Messages in this thread | | | Date | Wed, 10 Jan 2018 14:53:28 +0100 (CET) | From | Thomas Gleixner <> | Subject | RE: [patch RFC 5/5] x86/speculation: Add basic speculation control code |
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On Wed, 10 Jan 2018, Van De Ven, Arjan wrote: > > So here is the simple list of questions all to be answered with YES or > > NO. I don't want to see any of the 'but, though ...'. We all know by now > > that it's CPU dependent and slow and whatever and that IBRS_ATT will be in > > future CPUs. So get your act together and tell a clear YES or NO.
> > 2) Does toggle mode of IBRS require retpoline ? > > NO > > > > > 3) Does toggle mode of IBRS require RSB stuffing ? > > Only for the VM exit case
Ok.
> > > > 4) Exist CPUs which require IBRS to be selected automatically ? > > I do not understand your question exactly
Whether the kernel should enable IBRS by default on certain models. And if yes, which ones.
Thanks,
tglx
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