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

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Message-ID: <4B64E0D2.3000004@zytor.com>
Date:	Sat, 30 Jan 2010 17:45:54 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	mingo@...e.hu, tglx@...utronix.de,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] x86: enlightenment for ticket spinlocks

On 01/30/2010 05:42 PM, H. Peter Anvin wrote:
> 
> + * 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).
> 

... and of course I got it wrong, too.  It spells "XenVnVMMMMXe".

The proper order is ebx-edx-ecx, in *reverse* numerical order.
Confusing, yes.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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