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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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