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See https://news.ycombinator.com/item?id=32607709 https://news.ycombinator.com/item?id=32607709; in addition to what you say, enabling IBRS basically comes for

See https://news.ycombinator.com/item?id=32607709 https://news.ycombinator.com/item?id=32607709; in addition to what you say, enabling IBRS basically comes for free in Xen because its "userspace" is actually guest kernel code that can itself control processor speculation.

monocasa 4y ago
Whatever comment you linked to seems to be deleted. Can you summarize?
- glandium 4y ago
  The link is good, but a semi-colon got stuck to it. If you remove the semi-colon, you'll get to the comment.