Re: L1TF: Disabling EPT / performance-impact

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Greg KH schrieb:
> 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
> 

Sorry, wrong target-group then.
Have a good day!

Rainer Fiebig



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