From a9221dd5ec125fbec1702fae016c6d2ea1a9a3da Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@redhat.com>
Date: Sun, 6 Jun 2010 14:48:06 +0300
Subject: [PATCH] KVM: MMU: Atomically check for accessed bit when dropping an
 spte

Currently, in the window between the check for the accessed bit, and actually
dropping the spte, a vcpu can access the page through the spte and set the bit,
which will be ignored by the mmu.

Fix by using an exchange operation to atmoically fetch the spte and drop it.

Signed-off-by: Avi Kivity <avi@redhat.com>
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