[Xen-changelog] [xen-unstable] x86: Expose TSC adjust to HVM guest

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Liu, Jinsong <jinsong.liu@xxxxxxxxx>
# Date 1348654470 -7200
# Node ID 3aa66543a51ba77cb73e8c874e2416d065426a22
# Parent  56fb977ce6eb4626a02d4a7a34e85009bb8ee3e0
x86: Expose TSC adjust to HVM guest

Intel latest SDM (17.13.3) release a new MSR CPUID.7.0.EBX[1]=1
indicates TSC_ADJUST MSR 0x3b is supported.

This patch expose it to hvm guest.

Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx>
Committed-by: Jan Beulich <jbeulich@xxxxxxxx>
---


diff -r 56fb977ce6eb -r 3aa66543a51b tools/libxc/xc_cpufeature.h
--- a/tools/libxc/xc_cpufeature.h       Wed Sep 26 12:13:38 2012 +0200
+++ b/tools/libxc/xc_cpufeature.h       Wed Sep 26 12:14:30 2012 +0200
@@ -128,6 +128,7 @@
 
 /* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx) */
 #define X86_FEATURE_FSGSBASE     0 /* {RD,WR}{FS,GS}BASE instructions */
+#define X86_FEATURE_TSC_ADJUST   1 /* Tsc thread offset */
 #define X86_FEATURE_BMI1         3 /* 1st group bit manipulation extensions */
 #define X86_FEATURE_HLE          4 /* Hardware Lock Elision */
 #define X86_FEATURE_AVX2         5 /* AVX2 instructions */
diff -r 56fb977ce6eb -r 3aa66543a51b tools/libxc/xc_cpuid_x86.c
--- a/tools/libxc/xc_cpuid_x86.c        Wed Sep 26 12:13:38 2012 +0200
+++ b/tools/libxc/xc_cpuid_x86.c        Wed Sep 26 12:14:30 2012 +0200
@@ -362,7 +362,8 @@ static void xc_cpuid_hvm_policy(
 
     case 0x00000007: /* Intel-defined CPU features */
         if ( input[1] == 0 ) {
-            regs[1] &= (bitmaskof(X86_FEATURE_BMI1) |
+            regs[1] &= (bitmaskof(X86_FEATURE_TSC_ADJUST) |
+                        bitmaskof(X86_FEATURE_BMI1) |
                         bitmaskof(X86_FEATURE_HLE)  |
                         bitmaskof(X86_FEATURE_AVX2) |
                         bitmaskof(X86_FEATURE_SMEP) |

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