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[Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} e
From: |
Alvise Rigo |
Subject: |
[Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns |
Date: |
Fri, 7 Aug 2015 19:03:11 +0200 |
Introduce the new --enable-tcg-ldst-excl configure option to enable the
LL/SC operations only for those backends that support them.
Suggested-by: Jani Kokkonen <address@hidden>
Suggested-by: Claudio Fontana <address@hidden>
Signed-off-by: Alvise Rigo <address@hidden>
---
configure | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/configure b/configure
index 33b9455..c3ea3db 100755
--- a/configure
+++ b/configure
@@ -264,6 +264,7 @@ debug_tcg="no"
debug="no"
strip_opt="yes"
tcg_interpreter="no"
+tcg_use_ldst_excl="no"
bigendian="no"
mingw32="no"
gcov="no"
@@ -934,6 +935,10 @@ for opt do
;;
--enable-tcg-interpreter) tcg_interpreter="yes"
;;
+ --disable-tcg-ldst-excl) tcg_use_ldst_excl="no"
+ ;;
+ --enable-tcg-ldst-excl) tcg_use_ldst_excl="yes"
+ ;;
--disable-cap-ng) cap_ng="no"
;;
--enable-cap-ng) cap_ng="yes"
@@ -1392,6 +1397,18 @@ if test "$ARCH" = "unknown"; then
fi
fi
+# Check if the slow-path for atomic instructions is supported by the
+# TCG backend.
+case $cpu in
+ i386|x86_64|arm|aarch64)
+ ;;
+ *)
+ if test "$tcg_use_ldst_excl" = "yes"; then
+ error_exit "Load and store exclusive not supported for $cpu hosts"
+ fi
+ ;;
+esac
+
# Consult white-list to determine whether to enable werror
# by default. Only enable by default for git builds
z_version=`cut -f3 -d. $source_path/VERSION`
@@ -4526,6 +4543,7 @@ echo "Install blobs $blobs"
echo "KVM support $kvm"
echo "RDMA support $rdma"
echo "TCG interpreter $tcg_interpreter"
+echo "use ld/st excl $tcg_use_ldst_excl"
echo "fdt support $fdt"
echo "preadv support $preadv"
echo "fdatasync $fdatasync"
@@ -4903,6 +4921,9 @@ fi
if test "$tcg_interpreter" = "yes" ; then
echo "CONFIG_TCG_INTERPRETER=y" >> $config_host_mak
fi
+if test "$tcg_use_ldst_excl" = "yes" ; then
+ echo "CONFIG_TCG_USE_LDST_EXCL=y" >> $config_host_mak
+fi
if test "$fdatasync" = "yes" ; then
echo "CONFIG_FDATASYNC=y" >> $config_host_mak
fi
--
2.5.0
- [Qemu-devel] [RFC v4 0/9] Slow-path for atomic instruction translation, Alvise Rigo, 2015/08/07
- [Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns,
Alvise Rigo <=
- Re: [Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns, Aurelien Jarno, 2015/08/08
- Re: [Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns, Peter Maydell, 2015/08/08
- Re: [Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns, Alex Bennée, 2015/08/09
- Re: [Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns, Aurelien Jarno, 2015/08/09
- Re: [Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns, Alex Bennée, 2015/08/09
- Re: [Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns, Aurelien Jarno, 2015/08/09
- Re: [Qemu-devel] [RFC v4 5/9] configure: Enable/disable new qemu_{ld, st} excl insns, Alex Bennée, 2015/08/09
[Qemu-devel] [RFC v4 3/9] softmmu: Add helpers for a new slowpath, Alvise Rigo, 2015/08/07