build: move vhost-scsi configuration to Kconfig

vhost-scsi and vhost-user-scsi are two devices of their own; it should
be possible to enable/disable them with --without-default-devices, not
--without-default-features.  Compute their default value in Kconfig to
obtain the more intuitive behavior.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -285,7 +285,6 @@ EXTRA_LDFLAGS=""
 vhost_kernel="$default_feature"
 vhost_net="$default_feature"
 vhost_crypto="$default_feature"
-vhost_scsi="$default_feature"
 vhost_user="no"
 vhost_user_fs="$default_feature"
 vhost_vdpa="$default_feature"
@@ -874,10 +873,6 @@ for opt do
   ;;
   --enable-vhost-crypto) vhost_crypto="yes"
   ;;
-  --disable-vhost-scsi) vhost_scsi="no"
-  ;;
-  --enable-vhost-scsi) vhost_scsi="yes"
-  ;;
   --disable-vhost-user-fs) vhost_user_fs="no"
   ;;
   --enable-vhost-user-fs) vhost_user_fs="yes"
@@ -1104,7 +1099,6 @@ cat << EOF
   safe-stack      SafeStack Stack Smash Protection. Depends on
                   clang/llvm >= 3.7 and requires coroutine backend ucontext.
   vhost-net       vhost-net kernel acceleration support
-  vhost-scsi      vhost-scsi kernel target support
   vhost-crypto    vhost-user-crypto backend support
   vhost-kernel    vhost kernel backend support
   vhost-user      vhost-user backend support
@@ -1538,12 +1532,6 @@ if test "$vhost_kernel" = "yes" && test "$linux" != "yes"; then
   error_exit "vhost-kernel is only available on Linux"
 fi
 
-# vhost-kernel devices
-test "$vhost_scsi" = "" && vhost_scsi=$vhost_kernel
-if test "$vhost_scsi" = "yes" && test "$vhost_kernel" != "yes"; then
-  error_exit "--enable-vhost-scsi requires --enable-vhost-kernel"
-fi
-
 # vhost-user backends
 test "$vhost_crypto" = "" && vhost_crypto=$vhost_user
 if test "$vhost_crypto" = "yes" && test "$vhost_user" = "no"; then
@@ -2080,9 +2068,6 @@ if test "$modules" = "yes"; then
   echo "CONFIG_MODULES=y" >> $config_host_mak
 fi
 
-if test "$vhost_scsi" = "yes" ; then
-  echo "CONFIG_VHOST_SCSI=y" >> $config_host_mak
-fi
 if test "$vhost_net" = "yes" ; then
   echo "CONFIG_VHOST_NET=y" >> $config_host_mak
 fi

hw/scsi/Kconfig

@@ -48,6 +48,11 @@ config VIRTIO_SCSI
     depends on VIRTIO
     select SCSI
 
+config VHOST_SCSI
+    bool
+    default y
+    depends on VIRTIO && VHOST_KERNEL
+
 config VHOST_USER_SCSI
     bool
     # Only PCI devices are provided for now

include/hw/virtio/virtio-scsi.h

@@ -55,10 +55,8 @@ struct VirtIOSCSIConf {
     bool seg_max_adjust;
     uint32_t max_sectors;
     uint32_t cmd_per_lun;
-#ifdef CONFIG_VHOST_SCSI
     char *vhostfd;
     char *wwpn;
-#endif
     CharBackend chardev;
     uint32_t boot_tpgt;
     IOThread *iothread;

meson.build

@@ -3691,7 +3691,6 @@ summary_info += {'QOM debugging':     get_option('qom_cast_debug')}
 summary_info += {'vhost-kernel support': config_host.has_key('CONFIG_VHOST_KERNEL')}
 summary_info += {'vhost-net support': config_host.has_key('CONFIG_VHOST_NET')}
 summary_info += {'vhost-crypto support': config_host.has_key('CONFIG_VHOST_CRYPTO')}
-summary_info += {'vhost-scsi support': config_host.has_key('CONFIG_VHOST_SCSI')}
 summary_info += {'vhost-user support': config_host.has_key('CONFIG_VHOST_USER')}
 summary_info += {'vhost-user-blk server support': have_vhost_user_blk_server}
 summary_info += {'vhost-user-fs support': config_host.has_key('CONFIG_VHOST_USER_FS')}

scripts/ci/org.centos/stream/8/x86_64/configure

@@ -132,7 +132,6 @@
 --disable-vhost-crypto \
 --disable-vhost-kernel \
 --disable-vhost-net \
---disable-vhost-scsi \
 --disable-vhost-user \
 --disable-vhost-user-blk-server \
 --disable-vhost-vdpa \