Just now, has published new Updates for and mitigation: VMSA-2018-0004 - VMware vSphere, Workstation and Fusion updates add Hypervisor-Assisted Guest Remediation for speculative execution issue

Interesting news from that is that both Intel and AMD have supplied Microcode-Updates by now, as explained in the accompanying KB article:

Quote from the knowledgebase article:

An Intel CPU with updated microcode will have a non-zero value in host CPUID[7].EDX[26:27].
An AMD CPU with updated its microcode will have a non-zero value in host CPUID[0x80000008].EBX[12].

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