text: /*
   * 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 <borntraeger@de.ibm.com>
   */
  
  #ifndef __KVM_S390_VIRTIO_H
  #define __KVM_S390_VIRTIO_H
  
  #include <linux/types.h>
  
  struct kvm_device_desc {
  	/* The device type: console, network, disk etc.  Type 0 terminates. */
  	__u8 type;
  	/* The number of virtqueues (first in config array) */
  	__u8 num_vq;
  	/*
  	 * The number of bytes of feature bits.  Multiply by 2: one for host
  	 * features and one for guest acknowledgements.
  	 */
  	__u8 feature_len;
  	/* The number of bytes of the config array after virtqueues. */
  	__u8 config_len;
  	/* A status byte, written by the Guest. */
  	__u8 status;
  	__u8 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 */
  	__u64 token;
  	/* The address of the virtio ring */
  	__u64 address;
  	/* The number of entries in the virtio_ring */
  	__u16 num;
  
  };
  
  #define KVM_S390_VIRTIO_NOTIFY		0
  #define KVM_S390_VIRTIO_RESET		1
  #define KVM_S390_VIRTIO_SET_STATUS	2
  
  /* 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
  #define VIRTIO_PARAM_VRING_INTERRUPT	0x0
  #define VIRTIO_PARAM_CONFIG_CHANGED	0x1
  #define VIRTIO_PARAM_DEV_ADD		0x2
  
  #endif
  