On Thu, Aug 16, 2018 at 01:41:26PM +0200, Rainer Fiebig wrote: > Hi! > > According to 1), disabling EPT offers the same maximum protection against L1TF as disabling SMT but > has a severe performance impact. > > FWIW: With EPT disabled (2)), I can *not* confirm any performance-degradation for the VirtualBox > Windows- or Linux-VMs that I use. Those VMs are for desktop-use, though. > > So to me it seems that the performance impact depends on the use case and in a desktop-setting > disabling EPT may offer a simple max-protection-option with the advantage of still enabled > hyperthreading. > > I have tried this with 4.18.1 and 4.14.63. Why are you sending this to the stable@ list? There's nothing we can do here, sorry. greg k-h
