10924 Need mitigation of L1TF (CVE-2018-3646)
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>
Reviewed by: Peter Tribble <peter.tribble@gmail.com>

*** 349,358 ****
--- 349,360 ----
          kmutex_t        t_ctx_lock;     /* protects t_ctx in removectx() */
          struct waitq    *t_waitq;       /* wait queue */
          kmutex_t        t_wait_mutex;   /* used in CV wait functions */
  
          char            *t_name;        /* thread name */
+ 
+         uint64_t        t_unsafe;       /* unsafe to run with HT VCPU thread */
  } kthread_t;
  
  /*
   * Thread flag (t_flag) definitions.
   *      These flags must be changed only for the current thread,
*** 411,420 ****
--- 413,423 ----
  #define TS_SWAPENQ      0x0004  /* swap thread when it reaches a safe point */
  #define TS_ON_SWAPQ     0x0008  /* thread is on the swap queue */
  #define TS_SIGNALLED    0x0010  /* thread was awakened by cv_signal() */
  #define TS_PROJWAITQ    0x0020  /* thread is on its project's waitq */
  #define TS_ZONEWAITQ    0x0040  /* thread is on its zone's waitq */
+ #define TS_VCPU         0x0080  /* thread will enter guest context */
  #define TS_CSTART       0x0100  /* setrun() by continuelwps() */
  #define TS_UNPAUSE      0x0200  /* setrun() by unpauselwps() */
  #define TS_XSTART       0x0400  /* setrun() by SIGCONT */
  #define TS_PSTART       0x0800  /* setrun() by /proc */
  #define TS_RESUME       0x1000  /* setrun() by CPR resume process */