On Linux one needs to recompile kernel modules to get protection, while on Solaris this is not necessary. Once you are on Solaris 11.4 with Spectre fixes enabled, all kernel modules, even compiled on older Solaris releases, just work and are protected. Nothing special to do there.
That plumbing is nice in Solaris but doesn't really matter if the Solaris X64 platform is being pushed aside by Oracle. Witness the lack of JDK9 and beyond distributions.
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