This path enables AMD OSVW (OS Visible Workaround) feature for Xen. New
AMD errata will have a OSVW id assigned in the future. OS is supposed to
check OSVW status MSR to find out whether CPU has a specific erratum.
Legacy errata are also supported in this patch: traditional
family/model/stepping approach will be used if OSVW feature isn't
applicable. This patch is adapted from Hans Rosenfeld's patch submitted
to Linux kernel .
Signed-off-by: Wei Huang <wei.huang2@xxxxxxx>
Signed-off-by: Hans Rosenfeld <hands.rosenfeld@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxxxx>
diff -r aecf092da748 xen/arch/x86/cpu/amd.c
--- a/xen/arch/x86/cpu/amd.c Wed Jun 30 22:12:54 2010 +0100
+++ b/xen/arch/x86/cpu/amd.c Thu Jul 01 14:01:45 2010 -0500
@@ -7,12 +7,12 @@
#include <asm/io.h>
#include <asm/msr.h>
#include <asm/processor.h>
+#include <asm/amd.h>
#include <asm/hvm/support.h>
#include <asm/setup.h> /* amd_init_cpu */
#include <asm/acpi.h>
#include "cpu.h"
-#include "amd.h"
/*
* Pre-canned values for overriding the CPUID features
@@ -145,6 +145,54 @@
wrmsr_amd(MSR_K8_FEATURE_MASK, feat_edx, feat_ecx);
wrmsr_amd(MSR_K8_EXT_FEATURE_MASK, extfeat_edx, extfeat_ecx);
}
+}
+
+/*
+ * Check for the presence of an AMD erratum. Arguments are defined in amd.h
+ * for each known erratum. Return 1 if erratum is found.
+ */
+int cpu_has_amd_erratum(const struct cpuinfo_x86 *cpu, int osvw, ...)
+{
+ va_list ap;
+ u32 range;
+ u32 ms;
+
+ if (cpu->x86_vendor != X86_VENDOR_AMD)
+ return 0;
+
+ va_start(ap, osvw);
+
+ if (osvw) {
+ u16 osvw_id = va_arg(ap, int);
+
+ if (cpu_has(cpu, X86_FEATURE_OSVW)) {
+ u64 osvw_len;
+ rdmsrl(MSR_AMD_OSVW_ID_LENGTH, osvw_len);
+
+ if (osvw_id < osvw_len) {
+ u64 osvw_bits;
+ rdmsrl(MSR_AMD_OSVW_STATUS + (osvw_id >> 6),
+ osvw_bits);
+
+ va_end(ap);
+ return (osvw_bits >> (osvw_id & 0x3f)) & 0x01;
+ }
+ }
+ }
+
+ /* OSVW unavailable or ID unknown, match family-model-stepping range */
+ ms = (cpu->x86_model << 8) | cpu->x86_mask;
+ while ((range = va_arg(ap, int))) {
+ if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
+ (ms >= AMD_MODEL_RANGE_START(range)) &&
+ (ms <= AMD_MODEL_RANGE_END(range))) {
+ va_end(ap);
+ return 1;
+ }
+ }
+
+ va_end(ap);
+ return 0;
}
/*
diff -r aecf092da748 xen/arch/x86/cpu/amd.h
--- a/xen/arch/x86/cpu/amd.h Wed Jun 30 22:12:54 2010 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,103 +0,0 @@
-/*
- * amd.h - AMD processor specific definitions
- */
-
-#ifndef __AMD_H__
-#define __AMD_H__
-
