I wonder, if live migration (back and forth) is possible on mixed
Haswell (Xeon V3) and Broadwell (Xeon V4) installations. The only
notable difference between the two is apparently a working TSX
implementation on V4, which got disabled on V3 due to bugs. The rest
(VMCS-shadowing, posted interrupts) should not apply to our environment,
as we do not run nested-vmx nor device-passthrough on our Xen servers.
Now, I found no sane way to disable TSX on a given system but I cannot
rule out, that some (Linux-)software, such as Postgres will use them
eventually. Also, I have a hard time trying to assess, if TSX can be
disabled on V4 to enable seamless migration.
Any hint would be greately appreciated.
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