File 0314-virtio-add-endian-ambivalent-suppor.patch of Package qemu.10255

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File 0314-virtio-add-endian-ambivalent-suppor.patch of Package qemu.10255

From c243bfdc9cf79eba513e08057839110da856bcfd Mon Sep 17 00:00:00 2001
From: Greg Kurz <gkurz@linux.vnet.ibm.com>
Date: Tue, 24 Jun 2014 19:38:54 +0200
Subject: [PATCH] virtio: add endian-ambivalent support to VirtIODevice

Some CPU families can dynamically change their endianness. This means we
can have little endian ppc or big endian arm guests for example. This has
an impact on legacy virtio data structures since they are target endian.
We hence introduce a new property to track the endianness of each virtio
device. It is reasonnably assumed that endianness won't change while the
device is in use : we hence capture the device endianness when it gets
reset.

We migrate this property in a subsection, after the device descriptor. This
means the load code must not rely on it until it is restored. As a consequence,
the vring sanity checks had to be moved after the call to vmstate_load_state().
We enforce paranoia by poisoning the property at the begining of virtio_load().

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 616a655219a92ae7cf5d6a7862e6489c6282009e)
[BR: Fix and/or infrastructure for BSC#1038396]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 include/hw/virtio/virtio.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 78dcd0bd4c..038c65c28a 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -265,9 +265,9 @@ void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
 void virtio_queue_notify_vq(VirtQueue *vq);
 void virtio_irq(VirtQueue *vq);
 
-bool target_words_bigendian(void);
-static inline bool virtio_is_big_endian(void)
+static inline bool virtio_is_big_endian(VirtIODevice *vdev)
 {
-    return target_words_bigendian();
+    assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
+    return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
 }
 #endif

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File 0314-virtio-add-endian-ambivalent-suppor.patch of Package qemu.10255

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