vhost: vhost net support

This adds vhost net device support in qemu. Will be tied to tap device
and virtio by following patches.  Raw backend is currently missing,
will be worked on/submitted separately.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/configure b/configure
index 30c6753eb6..59a6a8f9f5 100755
--- a/configure
+++ b/configure
@@ -263,6 +263,7 @@ vnc_tls=""
 vnc_sasl=""
 xen=""
 linux_aio=""
+vhost_net=""
 
 gprof="no"
 debug_tcg="no"
@@ -653,6 +654,10 @@ for opt do
   ;;
   --enable-docs) docs="yes"
   ;;
+  --disable-vhost-net) vhost_net="no"
+  ;;
+  --enable-vhost-net) vhost_net="yes"
+  ;;
   *) echo "ERROR: unknown option $opt"; show_help="yes"
   ;;
   esac
@@ -811,6 +816,8 @@ echo "  --disable-blobs          disable installing provided firmware blobs"
 echo "  --kerneldir=PATH         look for kernel includes in PATH"
 echo "  --enable-docs            enable documentation build"
 echo "  --disable-docs           disable documentation build"
+echo "  --disable-vhost-net      disable vhost-net acceleration support"
+echo "  --enable-vhost-net       enable vhost-net acceleration support"
 echo ""
 echo "NOTE: The object files are built at the place where configure is launched"
 exit 1
@@ -1503,6 +1510,32 @@ EOF
 fi
 
 ##########################################
+# test for vhost net
+
+if test "$vhost_net" != "no"; then
+    if test "$kvm" != "no"; then
+            cat > $TMPC <<EOF
+    #include <linux/vhost.h>
+    int main(void) { return 0; }
+EOF
+            if compile_prog "$kvm_cflags" "" ; then
+                vhost_net=yes
+            else
+                if test "$vhost_net" = "yes" ; then
+                    feature_not_found "vhost-net"
+                fi
+                vhost_net=no
+            fi
+    else
+            if test "$vhost_net" = "yes" ; then
+                echo -e "NOTE: vhost-net feature requires KVM (--enable-kvm)."
+                feature_not_found "vhost-net"
+            fi
+            vhost_net=no
+    fi
+fi
+
+##########################################
 # pthread probe
 PTHREADLIBS_LIST="-lpthread -lpthreadGC2"
 
@@ -1988,6 +2021,7 @@ echo "fdt support       $fdt"
 echo "preadv support    $preadv"
 echo "fdatasync         $fdatasync"
 echo "uuid support      $uuid"
+echo "vhost-net support $vhost_net"
 
 if test $sdl_too_old = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -2522,6 +2556,9 @@ case "$target_arch2" in
       if test "$kvm_para" = "yes"; then
         echo "CONFIG_KVM_PARA=y" >> $config_target_mak
       fi
+      if test $vhost_net = "yes" ; then
+        echo "CONFIG_VHOST_NET=y" >> $config_target_mak
+      fi
     fi
 esac
 if test "$target_bigendian" = "yes" ; then