On Mon, 2018-01-29 at 18:14 -0200, Eduardo Habkost wrote: > > Sorry for being confused here, as probably the answer is buried > on a LKML thread somewhere. The comment explains what the code > does, but not why. Why exactly IBRS is preferred on Skylake? > > I'm asking this because I would like to understand the risks > involved when running under a hypervisor exposing CPUID data that > don't match the host CPU. e.g.: what happens if a VM is migrated > from a Broadwell host to a Skylake host? https://lkml.org/lkml/2018/1/22/598 should cover most of that, I think.
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