-#include <asm/cpufeature.h>
-
-/* CPUID masked for use by AMD-V Extended Migration */
-
-#define X86_FEATURE_BITPOS(_feature_) ((_feature_) % 32)
-#define __bit(_x_) (1U << X86_FEATURE_BITPOS(_x_))
-
-/* Family 0Fh, Revision C */
-#define AMD_FEATURES_K8_REV_C_ECX 0
-#define AMD_FEATURES_K8_REV_C_EDX ( \
- __bit(X86_FEATURE_FPU) | __bit(X86_FEATURE_VME) | \
- __bit(X86_FEATURE_DE) | __bit(X86_FEATURE_PSE) | \
- __bit(X86_FEATURE_TSC) | __bit(X86_FEATURE_MSR) | \
- __bit(X86_FEATURE_PAE) | __bit(X86_FEATURE_MCE) | \
- __bit(X86_FEATURE_CX8) | __bit(X86_FEATURE_APIC) | \
- __bit(X86_FEATURE_SEP) | __bit(X86_FEATURE_MTRR) | \
- __bit(X86_FEATURE_PGE) | __bit(X86_FEATURE_MCA) | \
- __bit(X86_FEATURE_CMOV) | __bit(X86_FEATURE_PAT) | \
- __bit(X86_FEATURE_PSE36) | __bit(X86_FEATURE_CLFLSH)| \
- __bit(X86_FEATURE_MMX) | __bit(X86_FEATURE_FXSR) | \
- __bit(X86_FEATURE_XMM) | __bit(X86_FEATURE_XMM2))
-#define AMD_EXTFEATURES_K8_REV_C_ECX 0
-#define AMD_EXTFEATURES_K8_REV_C_EDX (
\
- __bit(X86_FEATURE_FPU) | __bit(X86_FEATURE_VME) | \
- __bit(X86_FEATURE_DE) | __bit(X86_FEATURE_PSE) | \
- __bit(X86_FEATURE_TSC) | __bit(X86_FEATURE_MSR) | \
- __bit(X86_FEATURE_PAE) | __bit(X86_FEATURE_MCE) | \
- __bit(X86_FEATURE_CX8) | __bit(X86_FEATURE_APIC) | \
- __bit(X86_FEATURE_SYSCALL) | __bit(X86_FEATURE_MTRR) | \
- __bit(X86_FEATURE_PGE) | __bit(X86_FEATURE_MCA) | \
- __bit(X86_FEATURE_CMOV) | __bit(X86_FEATURE_PAT) | \
- __bit(X86_FEATURE_PSE36) | __bit(X86_FEATURE_NX) | \
- __bit(X86_FEATURE_MMXEXT) | __bit(X86_FEATURE_MMX) | \
- __bit(X86_FEATURE_FXSR) | __bit(X86_FEATURE_LM) | \
- __bit(X86_FEATURE_3DNOWEXT) | __bit(X86_FEATURE_3DNOW))
-
-/* Family 0Fh, Revision D */
-#define AMD_FEATURES_K8_REV_D_ECX AMD_FEATURES_K8_REV_C_ECX
-#define AMD_FEATURES_K8_REV_D_EDX AMD_FEATURES_K8_REV_C_EDX
-#define AMD_EXTFEATURES_K8_REV_D_ECX (AMD_EXTFEATURES_K8_REV_C_ECX |\
- __bit(X86_FEATURE_LAHF_LM))
-#define AMD_EXTFEATURES_K8_REV_D_EDX (AMD_EXTFEATURES_K8_REV_C_EDX |\
- __bit(X86_FEATURE_FFXSR))
-
-/* Family 0Fh, Revision E */
-#define AMD_FEATURES_K8_REV_E_ECX (AMD_FEATURES_K8_REV_D_ECX | \
- __bit(X86_FEATURE_XMM3))
-#define AMD_FEATURES_K8_REV_E_EDX (AMD_FEATURES_K8_REV_D_EDX | \
- __bit(X86_FEATURE_HT))
-#define AMD_EXTFEATURES_K8_REV_E_ECX (AMD_EXTFEATURES_K8_REV_D_ECX |\
- __bit(X86_FEATURE_CMP_LEGACY))
-#define AMD_EXTFEATURES_K8_REV_E_EDX AMD_EXTFEATURES_K8_REV_D_EDX
-
-/* Family 0Fh, Revision F */
-#define AMD_FEATURES_K8_REV_F_ECX (AMD_FEATURES_K8_REV_E_ECX | \
- __bit(X86_FEATURE_CX16))
