From 28bf8a9f3cf68ad57042fc5d2585c32afcc83ad2 Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Fri, 3 Jul 2015 19:13:34 +0200
Subject: [PATCH 024/100] virtio: introduce virtio_legacy_is_cross_endian()
Message-id: <1435950819-10991-3-git-send-email-thuth@redhat.com>
Patchwork-id: 66695
O-Subject: [RHEL7.2 qemu-kvm-rhev PATCH 2/7] virtio: introduce virtio_legacy_is_cross_endian()
Bugzilla: 1225715
RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: David Gibson <dgibson@redhat.com>
From: Greg Kurz <gkurz@linux.vnet.ibm.com>
This helper will be used by vhost and tap to detect cross-endianness in
the legacy virtio case.
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 41d283bdab08868a244b9c19dce507fdf15a8990)
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
include/hw/virtio/virtio-access.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/include/hw/virtio/virtio-access.h b/include/hw/virtio/virtio-access.h
index 46456fd..caf0940 100644
--- a/include/hw/virtio/virtio-access.h
+++ b/include/hw/virtio/virtio-access.h
@@ -28,6 +28,19 @@ static inline bool virtio_access_is_big_endian(VirtIODevice *vdev)
#endif
}
+static inline bool virtio_legacy_is_cross_endian(VirtIODevice *vdev)
+{
+#ifdef TARGET_IS_BIENDIAN
+#ifdef HOST_WORDS_BIGENDIAN
+ return !virtio_is_big_endian(vdev);
+#else
+ return virtio_is_big_endian(vdev);
+#endif
+#else
+ return false;
+#endif
+}
+
static inline uint16_t virtio_lduw_phys(VirtIODevice *vdev, hwaddr pa)
{
if (virtio_access_is_big_endian(vdev)) {
--
1.8.3.1