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[Xen-devel] [PATCH v3 0/4] x86: allow to suppress use of hyper-threading

I've been considering to add a respective command line option for
quite a long time, but never got around to. Now that the TLBleed
information is public[1], we're at a point where we not only want,
but need this, and where perhaps it needs to be the default on
affected systems. The first 2 patches are prerequisites to the 3rd
one; the final one is simply cleanup.

I've retained all tags provided for v2, as the changes are really
small and have largely been requested for the tags to apply.

1: x86: distinguish CPU offlining from CPU removal
2: x86: bring up all CPUs even if not all are supposed to be used
3: x86: command line option to avoid use of secondary hyper-threads
4: cpumask: tidy {,z}alloc_cpumask_var() 


[1] https://www.vusec.net/projects/tlbleed/

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