-#define AMD_FEATURES_K8_REV_F_EDX AMD_FEATURES_K8_REV_E_EDX
-#define AMD_EXTFEATURES_K8_REV_F_ECX (AMD_EXTFEATURES_K8_REV_E_ECX |\
- __bit(X86_FEATURE_SVME) | __bit(X86_FEATURE_EXTAPICSPACE) | \
- __bit(X86_FEATURE_ALTMOVCR))
-#define AMD_EXTFEATURES_K8_REV_F_EDX (AMD_EXTFEATURES_K8_REV_E_EDX |\
- __bit(X86_FEATURE_RDTSCP))
-
-/* Family 0Fh, Revision G */
-#define AMD_FEATURES_K8_REV_G_ECX AMD_FEATURES_K8_REV_F_ECX
-#define AMD_FEATURES_K8_REV_G_EDX AMD_FEATURES_K8_REV_F_EDX
-#define AMD_EXTFEATURES_K8_REV_G_ECX (AMD_EXTFEATURES_K8_REV_F_ECX |\
- __bit(X86_FEATURE_3DNOWPF))
-#define AMD_EXTFEATURES_K8_REV_G_EDX AMD_EXTFEATURES_K8_REV_F_EDX
-
-/* Family 10h, Revision B */
-#define AMD_FEATURES_FAM10h_REV_B_ECX (AMD_FEATURES_K8_REV_F_ECX | \
- __bit(X86_FEATURE_POPCNT) | __bit(X86_FEATURE_MWAIT))
-#define AMD_FEATURES_FAM10h_REV_B_EDX AMD_FEATURES_K8_REV_F_EDX
-#define AMD_EXTFEATURES_FAM10h_REV_B_ECX (AMD_EXTFEATURES_K8_REV_F_ECX |\
- __bit(X86_FEATURE_ABM) | __bit(X86_FEATURE_SSE4A) | \
- __bit(X86_FEATURE_MISALIGNSSE) | __bit(X86_FEATURE_OSVW) | \
- __bit(X86_FEATURE_IBS))
-#define AMD_EXTFEATURES_FAM10h_REV_B_EDX (AMD_EXTFEATURES_K8_REV_F_EDX |\
- __bit(X86_FEATURE_PAGE1GB))
-
-/* Family 10h, Revision C */
-#define AMD_FEATURES_FAM10h_REV_C_ECX AMD_FEATURES_FAM10h_REV_B_ECX
-#define AMD_FEATURES_FAM10h_REV_C_EDX AMD_FEATURES_FAM10h_REV_B_EDX
-#define AMD_EXTFEATURES_FAM10h_REV_C_ECX (AMD_EXTFEATURES_FAM10h_REV_B_ECX |\
- __bit(X86_FEATURE_SKINIT) | __bit(X86_FEATURE_WDT))
-#define AMD_EXTFEATURES_FAM10h_REV_C_EDX AMD_EXTFEATURES_FAM10h_REV_B_EDX
-
-/* Family 11h, Revision B */
-#define AMD_FEATURES_FAM11h_REV_B_ECX AMD_FEATURES_K8_REV_G_ECX
-#define AMD_FEATURES_FAM11h_REV_B_EDX AMD_FEATURES_K8_REV_G_EDX
-#define AMD_EXTFEATURES_FAM11h_REV_B_ECX (AMD_EXTFEATURES_K8_REV_G_ECX |\
- __bit(X86_FEATURE_SKINIT))
-#define AMD_EXTFEATURES_FAM11h_REV_B_EDX AMD_EXTFEATURES_K8_REV_G_EDX
-
-#endif /* __AMD_H__ */
diff -r aecf092da748 xen/arch/x86/hvm/svm/asid.c
--- a/xen/arch/x86/hvm/svm/asid.c Wed Jun 30 22:12:54 2010 +0100
+++ b/xen/arch/x86/hvm/svm/asid.c Thu Jul 01 14:01:45 2010 -0500
@@ -21,14 +21,14 @@
#include <xen/lib.h>
#include <xen/perfc.h>
#include <asm/hvm/svm/asid.h>
+#include <asm/amd.h>
void svm_asid_init(struct cpuinfo_x86 *c)
{
int nasids = 0;
/* Check for erratum #170, and leave ASIDs disabled if it's present. */
- if ( (c->x86 == 0x10) ||
- ((c->x86 == 0xf) && (c->x86_model >= 0x68) && (c->x86_mask >= 1)) )
