On 11/14/2017 03:13 AM, T.Weyergraf wrote:
> Hi
>
> 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.
Have you looked at CPUID masking? I haven't tried this but someone wrote a
handy calculator for it. https://github.com/twizted/xen_maskcalc
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