From 17e8fa1ceb357d0008f651cd88a72f2630b24fc5 Mon Sep 17 00:00:00 2001
From: "plai@redhat.com" <plai@redhat.com>
Date: Fri, 31 Aug 2018 16:25:55 +0200
Subject: [PATCH 13/29] configure: add libpmem support

RH-Author: plai@redhat.com
Message-id: <1535732759-22481-6-git-send-email-plai@redhat.com>
Patchwork-id: 82010
O-Subject: [RHEL7.6 PATCH BZ 1539280 5/9] configure: add libpmem support
Bugzilla: 1539280
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
RH-Acked-by: Pankaj Gupta <pagupta@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

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.

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: Junyan He <junyan.he@intel.com>
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 17824406fa55b303379f2e4af715c1e876c3535f)
Signed-off-by: Paul Lai <plai@redhat.com>

Resolved Conflicts:
	configure

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 configure | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/configure b/configure
index a869f19..f9c8365 100755
--- a/configure
+++ b/configure
@@ -454,6 +454,7 @@ vxhs=""
 libxml2=""
 vtd="yes"
 rhel_target="rhv"
+libpmem=""
 
 supported_cpu="no"
 supported_os="no"
@@ -1387,6 +1388,10 @@ for opt do
   ;;
   --rhel-target=*) rhel_target="$optarg"
   ;;
+  --enable-libpmem) libpmem=yes
+  ;;
+  --disable-libpmem) libpmem=no
+  ;;
   *)
       echo "ERROR: unknown option $opt"
       echo "Try '$0 --help' for more information"
@@ -1648,6 +1653,7 @@ 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
@@ -5410,6 +5416,24 @@ 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
 
@@ -5873,6 +5897,7 @@ echo "VxHS block device $vxhs"
 echo "capstone          $capstone"
 echo "VT-d emulation    $vtd"
 echo "RHEL target       $rhel_target"
+echo "libpmem support   $libpmem"
 
 if test "$sdl_too_old" = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -6632,6 +6657,10 @@ if test "$rhel_target" = "rhv" ; then
   echo "CONFIG_RHV=y" >> $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
-- 
1.8.3.1