Thursday, June 21 • 10:10 - 10:40
The Art of Virtualizing Cache Maintenance - Julien Grall, Arm

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The Arm architecture allows for a wide variety of cache configurations, levels and features. This enables building systems that will optimally fit power/area budgets set for the target application.

A consequence of this is that architecturally compliant software has to cater for a much wider range of behaviors than on other architectures. While most software uses cache instructions that don't need special treatment in a virtualized environment, some will want to directly manage a given cache using set/way instructions and will introduce challenges for the hypervisor to handle them.

This talk will give an overview of how caches behave in the Arm architecture, especially in the context of virtualization. It will then describe the problem of using set/way instructions in a virtualized environment. We will also discuss the modifications required in Xen to handle those instructions.

avatar for Julien Grall

Julien Grall

Senior Software Engineer, Arm ltd
Julien Grall is a Senior Software Engineer at Arm, working on open source virtualization. He has been working on Xen since 2012, initially focusing on Xen x86 and then on support for Arm architecture. He is currently a maintainer of Xen Arm.

Thursday June 21, 2018 10:10 - 10:40
Jiangning, Level 2

Attendees (7)