[Xen-devel] [v4 02/17] Add helper macro for X86_FEATURE_CX16 feature detection

[Feng Wu <feng.wu@xxxxxxxxx>]

Add macro cpu_has_cx16 to detect X86_FEATURE_CX16 feature.

CC: Keir Fraser <keir@xxxxxxx>
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
v4:
- no changes

v3:
- Newly added. We need to atomically update the IRTE in PI format
  via CMPXCHG16B which is only available with this feature.

 xen/include/asm-x86/cpufeature.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/include/asm-x86/cpufeature.h b/xen/include/asm-x86/cpufeature.h
index 7963a3a..63c1fe8 100644
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -216,6 +216,8 @@
 
 #define cpu_has_cpuid_faulting boot_cpu_has(X86_FEATURE_CPUID_FAULTING)
 
+#define cpu_has_cx16            boot_cpu_has(X86_FEATURE_CX16)
+
 enum _cache_type {
     CACHE_TYPE_NULL = 0,
     CACHE_TYPE_DATA = 1,
-- 
2.1.0


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