[Xen-devel] [PATCH] x86: properly gate clearing of PKU feature

[Jan Beulich <jbeulich@xxxxxxxx>]

setup_clear_cpu_cap() is __init and hence may not be called post-boot.
Note that opt_pku nevertheless is not getting __initdata added - see
e.g. commit 43fa95ae6a ("mm: make opt_bootscrub non-init").

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

--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -466,7 +466,7 @@ void identify_cpu(struct cpuinfo_x86 *c)
                this_cpu->c_init(c);
 
 
-       if ( !opt_pku )
+       if (c == &boot_cpu_data && !opt_pku)
                setup_clear_cpu_cap(X86_FEATURE_PKU);
 
        /*

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