PDF] Introduction to the New Mainframe: z/VM Basics - IBM Redbooks
    Nov 19, 2007 · At the end of 1964, work began on a project to develop a new kind of operating system, Control Program-40 (CP-40). It was a system that ...
  30. [30]
    What Is Virtualization? | IBM
    The emergence of virtualization technology dates back to 1964 when IBM launched CP-40, a time-sharing research project for the IBM System/360. CP-40 later ...
  31. [31]
    Virtual storage and virtual machine concepts | IBM Systems Journal
    To better illustrate the material, the virtual machine system CP-67 for the IBM System/360 Model 67 is considered at some length. An annotated bibliography ...
  32. [32]
    Revisiting the History of Virtual Machines and Containers
    In the mid-1960s, IBM's Control Program-40 Cambridge Monitor System (CP-40/CMS) project running on a modified IBM System/360 (model 40) took the idea a few ...<|control11|><|separator|>
  33. [33]
    [PDF] The Origin of the VM/370 Time-sharing System - cs.wisc.edu
    At about the same time, CP-67 was built to use the address translation feature of the newly announced Systed360 Model 67. CP-67 and CMS were installed on ...
  34. [34]
    Bringing Virtualization to the x86 Architecture with the Original ...
    Aug 5, 2025 · VMware faced a challenge in virtualizing the x86 architectures of the time, because the hardware did not support traditional virtualization ...
  35. [35]
    [PDF] Bringing Virtualization to the x86 Architecture with the Original ...
    We started VMware in 1998 with the goal of bringing virtualization to the x86 architecture and the personal computer industry. VMware's first product—VMware.
  36. [36]
    An overview of hardware support for virtualization | TechTarget
    Jun 23, 2022 · In 2005, Intel first introduced hardware support for virtualization with Intel VT-x on two models of the Pentium 4 processor. VT-x added 10 ...
  37. [37]
    From hardware virtualization to Hyper-V's Virtual Trust Levels
    Jul 29, 2021 · Hardware virtualization was introduced in 2005 by Intel as Intel VT-x, and AMD followed suit with the release of SVM (later named AMD-V) in 2006 ...
  38. [38]
    [PDF] Xen and the Art of Virtualization
    Virtualizing memory is undoubtedly the most difficult part of paravirtualizing an architecture, both in terms of the mechanisms required in the hypervisor and ...
  39. [39]
    ESX Server 1.0 - Trip down memory lane - WilliamLam.com
    Apr 4, 2023 · ... ESX and ESXi releases over the past 22 years including ESX Server 1.0 which was released by VMware back in 2001! To my surprise, finding a ...
  40. [40]
    Hyper-V Struts Its Stuff | ServerWatch
    Sep 1, 2020 · Indeed, Microsoft's been a player in the virtualization space since February 2004, when it released its first beta of Virtual Server 2004 in ...
  41. [41]
    [PDF] kvm: the Linux Virtual Machine Monitor
    Jun 30, 2007 · Using kvm, one can create and run multiple virtual machines. These virtual ma- chines appear as normal Linux processes and integrate seamlessly ...
  42. [42]
    [PDF] A Comparison of Software and Hardware Techniques for x86 ...
    The transition from software-only VMMs to hardware-assisted. VMMs provides an opportunity to examine the strengths and weak- nesses of both techniques. The main ...
  43. [43]
    [PDF] Hardware Support for Efficient Virtualization - UCSD CSE
    Virtualization on the x86 architecture has required unnec- essary complexity due to its inherent lack of support for virtual machines. However, extensions to ...
  44. [44]
    Xen Project Announces Performance and Security Advancements ...
    Aug 5, 2024 · This release marks a significant milestone in enhancing performance, security, and versatility across various architectures, including Arm, PPC, RISC-V, and x ...
  45. [45]
    Breaking Down the Impacts of Broadcom's VMware Acquisition
    The acquisition changed VMware's route to market, impacting financial, architectural, operational, business, and people aspects, including limited support for ...
  46. [46]
    Bringing Virtualization to the x86 Architecture with the Original ...
    Nov 1, 2012 · This article describes the historical context, technical challenges, and main implementation techniques used by VMware Workstation to bring virtualization to ...
  47. [47]
    [PDF] Performance Evaluation of Intel EPT Hardware Assist - VMware
    Recently Intel introduced its second generation of hardware support that incorporates MMU virtualization, called Extended Page Tables (EPT). We evaluated EPT ...
