Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"Hypervisor"”.
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Modeling virtualized application performance from hypervisor counters
… service levels are generally inaccessible to the hypervisor. To aid in VM consolidation and service level assurance, we develop a modeling technique that generates accurate models of service level. Using only hypervisor counters as inputs, we train models to predict application response times and …
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Lightweight and purpose built hypervisor for malware analysis
… features commonly found in general purpose hypervisors, including virtual device emulation. We take advantage of hardware virtualization support to make MAVMM more simple, secure and transparent. In this thesis, we describe the design and implementation of MAVMM, and the features that we can …
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Towards an agile hypervisor for software-defined networks
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-05-01
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Providing application-aware reliability through OS/hypervisor-level techniques
Operating systems and hypervisors enable the collection and extraction of rich information on application and system execution characteristics. This thesis describes a Reliability MicroKernel (RMK) architecture, which provides an infrastructure that enables the design and deployment of software …
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Hypervisor introspection: a technique for evading passive virtual machine monitoring
… isolation of virtualized environments from the hypervisor. We show that there are still some events that can be observed that break this isolation. External observers can discern when virtual machines are suspended due to hypervisor activity, and can use this information to mount advanced …
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CPU Transparent Protection of OS Kernel and Hypervisor Integrity with Programmable DRAM
… all the outer rings including both OS kernel and hypervisor of interest, with a greater extendibility enabled by a programmable interface. It offers a hardware drop-in solution transparent to the host CPU and memory controller. Moreover, MGuard is isolated from the host software and hardware, …
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CheriOS: Designing an untrusted single-address-space capability operating system utilising capability hardware and a minimal hypervisor
This thesis presents the design, implementation, and evaluation of a novel capability operating system: CheriOS. The guiding motivation behind CheriOS is to provide strong security guarantees to programmers, even allowing them to continue to program in fast, but typically unsafe, languages such as …
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Dynamic reliability and security monitoring: a virtual machine approach
… monitoring takes advantage of this and uses the hypervisor that runs VMs for robust reliability and security monitoring. The hypervisor provides an environment that is isolated from failures and attacks inside customers’ VMs. Furthermore, as a low-level manager of computing resources, the …
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Using VProbes for intrusion detection
… do so by running the OS inside a modified hypervisor. This risks of adding new bugs that reduce the correctness or security of the hypervisor, and may make it harder to incorporate upstream improvements. VMware has a technology called VProbes that allows setting breakpoints, examining …
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CloudVal: a framework for failure validation of virtualization environment in cloud infrastructure
… case study, based on injecting faults in the KVM hypervisor and XEN hypervisor, was conducted to show the viability of the framework. The study shows that due to the architectural differences between KVM and XEN, a direct comparison of the two virtualization systems is not feasible. In order to …
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Tracking working set sizes of virtual machines using miss ratio curves
… are often used within the memory scheduler of a hypervisor to estimate the memory demands of VMs running on the hypervisor. In order to manage the memory resources of the hypervisor efficiently, it is essential that these working set sizes be estimated accurately at any given point in time. …
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WiMAX spectrum virtualization and network federation
… a novel entity known as the Virtual Spectrum Hypervisor (VS-Hypervisor). This VS-Hypervisor bears the responsibility of spectrum management and virtualization within the WiMAX framework. In the implementation of WiMAX network federation, the novel architecture enables the cooperative existence …
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On Improving the Security of Virtualized Systems through Unikernelized Driver Domain and Virtual Machine Monitor Compartmentalization and Specialization
… infrastructures. Its core subsystems include hypervisors and virtual machine monitors (VMMs). They ensure the isolation and security of co-existent virtual machines (VMs) running on the same physical machine. Traditionally, driver domains -- isolated VMs in a hypervisor such as Xen that run …
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Architecting Trust: Building Secure and High-Performance Confidential VMs
… hides the virtual CPU register state from the hypervisor during context switches. To allow the hypervisor to properly handle interrupts and emulate instructions, we summarize a specification listing which registers need to be exposed in specific scenarios. In the second part of this thesis, we …
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Can silhouette execution mitigate VM boot storms?
… aim of this thesis is to investigate whether a hypervisor could theoretically exploit the overlap in the instruction streams of concurrently booting VMs to reduce CPU pressure in boot storms. This idea, which we name silhouette execution, would allow hypervisors to use the CPU in a scalable way, …
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Analysis of Performance and Power Aspects of Hypervisors in Soft Real-Time Embedded Systems
… necessitated solutions to secure these systems. Hypervisors are a solution, but the overhead imposed by them needs to be quantitatively understood. Experiments were conducted to quantify the overhead hypervisors impose on soft real-time embedded systems. A soft real-time computer vision algorithm …
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Continuous monitoring methods to achieve resiliency for virtual machines
… oc- curring inside a VM. For monitoring the hypervisor, we introduce hShield, a Control-Flow Integrity (CFI) enforcement method to detect VM-escape at- tacks. HyperTap, Hprobes, and hShield create a complete chain-of-trust for the entire virtualization software stack.
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Scaling synchronization primitives
… issues due to a semantic gap between the hypervisor scheduler and a virtual machine scheduler—the double scheduling problem. We address this problem by bridging this gap, in which both the hypervisor and virtual machines share minimal scheduling information to avoid the preemption …
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Optimizing Boot Times and Enhancing Binary Compatibility for Unikernels
… such obstacles as unscalable boot procedures in hypervisors and the difficulty in porting native applications to unikernel models. This work presents a solution for the first based on the popular Xen hypervisor, and demonstrates a significant performance benefit when running a large number of …
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