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Rusty Bird:
> To me as a layman, it looks like Qubes is indeed vulnerable to the
> XSA-273 data leak, and that fixing it involves
> 
> 1. disabling hyperthreading (by adding smt=off to the Xen command line)
> 2. AND upgrading Intel microcode to 20180807
> 3. AND upgrading Xen

https://groups.google.com/d/msg/qubes-users/v5UPnWmnzJY/WG9lmyxYAgAJ

=> There's no point in manually adding the smt=off parameter - Qubes'
latest Xen 4.8.4-1 package doesn't support it yet, and I imagine the
next package version is going to add it automatically.

Rusty
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