From 4a1418e07bdcfaa3177739e04707ecaec75d89e1 Mon Sep 17 00:00:00 2001
From: Anthony Liguori <aliguori@us.ibm.com>
Date: Mon, 10 Aug 2009 17:07:24 -0500
Subject: Unbreak large mem support by removing kqemu

kqemu introduces a number of restrictions on the i386 target.  The worst is that
it prevents large memory from working in the default build.

Furthermore, kqemu is fundamentally flawed in a number of ways.  It relies on
the TSC as a time source which will not be reliable on a multiple processor
system in userspace.  Since most modern processors are multicore, this severely
limits the utility of kqemu.

kvm is a viable alternative for people looking to accelerate qemu and has the
benefit of being supported by the upstream Linux kernel.  If someone can
implement work arounds to remove the restrictions introduced by kqemu, I'm
happy to avoid and/or revert this patch.

N.B. kqemu will still function in the 0.11 series but this patch removes it from
the 0.12 series.

Paul, please Ack or Nack this patch.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 configure | 27 ---------------------------
 1 file changed, 27 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index 38503b2..6de38d5 100755
--- a/configure
+++ b/configure
@@ -185,7 +185,6 @@ vnc_sasl="yes"
 bsd="no"
 linux="no"
 solaris="no"
-kqemu="no"
 profiler="no"
 cocoa="no"
 softmmu="yes"
@@ -238,25 +237,16 @@ MINGW32*)
 GNU/kFreeBSD)
   audio_drv_list="oss"
   audio_possible_drivers="oss sdl esd pa"
-  if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
-    kqemu="yes"
-  fi
 ;;
 FreeBSD)
   bsd="yes"
   audio_drv_list="oss"
   audio_possible_drivers="oss sdl esd pa"
-  if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
-    kqemu="yes"
-  fi
 ;;
 DragonFly)
   bsd="yes"
   audio_drv_list="oss"
   audio_possible_drivers="oss sdl esd pa"
-  if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
-    kqemu="yes"
-  fi
   aio="no"
 ;;
 NetBSD)
@@ -320,9 +310,6 @@ SunOS)
         exit 1
       fi
     fi
-    if test "$solarisrev" -ge 9 ; then
-      kqemu="yes"
-    fi
   fi
   if test -f /usr/include/sys/soundcard.h ; then
     audio_drv_list="oss"
@@ -343,7 +330,6 @@ AIX)
   usb="linux"
   kvm="yes"
   if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
-    kqemu="yes"
     audio_possible_drivers="$audio_possible_drivers fmod"
   fi
 ;;
@@ -358,9 +344,6 @@ if [ "$bsd" = "yes" ] ; then
 fi
 
 if test "$mingw32" = "yes" ; then
-  if [ "$cpu" = "i386" ] ; then
-    kqemu="yes"
-  fi
   EXESUF=".exe"
   QEMU_CFLAGS="-DWIN32_LEAN_AND_MEAN -DWINVER=0x501 $QEMU_CFLAGS"
   LIBS="-lwinmm -lws2_32 -liphlpapi $LIBS"
@@ -450,8 +433,6 @@ for opt do
   ;;
   --disable-vde) vde="no"
   ;;
-  --disable-kqemu) kqemu="no"
-  ;;
   --disable-xen) xen="no"
   ;;
   --disable-brlapi) brlapi="no"
@@ -597,9 +578,6 @@ echo "  --interp-prefix=PREFIX   where to find shared libraries, etc."
 echo "                           use %M for cpu name [$interp_prefix]"
 echo "  --target-list=LIST       set target list [$target_list]"
 echo ""
-echo "kqemu kernel acceleration support:"
-echo "  --disable-kqemu          disable kqemu support"
-echo ""
 echo "Advanced options (experts only):"
 echo "  --source-path=PATH       path of source code [$source_path]"
 echo "  --cross-prefix=PREFIX    use PREFIX for compile tools [$cross_prefix]"
@@ -1534,7 +1512,6 @@ fi
 if test -n "$sparc_cpu"; then
     echo "Target Sparc Arch $sparc_cpu"
 fi
-echo "kqemu support     $kqemu"
 echo "xen support       $xen"
 echo "brlapi support    $brlapi"
 echo "Documentation     $build_docs"
@@ -2019,10 +1996,6 @@ case "$target_arch2" in
     if test "$xen" = "yes" -a "$target_softmmu" = "yes" ; then
       echo "CONFIG_XEN=y" >> $config_mak
     fi
-    if test $kqemu = "yes" -a "$target_softmmu" = "yes"
-    then
-      echo "CONFIG_KQEMU=y" >> $config_mak
-    fi
 esac
 case "$target_arch2" in
   i386|x86_64|ppcemb|ppc|ppc64)
-- 
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