[Xen-changelog] [xen stable-4.8] x86/msr: Correct the definition of MSR_IA32_APICBASE_BASE

[patchbot@xxxxxxx]

commit 379213ca254a316430d7a96148e24683ecc12fd4
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Tue Oct 24 16:24:48 2017 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Oct 24 16:24:48 2017 +0200

    x86/msr: Correct the definition of MSR_IA32_APICBASE_BASE
    
    0xfffff << 12 is undefined behaviour, due to shifting into the sign bit of 
an
    integer.
    
    Spotted by the Undefined Behaviour Sanitiser
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
    master commit: dbc4b6e13a5d0dd8967cde7ff7000ab1ed88625e
    master date: 2017-10-03 17:45:24 +0100
---
 xen/include/asm-x86/msr-index.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index 98dbff1..4f3f8d5 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -301,7 +301,7 @@
 #define MSR_IA32_APICBASE_BSP          (1<<8)
 #define MSR_IA32_APICBASE_EXTD         (1<<10)
 #define MSR_IA32_APICBASE_ENABLE       (1<<11)
-#define MSR_IA32_APICBASE_BASE         (0xfffff<<12)
+#define MSR_IA32_APICBASE_BASE         0x000ffffffffff000ul
 #define MSR_IA32_APICBASE_MSR           0x800
 #define MSR_IA32_APICTPR_MSR            0x808
 #define MSR_IA32_APICPPR_MSR            0x80a
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.8

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
https://lists.xenproject.org/xen-changelog