x86/nmi: Check MSR_MISC_ENABLE for all Intel platforms

Right now it's only checked in setup_p4_watchdog(), and not in
setup_p6_watchdog().

Perform the check in the common Intel path in setup_apic_nmi_watchdog(), and
pass misc_enable as a parameter into setup_p4_watchdog() to avoid reading it
twice.

Fixes: 0dfba864fb ("NMI watchdog support in Xen.")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
master commit: dfb428cb11
master date: 2026-08-18 12:51:08 +0100

xen/arch/x86/nmi.c

@@ -345,14 +345,8 @@ static void setup_p6_watchdog(unsigned counter)
     wrmsr(MSR_P6_EVNTSEL(0), evntsel, 0);
 }
 
-static void setup_p4_watchdog(void)
+static void setup_p4_watchdog(uint64_t misc_enable)
 {
-    uint64_t misc_enable;
-
-    rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
-    if (!(misc_enable & MSR_IA32_MISC_ENABLE_PERF_AVAIL))
-        return;
-
     nmi_perfctr_msr = MSR_P4_IQ_PERFCTR0;
     nmi_p4_cccr_val = P4_NMI_IQ_CCCR0;
     if ( boot_cpu_data.x86_num_siblings == 2 )
@@ -384,6 +378,8 @@ static void setup_p4_watchdog(void)
 
 void setup_apic_nmi_watchdog(void)
 {
+    uint64_t misc;
+
     if ( nmi_watchdog == NMI_NONE )
         return;
 
@@ -394,6 +390,14 @@ void setup_apic_nmi_watchdog(void)
         break;
 
     case X86_VENDOR_INTEL:
+        rdmsrl(MSR_IA32_MISC_ENABLE, misc);
+
+        if ( !(misc & MSR_IA32_MISC_ENABLE_PERF_AVAIL) )
+        {
+            printk(XENLOG_WARNING "Intel Perfmon unavailable\n");
+            break;
+        }
+
         switch (boot_cpu_data.x86) {
         case 6:
             setup_p6_watchdog((boot_cpu_data.x86_model < 14) 
@@ -401,7 +405,7 @@ void setup_apic_nmi_watchdog(void)
                               : CORE_EVENT_CPU_CLOCKS_NOT_HALTED);
             break;
         case 15:
-            setup_p4_watchdog();
+            setup_p4_watchdog(misc);
             break;
         }
         break;