configure: enable --s390-pgste linker option

KVM guests on s390 need a different page table layout than normal
processes (2kb page table + 2kb page status extensions vs 2kb page table
only). As of today this has to be enabled via the vm.allocate_pgste
sysctl.

Newer kernels (>= 4.12) on s390 check for an S390_PGSTE program header
and enable the pgste page table extensions in that case. This makes the
vm.allocate_pgste sysctl unnecessary. We enable this program header for
the s390 system emulation (qemu-system-s390x) if we build on s390
- for s390 system emulation
- the linker supports --s390-pgste (binutils >= 2.29)
- KVM is enabled

This will allow distributions to disable the global vm.allocate_pgste
sysctl, which will improve the page table allocation for non KVM
processes as only 2kb chunks are necessary.

Cc: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Cc: Alexander Graf <agraf@suse.de>
Cc: Dan Horak <dhorak@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <1503483383-199649-1-git-send-email-borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Christian Borntraeger 2017-08-23 12:16:23 +02:00 committed by Cornelia Huck
parent eb569af835
commit e9a3591fa0
1 changed files with 20 additions and 1 deletions

21
configure vendored
View File

@ -240,6 +240,11 @@ supported_target() {
return 1
}
ld_has() {
$ld --help 2>/dev/null | grep ".$1" >/dev/null 2>&1
}
# default parameters
source_path=$(dirname "$0")
cpu=""
@ -5043,7 +5048,7 @@ fi
# Use ASLR, no-SEH and DEP if available
if test "$mingw32" = "yes" ; then
for flag in --dynamicbase --no-seh --nxcompat; do
if $ld --help 2>/dev/null | grep ".$flag" >/dev/null 2>/dev/null ; then
if ld_has $flag ; then
LDFLAGS="-Wl,$flag $LDFLAGS"
fi
done
@ -6522,6 +6527,20 @@ if test "$target_linux_user" = "yes" -o "$target_bsd_user" = "yes" ; then
ldflags="$ldflags $textseg_ldflags"
fi
# Newer kernels on s390 check for an S390_PGSTE program header and
# enable the pgste page table extensions in that case. This makes
# the vm.allocate_pgste sysctl unnecessary. We enable this program
# header if
# - we build on s390x
# - we build the system emulation for s390x (qemu-system-s390x)
# - KVM is enabled
# - the linker supports --s390-pgste
if test "$TARGET_ARCH" = "s390x" -a "$target_softmmu" = "yes" -a "$ARCH" = "s390x" -a "$kvm" = "yes"; then
if ld_has --s390-pgste ; then
ldflags="-Wl,--s390-pgste $ldflags"
fi
fi
echo "LDFLAGS+=$ldflags" >> $config_target_mak
echo "QEMU_CFLAGS+=$cflags" >> $config_target_mak