[PATCH v7 10/46] virtio_config: endian conversion for v1.0

Michael S. Tsirkin
2014-11-30T15:10:31Z

We (ab)use virtio conversion functions for device-specific
config space accesses.

Based on original patches by Cornelia and Rusty.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
include/linux/virtio_config.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 02f0acb..1fa5faa 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -318,12 +318,13 @@ static inline u16 virtio_cread16(struct virtio_device *vdev,
{
u16 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
- return ret;
+ return virtio16_to_cpu(vdev, (__force __virtio16)ret);
}

static inline void virtio_cwrite16(struct virtio_device *vdev,
unsigned int offset, u16 val)
{
+ val = (__force u16)cpu_to_virtio16(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}

@@ -332,12 +333,13 @@ static inline u32 virtio_cread32(struct virtio_device *vdev,
{
u32 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
- return ret;
+ return virtio32_to_cpu(vdev, (__force __virtio32)ret);
}

static inline void virtio_cwrite32(struct virtio_device *vdev,
unsigned int offset, u32 val)
{
+ val = (__force u32)cpu_to_virtio32(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}

@@ -346,12 +348,13 @@ static inline u64 virtio_cread64(struct virtio_device *vdev,
{
u64 ret;
vdev->config->get(vdev, offset, &ret, sizeof(ret));
- return ret;
+ return virtio64_to_cpu(vdev, (__force __virtio64)ret);
}

static inline void virtio_cwrite64(struct virtio_device *vdev,
unsigned int offset, u64 val)
{
+ val = (__force u64)cpu_to_virtio64(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}

--
MST