From technical point of view, the Intel CPU design limitation jeopardize downstream product vendor. VMware is one of the vendor do the remediation immediately. A memory bank built into the CPU chip. Also known as the “primary cache,” an L1 cache is the fastest memory in the computer and closest to the processor. Let’s think it over? If memory is allocated by the VMkernel and virtualized by monitor. CPU is controlled by scheduler and virtualized by monitor. If address translations may allow unauthorized disclosure of information residing in the L1 data cache? So, the attacker with local user access with guest OS privilege via a terminal page fault and a side-channel analysis equilvant as a monitor.

As such , VMware do the following:

https://www.vmware.com/security/advisories/VMSA-2018-0020.html