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. [1] PMDK (formerly known as NMVL), https://github.com/pmem/pmdk/ [2] https://github.com/pmem/pmdk/blob/38bfa652721a37fd94c0130ce0e3f5d8baa3ed40/src/libpmem/pmem.c#L33 Signed-off-by: Haozhong Zhang <haozhong.zh...@intel.com> --- configure | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/configure b/configure index 913e14839d..ba9953fffe 100755 --- a/configure +++ b/configure @@ -450,6 +450,7 @@ jemalloc="no" replication="yes" vxhs="" libxml2="" +libpmem="" supported_cpu="no" supported_os="no" @@ -1359,6 +1360,10 @@ for opt do ;; --disable-git-update) git_update=no ;; + --enable-libpmem) libpmem=yes + ;; + --disable-libpmem) libpmem=no + ;; *) echo "ERROR: unknown option $opt" echo "Try '$0 --help' for more information" @@ -1611,6 +1616,7 @@ disabled with --disable-FEATURE, default is enabled if available: crypto-afalg Linux AF_ALG crypto backend driver vhost-user vhost-user support capstone capstone disassembler support + libpmem libpmem support NOTE: The object files are built at the place where configure is launched EOF @@ -5345,6 +5351,30 @@ EOF fi fi +########################################## +# check for libpmem + +if test "$libpmem" != "no"; then + cat > $TMPC <<EOF +#include <libpmem.h> +int main(void) +{ + pmem_is_pmem(0, 0); + return 0; +} +EOF + libpmem_libs="-lpmem" + if compile_prog "" "$libpmem_libs" ; then + libs_softmmu="$libpmem_libs $libs_softmmu" + libpmem="yes" + else + if test "$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 @@ -5815,6 +5845,7 @@ echo "avx2 optimization $avx2_opt" echo "replication support $replication" echo "VxHS block device $vxhs" echo "capstone $capstone" +echo "libpmem support $libpmem" if test "$sdl_too_old" = "yes"; then echo "-> Your SDL version is too old - please upgrade to have SDL support" @@ -6540,6 +6571,10 @@ 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="-I\$(SRC_PATH)/tcg/tci $QEMU_INCLUDES" elif test "$ARCH" = "sparc64" ; then -- 2.16.1
