Add KVM support to QEMU
This patch adds very basic KVM support. KVM is a kernel module for Linux that
allows userspace programs to make use of hardware virtualization support. It
current supports x86 hardware virtualization using Intel VT-x or AMD-V. It
also supports IA64 VT-i, PPC 440, and S390.
This patch only implements the bare minimum support to get a guest booting. It
has very little impact the rest of QEMU and attempts to integrate nicely with
the rest of QEMU.
Even though this implementation is basic, it is significantly faster than TCG.
Booting and shutting down a Linux guest:
w/TCG: 1:32.36 elapsed 84% CPU
w/KVM: 0:31.14 elapsed 59% CPU
Right now, KVM is disabled by default and must be explicitly enabled with
-enable-kvm. We can enable it by default later when we have had better
testing.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5627 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/configure b/configure
index 8b0ad89..53167d5 100755
--- a/configure
+++ b/configure
@@ -115,6 +115,7 @@
nptl="yes"
mixemu="no"
bluez="yes"
+kvm="yes"
# OS specific
targetos=`uname -s`
@@ -303,6 +304,8 @@
;;
--disable-bluez) bluez="no"
;;
+ --disable-kvm) kvm="no"
+ ;;
--enable-profiler) profiler="yes"
;;
--enable-cocoa)
@@ -448,6 +451,7 @@
echo " --disable-vnc-tls disable TLS encryption for VNC server"
echo " --disable-curses disable curses output"
echo " --disable-bluez disable bluez stack connectivity"
+echo " --disable-kvm disable KVM acceleration support"
echo " --disable-nptl disable usermode NPTL support"
echo " --enable-system enable all system emulation targets"
echo " --disable-system disable all system emulation targets"
@@ -951,6 +955,30 @@
fi
##########################################
+# kvm probe
+if test "$kvm" = "yes" ; then
+ cat > $TMPC <<EOF
+#include <linux/kvm.h>
+#if !defined(KVM_API_VERSION) || \
+ KVM_API_VERSION < 12 || \
+ KVM_API_VERSION > 12 || \
+ !defined(KVM_CAP_USER_MEMORY) || \
+ !defined(KVM_CAP_SET_TSS_ADDR)
+#error Invalid KVM version
+#endif
+int main(void) { return 0; }
+EOF
+ # FIXME make this configurable
+ kvm_cflags=-I/lib/modules/`uname -r`/build/include
+ if $cc $ARCH_CFLAGS -o $TMPE ${OS_CFLAGS} $kvm_cflags $TMPC \
+ 2>/dev/null ; then
+ :
+ else
+ kvm="no"
+ fi
+fi
+
+##########################################
# AIO probe
if test "$aio" = "yes" ; then
aio=no
@@ -1036,6 +1064,7 @@
echo "NPTL support $nptl"
echo "vde support $vde"
echo "AIO support $aio"
+echo "KVM support $kvm"
if test $sdl_too_old = "yes"; then
echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -1411,6 +1440,15 @@
echo "#define CONFIG_QEMU_PREFIX \"$interp_prefix1\"" >> $config_h
gdb_xml_files=""
+# FIXME allow i386 to build on x86_64 and vice versa
+if test "$kvm" = "yes" -a "$target_cpu" != "$cpu" ; then
+ kvm="no"
+fi
+# Disable KVM for linux-user
+if test "$kvm" = "yes" -a "$target_softmmu" = "no" ; then
+ kvm="no"
+fi
+
case "$target_cpu" in
i386)
echo "TARGET_ARCH=i386" >> $config_mak
@@ -1420,6 +1458,11 @@
then
echo "#define USE_KQEMU 1" >> $config_h
fi
+ if test "$kvm" = "yes" ; then
+ echo "CONFIG_KVM=yes" >> $config_mak
+ echo "KVM_CFLAGS=$kvm_cflags" >> $config_mak
+ echo "#define CONFIG_KVM" >> $config_h
+ fi
gcc3minver=`$cc --version 2> /dev/null| fgrep "(GCC) 3." | awk '{ print $3 }' | cut -f2 -d.`
if test -n "$gcc3minver" && test $gcc3minver -gt 3
then
@@ -1437,6 +1480,11 @@
then
echo "#define USE_KQEMU 1" >> $config_h
fi
+ if test "$kvm" = "yes" ; then
+ echo "CONFIG_KVM=yes" >> $config_mak
+ echo "KVM_CFLAGS=$kvm_cflags" >> $config_mak
+ echo "#define CONFIG_KVM 1" >> $config_h
+ fi
;;
alpha)
echo "TARGET_ARCH=alpha" >> $config_mak
