x86: relax some CPU checks for non-64 bit CPUs

These checks were guarding against non-64 bit CPU models but they are
not supported by Xen anymore so the checks are no longer needed.

The switch statement was removed from mcheck_init()
to support Intel family 18/19.

Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Kevin Lampis <kevin.lampis@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/acpi/cpu_idle.c

@@ -1059,9 +1059,8 @@ static void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flag
      * is not required while entering C3 type state on
      * P4, Core and beyond CPUs
      */
-    if ( c->x86_vendor == X86_VENDOR_INTEL &&
-        (c->x86 > 0x6 || (c->x86 == 6 && c->x86_model >= 14)) )
-            flags->bm_control = 0;
+    if ( c->x86_vendor == X86_VENDOR_INTEL )
+        flags->bm_control = 0;
 }
 
 #define VENDOR_INTEL                   (1)

xen/arch/x86/cpu/mcheck/mce.c

@@ -777,13 +777,7 @@ void mcheck_init(struct cpuinfo_x86 *c, bool bsp)
 
 #ifdef CONFIG_INTEL
     case X86_VENDOR_INTEL:
-        switch ( c->x86 )
-        {
-        case 6:
-        case 15:
-            inited = intel_mcheck_init(c, bsp);
-            break;
-        }
+        inited = intel_mcheck_init(c, bsp);
         break;
 #endif
 

xen/arch/x86/cpu/mtrr/generic.c

@@ -218,8 +218,7 @@ static void __init print_mtrr_state(const char *level)
 			printk("%s  %u disabled\n", level, i);
 	}
 
-	if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
-	     boot_cpu_data.x86 >= 0xf) ||
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD ||
 	     boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
 		uint64_t syscfg, tom2;