From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Fri, 21 Sep 2012 03:42:55 +0000 (+0200)
Subject: KVM: x86: Fix guest debug across vcpu INIT reset
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~15^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c863901075a42d50678616d8ee4b96ef13080498;p=pandora-kernel.git

KVM: x86: Fix guest debug across vcpu INIT reset

If we reset a vcpu on INIT, we so far overwrote dr7 as provided by
KVM_SET_GUEST_DEBUG, and we also cleared switch_db_regs unconditionally.

Fix this by saving the dr7 used for guest debugging and calculating the
effective register value as well as switch_db_regs on any potential
change. This will change to focus of the set_guest_debug vendor op to
update_dp_bp_intercept.

Found while trying to stop on start_secondary.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
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