65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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* definition for virtio for kvm on s390
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*
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* Copyright IBM Corp. 2008
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*
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* Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
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*/
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#ifndef __KVM_S390_VIRTIO_H
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#define __KVM_S390_VIRTIO_H
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#include "standard-headers/linux/types.h"
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struct kvm_device_desc {
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/* The device type: console, network, disk etc. Type 0 terminates. */
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uint8_t type;
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/* The number of virtqueues (first in config array) */
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uint8_t num_vq;
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/*
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* The number of bytes of feature bits. Multiply by 2: one for host
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* features and one for guest acknowledgements.
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*/
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uint8_t feature_len;
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/* The number of bytes of the config array after virtqueues. */
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uint8_t config_len;
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/* A status byte, written by the Guest. */
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uint8_t status;
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uint8_t config[0];
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};
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/*
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* This is how we expect the device configuration field for a virtqueue
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* to be laid out in config space.
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*/
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struct kvm_vqconfig {
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/* The token returned with an interrupt. Set by the guest */
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uint64_t token;
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/* The address of the virtio ring */
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uint64_t address;
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/* The number of entries in the virtio_ring */
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uint16_t num;
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};
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#define KVM_S390_VIRTIO_NOTIFY 0
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#define KVM_S390_VIRTIO_RESET 1
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#define KVM_S390_VIRTIO_SET_STATUS 2
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/* The alignment to use between consumer and producer parts of vring.
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* This is pagesize for historical reasons. */
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#define KVM_S390_VIRTIO_RING_ALIGN 4096
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/* These values are supposed to be in ext_params on an interrupt */
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#define VIRTIO_PARAM_MASK 0xff
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#define VIRTIO_PARAM_VRING_INTERRUPT 0x0
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#define VIRTIO_PARAM_CONFIG_CHANGED 0x1
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#define VIRTIO_PARAM_DEV_ADD 0x2
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#endif
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