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Live patching is gaining the momentum - see Ksplice, Kpatch, kGraft, XEN and similar

This is not live patching.

A 0patch employee stopped by to explain that they live patch user mode only at this point on Windows, kernel mode is a future goal.

Except with microsoft where they have stopped using their live patching code and just force reboots on the user.

Indeed - hotpatching support was removed in Windows 8. Apparently it was only ever used in a few updates, and some unscrupulous folks took advantage of the capability: https://arstechnica.com/security/2016/04/hacking-group-plati...