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Christian Borntraegere976a2b2008-03-25 18:47:46 +01001/*
2 * kvm_virtio.h - definition for virtio for kvm on s390
3 *
4 * Copyright IBM Corp. 2008
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
11 */
12
13#ifndef __KVM_S390_VIRTIO_H
14#define __KVM_S390_VIRTIO_H
15
16#include <linux/types.h>
17
18struct kvm_device_desc {
19 /* The device type: console, network, disk etc. Type 0 terminates. */
20 __u8 type;
21 /* The number of virtqueues (first in config array) */
22 __u8 num_vq;
23 /*
24 * The number of bytes of feature bits. Multiply by 2: one for host
25 * features and one for guest acknowledgements.
26 */
27 __u8 feature_len;
28 /* The number of bytes of the config array after virtqueues. */
29 __u8 config_len;
30 /* A status byte, written by the Guest. */
31 __u8 status;
32 __u8 config[0];
33};
34
35/*
36 * This is how we expect the device configuration field for a virtqueue
37 * to be laid out in config space.
38 */
39struct kvm_vqconfig {
40 /* The token returned with an interrupt. Set by the guest */
41 __u64 token;
42 /* The address of the virtio ring */
43 __u64 address;
44 /* The number of entries in the virtio_ring */
45 __u16 num;
46
47};
48
49#define KVM_S390_VIRTIO_NOTIFY 0
50#define KVM_S390_VIRTIO_RESET 1
51#define KVM_S390_VIRTIO_SET_STATUS 2
52
Rusty Russelldb405982008-12-30 09:26:02 -060053/* The alignment to use between consumer and producer parts of vring.
54 * This is pagesize for historical reasons. */
55#define KVM_S390_VIRTIO_RING_ALIGN 4096
56
Alexander Graffc678d62010-08-24 15:48:50 +020057
58/* These values are supposed to be in ext_params on an interrupt */
59#define VIRTIO_PARAM_MASK 0xff
60#define VIRTIO_PARAM_VRING_INTERRUPT 0x0
61#define VIRTIO_PARAM_CONFIG_CHANGED 0x1
Alexander Grafcefa33e2010-08-24 15:48:51 +020062#define VIRTIO_PARAM_DEV_ADD 0x2
Alexander Graffc678d62010-08-24 15:48:50 +020063
Christian Borntraegere976a2b2008-03-25 18:47:46 +010064#endif