Linux 6.5-rc4 Brings Change For Enabling STIBP On AMD Zen 4 Auto IBRS Systems

Last weekend I wrote about Zen 4's Automatic IBRS security feature needing STIBP enabled for protecting user-space processes. Single-Threaded Indirect Branch Predictors though haven't been enabled up to now with the Auto IBRS functionality on Linux. But the x86/urgent pull request sent out today ahead of the Linux 6.5-rc4 tagging makes that change...