configure: Use an explicit CONFIG_IVSHMEM rather than CONFIG_EVENTFD

Rather than relying on everywhere that cares about whether the host
supports ivshmem using CONFIG_EVENTFD, make configure set an explicit
CONFIG_IVSHMEM.

Signed-off-by: Kamil Rytarowski <n54@gmx.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1500021225-4118-3-git-send-email-peter.maydell@linaro.org
[PMM: split out from another patch, add commit message]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

configure

@@ -5038,6 +5038,11 @@ qemu_moddir=$libdir$confsuffix
 qemu_datadir=$datadir$confsuffix
 qemu_localedir="$datadir/locale"
 
+# We can only support ivshmem if we have eventfd
+if [ "$eventfd" = "yes" ]; then
+  ivshmem=yes
+fi
+
 tools=""
 if test "$want_tools" = "yes" ; then
   tools="qemu-img\$(EXESUF) qemu-io\$(EXESUF) $tools"
@@ -6033,6 +6038,10 @@ if test "$have_utmpx" = "yes" ; then
   echo "HAVE_UTMPX=y" >> $config_host_mak
 fi
 
+if test "$ivshmem" = "yes" ; then
+  echo "CONFIG_IVSHMEM=y" >> $config_host_mak
+fi
+
 # Hold two types of flag:
 #   CONFIG_THREAD_SETNAME_BYTHREAD  - we've got a way of setting the name on
 #                                     a thread we have a handle to

default-configs/pci.mak

@@ -41,6 +41,6 @@ CONFIG_SDHCI=y
 CONFIG_EDU=y
 CONFIG_VGA=y
 CONFIG_VGA_PCI=y
-CONFIG_IVSHMEM_DEVICE=$(CONFIG_EVENTFD)
+CONFIG_IVSHMEM_DEVICE=$(CONFIG_IVSHMEM)
 CONFIG_ROCKER=y
 CONFIG_VHOST_USER_SCSI=$(CONFIG_LINUX)

tests/Makefile.include

@@ -204,7 +204,7 @@ gcov-files-pci-y += hw/display/virtio-gpu-pci.c
 gcov-files-pci-$(CONFIG_VIRTIO_VGA) += hw/display/virtio-vga.c
 check-qtest-pci-y += tests/intel-hda-test$(EXESUF)
 gcov-files-pci-y += hw/audio/intel-hda.c hw/audio/hda-codec.c
-check-qtest-pci-$(CONFIG_EVENTFD) += tests/ivshmem-test$(EXESUF)
+check-qtest-pci-$(CONFIG_IVSHMEM) += tests/ivshmem-test$(EXESUF)
 gcov-files-pci-y += hw/misc/ivshmem.c
 check-qtest-pci-y += tests/megasas-test$(EXESUF)
 gcov-files-pci-y += hw/scsi/megasas.c
@@ -306,7 +306,7 @@ check-qtest-ppc64-y += tests/test-filter-mirror$(EXESUF)
 check-qtest-ppc64-y += tests/test-filter-redirector$(EXESUF)
 check-qtest-ppc64-y += tests/display-vga-test$(EXESUF)
 check-qtest-ppc64-y += tests/numa-test$(EXESUF)
-check-qtest-ppc64-$(CONFIG_EVENTFD) += tests/ivshmem-test$(EXESUF)
+check-qtest-ppc64-$(CONFIG_IVSHMEM) += tests/ivshmem-test$(EXESUF)
 
 check-qtest-sh4-y = tests/endianness-test$(EXESUF)