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-rw-r--r--virtio-v1.0-wd01-part1-specification.txt40
1 files changed, 22 insertions, 18 deletions
diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt
index b166721..6854023 100644
--- a/virtio-v1.0-wd01-part1-specification.txt
+++ b/virtio-v1.0-wd01-part1-specification.txt
@@ -1720,6 +1720,10 @@ discoverable via standard operating system algorithms, and adding
virtio support is mainly a question of supporting a new control
unit type.
+As the S/390 is a big endian machine, these channel commands are
+big-endian: this is made clear by use of the types be16, be32 and
+be64.
+
2.3.3.1. Basic Concepts
-----------------------
@@ -1799,8 +1803,8 @@ CCW_CMD_READ_VQ_CONF is issued by the guest to obtain information
about a queue. It uses the following structure for communicating:
struct vq_config_block {
- __u16 index;
- __u16 max_num;
+ be16 index;
+ be16 max_num;
} __attribute__ ((packed));
The requested number of buffers for queue index is returned in
@@ -1811,12 +1815,12 @@ host about the location used for its queue. The transmitted
structure is
struct vq_info_block {
- __u64 desc;
- __u32 res0;
- __u16 index;
- __u16 num;
- __u64 avail;
- __u64 used;
+ be64 desc;
+ be32 res0;
+ be16 index;
+ be16 num;
+ be64 avail;
+ be64 used;
} __attribute__ ((packed));
desc, avail and used contain the guest addresses for the descriptor table,
@@ -1831,10 +1835,10 @@ For a legacy driver or for a driver that selected revision 0,
CCW_CMD_SET_VQ uses the following communication block:
struct vq_info_block_legacy {
- __u64 queue;
- __u32 align;
- __u16 index;
- __u16 num;
+ be64 queue;
+ be32 align;
+ be16 index;
+ be16 num;
} __attribute__ ((packed));
queue contains the guest address for queue index, num the number of buffers
@@ -1878,8 +1882,8 @@ The CCW commands dealing with features use the following
communication block:
struct virtio_feature_desc {
- __u32 features;
- __u8 index;
+ be32 features;
+ u8 index;
} __attribute__ ((packed));
features are the 32 bits of features currently accessed, while
@@ -1965,10 +1969,10 @@ the driver uses the CCW_CMD_SET_IND_ADAPTER command with the following
payload:
struct virtio_thinint_area {
- __u64 summary_indicator;
- __u64 indicator;
- __u64 bit_nr;
- __u8 isc;
+ be64 summary_indicator;
+ be64 indicator;
+ be64 bit_nr;
+ u8 isc;
} __attribute__ ((packed));
summary_indicator contains the guest address of the 8 bit summary