Gavin Guo had provided a patch to fix this issue, it's a SRU candidate:
https://lists.ubuntu.com/archives/kernel-team/2018-November/096844.html
I'll update this issue accordingly, thanks Gavin!
Cheers,
Guilherme
** Changed in: linux (Ubuntu)
Importance: Medium => High
** Changed in: linux (Ubuntu Xenial)
Importance: Medium => High
** Changed in: linux (Ubuntu)
Status: Triaged => In Progress
** Changed in: linux (Ubuntu Xenial)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1764956
Title:
Guests using IBRS incur a large performance penalty
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