[xen master] x86/mwait-idle: fix ubsan warning

[patchbot@xxxxxxx]

commit 2467ab2a74463107132f7d929d2ff0e30a8b6fa3
Author:     Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>
AuthorDate: Mon Jan 8 10:16:58 2024 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jan 8 10:16:58 2024 +0100

    x86/mwait-idle: fix ubsan warning
    
    Fix warning:
    (XEN) UBSAN: Undefined behaviour in arch/x86/cpu/mwait-idle.c:1300:44
    (XEN) left shift of 15 by 28 places cannot be represented in type 'int'
    originating from sklh_idle_state_table_update() and hence observable on
    one kind of CPU only.
    
    Fixes: 5a211704e88 ("mwait-idle: prevent SKL-H boot failure when C8+C9+C10 
enabled")
    Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/include/asm/mwait.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/include/asm/mwait.h b/xen/arch/x86/include/asm/mwait.h
index f377d9fdca..9298f987c4 100644
--- a/xen/arch/x86/include/asm/mwait.h
+++ b/xen/arch/x86/include/asm/mwait.h
@@ -4,7 +4,7 @@
 #include <xen/types.h>
 
 #define MWAIT_SUBSTATE_MASK            0xf
-#define MWAIT_CSTATE_MASK              0xf
+#define MWAIT_CSTATE_MASK              0xfU
 #define MWAIT_SUBSTATE_SIZE            4
 
 #define CPUID_MWAIT_LEAF               5
--
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