[Xen-devel] [PATCH] x86/faulting: Use formal defines instead of opencoded bits

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Keir Fraser <keir@xxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/cpu/intel.c        |    7 ++++---
 xen/include/asm-x86/msr-index.h |    5 +++++
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/cpu/intel.c b/xen/arch/x86/cpu/intel.c
index 27fe762..808ed8d 100644
--- a/xen/arch/x86/cpu/intel.c
+++ b/xen/arch/x86/cpu/intel.c
@@ -21,7 +21,8 @@
 static unsigned int probe_intel_cpuid_faulting(void)
 {
        uint64_t x;
-       return !rdmsr_safe(MSR_INTEL_PLATFORM_INFO, x) && (x & (1u<<31));
+       return !rdmsr_safe(MSR_INTEL_PLATFORM_INFO, x) &&
+            (x & PLATFORM_INFO_CPUID_FAULTING);
 }
 
 static DEFINE_PER_CPU(bool_t, cpuid_faulting_enabled);
@@ -34,9 +35,9 @@ void set_cpuid_faulting(bool_t enable)
                return;
 
        rdmsr(MSR_INTEL_MISC_FEATURES_ENABLES, lo, hi);
-       lo &= ~1;
+       lo &= ~MISC_FEATURES_CPUID_FAULTING;
        if (enable)
-               lo |= 1;
+               lo |= MISC_FEATURES_CPUID_FAULTING;
        wrmsr(MSR_INTEL_MISC_FEATURES_ENABLES, lo, hi);
 
        this_cpu(cpuid_faulting_enabled) = enable;
diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index 86b7d64..15a7e13 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -486,7 +486,12 @@
 
 /* Intel cpuid faulting MSRs */
 #define MSR_INTEL_PLATFORM_INFO                0x000000ce
+#define _PLATFORM_INFO_CPUID_FAULTING  31
+#define PLATFORM_INFO_CPUID_FAULTING   (1ULL << _PLATFORM_INFO_CPUID_FAULTING)
+
 #define MSR_INTEL_MISC_FEATURES_ENABLES        0x00000140
+#define _MISC_FEATURES_CPUID_FAULTING  0
+#define MISC_FEATURES_CPUID_FAULTING   (1ULL << _MISC_FEATURES_CPUID_FAULTING)
 
 /* Geode defined MSRs */
 #define MSR_GEODE_BUSCONT_CONF0                0x00001900
-- 
1.7.10.4


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