Running a new install of Qubes r4.0.1 on an ultrabook based on the m5-6Y54 
processor / SOC. Xentop shows it as having only 2 cores.

When the same machine boots into Debian on bare metal, with no BIOS changes, 
top shows it as having four.

The Intel spec is 2 cores running 4 threads, so the difference is clearly about 
hyperthreading.

Is it possible to get Xen in Qubes to enable hyperthreading?

And if so how?

Are there any obvs pitfalls or technical issues to explain why Xen turns it off?

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