[Xen-devel] [PATCH] x86/Intel: quiesce revised CPUID level message

["Jan Beulich" <JBeulich@xxxxxxxx>]

Print this only once, for the boot CPU, unless "cpuinfo" was specified.
I found this particularly annoying on a machine which also didn't have
it MTRRs consistently set up across cores, resulting in the printing of
those messages being awfully slow (and with a second per-CPU message
added for debugging purposes this even lead to timeouts during AP
bringup).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/cpu/intel.c
+++ b/xen/arch/x86/cpu/intel.c
@@ -139,7 +139,9 @@ void __devinit early_intel_workaround(st
                        misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
                        wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
                        c->cpuid_level = cpuid_eax(0);
-                       printk("revised cpuid_level = %d\n", c->cpuid_level);
+                       if (opt_cpu_info || c == &boot_cpu_data)
+                               printk(KERN_INFO "revised cpuid level: %d\n",
+                                      c->cpuid_level);
                }
        }
 }

Attachment: x86-intel-revised-cpuid-level-once.patch
Description: Text document

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