Whether the hypervisor should flush the L1 data cache before entering guests. See also .
null: uses the kernel default"never": disables L1 data cache flushing entirely. May be appropriate if all guests are trusted."cond": flushes L1 data cache only for pre-determined code paths. May leak information about the host address space layout."always": flushes L1 data cache every time the hypervisor enters the guest. May incur significant performance cost.
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