On 11/16/2009 01:17 PM, Dietmar Maurer wrote:
38f0: 0f 85 82 01 00 00 jne 3a78<svm_get_msr+0x2b8>
38f6: 48 8b 87 e0 27 00 00 mov 0x27e0(%rdi),%rax
38fd: 48 8b 48 50 mov 0x50(%rax),%rcx
3901: 0f 31 rdtsc
3903: 48 01 c8 add %rcx,%rax
# this is svm_get_msr+0x146
3906: 48 89 02 mov %rax,(%rdx)
Looks like a miscompile of native_read_tsc(), it needs to use %edx:%eax,
not assume the result is in %rax.
Jan, looks like the culprit is
static inline unsigned long long kvm_native_read_tsc(void)
{
unsigned long long val;
asm volatile("rdtsc" : "=A" (val));
return val;
}
"=A" only works correctly on i386, need to use "=a" "=d" for portability.
--
error compiling committee.c: too many arguments to function
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