build-sys: add --disable-vhost-user

Learn to compile out vhost-user (net, scsi & upcoming users). Keep it
enabled by default on non-win32, that is assumed to be POSIX. Fail if
trying to enable it on win32.

When trying to make a vhost-user netdev, it gives the following error:

-netdev vhost-user,id=foo,chardev=chr-test: Parameter 'type' expects a netdev backend type

And similar error with the HMP/QMP monitors.

While at it, rename CONFIG_VHOST_NET_TEST CONFIG_VHOST_USER_NET_TEST
since it's a vhost-user specific variable.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

configure

@@ -306,6 +306,7 @@ tcg="yes"
 vhost_net="no"
 vhost_scsi="no"
 vhost_vsock="no"
+vhost_user=""
 kvm="no"
 hax="no"
 rdma=""
@@ -1282,6 +1283,14 @@ for opt do
   ;;
   --enable-vxhs) vxhs="yes"
   ;;
+  --disable-vhost-user) vhost_user="no"
+  ;;
+  --enable-vhost-user)
+      vhost_user="yes"
+      if test "$mingw32" = "yes"; then
+          error_exit "vhost-user isn't available on win32"
+      fi
+  ;;
   *)
       echo "ERROR: unknown option $opt"
       echo "Try '$0 --help' for more information"
@@ -1290,6 +1299,14 @@ for opt do
   esac
 done
 
+if test "$vhost_user" = ""; then
+    if test "$mingw32" = "yes"; then
+        vhost_user="no"
+    else
+        vhost_user="yes"
+    fi
+fi
+
 case "$cpu" in
     ppc)
            CPU_CFLAGS="-m32"
@@ -1518,6 +1535,7 @@ disabled with --disable-FEATURE, default is enabled if available:
   tools           build qemu-io, qemu-nbd and qemu-image tools
   vxhs            Veritas HyperScale vDisk backend support
   crypto-afalg    Linux AF_ALG crypto backend driver
+  vhost-user      vhost-user support
 
 NOTE: The object files are built at the place where configure is launched
 EOF
@@ -5348,6 +5366,7 @@ echo "libcap-ng support $cap_ng"
 echo "vhost-net support $vhost_net"
 echo "vhost-scsi support $vhost_scsi"
 echo "vhost-vsock support $vhost_vsock"
+echo "vhost-user support $vhost_user"
 echo "Trace backends    $trace_backends"
 if have_backend "simple"; then
 echo "Trace output file $trace_file-<pid>"
@@ -5757,12 +5776,15 @@ fi
 if test "$vhost_scsi" = "yes" ; then
   echo "CONFIG_VHOST_SCSI=y" >> $config_host_mak
 fi
-if test "$vhost_net" = "yes" ; then
+if test "$vhost_net" = "yes" -a "$vhost_user" = "yes"; then
   echo "CONFIG_VHOST_NET_USED=y" >> $config_host_mak
 fi
 if test "$vhost_vsock" = "yes" ; then
   echo "CONFIG_VHOST_VSOCK=y" >> $config_host_mak
 fi
+if test "$vhost_user" = "yes" ; then
+  echo "CONFIG_VHOST_USER=y" >> $config_host_mak
+fi
 if test "$blobs" = "yes" ; then
   echo "INSTALL_BLOBS=yes" >> $config_host_mak
 fi
@@ -6358,7 +6380,9 @@ if supported_kvm_target $target; then
     echo "CONFIG_KVM=y" >> $config_target_mak
     if test "$vhost_net" = "yes" ; then
         echo "CONFIG_VHOST_NET=y" >> $config_target_mak
-        echo "CONFIG_VHOST_NET_TEST_$target_name=y" >> $config_host_mak
+        if test "$vhost_user" = "yes" ; then
+            echo "CONFIG_VHOST_USER_NET_TEST_$target_name=y" >> $config_host_mak
+        fi
     fi
 fi
 if supported_hax_target $target; then

default-configs/pci.mak

@@ -43,4 +43,4 @@ CONFIG_VGA=y
 CONFIG_VGA_PCI=y
 CONFIG_IVSHMEM_DEVICE=$(CONFIG_IVSHMEM)
 CONFIG_ROCKER=y
-CONFIG_VHOST_USER_SCSI=$(CONFIG_LINUX)
+CONFIG_VHOST_USER_SCSI=$(and $(CONFIG_VHOST_USER),$(CONFIG_LINUX))

default-configs/s390x-softmmu.mak

@@ -1,6 +1,6 @@
 CONFIG_PCI=y
 CONFIG_VIRTIO_PCI=y
-CONFIG_VHOST_USER_SCSI=$(CONFIG_LINUX)
+CONFIG_VHOST_USER_SCSI=$(and $(CONFIG_VHOST_USER),$(CONFIG_LINUX))
 CONFIG_VIRTIO=y
 CONFIG_SCLPCONSOLE=y
 CONFIG_TERMINAL3270=y

hw/virtio/virtio-pci.c

@@ -2135,7 +2135,7 @@ static const TypeInfo vhost_scsi_pci_info = {
 };
 #endif
 
-#ifdef CONFIG_LINUX
+#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
 /* vhost-user-scsi-pci */
 static Property vhost_user_scsi_pci_properties[] = {
     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
@@ -2665,7 +2665,7 @@ static void virtio_pci_register_types(void)
 #ifdef CONFIG_VHOST_SCSI
     type_register_static(&vhost_scsi_pci_info);
 #endif
-#ifdef CONFIG_LINUX
+#if defined(CONFIG_VHOST_USER) && defined(CONFIG_LINUX)
     type_register_static(&vhost_user_scsi_pci_info);
 #endif
 #ifdef CONFIG_VHOST_VSOCK

tests/Makefile.include

@@ -255,9 +255,9 @@ check-qtest-i386-y += tests/pc-cpu-test$(EXESUF)
 check-qtest-i386-y += tests/q35-test$(EXESUF)
 check-qtest-i386-y += tests/vmgenid-test$(EXESUF)
 gcov-files-i386-y += hw/pci-host/q35.c
-check-qtest-i386-$(CONFIG_VHOST_NET_TEST_i386) += tests/vhost-user-test$(EXESUF)
+check-qtest-i386-$(CONFIG_VHOST_USER_NET_TEST_i386) += tests/vhost-user-test$(EXESUF)
-ifeq ($(CONFIG_VHOST_NET_TEST_i386),)
+ifeq ($(CONFIG_VHOST_USER_NET_TEST_i386),)
-check-qtest-x86_64-$(CONFIG_VHOST_NET_TEST_x86_64) += tests/vhost-user-test$(EXESUF)
+check-qtest-x86_64-$(CONFIG_VHOST_USER_NET_TEST_x86_64) += tests/vhost-user-test$(EXESUF)
 endif
 check-qtest-i386-$(CONFIG_SLIRP) += tests/test-netfilter$(EXESUF)
 check-qtest-i386-y += tests/test-filter-mirror$(EXESUF)