From: Avi Kivity <avi@redhat.com>
Date: Tue, 1 Sep 2009 13:06:25 +0000 (+0300)
Subject: KVM: VMX: Conditionally reload debug register 6
X-Git-Tag: v2.6.32-rc1~693^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e8a48342e9bc1c65ffe4bb3b3ac964e726dbd4c0;p=pandora-kernel.git

KVM: VMX: Conditionally reload debug register 6

Only reload debug register 6 if we're running with the guest's
debug registers.  Saves around 150 cycles from the guest lightweight
exit path.

dr6 contains a couple of bits that are updated on #DB, so intercept
that unconditionally and update those bits then.

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