[Xen-devel] [PATCH] fix rdmsrl() truncation bug

[Avi Kivity <avi@xxxxxxxxxxxx>]

rdmsrl() shifts an unsigned long by 32 bits, which on x86_32 results in 
the data being discarded. patch fixes that by casting to __u64 before 
the shift.
Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>

diff -r 829517be689f xen/include/asm-x86/msr.h
--- a/xen/include/asm-x86/msr.h Fri Dec 23 15:42:46 2005
+++ b/xen/include/asm-x86/msr.h Tue Dec 27 19:02:09 2005
@@ -12,7 +12,7 @@
       __asm__ __volatile__("rdmsr" \
                            : "=a" (a__), "=d" (b__) \
                            : "c" (msr)); \
-       val = a__ | (b__<<32); \
+       val = a__ | ((__u64)b__<<32); \
} while(0); 

#define wrmsr(msr,val1,val2) \




--
error compiling committee.c: too many arguments to function


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