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[libvirt] memory-ballooning side-channel attack

Hello and Happy Holidays,

In the past few years many serious attacks against the memory deduplication (KSM) feature of all hypervisors have been shown. [1] Even allowing attackers to modify/steal APT keys and source lists on the host. [2] Since its not enabled by default the fall out is relatively low and easily mitigated.

New side-channel attacks against memory-ballon enabled VMs are beginning to surface. Please consider documenting this and disabling this feature for newly created VMs to have safe defaults.

[1] https://staff.aist.go.jp/c.artho/papers/EuroSec2011-suzaki.pdf
[2] https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_razavi.pdf
[3] http://ieeexplore.ieee.org/document/7562068/

*Hint: If you can't see the IEEE paper use sci-hub.

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