configure: fix TPM logic

A non-native i386 or x86_64 emulator should not have TPM passthrough
support, since the TPM is only present for those hosts.

Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -2336,6 +2336,15 @@ EOF
   fi
 fi
 
+##########################################
+# TPM passthrough is only on x86 Linux
+
+if test "$targetos" = Linux && test "$cpu" = i386 -o "$cpu" = x86_64; then
+  tpm_passthrough=$tpm
+else
+  tpm_passthrough=no
+fi
+
 ##########################################
 # adjust virtio-blk-data-plane based on linux-aio
 
@@ -3436,6 +3445,7 @@ echo "virtio-blk-data-plane $virtio_blk_data_plane"
 echo "gcov              $gcov_tool"
 echo "gcov enabled      $gcov"
 echo "TPM support       $tpm"
+echo "TPM passthrough   $tpm_passthrough"
 
 if test "$sdl_too_old" = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -3811,6 +3821,14 @@ bsd)
 ;;
 esac
 
+# TPM passthrough support?
+if test "$tpm" = "yes"; then
+  echo 'CONFIG_TPM=$(CONFIG_SOFTMMU)' >> $config_host_mak
+  if test "$tpm_passthrough" = "yes"; then
+    echo "CONFIG_TPM_PASSTHROUGH=y" >> $config_host_mak
+  fi
+fi
+
 # use default implementation for tracing backend-specific routines
 trace_default=yes
 echo "TRACE_BACKEND=$trace_backend" >> $config_host_mak
@@ -4338,12 +4356,6 @@ if test "$gprof" = "yes" ; then
   fi
 fi
 
-if test "$tpm" = "yes"; then
-  if test "$target_softmmu" = "yes" ; then
-    echo "CONFIG_TPM=y" >> $config_host_mak
-  fi
-fi
-
 if test "$ARCH" = "tci"; then
   linker_script=""
 else

default-configs/i386-softmmu.mak

@@ -27,8 +27,7 @@ CONFIG_HPET=y
 CONFIG_APPLESMC=y
 CONFIG_I8259=y
 CONFIG_PFLASH_CFI01=y
-CONFIG_TPM_TIS=y
-CONFIG_TPM_PASSTHROUGH=y
+CONFIG_TPM_TIS=$(CONFIG_TPM)
 CONFIG_PCI_HOTPLUG=y
 CONFIG_MC146818RTC=y
 CONFIG_PAM=y

default-configs/x86_64-softmmu.mak

@@ -27,8 +27,7 @@ CONFIG_HPET=y
 CONFIG_APPLESMC=y
 CONFIG_I8259=y
 CONFIG_PFLASH_CFI01=y
-CONFIG_TPM_TIS=y
-CONFIG_TPM_PASSTHROUGH=y
+CONFIG_TPM_TIS=$(CONFIG_TPM)
 CONFIG_PCI_HOTPLUG=y
 CONFIG_MC146818RTC=y
 CONFIG_PAM=y

tpm/Makefile.objs

 common-obj-y = tpm.o
-ifeq ($(CONFIG_TPM),y)
-common-obj-y += tpm_backend.o
+common-obj-$(CONFIG_TPM) += tpm_backend.o
 common-obj-$(CONFIG_TPM_TIS) += tpm_tis.o
 common-obj-$(CONFIG_TPM_PASSTHROUGH) += tpm_passthrough.o
-endif