Messages in this thread | | | Subject | Re: [RFC,05/10] x86/speculation: Add basic IBRS support infrastructure | From | Arjan van de Ven <> | Date | Mon, 29 Jan 2018 12:44:16 -0800 |
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On 1/29/2018 12:42 PM, Eduardo Habkost wrote: > The question is how the hypervisor could tell that to the guest. > If Intel doesn't give us a CPUID bit that can be used to tell > that retpolines are enough, maybe we should use a hypervisor > CPUID bit for that?
the objective is to have retpoline be safe everywhere and never use IBRS (Linus was also pretty clear about that) so I'm confused by your question
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