[PATCH v1 1/4] Add R3MWAIT register and bit to msr-info.h

From: Grzegorz Andrejczuk
Date: Wed Oct 12 2016 - 06:14:41 EST


Intel Xeon Phi x200 (codenamed Knights Landing) has MSR
MISC_THD_FEATURE_ENABLE 0x140.

Setting its 2nd bit make MONITOR and MWAIT instructions do not cause
invalid-opcode exception.

This commit adds this register prefixed by PHI and bit to msr-info.h
Reference:
https://software.intel.com/en-us/blogs/2016/10/06/intel-xeon-phi-product-family-x200-knl-user-mode-ring-3-monitor-and-mwait

Change-Id: If3b14c78f4e66d734e5a00921023a8c7cafc0cf3
Signed-off-by: Grzegorz Andrejczuk <grzegorz.andrejczuk@xxxxxxxxx>
---
arch/x86/include/asm/msr-index.h | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 56f4c66..3eb1713 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -540,6 +540,11 @@
#define MSR_IA32_MISC_ENABLE_IP_PREF_DISABLE_BIT 39
#define MSR_IA32_MISC_ENABLE_IP_PREF_DISABLE (1ULL << MSR_IA32_MISC_ENABLE_IP_PREF_DISABLE_BIT)

+/* Intel Xeon Phi x200 ring 3 MONITOR/MWAIT */
+#define MSR_PHI_MISC_THD_FEATURE_ENABLE 0x00000140
+#define MSR_PHI_MISC_THD_FEATURE_ENABLE_R3MWAIT_BIT 1
+#define MSR_PHI_MISC_THD_FEATURE_ENABLE_R3MWAIT (1ULL << MSR_PHI_MISC_THD_FEATURE_ENABLE_R3MWAIT_BIT)
+
#define MSR_IA32_TSC_DEADLINE 0x000006E0

/* P4/Xeon+ specific */
--
2.5.1