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virtio: endianness checks for virtio 1.0 devices 

Add code that checks for the VERSION_1 feature bit in order to make
decisions about the device's endianness. This allows us to support
transitional devices.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2015-06-04 12:34:11 +02:00 committed by Michael S. Tsirkin
parent 24bfa207ef
commit 3c185597c8
3 changed files with 15 additions and 3 deletions
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6
hw/virtio/virtio.c
View File

@ -903,7 +903,11 @@ static bool virtio_device_endian_needed(void *opaque)
VirtIODevice *vdev = opaque;
assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
return vdev->device_endian != virtio_default_endian();
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
return vdev->device_endian != virtio_default_endian();
}
/* Devices conforming to VIRTIO 1.0 or later are always LE. */
return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE;
}
static bool virtio_64bit_features_needed(void *opaque)

4
include/hw/virtio/virtio-access.h
View File

@ -19,6 +19,10 @@
static inline bool virtio_access_is_big_endian(VirtIODevice *vdev)
{
if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
/* Devices conforming to VIRTIO 1.0 or later are always LE. */
return false;
}
#if defined(TARGET_IS_BIENDIAN)
return virtio_is_big_endian(vdev);
#elif defined(TARGET_WORDS_BIGENDIAN)

8
include/hw/virtio/virtio.h
View File

@ -252,7 +252,11 @@ static inline bool virtio_has_feature(VirtIODevice *vdev, unsigned int fbit)
static inline bool virtio_is_big_endian(VirtIODevice *vdev)
{
assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
}
/* Devices conforming to VIRTIO 1.0 or later are always LE. */
return false;
}
#endif