diff --git a/arch/x86/kernel/cpu/addon_cpuid_features.c b/arch/x86/kernel/cpu/addon_cpuid_features.c
index a6ef672adbbae01e8da2abb5bf2ae1cb32c091be..0d9c993aa93ed79af1d18dfae976a405332d5ad7 100644
--- a/arch/x86/kernel/cpu/addon_cpuid_features.c
+++ b/arch/x86/kernel/cpu/addon_cpuid_features.c
@@ -7,6 +7,8 @@
 #include <asm/pat.h>
 #include <asm/processor.h>
 
+#include <mach_apic.h>
+
 struct cpuid_bit {
 	u16 feature;
 	u8 reg;
@@ -48,6 +50,92 @@ void __cpuinit init_scattered_cpuid_features(struct cpuinfo_x86 *c)
 	}
 }
 
+/* leaf 0xb SMT level */
+#define SMT_LEVEL	0
+
+/* leaf 0xb sub-leaf types */
+#define INVALID_TYPE	0
+#define SMT_TYPE	1
+#define CORE_TYPE	2
+
+#define LEAFB_SUBTYPE(ecx)		(((ecx) >> 8) & 0xff)
+#define BITS_SHIFT_NEXT_LEVEL(eax)	((eax) & 0x1f)
+#define LEVEL_MAX_SIBLINGS(ebx)		((ebx) & 0xffff)
+
+/*
+ * Check for extended topology enumeration cpuid leaf 0xb and if it
+ * exists, use it for populating initial_apicid and cpu topology
+ * detection.
+ */
+void __cpuinit detect_extended_topology(struct cpuinfo_x86 *c)
+{
+#ifdef CONFIG_SMP
+	unsigned int eax, ebx, ecx, edx, sub_index;
+	unsigned int ht_mask_width, core_plus_mask_width;
+	unsigned int core_select_mask, core_level_siblings;
+
+	if (c->cpuid_level < 0xb)
+		return;
+
+	cpuid_count(0xb, SMT_LEVEL, &eax, &ebx, &ecx, &edx);
+
+	/*
+	 * check if the cpuid leaf 0xb is actually implemented.
+	 */
+	if (ebx == 0 || (LEAFB_SUBTYPE(ecx) != SMT_TYPE))
+		return;
+
+	set_cpu_cap(c, X86_FEATURE_XTOPOLOGY);
+
+	/*
+	 * initial apic id, which also represents 32-bit extended x2apic id.
+	 */
+	c->initial_apicid = edx;
+
+	/*
+	 * Populate HT related information from sub-leaf level 0.
+	 */
+	core_level_siblings = smp_num_siblings = LEVEL_MAX_SIBLINGS(ebx);
+	core_plus_mask_width = ht_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
+
+	sub_index = 1;
+	do {
+		cpuid_count(0xb, sub_index, &eax, &ebx, &ecx, &edx);
+
+		/*
+		 * Check for the Core type in the implemented sub leaves.
+		 */
+		if (LEAFB_SUBTYPE(ecx) == CORE_TYPE) {
+			core_level_siblings = LEVEL_MAX_SIBLINGS(ebx);
+			core_plus_mask_width = BITS_SHIFT_NEXT_LEVEL(eax);
+			break;
+		}
+
+		sub_index++;
+	} while (LEAFB_SUBTYPE(ecx) != INVALID_TYPE);
+
+	core_select_mask = (~(-1 << core_plus_mask_width)) >> ht_mask_width;
+
+#ifdef CONFIG_X86_32
+	c->cpu_core_id = phys_pkg_id(c->initial_apicid, ht_mask_width)
+						 & core_select_mask;
+	c->phys_proc_id = phys_pkg_id(c->initial_apicid, core_plus_mask_width);
+#else
+	c->cpu_core_id = phys_pkg_id(ht_mask_width) & core_select_mask;
+	c->phys_proc_id = phys_pkg_id(core_plus_mask_width);
+#endif
+	c->x86_max_cores = (core_level_siblings / smp_num_siblings);
+
+
+	printk(KERN_INFO  "CPU: Physical Processor ID: %d\n",
+	       c->phys_proc_id);
+	if (c->x86_max_cores > 1)
+		printk(KERN_INFO  "CPU: Processor Core ID: %d\n",
+		       c->cpu_core_id);
+	return;
+#endif
+}
+
 #ifdef CONFIG_X86_PAT
 void __cpuinit validate_pat_support(struct cpuinfo_x86 *c)
 {
diff --git a/arch/x86/kernel/cpu/common_64.c b/arch/x86/kernel/cpu/common_64.c
index ae007b3521cb0961e963eea9e317bc0be663d504..bcb48ce05d23e261a1d996303437a2d3fb042b7e 100644
--- a/arch/x86/kernel/cpu/common_64.c
+++ b/arch/x86/kernel/cpu/common_64.c
@@ -150,6 +150,9 @@ void __cpuinit detect_ht(struct cpuinfo_x86 *c)
 	if (cpu_has(c, X86_FEATURE_CMP_LEGACY))
 		goto out;
 
