[Xen-devel] [PATCH V2] Add CPUID bit mask for Performance Counter Extension

[<suravee.suthikulpanit@xxxxxxx>]

Adding CPUID bit mask for Performance Counter Extension. The extended 
counter MSRs are already virtualized.  This bit mask allows the initialization 
code to properly detect the feature and enable the use of counters.

Signed-off-by: Jacob Shin <Jacob.Shin@xxxxxxx>
Submitted-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
Changelog:
V2:
    * Add commit log message

 tools/libxc/xc_cpufeature.h |    1 +
 tools/libxc/xc_cpuid_x86.c  |    1 +
 tools/libxl/libxl_cpuid.c   |    1 +
 3 files changed, 3 insertions(+)

diff --git a/tools/libxc/xc_cpufeature.h b/tools/libxc/xc_cpufeature.h
index c464e3a..c804af3 100644
--- a/tools/libxc/xc_cpufeature.h
+++ b/tools/libxc/xc_cpufeature.h
@@ -125,6 +125,7 @@
 #define X86_FEATURE_NODEID_MSR  19 /* NodeId MSR */
 #define X86_FEATURE_TBM         21 /* trailing bit manipulations */
 #define X86_FEATURE_TOPOEXT     22 /* topology extensions CPUID leafs */
+#define X86_FEATURE_PERFCTR_CORE 23 /* core performance counter extensions */
 
 /* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx) */
 #define X86_FEATURE_FSGSBASE     0 /* {RD,WR}{FS,GS}BASE instructions */
diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
index 17efc0f..c269468 100644
--- a/tools/libxc/xc_cpuid_x86.c
+++ b/tools/libxc/xc_cpuid_x86.c
@@ -112,6 +112,7 @@ static void amd_xc_cpuid_policy(
                     bitmaskof(X86_FEATURE_XOP) |
                     bitmaskof(X86_FEATURE_FMA4) |
                     bitmaskof(X86_FEATURE_TBM) |
+                    bitmaskof(X86_FEATURE_PERFCTR_CORE) |
                     bitmaskof(X86_FEATURE_LWP));
         regs[3] &= (0x0183f3ff | /* features shared with 0x00000001:EDX */
                     (is_pae ? bitmaskof(X86_FEATURE_NX) : 0) |
diff --git a/tools/libxl/libxl_cpuid.c b/tools/libxl/libxl_cpuid.c
index d17fdd6..f3f1265 100644
--- a/tools/libxl/libxl_cpuid.c
+++ b/tools/libxl/libxl_cpuid.c
@@ -147,6 +147,7 @@ int libxl_cpuid_parse_config(libxl_cpuid_policy_list 
*cpuid, const char* str)
         {"vme",          0x00000001, NA, CPUID_REG_EDX,  1,  1},
         {"fpu",          0x00000001, NA, CPUID_REG_EDX,  0,  1},
         {"topoext",      0x80000001, NA, CPUID_REG_ECX, 22,  1},
+        {"perfctr_core", 0x80000001, NA, CPUID_REG_ECX, 23,  1},
         {"tbm",          0x80000001, NA, CPUID_REG_ECX, 21,  1},
         {"nodeid",       0x80000001, NA, CPUID_REG_ECX, 19,  1},
         {"fma4",         0x80000001, NA, CPUID_REG_ECX, 16,  1},
-- 
1.7.10.4



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