From: Marcelo Tosatti <marcelo@kvack.org>
Date: Wed, 12 Dec 2007 00:12:27 +0000 (-0500)
Subject: KVM: MMU: Fix SMP shadow instantiation race
X-Git-Tag: v2.6.25-rc1~1138^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7819026eefee53eaaac3fdce1a2f157c7ea943fe;p=pandora-kernel.git

KVM: MMU: Fix SMP shadow instantiation race

There is a race where VCPU0 is shadowing a pagetable entry while VCPU1
is updating it, which results in a stale shadow copy.

Fix that by comparing the contents of the cached guest pte with the
current guest pte after write-protecting the guest pagetable.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---

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