Re: [Qemu-devel] [PATCH V8 04/14] Add tpm_tis driver to build process

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Aug 31, 2011 at 10:35:55AM -0400, Stefan Berger wrote:
> The TPM interface (tpm_tis) needs to be explicitly enabled via
> ./configure --enable-tpm. This patch also restricts the building of the
> TPM support to i386 and x86_64 targets since only there it is currently
> supported. This prevents that one will end up with support for a frontend
> but no available backend.

This can happen anyway - just don't load the tpms driver :)
Presumably if libtpms exists on the system, we should
assume it's there for a reason. configure should test
that IMO and not limit architectures artificially.

> 
> v3:
>  - fixed and moved hunks in Makefile.target into right place
> 
> Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
> Index:qemu/Makefile.target
> ===================================================================
> ---
>  Makefile.target |    1 +
>  configure       |   20 ++++++++++++++++++++
>  2 files changed, 21 insertions(+)
> 
> Index: qemu-git/Makefile.target
> ===================================================================
> --- qemu-git.orig/Makefile.target
> +++ qemu-git/Makefile.target
> @@ -233,6 +233,7 @@ obj-i386-y += debugcon.o multiboot.o
>  obj-i386-y += pc_piix.o
>  obj-i386-$(CONFIG_KVM) += kvmclock.o
>  obj-i386-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
> +obj-i386-$(CONFIG_TPM) += tpm_tis.o
>  
>  # shared objects
>  obj-ppc-y = ppc.o
> Index: qemu-git/configure
> ===================================================================
> --- qemu-git.orig/configure
> +++ qemu-git/configure
> @@ -183,6 +183,7 @@ usb_redir=""
>  opengl=""
>  zlib="yes"
>  guest_agent="yes"
> +tpm="no"
>  
>  # parse CC options first
>  for opt do
> @@ -765,6 +766,8 @@ for opt do
>    ;;
>    --disable-guest-agent) guest_agent="no"
>    ;;
> +  --enable-tpm) tpm="yes"
> +  ;;
>    *) echo "ERROR: unknown option $opt"; show_help="yes"
>    ;;
>    esac
> @@ -1044,6 +1047,7 @@ echo "  --disable-usb-redir      disable
>  echo "  --enable-usb-redir       enable usb network redirection support"
>  echo "  --disable-guest-agent    disable building of the QEMU Guest Agent"
>  echo "  --enable-guest-agent     enable building of the QEMU Guest Agent"
> +echo "  --enable-tpm             enable an emulated TPM"
>  echo ""
>  echo "NOTE: The object files are built at the place where configure is launched"
>  exit 1
> @@ -2731,6 +2735,7 @@ echo "nss used          $smartcard_nss"
>  echo "usb net redir     $usb_redir"
>  echo "OpenGL support    $opengl"
>  echo "build guest agent $guest_agent"
> +echo "TPM support       $tpm"
>  
>  if test "$sdl_too_old" = "yes"; then
>  echo "-> Your SDL version is too old - please upgrade to have SDL support"
> @@ -3555,6 +3560,21 @@ if test "$gprof" = "yes" ; then
>    fi
>  fi
>  
> +if test "$tpm" = "yes"; then
> +  has_tpm=0
> +  if test "$target_softmmu" = "yes" ; then
> +    case "$TARGET_BASE_ARCH" in
> +    i386)
> +      has_tpm=1
> +    ;;
> +    esac
> +  fi
> +
> +  if test "$has_tpm" = "1"; then
> +      echo "CONFIG_TPM=y" >> $config_host_mak
> +  fi
> +fi
> +
>  linker_script="-Wl,-T../config-host.ld -Wl,-T,\$(SRC_PATH)/\$(ARCH).ld"
>  if test "$target_linux_user" = "yes" -o "$target_bsd_user" = "yes" ; then
>    case "$ARCH" in
>