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[Xen-devel] [PATCH] x86: use cpuid vector 0xb when available for detect
| To: | Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH] x86: use cpuid vector 0xb when available for detecting cpu topology |
| From: | "Han, Weidong" <weidong.han@xxxxxxxxx> |
| Date: | Fri, 16 Jul 2010 16:13:56 +0800 |
| Accept-language: | en-US |
| Acceptlanguage: | en-US |
| Cc: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Delivery-date: | Fri, 16 Jul 2010 01:15:13 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] x86: use cpuid vector 0xb when available for detecting cpu topology |
(Most code is ported from Linux kernel.) cpuid leaf 0xb provides extended topology enumeration. This interface provides the 32-bit x2APIC id of the logical processor and it also provides a new mechanism to detect SMT and core siblings (which provides increased addressability). Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
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