[Xen-devel] [PATCH 4/5][RFC] lwp: adding support for AMD lightweight profiling

[Wei Huang <wei.huang2@xxxxxxx>]

Add xsave/xrstor support for LWP

Because 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>

Attachment: lwp_patch_4.txt
Description: lwp_patch_4.txt

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