  48. [48]
    VMware vSphere | Virtualization Platform
    Modernize your organization's compute infrastructure with security and compliance, all with VMware vSphere.vSphere Resources · vSphere Foundation · vSphere 8 Update 3 · Lab Details
  49. [49]
    Hyper-V virtualization in Windows Server and Windows
    Aug 5, 2025 · Learn about Hyper-V virtualization technology to run virtual machines, its key features, benefits, and how to get started in Windows Server ...Missing: 2004 2008<|separator|>
  50. [50]
    https://www.vmware.com/products/cloud-infrastructure/vsphere
  51. [51]
    Chapter 1. First Steps - Oracle VirtualBox
    Oracle VM VirtualBox is a so-called hosted hypervisor, sometimes referred to as a type 2 hypervisor. Whereas a bare-metal or type 1 hypervisor runs directly ...
  52. [52]
    Migrating Virtual Machines with vSphere vMotion - TechDocs
    vSphere vMotion moves a VM to another host, allowing it to continue working. It can change compute resource and storage, and the migration is transparent.
  53. [53]
    What is a Hypervisor? - VMware
    A hypervisor, also known as a virtual machine monitor or VMM, is software that creates and runs virtual machines (VMs).
  54. [54]
    Green Hills Software Products
    INTEGRITY Multivisor® Embedded hypervisor to safely and securely host guest OS ; µ-visor ® Hypervisor Virtualization for safety & critical microcontroller-based ...
  55. [55]
    [PDF] VOSYSmonitor, a TrustZone-based Hypervisor for ISO 26262 Mixed ...
    Embeddedxen: A revisited architecture of the xen hypervisor to support arm-based embedded virtualization. Whitepaper,. June 2012. [15] Daniel Sangorrin ...
  56. [56]
    VOSYSmonitor, a TrustZone-based Hypervisor for ISO 26262 Mixed ...
    Embeddedxen: A revisited architecture of the xen hypervisor to support arm-based embedded virtualization. Whitepaper, June 2012. Google Scholar. [15]. Daniel ...<|separator|>
  57. [57]
    [PDF] vTZ: Virtualizing ARM TrustZone - TrustKernel
    vTZ virtualizes TrustZone, providing each VM a virtualized TEE using existing hardware, while maintaining strong isolation among guest TEEs.
  58. [58]
    Switching Gears: Moving Systems to VxWorks from QNX | Wind River
    Jul 3, 2024 · Our webinar “Seamless RTOS Transition: Migrating to VxWorks” explores the case for migration, its key technical considerations, and the world beyond migration.
  59. [59]
    (PDF) The OKL4 Microvisor: Convergence Point of Microkernels and ...
    OKL4 is a popular Type I hypervisor developed by Open Kernel Labs (the company was acquired by General Dynamic Mission Systems in 2012, and the hypervisor is no ...
  60. [60]
    [PDF] XtratuM: a Hypervisor for Safety Critical Embedded Systems - LWN
    XtratuM provides ARINC 653 scheduling policy, partition management, inter-partition communi- cations, health monitoring, logbooks, traces, and other ...
  61. [61]
    Embedded Hypervisor Market Size & Forecast [2033]
    Sep 29, 2025 · Type 1 hypervisors accounted for 59% of total deployments due to their efficiency in direct hardware interactions. Type 2 hypervisors were ...
  62. [62]
    Trusted virtual domains on OKL4 - ACM Digital Library
    In this paper we present the design and implementation of the Trusted Virtual Domain (TVD) security architecture for smartphones. The TVD concept separates data ...
  63. [63]
    [PDF] Virtualization Techniques for Mobile Devices | Ankur Agarwal
    The OKL4 Microvisor is a type 1 hypervisor that can be either built into the device at the OEM level or applied after the fact via OK Lab's Virtualization Over ...
  64. [64]
    Embedded Hypervisor Market Size ($13.6 Billion) 2030
    Embedded hypervisor market valued at $6.8 Bn in 2024, projected to reach $13.6 Bn by 2030 at 10.3% CAGR, says Strategic Market Research.
  65. [65]
    [PDF] Latency Analysis of I/O Virtualization Techniques in Hypervisor ...
