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Date:   Mon, 20 Feb 2017 17:02:53 -0500 (EST)
From:   Paolo Bonzini <>
To:     Andy Lutomirski <>
Cc:     kvm list <>,,
        X86 ML <>, "H. Peter Anvin" <>,
        Borislav Petkov <>
Subject: Re: RFC: Getting rid of LTR in VMX

> > Yes.  But 150-200 clock cycles are nothing compared to the cache misses
> > you get from preemption, so I'd ignore that.  Saving 300 clock cycles on
> > userspace exits from TR+GSBASE would be about 5% on my Haswell.
> That's still 5% :)

Yes, 5% on userspace exits is good (though they're rare).

OTOH, 300 clock cycles on preemption are nothing to write home about.


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