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Date: Sun, 27 Sep 2009 00:15:47 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: print out microcode patch level
warning if there are not consistent between cpus
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
arch/x86/kernel/cpu/amd.c | 27 +++++++++++++++++++++++++++
arch/x86/kernel/cpu/intel.c | 27 +++++++++++++++++++++++++++
2 files changed, 54 insertions(+)
Index: linux-2.6/arch/x86/kernel/cpu/amd.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/amd.c
+++ linux-2.6/arch/x86/kernel/cpu/amd.c
@@ -439,6 +439,31 @@ static void __cpuinit early_init_amd(str
#endif
}
+static u32 __cpuinitdata boot_cpu_microcode_level;
+
+static void __cpuinit check_amd_microcode_level(struct cpuinfo_x86 *c)
+{
+ u32 level, dummy;
+ unsigned int cpu_index = 0;
+
+#ifdef CONFIG_SMP
+ cpu_index = c->cpu_index;
+#endif
+
+ rdmsr(MSR_AMD64_PATCH_LEVEL, level, dummy);
+
+ printk(KERN_INFO "CPU %d microcode level: 0x%x\n", cpu_index, level);
+
+#ifdef CONFIG_SMP
+ if (cpu_index == boot_cpu_id)
+ boot_cpu_microcode_level = level;
+ else if (boot_cpu_microcode_level != level)
+ printk(KERN_WARNING
+ "CPU %d microcode level 0x%x is not same to boot cpu\n",
+ cpu_index, level);
+#endif
+}
+
static void __cpuinit init_amd(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_SMP
@@ -562,6 +587,8 @@ static void __cpuinit init_amd(struct cp
set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
}
+ check_amd_microcode_level(c);
+
#ifdef CONFIG_X86_64
if (c->x86 == 0x10) {
/* do this for boot cpu */
Index: linux-2.6/arch/x86/kernel/cpu/intel.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/intel.c
+++ linux-2.6/arch/x86/kernel/cpu/intel.c
@@ -327,6 +327,31 @@ static void __cpuinit detect_vmx_virtcap
}
}
+static u32 __cpuinitdata boot_cpu_microcode_level;
+
+static void __cpuinit check_intel_microcode_level(struct cpuinfo_x86 *c)
+{
+ u32 level, dummy;
+ unsigned int cpu_index = 0;
+
+#ifdef CONFIG_SMP
+ cpu_index = c->cpu_index;
+#endif
+
+ rdmsr(MSR_IA32_UCODE_REV, dummy, level);
+
+ printk(KERN_INFO "CPU %d microcode level: 0x%x\n", cpu_index, level);
+
+#ifdef CONFIG_SMP
+ if (cpu_index == boot_cpu_id)
+ boot_cpu_microcode_level = level;
+ else if (boot_cpu_microcode_level != level)
+ printk(KERN_WARNING
+ "CPU %d microcode level 0x%x is not same to boot cpu\n",
+ cpu_index, level);
+#endif
+}
+
static void __cpuinit init_intel(struct cpuinfo_x86 *c)
{
unsigned int l2 = 0;
@@ -432,6 +457,8 @@ static void __cpuinit init_intel(struct
/* Work around errata */
srat_detect_node(c);
+ check_intel_microcode_level(c);
+
if (cpu_has(c, X86_FEATURE_VMX))
detect_vmx_virtcap(c);
}
--
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