[Xen-changelog] [xen stable-4.5] x86: move cached CR4 value to struct cpu_info

[patchbot@xxxxxxx]

commit c790220d0799ad64864ae4311050079952a4c3c4
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri May 27 14:45:36 2016 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri May 27 14:45:36 2016 +0200

    x86: move cached CR4 value to struct cpu_info
    
    This not only eases using the cached value in assembly code, but also
    improves the generated code resulting from such reads in C.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 5d93f1d8ca7b62e85c8b98ed9c45b6cef89d17b8
    master date: 2016-03-18 09:49:47 +0100
---
 xen/arch/x86/domain.c           | 1 -
 xen/arch/x86/setup.c            | 2 +-
 xen/include/asm-x86/current.h   | 2 +-
 xen/include/asm-x86/processor.h | 6 ++----
 4 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 2d2dece..b1d46c0 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -64,7 +64,6 @@
 #include <asm/psr.h>
 
 DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
-DEFINE_PER_CPU(unsigned long, cr4);
 
 static void default_idle(void);
 void (*pm_idle) (void) __read_mostly = default_idle;
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index ff608fd..2828c71 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -590,7 +590,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
     if ( cpu_has_efer )
         rdmsrl(MSR_EFER, this_cpu(efer));
-    asm volatile ( "mov %%cr4,%0" : "=r" (this_cpu(cr4)) );
+    asm volatile ( "mov %%cr4,%0" : "=r" (get_cpu_info()->cr4) );
 
     /* We initialise the serial devices very early so we can get debugging. */
     ns16550.io_base = 0x3f8;
diff --git a/xen/include/asm-x86/current.h b/xen/include/asm-x86/current.h
index b95fd79..b25c83d 100644
--- a/xen/include/asm-x86/current.h
+++ b/xen/include/asm-x86/current.h
@@ -19,8 +19,8 @@ struct cpu_info {
     unsigned int processor_id;
     struct vcpu *current_vcpu;
     unsigned long per_cpu_offset;
+    unsigned long cr4;
     /* get_stack_bottom() must be 16-byte aligned */
-    unsigned long __pad_for_stack_bottom;
 };
 
 static inline struct cpu_info *get_cpu_info(void)
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index 56fc5a2..3cf8b2f 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -314,16 +314,14 @@ static inline unsigned long read_cr2(void)
     return cr2;
 }
 
-DECLARE_PER_CPU(unsigned long, cr4);
-
 static inline unsigned long read_cr4(void)
 {
-    return this_cpu(cr4);
+    return get_cpu_info()->cr4;
 }
 
 static inline void write_cr4(unsigned long val)
 {
-    this_cpu(cr4) = val;
+    get_cpu_info()->cr4 = val;
     asm volatile ( "mov %0,%%cr4" : : "r" (val) );
 }
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.5

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