+	if (cpu_has(c, X86_FEATURE_XTOPOLOGY))
+		return;
+
 	cpuid(1, &eax, &ebx, &ecx, &edx);
 
 	smp_num_siblings = (ebx & 0xff0000) >> 16;
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index c5ac08124adc12fe29a50fabec06e4076cf1aeef..959417b8cd6462e00fde46a4d13d863510c0bd0f 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -176,9 +176,16 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
 	if (p)
 		strcpy(c->x86_model_id, p);
 
-	c->x86_max_cores = num_cpu_cores(c);
-
-	detect_ht(c);
+	detect_extended_topology(c);
+
+	if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
+		/*
+		 * let's use the legacy cpuid vector 0x1 and 0x4 for topology
+		 * detection.
+		 */
+		c->x86_max_cores = num_cpu_cores(c);
+		detect_ht(c);
+	}
 
 	/* Work around errata */
 	Intel_errata_workarounds(c);
diff --git a/arch/x86/kernel/cpu/intel_64.c b/arch/x86/kernel/cpu/intel_64.c
index 0a8128a240dfb3e83b82dfa52d43c0cbee038253..0c0a58dfe0990bb431fc9f9f77787b8d04386ad9 100644
--- a/arch/x86/kernel/cpu/intel_64.c
+++ b/arch/x86/kernel/cpu/intel_64.c
@@ -80,7 +80,10 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
 	if (c->x86 == 6)
 		set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 	set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);
-	c->x86_max_cores = intel_num_cpu_cores(c);
+
+	detect_extended_topology(c);
+	if (!cpu_has(c, X86_FEATURE_XTOPOLOGY))
+		c->x86_max_cores = intel_num_cpu_cores(c);
 
 	srat_detect_node();
 }
diff --git a/arch/x86/kernel/genx2apic_cluster.c b/arch/x86/kernel/genx2apic_cluster.c
index fed9f68efd665bd823378a9d1ebf9624959f5536..e4bf2cc0d743998b069925574ff93c559f7c24f3 100644
--- a/arch/x86/kernel/genx2apic_cluster.c
+++ b/arch/x86/kernel/genx2apic_cluster.c
@@ -120,14 +120,9 @@ static unsigned long set_apic_id(unsigned int id)
 	return x;
 }
 
-static unsigned int x2apic_read_id(void)
-{
-	return apic_read(APIC_ID);
-}
-
 static unsigned int phys_pkg_id(int index_msb)
 {
-	return x2apic_read_id() >> index_msb;
+	return current_cpu_data.initial_apicid >> index_msb;
 }
 
 static void x2apic_send_IPI_self(int vector)
diff --git a/arch/x86/kernel/genx2apic_phys.c b/arch/x86/kernel/genx2apic_phys.c
index 958d537b4cc978789b2221d6e0e93dc8267ea04f..8f1343df2627116e1c254f59ccd6f5525ed5f8b2 100644
--- a/arch/x86/kernel/genx2apic_phys.c
+++ b/arch/x86/kernel/genx2apic_phys.c
@@ -118,14 +118,9 @@ static unsigned long set_apic_id(unsigned int id)
 	return x;
 }
 
-static unsigned int x2apic_read_id(void)
-{
-	return apic_read(APIC_ID);
-}
-
 static unsigned int phys_pkg_id(int index_msb)
 {
-	return x2apic_read_id() >> index_msb;
+	return current_cpu_data.initial_apicid >> index_msb;
 }
 
 void x2apic_send_IPI_self(int vector)
diff --git a/include/asm-x86/cpufeature.h b/include/asm-x86/cpufeature.h
index 6dfa2b3f18c7d0b29040c37e3392585546cc8351..7ac4d93d20ed7e4aa54f011f976909f2c37389ad 100644
--- a/include/asm-x86/cpufeature.h
+++ b/include/asm-x86/cpufeature.h
@@ -89,6 +89,7 @@
 #define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* "" Lfence synchronizes RDTSC */
 #define X86_FEATURE_11AP	(3*32+19) /* "" Bad local APIC aka 11AP */
 #define X86_FEATURE_NOPL	(3*32+20) /* The NOPL (0F 1F) instructions */
+#define X86_FEATURE_XTOPOLOGY	(3*32+21) /* cpu topology enum extensions */
 
 /* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
 #define X86_FEATURE_XMM3	(4*32+ 0) /* "pni" SSE-3 */
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h
index ae5bd1abe76673b8b67bb7887b2e893e7bf2e096..bbbbe1fc5ce1095ca9597a284fba9d1f6d5646ed 100644
--- a/include/asm-x86/processor.h
+++ b/include/asm-x86/processor.h
@@ -165,6 +165,7 @@ extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 extern unsigned short num_cache_leaves;
 
+extern void detect_extended_topology(struct cpuinfo_x86 *c);
 #if defined(CONFIG_X86_HT) || defined(CONFIG_X86_64)
 extern void detect_ht(struct cpuinfo_x86 *c);
 #else