Is AIX/Power safe from Spectre / Meltdown? Since Intel, AMD and ARM is affected by the Spectre and Meltdown cpu kernel memory leak bugs/flaws, could we say that Power architecture is safe from these?

No, you could not say it's safe.

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> Complete mitigation of this vulnerability for Power Systems clients involves installing patches to both system firmware and operating systems. The firmware patch provides partial remediation to these vulnerabilities and is a pre-requisite for the OS patch to be effective.
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> Firmware patches for POWER7+, POWER8, and POWER9 platforms are **now available** via FixCentral. POWER7 patches will be available beginning **February 7**.
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> AIX patches will be available beginning **January 26** and will continue to be rolled out through **February 12**.

Update : patches available, <