+ if ( !cpu_has_amd_erratum(c, AMD_ERRATUM_170) )
nasids = cpuid_ebx(0x8000000A);
hvm_asid_init(nasids);
diff -r aecf092da748 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c Wed Jun 30 22:12:54 2010 +0100
+++ b/xen/arch/x86/hvm/svm/svm.c Thu Jul 01 14:01:45 2010 -0500
@@ -34,6 +34,7 @@
#include <asm/regs.h>
#include <asm/cpufeature.h>
#include <asm/processor.h>
+#include <asm/amd.h>
#include <asm/types.h>
#include <asm/debugreg.h>
#include <asm/msr.h>
@@ -846,8 +847,8 @@
{
uint64_t msr_content;
- /* only family 10h is affected */
- if ( c->x86 != 0x10 )
+ /* check whether CPU is affected */
+ if ( !cpu_has_amd_erratum(c, AMD_ERRATUM_383) )
return;
/* use safe methods to be compatible with nested virtualization */
diff -r aecf092da748 xen/include/asm-x86/amd.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xen/include/asm-x86/amd.h Thu Jul 01 14:01:45 2010 -0500
@@ -0,0 +1,138 @@
+/*
+ * amd.h - AMD processor specific definitions
+ */
+
+#ifndef __AMD_H__
+#define __AMD_H__
+
+#include <asm/cpufeature.h>
+
+/* CPUID masked for use by AMD-V Extended Migration */
+
+#define X86_FEATURE_BITPOS(_feature_) ((_feature_) % 32)
+#define __bit(_x_) (1U << X86_FEATURE_BITPOS(_x_))
+
+/* Family 0Fh, Revision C */
+#define AMD_FEATURES_K8_REV_C_ECX 0
+#define AMD_FEATURES_K8_REV_C_EDX ( \
+ __bit(X86_FEATURE_FPU) | __bit(X86_FEATURE_VME) | \
+ __bit(X86_FEATURE_DE) | __bit(X86_FEATURE_PSE) | \
+ __bit(X86_FEATURE_TSC) | __bit(X86_FEATURE_MSR) | \
+ __bit(X86_FEATURE_PAE) | __bit(X86_FEATURE_MCE) | \
+ __bit(X86_FEATURE_CX8) | __bit(X86_FEATURE_APIC) | \
+ __bit(X86_FEATURE_SEP) | __bit(X86_FEATURE_MTRR) | \
+ __bit(X86_FEATURE_PGE) | __bit(X86_FEATURE_MCA) | \
+ __bit(X86_FEATURE_CMOV) | __bit(X86_FEATURE_PAT) | \
+ __bit(X86_FEATURE_PSE36) | __bit(X86_FEATURE_CLFLSH)| \
+ __bit(X86_FEATURE_MMX) | __bit(X86_FEATURE_FXSR) | \
+ __bit(X86_FEATURE_XMM) | __bit(X86_FEATURE_XMM2))
+#define AMD_EXTFEATURES_K8_REV_C_ECX 0
+#define AMD_EXTFEATURES_K8_REV_C_EDX (
\
+ __bit(X86_FEATURE_FPU) | __bit(X86_FEATURE_VME) | \
+ __bit(X86_FEATURE_DE) | __bit(X86_FEATURE_PSE) | \
+ __bit(X86_FEATURE_TSC) | __bit(X86_FEATURE_MSR) | \
+ __bit(X86_FEATURE_PAE) | __bit(X86_FEATURE_MCE) | \
+ __bit(X86_FEATURE_CX8) | __bit(X86_FEATURE_APIC) | \
+ __bit(X86_FEATURE_SYSCALL) | __bit(X86_FEATURE_MTRR) | \
+ __bit(X86_FEATURE_PGE) | __bit(X86_FEATURE_MCA) | \
+ __bit(X86_FEATURE_CMOV) | __bit(X86_FEATURE_PAT) | \
+ __bit(X86_FEATURE_PSE36) | __bit(X86_FEATURE_NX) | \
+ __bit(X86_FEATURE_MMXEXT) | __bit(X86_FEATURE_MMX) | \
