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Tuesday, July 11 • 16:35 - 17:35
Design Session: Improved Xen/domU ring mapping API - Andrew Cooper, Citrix

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The current mechanisms for Qemu and other emulators to form shared rings with Xen is problematic. As a start, it is an entirely unnecessary security risk (being guest-accessible), but it also may cause performance problems (by shattering host superpages), migration problems (emulators can't attach to an incoming domain until migration is complete). Furthermore, the duct-tape applied to newer emulator interfaces (remove the mapping from the p2m) prevents re-attaching to running domain which has ballooned to its limit (as re-attaching involves adding one extra frame).


Andrew Cooper

Senior Software Engineer, Citrix XenServer
Andrew is a senior software engineer working in the Ring0 team for Citrix XenServer. Upstream, he is x86 hypervisor maintainer, committer, and a member of the Xen security team.

Tuesday July 11, 2017 16:35 - 17:35
Valletta Conference Centre II

Attendees (10)