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[PATCH v2 05/15] x86: amend cpu_has_xen_[ibt,shstk}


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Fri, 24 Nov 2023 09:38:55 +0100
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  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Fri, 24 Nov 2023 08:39:02 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

... to evaluate to false at compile-time when the respective Kconfig
control is off, thus allowing the compiler to eliminate then-dead code.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: New.

--- a/xen/arch/x86/include/asm/cpufeature.h
+++ b/xen/arch/x86/include/asm/cpufeature.h
@@ -215,8 +215,10 @@ static inline bool boot_cpu_has(unsigned
 #define cpu_has_lfence_dispatch boot_cpu_has(X86_FEATURE_LFENCE_DISPATCH)
 #define cpu_has_nscb            boot_cpu_has(X86_FEATURE_NSCB)
 #define cpu_has_xen_lbr         boot_cpu_has(X86_FEATURE_XEN_LBR)
-#define cpu_has_xen_shstk       boot_cpu_has(X86_FEATURE_XEN_SHSTK)
-#define cpu_has_xen_ibt         boot_cpu_has(X86_FEATURE_XEN_IBT)
+#define cpu_has_xen_shstk       (IS_ENABLED(CONFIG_XEN_SHSTK) && \
+                                 boot_cpu_has(X86_FEATURE_XEN_SHSTK))
+#define cpu_has_xen_ibt         (IS_ENABLED(CONFIG_XEN_IBT) && \
+                                 boot_cpu_has(X86_FEATURE_XEN_IBT))
 
 #define cpu_has_msr_tsc_aux     (cpu_has_rdtscp || cpu_has_rdpid)
 




 


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