mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 12:09:58 +00:00
441ea695f9
The guest side must not manipulate the index for the used buffers. Instead, remember the state of the used buffer locally and wait until it has moved. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
165 lines
4.0 KiB
C
165 lines
4.0 KiB
C
/*
|
|
* Virtio driver bits
|
|
*
|
|
* Copyright (c) 2013 Alexander Graf <agraf@suse.de>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or (at
|
|
* your option) any later version. See the COPYING file in the top-level
|
|
* directory.
|
|
*/
|
|
|
|
#ifndef VIRTIO_H
|
|
#define VIRTIO_H
|
|
|
|
#include "s390-ccw.h"
|
|
|
|
/* Status byte for guest to report progress, and synchronize features. */
|
|
/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
|
|
#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
|
|
/* We have found a driver for the device. */
|
|
#define VIRTIO_CONFIG_S_DRIVER 2
|
|
/* Driver has used its parts of the config, and is happy */
|
|
#define VIRTIO_CONFIG_S_DRIVER_OK 4
|
|
/* We've given up on this device. */
|
|
#define VIRTIO_CONFIG_S_FAILED 0x80
|
|
|
|
enum virtio_dev_type {
|
|
VIRTIO_ID_NET = 1,
|
|
VIRTIO_ID_BLOCK = 2,
|
|
VIRTIO_ID_CONSOLE = 3,
|
|
VIRTIO_ID_BALLOON = 5,
|
|
};
|
|
|
|
struct virtio_dev_header {
|
|
enum virtio_dev_type type : 8;
|
|
u8 num_vq;
|
|
u8 feature_len;
|
|
u8 config_len;
|
|
u8 status;
|
|
u8 vqconfig[];
|
|
} __attribute__((packed));
|
|
|
|
struct virtio_vqconfig {
|
|
u64 token;
|
|
u64 address;
|
|
u16 num;
|
|
u8 pad[6];
|
|
} __attribute__((packed));
|
|
|
|
struct vq_info_block {
|
|
u64 queue;
|
|
u32 align;
|
|
u16 index;
|
|
u16 num;
|
|
} __attribute__((packed));
|
|
|
|
struct vq_config_block {
|
|
u16 index;
|
|
u16 num;
|
|
} __attribute__((packed));
|
|
|
|
struct virtio_dev {
|
|
struct virtio_dev_header *header;
|
|
struct virtio_vqconfig *vqconfig;
|
|
char *host_features;
|
|
char *guest_features;
|
|
char *config;
|
|
};
|
|
|
|
#define KVM_S390_VIRTIO_RING_ALIGN 4096
|
|
|
|
#define VRING_USED_F_NO_NOTIFY 1
|
|
|
|
/* This marks a buffer as continuing via the next field. */
|
|
#define VRING_DESC_F_NEXT 1
|
|
/* This marks a buffer as write-only (otherwise read-only). */
|
|
#define VRING_DESC_F_WRITE 2
|
|
/* This means the buffer contains a list of buffer descriptors. */
|
|
#define VRING_DESC_F_INDIRECT 4
|
|
|
|
/* Internal flag to mark follow-up segments as such */
|
|
#define VRING_HIDDEN_IS_CHAIN 256
|
|
|
|
/* Virtio ring descriptors: 16 bytes. These can chain together via "next". */
|
|
struct vring_desc {
|
|
/* Address (guest-physical). */
|
|
u64 addr;
|
|
/* Length. */
|
|
u32 len;
|
|
/* The flags as indicated above. */
|
|
u16 flags;
|
|
/* We chain unused descriptors via this, too */
|
|
u16 next;
|
|
} __attribute__((packed));
|
|
|
|
struct vring_avail {
|
|
u16 flags;
|
|
u16 idx;
|
|
u16 ring[];
|
|
} __attribute__((packed));
|
|
|
|
/* u32 is used here for ids for padding reasons. */
|
|
struct vring_used_elem {
|
|
/* Index of start of used descriptor chain. */
|
|
u32 id;
|
|
/* Total length of the descriptor chain which was used (written to) */
|
|
u32 len;
|
|
} __attribute__((packed));
|
|
|
|
struct vring_used {
|
|
u16 flags;
|
|
u16 idx;
|
|
struct vring_used_elem ring[];
|
|
} __attribute__((packed));
|
|
|
|
struct vring {
|
|
unsigned int num;
|
|
int next_idx;
|
|
int used_idx;
|
|
struct vring_desc *desc;
|
|
struct vring_avail *avail;
|
|
struct vring_used *used;
|
|
struct subchannel_id schid;
|
|
};
|
|
|
|
|
|
/***********************************************
|
|
* Virtio block *
|
|
***********************************************/
|
|
|
|
/*
|
|
* Command types
|
|
*
|
|
* Usage is a bit tricky as some bits are used as flags and some are not.
|
|
*
|
|
* Rules:
|
|
* VIRTIO_BLK_T_OUT may be combined with VIRTIO_BLK_T_SCSI_CMD or
|
|
* VIRTIO_BLK_T_BARRIER. VIRTIO_BLK_T_FLUSH is a command of its own
|
|
* and may not be combined with any of the other flags.
|
|
*/
|
|
|
|
/* These two define direction. */
|
|
#define VIRTIO_BLK_T_IN 0
|
|
#define VIRTIO_BLK_T_OUT 1
|
|
|
|
/* This bit says it's a scsi command, not an actual read or write. */
|
|
#define VIRTIO_BLK_T_SCSI_CMD 2
|
|
|
|
/* Cache flush command */
|
|
#define VIRTIO_BLK_T_FLUSH 4
|
|
|
|
/* Barrier before this op. */
|
|
#define VIRTIO_BLK_T_BARRIER 0x80000000
|
|
|
|
/* This is the first element of the read scatter-gather list. */
|
|
struct virtio_blk_outhdr {
|
|
/* VIRTIO_BLK_T* */
|
|
u32 type;
|
|
/* io priority. */
|
|
u32 ioprio;
|
|
/* Sector (ie. 512 byte offset) */
|
|
u64 sector;
|
|
};
|
|
|
|
#endif /* VIRTIO_H */
|