>> I'm now wondering if there is a Xen
>> setting to force Xen to allocate both virtual cores in the same physical
>> core together?

> I don't know but I wouldn't expect one to appear in an old xen.
> Given R4.0 is 4.8 so if such feature is there, most likely that's not
available until some future Qubes version. 

Turns out that's exactly so. The Xen wizards were working on it August 2019, 
and it's now in a testing or unstable build, so it will be a while before it 
gets into a stable Xen release, and then longer till Qubes adopts it. 

https://patchwork.kernel.org/cover/11086677/

The parameter is sched-gran=core (or socket or cpu) with the default bring CPU.

The version of Xen currently used by Qubes 4.0.1 accepts the parameter without 
giving an error, but also without complying. 

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