ECX is initialized to 0 in case the highest CPUID leaf has
sub-functions (as is the case for 0xD on processors with XSAVE).
However, this was only happening in the big real mode case due
to a typo in the asm constraint.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
x86/realmode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/x86/realmode.c b/x86/realmode.c
index 1d92a86..740f8ff 100644
--- a/x86/realmode.c
+++ b/x86/realmode.c
@@ -1388,7 +1388,7 @@ static void test_cpuid(void)
inregs.eax = eax = function;
inregs.ecx = ecx = 0;
- asm("cpuid" : "+a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx));
+ asm("cpuid" : "+a"(eax), "=b"(ebx), "+c"(ecx), "=d"(edx));
exec_in_big_real_mode(&insn_cpuid);
report("cpuid", R_AX|R_BX|R_CX|R_DX,
outregs.eax == eax && outregs.ebx == ebx
--
1.8.3.1
--
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