+ __bit(X86_FEATURE_FXSR) | __bit(X86_FEATURE_LM) | \
+ __bit(X86_FEATURE_3DNOWEXT) | __bit(X86_FEATURE_3DNOW))
+
+/* Family 0Fh, Revision D */
+#define AMD_FEATURES_K8_REV_D_ECX AMD_FEATURES_K8_REV_C_ECX
+#define AMD_FEATURES_K8_REV_D_EDX AMD_FEATURES_K8_REV_C_EDX
+#define AMD_EXTFEATURES_K8_REV_D_ECX (AMD_EXTFEATURES_K8_REV_C_ECX |\
+ __bit(X86_FEATURE_LAHF_LM))
+#define AMD_EXTFEATURES_K8_REV_D_EDX (AMD_EXTFEATURES_K8_REV_C_EDX |\
+ __bit(X86_FEATURE_FFXSR))
+
+/* Family 0Fh, Revision E */
+#define AMD_FEATURES_K8_REV_E_ECX (AMD_FEATURES_K8_REV_D_ECX | \
+ __bit(X86_FEATURE_XMM3))
+#define AMD_FEATURES_K8_REV_E_EDX (AMD_FEATURES_K8_REV_D_EDX | \
+ __bit(X86_FEATURE_HT))
+#define AMD_EXTFEATURES_K8_REV_E_ECX (AMD_EXTFEATURES_K8_REV_D_ECX |\
+ __bit(X86_FEATURE_CMP_LEGACY))
+#define AMD_EXTFEATURES_K8_REV_E_EDX AMD_EXTFEATURES_K8_REV_D_EDX
+
+/* Family 0Fh, Revision F */
+#define AMD_FEATURES_K8_REV_F_ECX (AMD_FEATURES_K8_REV_E_ECX | \
+ __bit(X86_FEATURE_CX16))
+#define AMD_FEATURES_K8_REV_F_EDX AMD_FEATURES_K8_REV_E_EDX
+#define AMD_EXTFEATURES_K8_REV_F_ECX (AMD_EXTFEATURES_K8_REV_E_ECX |\
+ __bit(X86_FEATURE_SVME) | __bit(X86_FEATURE_EXTAPICSPACE) | \
+ __bit(X86_FEATURE_ALTMOVCR))
+#define AMD_EXTFEATURES_K8_REV_F_EDX (AMD_EXTFEATURES_K8_REV_E_EDX |\
+ __bit(X86_FEATURE_RDTSCP))
+
+/* Family 0Fh, Revision G */
+#define AMD_FEATURES_K8_REV_G_ECX AMD_FEATURES_K8_REV_F_ECX
+#define AMD_FEATURES_K8_REV_G_EDX AMD_FEATURES_K8_REV_F_EDX
+#define AMD_EXTFEATURES_K8_REV_G_ECX (AMD_EXTFEATURES_K8_REV_F_ECX |\
+ __bit(X86_FEATURE_3DNOWPF))
+#define AMD_EXTFEATURES_K8_REV_G_EDX AMD_EXTFEATURES_K8_REV_F_EDX
+
+/* Family 10h, Revision B */
+#define AMD_FEATURES_FAM10h_REV_B_ECX (AMD_FEATURES_K8_REV_F_ECX | \
+ __bit(X86_FEATURE_POPCNT) | __bit(X86_FEATURE_MWAIT))
+#define AMD_FEATURES_FAM10h_REV_B_EDX AMD_FEATURES_K8_REV_F_EDX
+#define AMD_EXTFEATURES_FAM10h_REV_B_ECX (AMD_EXTFEATURES_K8_REV_F_ECX |\
+ __bit(X86_FEATURE_ABM) | __bit(X86_FEATURE_SSE4A) | \
+ __bit(X86_FEATURE_MISALIGNSSE) | __bit(X86_FEATURE_OSVW) | \
+ __bit(X86_FEATURE_IBS))
+#define AMD_EXTFEATURES_FAM10h_REV_B_EDX (AMD_EXTFEATURES_K8_REV_F_EDX |\
+ __bit(X86_FEATURE_PAGE1GB))
+
+/* Family 10h, Revision C */
+#define AMD_FEATURES_FAM10h_REV_C_ECX AMD_FEATURES_FAM10h_REV_B_ECX
+#define AMD_FEATURES_FAM10h_REV_C_EDX AMD_FEATURES_FAM10h_REV_B_EDX
+#define AMD_EXTFEATURES_FAM10h_REV_C_ECX (AMD_EXTFEATURES_FAM10h_REV_B_ECX |\
+ __bit(X86_FEATURE_SKINIT) | __bit(X86_FEATURE_WDT))