    Abstract—Nowadays, hypervisors are the standard solution to integrate different domains into a shared hardware platform, while providing safety, security, ...
  66. [66]
    [PDF] Challenges in real-time virtualization and predictable cloud computing
    The open-source Xen [9] hypervisor brought in the concept of para-virtualization, a technique allowing for replacing the trap- based emulation of privileged ...
  67. [67]
    [PDF] ITL Bulletin Full Virtualization Technologies
    A technique known as paravirtualization provides a method for the hypervisor to make available interfaces that the guest OS can use instead of the normal ...
  68. [68]
    Supported Virtualization Modes (System Administration Guide
    The hypervisor supports both modes. Full virtualization allows any x86 operating system, including Solaris, Linux, or Windows systems, to run in a guest domain.
  69. [69]
    Difference between Xen PV, Xen KVM and HVM? - Server Fault
    Jan 13, 2011 · Fully virtualized guests don't require special kernel, so for example Windows operating systems can be used as Xen HVM guest. Fully ...Missing: Hyper- | Show results with:Hyper-
  70. [70]
    Supported Windows guest operating systems for Hyper-V on ...
    Hyper-V supports several versions of Windows Server, Windows, and Linux distributions to run in virtual machines, as guest operating systems.Windows Server 2025 · Windows Server 2022 · Windows 11
  71. [71]
    Supported Linux and FreeBSD virtual machines for Hyper-V on ...
    Jun 19, 2025 · Hyper-V supports both emulated and Hyper-V-specific devices for Linux and FreeBSD virtual machines. When running with emulated devices, no additional software ...Supported Ubuntu virtual... · CentOS and Red Hat... · Supported Debian virtual...Missing: VMware | Show results with:VMware
  72. [72]
    IBM operating systems supported as guests of z/VM
    In general, an operating system is supported as a guest of z/VM only where support has been announced for that operating system to run on the server.
  73. [73]
    Arm System emulator — QEMU documentation
    QEMU can emulate both 32-bit and 64-bit Arm CPUs. Use the qemu-system-aarch64 executable to simulate a 64-bit Arm machine.A-profile CPU architecture... · Arm Versatile boards... · VMApple machine emulationMissing: cross- overhead
  74. [74]
    Supported Guest Operating Systems - TechDocs - Broadcom Inc.
    Dec 13, 2024 · VMware HCX supports various Linux (e.g., CentOS, RHEL, Ubuntu) and Windows (e.g., Windows Server 2019, 2016, 2012) guest OS versions on KVM or  ...
  75. [75]
    Virtualization limits and support | Virtualization Guide | SLES 15 SP7
    This section lists the support status for guest operating systems virtualized on top of SUSE Linux Enterprise Server 15 SP7 for KVM and Xen hypervisors.
  76. [76]
    VMWare and Full Virtualization using Binary Translation - Saferwall
    Dec 14, 2018 · x86 support two protections mechanisms: paging and segmentation . It is possible to use either of them or both, VMWare used segmentation to ...
  77. [77]
    Hyper-V Integration Services | Microsoft Learn
    Oct 28, 2025 · Integration services, often called integration components, are services that allow the virtual machine to communicate with the Hyper-V host.Quick Reference · Hyper-V Heartbeat Service · Hyper-V Data Exchange...
  78. [78]
    libvirt releases
    It enables/disables the ability of the QEMU virtio memory balloon to return unused pages back to the hypervisor. QEMU 5.1 and newer support this feature ...
  79. [79]
    Boosting Cross-Architectural Emulation Performance by Foregoing ...
    Jan 6, 2025 · QEMU allows a user to either emulate an entire system or run processes from binaries compiled for any of approximately 30 CPU architectures.
  80. [80]
    Understanding the Two Virtual Machine Licenses with Windows ...
    Mar 8, 2024 · When you use a different hypervisor, then that second bullet simply does not apply to you. Your “licensed server” can run two virtual machines ...
  81. [81]
    Common Oracle Licensing Compliance Issues in Virtual Environments
    Nov 14, 2024 · Common mistakes include misinterpreting hard vs. soft partition rules, underestimating license needs for VM mobility (vMotion/Live Migration), ...
