From: "H. Peter Anvin" <hpa@zytor.com>
To: Jan Beulich <JBeulich@novell.com>
Cc: mingo@elte.hu, tglx@linutronix.de,
Jeremy Fitzhardinge <jeremy@goop.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] x86: enlightenment for ticket spinlocks
Date: Sat, 30 Jan 2010 17:45:54 -0800 [thread overview]
Message-ID: <4B64E0D2.3000004@zytor.com> (raw)
In-Reply-To: <4B64E000.3020608@zytor.com>
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.
next prev parent reply other threads:[~2010-01-31 1:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-29 8:00 [PATCH 0/3] x86: enlightenment for ticket spinlocks Jan Beulich
2010-01-31 1:42 ` H. Peter Anvin
2010-01-31 1:45 ` H. Peter Anvin [this message]
-- strict thread matches above, loose matches on Subject: below --
2010-01-31 18:02 Jan Beulich
2010-01-31 18:43 ` H. Peter Anvin
2010-02-01 7:56 ` Jan Beulich
2010-02-01 16:40 ` H. Peter Anvin
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