Re: [RFC,05/10] x86/speculation: Add basic IBRS support infrastructure

[David Woodhouse]

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/2018/1/22/598Âshould cover most of that, I think.

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