From patchwork Fri Mar 18 15:55:41 2011
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Subject: [3/3] alleviate time drift with HPET periodic timers
Date: Fri, 18 Mar 2011 05:55:41 -0000
From: Ulrich Obergfell <uobergfe@redhat.com>
X-Patchwork-Id: 87543
Message-Id: <946357411.421760.1300463741632.JavaMail.root@zmail07.collab.prod.int.phx2.redhat.com>
To: qemu-devel@nongnu.org
Cc: Jan Kiszka <jan.kiszka@siemens.com>, aliguori@us.ibm.com,
 kvm <kvm@vger.kernel.org>, gcosta@redhat.com

Part 3 of the patch implements the following options for the 'configure' script.

--disable-hpet-driftfix
--enable-hpet-driftfix

Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>


diff -up ./configure.orig3 ./configure
--- ./configure.orig3	2011-02-18 22:48:06.000000000 +0100
+++ ./configure	2011-03-13 12:43:44.870966181 +0100
@@ -140,6 +140,7 @@ linux_aio=""
 attr=""
 vhost_net=""
 xfs=""
+hpet_driftfix="no"
 
 gprof="no"
 debug_tcg="no"
@@ -749,6 +750,10 @@ for opt do
   ;;
   --enable-rbd) rbd="yes"
   ;;
+  --disable-hpet-driftfix) hpet_driftfix="no"
+  ;;
+  --enable-hpet-driftfix) hpet_driftfix="yes"
+  ;;
   *) echo "ERROR: unknown option $opt"; show_help="yes"
   ;;
   esac
@@ -2602,6 +2607,7 @@ echo "Trace output file $trace_file-<pid
 echo "spice support     $spice"
 echo "rbd support       $rbd"
 echo "xfsctl support    $xfs"
+echo "HPET drift fix    $hpet_driftfix"
 
 if test $sdl_too_old = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -2893,6 +2899,10 @@ if test "$rbd" = "yes" ; then
   echo "CONFIG_RBD=y" >> $config_host_mak
 fi
 
+if test "$hpet_driftfix" = "yes" ; then
+  echo "CONFIG_HPET_DRIFTFIX=y" >> $config_host_mak
+fi
+
 # USB host support
 case "$usb" in
 linux)