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Date: Sun, 31 Jan 2010 10:43:39 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Jan Beulich <jbeulich@...ell.com> CC: mingo@...e.hu, jeremy@...p.org, tglx@...utronix.de, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/3] x86: enlightenment for ticket spinlocks On 01/31/2010 10:02 AM, Jan Beulich wrote: >>>> "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. > Odd. > It's probably a bug that's now cast in stone. That happends. I just had to be picky. (And yes, it's ebx-edx-ecx; see my second email.) -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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