forked from Minki/linux
cefa33e2f8
The one big missing feature in s390-virtio was hotplugging. This is no more. This patch implements hotplug add support, so you can on the fly add new devices in the guest. Keep in mind that this needs a patch for qemu to actually leverage the functionality. Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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* kvm_virtio.h - 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 <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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__u8 type;
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/* The number of virtqueues (first in config array) */
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__u8 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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__u8 feature_len;
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/* The number of bytes of the config array after virtqueues. */
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__u8 config_len;
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/* A status byte, written by the Guest. */
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__u8 status;
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__u8 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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__u64 token;
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/* The address of the virtio ring */
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__u64 address;
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/* The number of entries in the virtio_ring */
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__u16 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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