+#define AMD_EXTFEATURES_FAM10h_REV_C_EDX AMD_EXTFEATURES_FAM10h_REV_B_EDX
+
+/* Family 11h, Revision B */
+#define AMD_FEATURES_FAM11h_REV_B_ECX AMD_FEATURES_K8_REV_G_ECX
+#define AMD_FEATURES_FAM11h_REV_B_EDX AMD_FEATURES_K8_REV_G_EDX
+#define AMD_EXTFEATURES_FAM11h_REV_B_ECX (AMD_EXTFEATURES_K8_REV_G_ECX |\
+ __bit(X86_FEATURE_SKINIT))
+#define AMD_EXTFEATURES_FAM11h_REV_B_EDX AMD_EXTFEATURES_K8_REV_G_EDX
+
+/* AMD errata checking
+ *
+ * Errata are defined using the AMD_LEGACY_ERRATUM() or AMD_OSVW_ERRATUM()
+ * macros. The latter is intended for newer errata that have an OSVW id
+ * assigned, which it takes as first argument. Both take a variable number
+ * of family-specific model-stepping ranges created by AMD_MODEL_RANGE().
+ *
+ * Example 1:
+ * #define AMD_ERRATUM_319 \
+ * AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2), \
+ * AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0), \
+ * AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0))
+ * Example 2:
+ * #define AMD_ERRATUM_400 \
+ * AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf), \
+ * AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf))
+ *
+ */
+
+#define AMD_LEGACY_ERRATUM(...) 0 /* legacy */, __VA_ARGS__, 0
+#define AMD_OSVW_ERRATUM(osvw_id, ...) 1 /* osvw */, osvw_id, __VA_ARGS__, 0
+#define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
+ ((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
+#define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff)
+#define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff)
+#define AMD_MODEL_RANGE_END(range) ((range) & 0xfff)
+
+#define AMD_ERRATUM_170 \
+ AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x0f, 0x0, 0x0, 0x67, 0xf))
+
+#define AMD_ERRATUM_383 \
+ AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf), \
+ AMD_MODEL_RANGE(0x12, 0x0, 0x0, 0x1, 0x0))
+
+int cpu_has_amd_erratum(const struct cpuinfo_x86 *, int, ...);
+#endif /* __AMD_H__ */
diff -r aecf092da748 xen/include/asm-x86/msr-index.h
--- a/xen/include/asm-x86/msr-index.h Wed Jun 30 22:12:54 2010 +0100
+++ b/xen/include/asm-x86/msr-index.h Thu Jul 01 14:01:45 2010 -0500
@@ -252,6 +252,10 @@
#define MSR_AMD_PATCHLEVEL 0x0000008b
#define MSR_AMD_PATCHLOADER 0xc0010020
+/* AMD OS Visible Workaround MSRs */
+#define MSR_AMD_OSVW_ID_LENGTH 0xc0010140
+#define MSR_AMD_OSVW_STATUS 0xc0010141
+
/* K6 MSRs */
#define MSR_K6_EFER 0xc0000080
#define MSR_K6_STAR 0xc0000081
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