[RFC] Why KVM don't support last branch recording for intel CPUs?

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Hi all,

XEN supported last branch recording(LBR) since 2007. 
And KVM has supported vPMU, but hasn't support LBR for intel CPUs yet. 
May I ask why? Is there any considerations to implement it? Thanks.

PS: I tried to google some reasons about this, but I got nothing.  :(

Regards,
-Gonglei


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