arch/s390/include/asm/kvm_virtio.h

   1 /*
   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
  18 struct 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  */
  39 struct 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
  53 /* 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
  57 #endif