diff mbox

[V6,4/7] configure: add libpmem support

Message ID 1527840629-18648-5-git-send-email-junyan.he@gmx.com (mailing list archive)
State New, archived
Headers show

Commit Message

junyan.he@gmx.com June 1, 2018, 8:10 a.m. UTC 
From: Junyan He <junyan.he@intel.com>

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: Junyan He <junyan.he@intel.com>
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
---
 configure | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

Comments

Stefan Hajnoczi June 5, 2018, 11:41 a.m. UTC | #1 
On Fri, Jun 01, 2018 at 04:10:26PM +0800, junyan.he@gmx.com wrote:
> From: Junyan He <junyan.he@intel.com>
> 
> 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: Junyan He <junyan.he@intel.com>
> Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
> ---
>  configure | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
diff mbox

Patch

diff --git a/configure b/configure
index a6a4616..f44d669 100755
--- a/configure
+++ b/configure
@@ -456,6 +456,7 @@  jemalloc="no"
 replication="yes"
 vxhs=""
 libxml2=""
+libpmem=""
 
 supported_cpu="no"
 supported_os="no"
@@ -1381,6 +1382,10 @@  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"
@@ -1638,6 +1643,7 @@  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
@@ -5445,6 +5451,24 @@  EOF
 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
 
@@ -5907,6 +5931,7 @@  echo "avx2 optimization $avx2_opt"
 echo "replication support $replication"
 echo "VxHS block device $vxhs"
 echo "capstone          $capstone"
+echo "libpmem support   $libpmem"
 
 if test "$sdl_too_old" = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -6651,6 +6676,10 @@  if test "$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