Re: [PATCH 0/3] x86: enlightenment for ticket spinlocks

From: Jan Beulich
Date: Sun Jan 31 2010 - 13:02:51 EST

>>> "H. Peter Anvin" 01/31/10 2:42 AM >>>
>+ * EBX-EDX: "XenVMMXenVMM" signature, allowing positive identification
>+ * of a Xen host.
>+ */
>+#define XEN_CPUID_SIGNATURE_EBX 0x566e6558 /* "XenV" */
>+#define XEN_CPUID_SIGNATURE_ECX 0x65584d4d /* "MMXe" */
>+#define XEN_CPUID_SIGNATURE_EDX 0x4d4d566e /* "nVMM" */
>I hope you know this spells "MMXenVMMXenV". The ordering is ecx-edx-ebx
>(register numbers 1, 2, 3).

According to the documentation I have, the ordering is EBX-EDX-ECX,
so indeed the spelling would seem broken, but since this is an interface
header taken directly from Xen, it's got to be (and it works) that way.


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