OS-7125 Need mitigation of L1TF (CVE-2018-3646)
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 18,28 ****
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright (c) 2017 by Delphix. All rights reserved.
   */
  
  #include <sys/types.h>
  #include <sys/systm.h>
  #include <sys/cmn_err.h>
--- 18,28 ----
   *
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
!  * Copyright 2018 Joyent, Inc.
   */
  
  #include <sys/types.h>
  #include <sys/systm.h>
  #include <sys/cmn_err.h>
*** 568,579 ****
                                  ASSERT(t->t_lpl->lpl_ncpu > 0);
  
                                  /* Update CPU last ran on if it was this CPU */
                                  if (t->t_cpu == cp && t->t_cpupart == oldpp &&
                                      t->t_bound_cpu != cp) {
!                                         t->t_cpu = disp_lowpri_cpu(ncp,
!                                             t->t_lpl, t->t_pri, NULL);
                                  }
                                  t = t->t_forw;
                          } while (t != p->p_tlist);
  
                          /*
--- 568,579 ----
                                  ASSERT(t->t_lpl->lpl_ncpu > 0);
  
                                  /* Update CPU last ran on if it was this CPU */
                                  if (t->t_cpu == cp && t->t_cpupart == oldpp &&
                                      t->t_bound_cpu != cp) {
!                                         t->t_cpu = disp_lowpri_cpu(ncp, t,
!                                             t->t_pri);
                                  }
                                  t = t->t_forw;
                          } while (t != p->p_tlist);
  
                          /*
*** 621,632 ****
                          ASSERT(t->t_lpl->lpl_ncpu > 0);
  
                          /* Update CPU last ran on if it was this CPU */
                          if (t->t_cpu == cp && t->t_cpupart == oldpp &&
                              t->t_bound_cpu != cp) {
!                                 t->t_cpu = disp_lowpri_cpu(ncp, t->t_lpl,
!                                     t->t_pri, NULL);
                          }
  
                          t = t->t_next;
                  } while (t != curthread);
  
--- 621,632 ----
                          ASSERT(t->t_lpl->lpl_ncpu > 0);
  
                          /* Update CPU last ran on if it was this CPU */
                          if (t->t_cpu == cp && t->t_cpupart == oldpp &&
                              t->t_bound_cpu != cp) {
!                                 t->t_cpu = disp_lowpri_cpu(ncp, t,
!                                     t->t_pri);
                          }
  
                          t = t->t_next;
                  } while (t != curthread);