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* definition for virtio for kvm on s390
* Copyright IBM Corp. 2008
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (version 2 only)
* as published by the Free Software Foundation.
* Author(s): Christian Borntraeger <>
#ifndef __KVM_S390_VIRTIO_H
#define __KVM_S390_VIRTIO_H
#include "standard-headers/linux/types.h"
struct kvm_device_desc {
/* The device type: console, network, disk etc. Type 0 terminates. */
uint8_t type;
/* The number of virtqueues (first in config array) */
uint8_t num_vq;
* The number of bytes of feature bits. Multiply by 2: one for host
* features and one for guest acknowledgements.
uint8_t feature_len;
/* The number of bytes of the config array after virtqueues. */
uint8_t config_len;
/* A status byte, written by the Guest. */
uint8_t status;
uint8_t config[0];
* This is how we expect the device configuration field for a virtqueue
* to be laid out in config space.
struct kvm_vqconfig {
/* The token returned with an interrupt. Set by the guest */
uint64_t token;
/* The address of the virtio ring */
uint64_t address;
/* The number of entries in the virtio_ring */
uint16_t num;
#define KVM_S390_VIRTIO_NOTIFY 0
#define KVM_S390_VIRTIO_RESET 1
/* The alignment to use between consumer and producer parts of vring.
* This is pagesize for historical reasons. */
#define KVM_S390_VIRTIO_RING_ALIGN 4096
/* These values are supposed to be in ext_params on an interrupt */
#define VIRTIO_PARAM_MASK 0xff