[PATCH 2/3] x86/Intel: skip CORE_THREAD_COUNT read on family 0xf

[Jan Beulich]

This avoids an unnecessary (and always somewhat scary) log message for
the recovered from #GP(0).

Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
Perhaps even use "== 6" in the family check?

--- a/xen/arch/x86/spec_ctrl.c
+++ b/xen/arch/x86/spec_ctrl.c
@@ -453,7 +453,8 @@ static bool __init check_smt_enabled(voi
      * At the time of writing, it is almost completely undocumented, so isn't
      * virtualised reliably.
      */
-    if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && !cpu_has_hypervisor &&
+    if ( boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
+         boot_cpu_data.x86 != 0xf && !cpu_has_hypervisor &&
          !rdmsr_safe(MSR_INTEL_CORE_THREAD_COUNT, val) )
         return (MASK_EXTR(val, MSR_CTC_CORE_MASK) !=
                 MASK_EXTR(val, MSR_CTC_THREAD_MASK));