From: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Date: Mon, 11 May 2015 14:55:21 +0000 (+0800)
Subject: KVM: MMU: fix SMAP virtualization
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~138^2~80
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=edc90b7dc4ceef62ef0ad9cc6c3f5dc770e83ad2;p=pandora-kernel.git

KVM: MMU: fix SMAP virtualization

KVM may turn a user page to a kernel page when kernel writes a readonly
user page if CR0.WP = 1. This shadow page entry will be reused after
SMAP is enabled so that kernel is allowed to access this user page

Fix it by setting SMAP && !CR0.WP into shadow page's role and reset mmu
once CR4.SMAP is updated

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