English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This paper outlines the design of `Quest-V', which is implemented as acollection of separate kernels operating together as a distributed system on achip. Quest-V uses virtualization techniques to isolate kernels and preventlocal faults from affecting remote kernels. This leads to a high-confidencemultikernel approach, where failures of system subcomponents do not render theentire system inoperable. A virtual machine monitor for each kernel keeps trackof shadow page table mappings that control immutable memory accesscapabilities. This ensures a level of security and fault tolerance insituations where a service in one kernel fails, or is corrupted by a maliciousattack. Communication is supported between kernels using shared memory regionsfor message passing. Similarly, device driver data structures are shareablebetween kernels to avoid the need for complex I/O virtualization, orcommunication with a dedicated kernel responsible for I/O. In Quest-V, deviceinterrupts are delivered directly to a kernel, rather than via a monitor thatdetermines the destination. Apart from bootstrapping each kernel, handlingfaults and managing shadow page tables, the monitors are not needed. Thisdiffers from conventional virtual machine systems in which a central monitor,or hypervisor, is responsible for scheduling and management of host resourcesamongst a set of guest kernels. In this paper we show how Quest-V can implementnovel fault isolation and recovery techniques that are not possible withconventional systems. We also show how the costs of using virtualization forisolation of system services does not add undue overheads to the overall systemperformance.

Quest-V: A Virtualized Multikernel for High-Confidence Systems