[PATCH 6/5] x86/nmi: Support watchdogs on Intel Fam18/19 CPUs

[Andrew Cooper <andrew.cooper3@citrix.com>]

It is the Pentium 4 (Fam15) which is the odd-one-out.  The counter indicies
used in the P6 went on to be declared architectural, and Fam18/19 continue
using the architectural indices.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <jbeulich@suse.com>
CC: Roger Pau Monné <roger@xenproject.org>
CC: Teddy Astie <teddy.astie@vates.tech>

This wants backporting to 4.21.  So does "Check MSR_MISC_ENABLE for all Intel
platforms" on which it texturally depends.
---
 xen/arch/x86/nmi.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/xen/arch/x86/nmi.c b/xen/arch/x86/nmi.c
index b3d18270b13a..0a03ef68b586 100644
--- a/xen/arch/x86/nmi.c
+++ b/xen/arch/x86/nmi.c
@@ -329,17 +329,12 @@ void setup_apic_nmi_watchdog(void)
             break;
         }
 
-        switch ( boot_cpu_data.family )
-        {
-        case 6:
+        if ( boot_cpu_data.family == 15 )
+            setup_p4_watchdog(misc);
+        else
             setup_p6_watchdog((boot_cpu_data.model < 14)
                               ? P6_EVENT_CPU_CLOCKS_NOT_HALTED
                               : CORE_EVENT_CPU_CLOCKS_NOT_HALTED);
-            break;
-        case 15:
-            setup_p4_watchdog(misc);
-            break;
-        }
         break;
     }
 
-- 
2.39.5