[PATCH v5 28/45] vhost: add memory access wrappers
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: 2014-11-27 12:32:47
Also in:
kvm, lkml
Subsystem:
the rest, virtio host (vhost) · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
Add guest memory access wrappers to handle virtio endianness conversions. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- drivers/vhost/vhost.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index c624b09..1f321fd 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h@@ -176,4 +176,35 @@ static inline int vhost_has_feature(struct vhost_virtqueue *vq, int bit) { return vq->acked_features & (1ULL << bit); } + +/* Memory accessors */ +static inline u16 vhost16_to_cpu(struct vhost_virtqueue *vq, __virtio16 val) +{ + return __virtio16_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val); +} + +static inline __virtio16 cpu_to_vhost16(struct vhost_virtqueue *vq, u16 val) +{ + return __cpu_to_virtio16(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val); +} + +static inline u32 vhost32_to_cpu(struct vhost_virtqueue *vq, __virtio32 val) +{ + return __virtio32_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val); +} + +static inline __virtio32 cpu_to_vhost32(struct vhost_virtqueue *vq, u32 val) +{ + return __cpu_to_virtio32(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val); +} + +static inline u64 vhost64_to_cpu(struct vhost_virtqueue *vq, __virtio64 val) +{ + return __virtio64_to_cpu(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val); +} + +static inline __virtio64 cpu_to_vhost64(struct vhost_virtqueue *vq, u64 val) +{ + return __cpu_to_virtio64(vhost_has_feature(vq, VIRTIO_F_VERSION_1), val); +} #endif
--
MST