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Second Level Address Translation (SLAT), also known as nested paging, is a hardware-assisted virtualization technology which makes it possible to avoid the overhead associated with software-managed shadow page tables.
Secure Nested Paging (SEV-SNP): Reverse-Map Table (RMP) instructions PSMASH: F3 0F 01 FF: Page Smash: expands a 2MB-page RMP entry into a corresponding set of contiguous 4KB-page RMP entries. The 2 MB page's system physical address is specified in the RAX register. VMM Zen 3: RMPUPDATE: F2 0F 01 FE: Write a new RMP entry.
Users of VirtualBox can load multiple guest OSes under a single host operating-system (host OS). Each guest can be started, paused and stopped independently within its own virtual machine (VM). The user can independently configure each VM and run it under a choice of software-based virtualization or hardware assisted virtualization if the ...
Nested page tables can be implemented to increase the performance of hardware virtualization. By providing hardware support for page-table virtualization , the need to emulate is greatly reduced. For x86 virtualization the current choices are Intel 's Extended Page Table feature and AMD 's Rapid Virtualization Indexing feature.
In computer science, thrashing occurs in a system with virtual memory when a computer's real storage resources are overcommitted, leading to a constant state of paging and page faults, slowing most application-level processing. [1] This causes the performance of the computer to degrade or even collapse. The situation can continue indefinitely ...
The MMU detects the page fault, but the operating system's kernel handles the exception by making the required page accessible in the physical memory or denying an illegal memory access. Valid page faults are common and necessary to increase the amount of memory available to programs in any operating system that uses virtual memory , such as ...
x86 virtualization is the use of hardware-assisted virtualization capabilities on an x86/x86-64 CPU.. In the late 1990s x86 virtualization was achieved by complex software techniques, necessary to compensate for the processor's lack of hardware-assisted virtualization capabilities while attaining reasonable performance.
The (h,k)-paging problem is a generalization of the model of paging problem: Let h,k be positive integers such that . We measure the performance of an algorithm with cache of size h ≤ k {\displaystyle h\leq k} relative to the theoretically optimal page replacement algorithm .