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Use PowerShell to see if you are mitigating Meltdown and Spectre

Microsoft has released a PowerShell module on PSGallery that can test if you are mitigating the issues that Meltdown and Spectre are using.

Simply run the following command in an elevated PowerShell window:

Install-Module SpeculationControl

Then use the following command to verify mitigations:


This was the result om my laptop (Lenovo X1 Yoga) before patching it:


Then I installed this patch (via regular Windows Update):

Update history

After installing the patch and rebooting, it looked much better:

SpeculationControl-X1_efter update

Note that some of my older hardware only managed to mitigate some of them, and some mitigations are sometimes not turned on by default, due to some dependencies.

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