10597 would like a way to set NMI behavior at boot
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Andy Fiddaman <andy@omniosce.org>

@@ -21,11 +21,11 @@
 /*
  * Copyright (c) 2012 Gary Mills
  *
  * Copyright (c) 1993, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2011 by Delphix. All rights reserved.
- * Copyright 2018 Joyent, Inc.
+ * Copyright 2019, Joyent, Inc.
  */
 /*
  * Copyright (c) 2010, Intel Corporation.
  * All rights reserved.
  */

@@ -59,10 +59,12 @@
 #include <sys/boot_console.h>
 #include <sys/kdi_machimpl.h>
 #include <sys/archsystm.h>
 #include <sys/promif.h>
 #include <sys/pci_cfgspace.h>
+#include <sys/apic.h>
+#include <sys/apic_common.h>
 #include <sys/bootvfs.h>
 #include <sys/tsc.h>
 #ifdef __xpv
 #include <sys/hypervisor.h>
 #else

@@ -77,10 +79,12 @@
 extern uint32_t cpuid_feature_ecx_include;
 extern uint32_t cpuid_feature_ecx_exclude;
 extern uint32_t cpuid_feature_edx_include;
 extern uint32_t cpuid_feature_edx_exclude;
 
+nmi_action_t nmi_action = NMI_ACTION_UNSET;
+
 /*
  * Set console mode
  */
 static void
 set_console_mode(uint8_t val)

@@ -101,10 +105,11 @@
  */
 void
 mlsetup(struct regs *rp)
 {
         u_longlong_t prop_value;
+        char prop_str[BP_MAX_STRLEN];
         extern struct classfuncs sys_classfuncs;
         extern disp_t cpu0_disp;
         extern char t0stack[];
         extern int post_fastreboot;
         extern uint64_t plat_dr_options;

@@ -147,10 +152,23 @@
                 cpuid_feature_edx_exclude = 0;
         else
                 cpuid_feature_edx_exclude = (uint32_t)prop_value;
 
 #if !defined(__xpv)
+        if (bootprop_getstr("nmi", prop_str, sizeof (prop_str)) == 0) {
+                if (strcmp(prop_str, "ignore") == 0) {
+                        nmi_action = NMI_ACTION_IGNORE;
+                } else if (strcmp(prop_str, "panic") == 0) {
+                        nmi_action = NMI_ACTION_PANIC;
+                } else if (strcmp(prop_str, "kmdb") == 0) {
+                        nmi_action = NMI_ACTION_KMDB;
+                } else {
+                        prom_printf("unix: ignoring unknown nmi=%s\n",
+                            prop_str);
+                }
+        }
+
         /*
          * Check to see if KPTI has been explicitly enabled or disabled.
          * We have to check this before init_desctbls().
          */
         if (bootprop_getval("kpti", &prop_value) == 0) {