  82. [82]
    [PDF] VMWARE PRODUCT GUIDE
    Apr 2, 2024 · VMware offers products in Cloud Foundation, Data Center, Security, Suites, and Desktop/End User Computing categories.<|separator|>
  83. [83]
    8.2. On Hyper-V | Red Hat Enterprise Linux | 6
    These built-in drivers are certified by Red Hat for this use, and certified configurations can be viewed on the Red Hat Customer Portal. Therefore, it is not ...
  84. [84]
    KVM vs. VMware - Red Hat
    Dec 3, 2024 · KVM, integrated into the Linux kernel, benefits from the kernel's inherent scalability and supports a wide range of hardware architectures.
  85. [85]
    [PDF] SAP Solution Guide - VMware
    These hypervisors must have a kernel that understands how to manage all of the host systems hardware directly, including scheduling time on CPUs, managing page ...
  86. [86]
    [PDF] vmware-vcenter-server-use-cases-architectures.pdf
    The trusted multitenancy model through VMware vCenter Server® directly addresses this issue through the pre-integrated single pane of management offered to ...
  87. [87]
    FAQ's about Windows Subsystem for Linux - WSL - Microsoft Learn
    Some 3rd party applications cannot work when Hyper-V is in use, which means they will not be able to run when WSL 2 is enabled, such as VMware and VirtualBox.
  88. [88]
    Chapter 9. nova | Configuration Reference - Red Hat Documentation
    The libvirt virt driver also uses it when we use config_drive to configure network to control whether network information is injected into a VM.
  89. [89]
    Chapter 7. Overcommitting with KVM - Red Hat Documentation
    The KVM hypervisor automatically overcommits CPUs and memory. This means that more virtualized CPUs and memory can be allocated to virtual machines.Missing: mechanisms | Show results with:mechanisms
  90. [90]
    [PDF] Virtualization Administration Guide - Red Hat Documentation
    Jun 24, 2022 · OVERCOMMITTING WITH KVM. The KVM hypervisor automatically overcommits CPUs and memory. This means that more virtualized. CPUs and memory can ...
  91. [91]
    What is Nested Virtualization for Hyper-V? - Microsoft Learn
    Jul 25, 2025 · Nested virtualization in Hyper-V lets you run Hyper-V inside a VM. Learn how it works, supported scenarios, and when to use it in your ...Missing: OS | Show results with:OS
  92. [92]
    9.6 Release Notes | Red Hat Enterprise Linux | 9
    The Release Notes provide high-level coverage of the improvements and additions that have been implemented in Red Hat Enterprise Linux 9.6
  93. [93]
    [PDF] Scheduler-based Defenses against Cross-VM Side-channels
    Aug 20, 2014 · However, hard isolation reduces efficiency and raises costs because of stranded resources that are allocated to a virtual machine yet left ...
  94. [94]
    Hyper-V Generation 2 Virtual Machine Security Features
    Jul 1, 2025 · Secure Boot is a feature available with generation 2 VMs that helps prevent unauthorized firmware, operating systems, or Unified Extensible ...
  95. [95]
    [PDF] Intel® Trusted Execution Technology (Intel® TXT) Enabling Guide
    Mar 1, 2014 · An Intel TXT-enabled hypervisor has the capability to insert or extend the contents of the tag into one of the PCRs in the TPM. Attestation or ...
  96. [96]
    [PDF] Common Terminology for Confidential Computing
    Confidential computing protects data in use by performing computation in a hardware-based, attested Trusted Execution Environment. Key terms include  ...
  97. [97]
    [PDF] Zero Trust Architecture in Cloud Computing - IJFMR
    ○ Network virtualization: Virtualization can reduce the attack surface by up to 90% by isolating ... ZTA significantly reduces the risk of breaches and ...
  98. [98]
    https://www.intel.com/content/dam/www/public/us/en/documents/guides/txt-enabling-guide.pdf
  99. [99]
    Venom Hypervisor Vulnerability - Qualys Blog
    Nov 3, 2022 · Crowdstrike published details today about a critical vulnerability that they discovered in a number of virtualization hypervisors: KVM, QEMU ...
  100. [100]
    Meltdown and Spectre
    Meltdown breaks the most fundamental isolation between user applications ... Spectre. Spectre breaks the isolation between different applications. It ...Meltdown · Spectre · Questions & Answers
  101. [101]
    QEMU and the Spectre and Meltdown attacks
    Jan 4, 2018 · Among the three vulnerabilities, CVE-2017-5715 is notable because it allows guests to read potentially sensitive data from hypervisor memory.
