vhost: add IOMMU-related macros for old kernels

These defines and enums have been introduced in upstream kernel v4.8,
and backported to RHEL 7.4.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Yuanhan Liu <yliu@fridaylinux.org>

diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 8405f87..94bee4c 100644 (file)
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -145,6 +145,37 @@ struct vhost_virtqueue {
  #define VIRTIO_NET_F_MTU 3
 #endif
 
+/* Declare IOMMU related bits for older kernels */
+#ifndef VIRTIO_F_IOMMU_PLATFORM
+
+#define VIRTIO_F_IOMMU_PLATFORM 33
+
+struct vhost_iotlb_msg {
+       __u64 iova;
+       __u64 size;
+       __u64 uaddr;
+#define VHOST_ACCESS_RO      0x1
+#define VHOST_ACCESS_WO      0x2
+#define VHOST_ACCESS_RW      0x3
+       __u8 perm;
+#define VHOST_IOTLB_MISS           1
+#define VHOST_IOTLB_UPDATE         2
+#define VHOST_IOTLB_INVALIDATE     3
+#define VHOST_IOTLB_ACCESS_FAIL    4
+       __u8 type;
+};
+
+#define VHOST_IOTLB_MSG 0x1
+
+struct vhost_msg {
+       int type;
+       union {
+               struct vhost_iotlb_msg iotlb;
+               __u8 padding[64];
+       };
+};
+#endif
+
 /*
  * Define virtio 1.0 for older kernels
  */