From: Nadav Amit <namit@cs.technion.ac.il>
Date: Tue, 30 Sep 2014 17:49:14 +0000 (+0300)
Subject: KVM: x86: DR7.GD should be cleared upon any #DB exception
X-Git-Tag: omap-for-v3.19/fixes-rc1~43^2~108
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6bdf06625d240361e92254143a123ab432e337f8;p=pandora-kernel.git

KVM: x86: DR7.GD should be cleared upon any #DB exception

Intel SDM 17.2.4 (Debug Control Register (DR7)) says: "The processor clears the
GD flag upon entering to the debug exception handler." This sentence may be
misunderstood as if it happens only on #DB due to debug-register protection,
but it happens regardless to the cause of the #DB.

Fix the behavior to match both real hardware and Bochs.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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