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/wakeirq-drivers-v2^2~2^2~71^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0be0226f07d14b153a5eedf2bb86e1eb7dcefab5;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>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

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