From 7cbeed9bce7580479bb97457dad220cb3594b875 Mon Sep 17 00:00:00 2001
From: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Date: Thu, 7 May 2015 16:20:15 +0800
Subject: [PATCH] KVM: MMU: fix smap permission check

Current permission check assumes that RSVD bit in PFEC is always zero,
however, it is not true since MMIO #PF will use it to quickly identify
MMIO access

Fix it by clearing the bit if walking guest page table is needed

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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