Commit 17824406 authored by Junyan He's avatar Junyan He Committed by Michael S. Tsirkin
Browse files

configure: add libpmem support 

Add a pair of configure options --{enable,disable}-libpmem to control
whether QEMU is compiled with PMDK libpmem [1].

QEMU may write to the host persistent memory (e.g. in vNVDIMM label
emulation and live migration), so it must take the proper operations
to ensure the persistence of its own writes. Depending on the CPU
models and available instructions, the optimal operation can vary [2].
PMDK libpmem have already implemented those operations on multiple CPU
models (x86 and ARM) and the logic to select the optimal ones, so QEMU
can just use libpmem rather than re-implement them.

Libpem is a part of PMDK project(formerly known as NMVL).
The project's home page is: http://pmem.io/pmdk/
And the project's repository is: https://github.com/pmem/pmdk/



For more information about libpmem APIs, you can refer to the comments
in source code of: pmdk/src/libpmem/pmem.c, begin at line 33.

Signed-off-by: default avatarJunyan He <junyan.he@intel.com>
Signed-off-by: default avatarHaozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: default avatarIgor Mammedov <imammedo@redhat.com>
Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent cbfc0171

configure

+29 −0
Original line number Diff line number Diff line
@@ -475,6 +475,7 @@ vxhs="" 
libxml2=""

docker="no"

debug_mutex="no"

libpmem=""



# cross compilers defaults, can be overridden with --cross-cc-ARCH

cross_cc_aarch64="aarch64-linux-gnu-gcc"
@@ -1435,6 +1436,10 @@ for opt do 
  ;;

  --disable-debug-mutex) debug_mutex=no

  ;;

  --enable-libpmem) libpmem=yes

  ;;

  --disable-libpmem) libpmem=no

  ;;

  *)

      echo "ERROR: unknown option $opt"

      echo "Try '$0 --help' for more information"
@@ -1710,6 +1715,7 @@ disabled with --disable-FEATURE, default is enabled if available: 
  vhost-user      vhost-user support

  capstone        capstone disassembler support

  debug-mutex     mutex debugging support

  libpmem         libpmem support



NOTE: The object files are built at the place where configure is launched

EOF
@@ -5545,6 +5551,24 @@ if has "docker"; then 
    docker=$($python $source_path/tests/docker/docker.py probe)

fi



##########################################

# check for libpmem



if test "$libpmem" != "no"; then

	if $pkg_config --exists "libpmem"; then

		libpmem="yes"

		libpmem_libs=$($pkg_config --libs libpmem)

		libpmem_cflags=$($pkg_config --cflags libpmem)

		libs_softmmu="$libs_softmmu $libpmem_libs"

		QEMU_CFLAGS="$QEMU_CFLAGS $libpmem_cflags"

	else

		if test "$libpmem" = "yes" ; then

			feature_not_found "libpmem" "Install nvml or pmdk"

		fi

		libpmem="no"

	fi

fi



##########################################

# End of CC checks

# After here, no more $cc or $ld runs
@@ -6010,6 +6034,7 @@ echo "replication support $replication" 
echo "VxHS block device $vxhs"

echo "capstone          $capstone"

echo "docker            $docker"

echo "libpmem support   $libpmem"



if test "$sdl_too_old" = "yes"; then

echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -6763,6 +6788,10 @@ if test "$vxhs" = "yes" ; then 
  echo "VXHS_LIBS=$vxhs_libs" >> $config_host_mak

fi



if test "$libpmem" = "yes" ; then

  echo "CONFIG_LIBPMEM=y" >> $config_host_mak

fi



if test "$tcg_interpreter" = "yes"; then

  QEMU_INCLUDES="-iquote \$(SRC_PATH)/tcg/tci $QEMU_INCLUDES"

elif test "$ARCH" = "sparc64" ; then