[Xen-changelog] [xen stable-4.12] x86: properly gate clearing of PKU feature

[patchbot@xxxxxxx]

commit 2b84ade58435ab8c0f6608576176a54ba6151ae6
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Sep 23 14:24:33 2019 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Sep 23 14:24:33 2019 +0200

    x86: properly gate clearing of PKU feature
    
    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>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 41c7700a00011ad08be3c9d71126b67e08e58ac3
    master date: 2019-08-29 15:10:07 +0200
---
 xen/arch/x86/cpu/common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/cpu/common.c b/xen/arch/x86/cpu/common.c
index 1eaea16e5b..851c23ddc5 100644
--- a/xen/arch/x86/cpu/common.c
+++ b/xen/arch/x86/cpu/common.c
@@ -464,7 +464,7 @@ 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);
 
        /*
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.12

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