[Xen-devel] [PATCH 0/8] x86: (allow to) suppress use of hyper-threading

["Jan Beulich" <JBeulich@xxxxxxxx>]

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 point where we not only want,
but need this, and where perhaps it needs to be the default on
affected systems. The first 5 patches are all prerequisites to the
6th one; the final two are simply addressing things I had noticed
while putting together the rest.

1: cpupools: fix state when downing a CPU failed
2: x86: distinguish CPU offlining from CPU removal
3: allow cpu_down() to be called earlier
4: x86/AMD: distinguish compute units from hyper-threads
5: x86: bring up all CPUs even if not all are supposed to be used
6: x86: command line option to avoid use of secondary hyper-threads
7: x86/shim: fully ignore "nosmp" and "maxcpus="
8: cpumask: tidy {,z}alloc_cpumask_var() 

Jan

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



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