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OS-6546 Use PCID if KPTI is enabled

*** 1794,1803 **** --- 1794,1805 ---- * it's set. So the startup thread may have no chance to switch back * again if it's switched away with CPU_QUIESCED set. */ cp->cpu_flags &= ~(CPU_POWEROFF | CPU_QUIESCED); + enable_pcid(); + /* * Setup this processor for XSAVE. */ if (fp_save_mech == FP_XSAVE) { xsave_setup_msr(cp);