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[Xen-devel] [PATCH 4/5][RFC] lwp: adding support for AMD lightweight pro
| To: | "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxx> |
|---|---|
| Subject: | [Xen-devel] [PATCH 4/5][RFC] lwp: adding support for AMD lightweight profiling |
| From: | Wei Huang <wei.huang2@xxxxxxx> |
| Date: | Fri, 11 Feb 2011 10:29:13 -0600 |
| Cc: | "Wei, Gang" <gang.wei@xxxxxxxxx> |
| Delivery-date: | Fri, 11 Feb 2011 08:46:44 -0800 |
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Add xsave/xrstor support for LWPBecause LWP is not tracked by TS, which is used in current xsave/xrstor implementation for FPU/AVX. As a result, we have to save and restore LWP in extended area whenever vcpu is re-scheduled. To avoid unnecessary lwp save/restore, this patch checks the LWP_CBADDR to determine whether LWP has been turned on. Signed-off-by: Wei Huang <wei.huang2@xxxxxxx>
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