  102. [102]
    Chapter 4. sVirt | Virtualization Security Guide | Red Hat Enterprise ...
    Integrating SELinux into virtualization technologies helps improve hypervisor security against malicious virtual machines trying to gain access to the host ...
  103. [103]
    Hardening the virtualization layers — Security Guide documentation
    Sep 13, 2025 · When a KVM-based compute image is powered on, sVirt appends a random numerical identifier to the image. sVirt is capable of assigning numeric ...Hardening The Virtualization... · Physical Hardware (pci... · Svirt: Selinux And...
  104. [104]
    Security Recommendations for Hypervisor Deployment on Servers
    The security recommendations in this document relate to ensuring the secure execution of baseline functions of the hypervisor and are therefore agnostic to the ...<|separator|>
  105. [105]
    Trend Micro State of AI Security Report 1H 2025
    Jul 29, 2025 · We will examine the evolving threat landscape introduced by next generation agentic AI applications, as well as how criminals themselves are ...
  106. [106]
    [PDF] The 2025 Software Supply Chain Security Report
    Mar 14, 2025 · Software supply chain attacks got more sophisticated in 2024 as malicious actors launched attacks on the build pipelines of prominent open ...
  107. [107]
    AWS Nitro System
    The Nitro Hypervisor is a lightweight hypervisor that manages memory and CPU allocation and delivers performance that is indistinguishable from bare metal.
  108. [108]
    The components of the Nitro System - AWS Documentation
    The Nitro System consists of three primary components: Purpose-build Nitro Cards, the Nitro Security Chip, and the Nitro Hypervisor.
  109. [109]
    The Security Design of the AWS Nitro System
    A deliberately minimized and firmware-like hypervisor designed to provide strong resource isolation, and performance ...
  110. [110]
    https://csrc.nist.gov/pubs/sp/800/125/a/final
  111. [111]
    gVisor: The Container Security Platform
    gVisor is an open-source Linux-compatible sandbox that runs anywhere existing container tooling does. It enables cloud-native container security and portability ...gVisor Docs · Who's Using gVisor · Documentation · Blog
  112. [112]
    Open-sourcing gVisor, a sandboxed container runtime - Google Cloud
    May 2, 2018 · gVisor integrates with Docker and Kubernetes, making it simple and easy to run sandboxed containers in production environments. Traditional ...
  113. [113]
    Bare metal performance with the AWS Nitro System | AWS HPC Blog
    Aug 5, 2021 · The Nitro hypervisor is lightweight hypervisor that manages memory and CPU allocation. With this design, the host system no longer has direct ...<|separator|>
  114. [114]
    AWS' secret weapon is revolutionizing computing - SiliconANGLE
    Jun 18, 2021 · AWS has moved the hypervisor, network and storage virtualization to dedicated hardware that frees up the CPU to run more efficiently. The ...
  115. [115]
    What Is Server Virtualization? Your Essential Guide For 2025
    May 14, 2025 · A typical consolidation ratio ranges from 10:1 to 20:1, meaning one physical server now hosts 10-20 virtual machines. This not only reduces ...
  116. [116]
    How Hyper-V High Availability Works - NAKIVO
    Dec 4, 2023 · Learn how to enable Hyper-V High Availability for virtual machines in a Microsoft Hyper-V cluster to improve operational continuity.
  117. [117]
    Live Migration Overview | Microsoft Learn
    Sep 17, 2020 · Live migration is a Hyper-V feature in Windows Server. It allows you to transparently move running Virtual Machines from one Hyper-V host to another without ...
  118. [118]
    Run Your Kubernetes cluster on OpenStack in production - Superuser
    Mar 16, 2021 · Kubernetes and OpenStack are deeply integrated. This integration is the result of years of development within two platforms, where compute ...
  119. [119]
    What is KubeVirt? - Red Hat
    Oct 25, 2024 · KubeVirt is an open source project that makes it possible to run, deploy, and manage virtual machines (VMs) with Kubernetes as the underlying orchestration ...
  120. [120]
    Why SR-IOV is the Solution to Help Efficiently Scale Your Data Center
    Mar 31, 2023 · This model features a natural bottleneck in the hypervisor and cannot scale with the performance demands of modern workloads. Direct hardware ...
