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Vmware fusion 12 big sur5/18/2023 Workaround: If your security situation allows, you may regain some performance by disabling side channel mitigations.While these features are effective at preventing side channel attacks they can cause noticeable performance degradation in some cases. CPU vendors have introduced a number of features to protect data against this class of attacks such as indirect branch prediction barriers, single thread indirect branch predictor mode, indirect branch restricted speculation mode and L1 data cache flushing. Side channel attacks allow unauthorized read access by malicious processes or virtual machines to the contents of protected kernel or host memory.VMs that have side channel mitigations enabled while running on Fusion on macOS 11 Big Sur may have reduced performance.REST API is now only available to local connections.(this is temporary and not related to licensing) Configuring 32 vCPUs will prompt an error message to reduce the number of cores to 31 or less. A maximum of 31 vCPUs are available when running on the current seed of macOS 11 Big Sur.As always, employ backups when testing beta software! Worksaround: Power Off your VMs before upgrading your host to Big Sur to avoid VM corruption.
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