From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <ak@linux.intel.com>
Subject: Re: [patch 2/5] KVM: MMU: allow pinning spte translations (TDP-only)
Date: Thu, 19 Jun 2014 07:06:58 -0700
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To: Avi Kivity <avi.kivity@gmail.com>
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> >+ * Failure to instantiate pages will abort guest entry.
> >+ *
> >+ * Page frames should be pinned with get_page in advance.
> >+ *
> >+ * Pinning is not guaranteed while executing as L2 guest.
> 
> Does this undermine security?

It should not. In the worst case it'll randomly lose PEBS records.

-Andi