  121. [121]
    Addressing Concerns: How to Solve 6 Common Ceph Storage Issues
    Feb 26, 2025 · Five common Ceph storage concerns, from performance and scalability to hardware requirements, and share expert insights for maximum ...
  122. [122]
    Virtualization Security Market Size, Share | CAGR of 15.00%
    The Global Virtualization Security Market is expected to be worth around USD 9.7 Billion By 2033, up from USD 2.4 billion in 2023, growing at a CAGR of 15.00%.Missing: 2029 B
  123. [123]
    VMware End Of Availability of Perpetual Licensing and SaaS Services
    Jan 22, 2024 · VMware reached a new milestone in its journey over the last two years to streamline and simplify its portfolio and transition from perpetual licensing to a ...
  124. [124]
    Broadcom VMware Ups Minimum Core Purchase 'Substantially ...
    Mar 28, 2025 · Beginning April 10, the fewest licenses a VMware customer can buy will be 72 cores, up from 16 cores. Meanwhile, late renewals will now cost customers an extra ...
  125. [125]
    VMware licensing changes and the road ahead - DXC Technology
    Jan 7, 2025 · Since Broadcom's acquisition of VMware, some clients are seeing a cost increase ranging from 150% to 1,250% for the same services.Considering Alternative... · Embracing A Hybrid Cloud... · Exploring Multiple Pathways...
  126. [126]
    (PDF) AI-Optimized VMware Horizon VDI: Predictive Resource ...
    Aug 9, 2025 · This paper proposes an AI-driven framework for predictive GPU resource scaling in VMware Horizon Virtual Desktop Infrastructure (VDI) to ...Missing: Magna | Show results with:Magna
  127. [127]
    Top 5 Hypervisor Trends for 2025 - Serverion
    Jun 8, 2025 · Explore the top hypervisor trends shaping virtualization in 2025, including AI automation, cloud-native support, and enhanced security ...2. Better Cloud‐native... · 3. Multi-Vendor Flexibility... · Trend Comparison TableMissing: scheduling | Show results with:scheduling
  128. [128]
    Kata Containers - Open Source Container Runtime Software | Kata ...
    Kata Containers is an open source community working to build a secure container runtime with lightweight virtual machines that feel and perform like containers.Learn · Docs · Software · UsersMissing: onwards | Show results with:onwards
  129. [129]
    Enhancing Kubernetes workload isolation and security using Kata ...
    May 16, 2024 · Kata Containers allows you to run containers integrating with industry standard tools such as OCI container format and Kubernetes CRI interface.Missing: 2017 onwards
  130. [130]
    Xen on Raspberry Pi 4 adventures - Linux.com
    Sep 29, 2020 · We will show you how to run Xen on RPi4, the real Xen hacker way, and as part of a downstream distribution for a much easier end-user experience.
  131. [131]
    Welcome Mainsail Industries as a New Confidential Computing ...
    Secure Edge Computing: Metalvisor brings cloud-native capabilities to the edge, optimizing size, weight, power, and cost (SWaP-C) for ...
  132. [132]
    Introducing Unikraft - Lightweight Virtualization Using Unikernels
    Apr 8, 2024 · Unikraft is a fast, secure and open-source Unikernel Development Kit which enables you to easily build minimal, ultra-lightweight virtual machines.
  133. [133]
    NVIDIA Virtual GPU (vGPU) Software
    NVIDIA virtual GPU (vGPU) software is a graphics virtualization platform that extends the power of NVIDIA GPU technology to virtual desktops and apps, ...5.4 · NVIDIA vGPU 16 · 6.4 · 7.5
  134. [134]
    Best VMware Alternatives in 2025: Open Source and Enterprise ...
    Jun 24, 2025 · Microsoft provides Integration Services (similar to VMware Tools) for Linux guests to improve performance and manageability. Hyper-V has ...Open Source Vmware... · Proxmox Ve (virtual... · Kvm / Qemu (standalone Or...
  135. [135]
    Automotive Hypervisor Global Market Report 2025
    Automotive hypervisors are software platforms tailored for the automotive industry, facilitating the virtualization of hardware resources within vehicles.
  136. [136]
    Virtualization for Automotive - QNX
    Type 1 Hypervisors run directly on top of the hardware. Examples include the QNX Hypervisor. · Type 2 Hypervisors sit on top of a host operating system. They are ...