linux/include/asm-s390/kvm_virtio.h
Christian Borntraeger faeba830b0 s390: use virtio_console for KVM on s390
This patch enables virtio_console as the default console on kvm for
s390. We currently use the same notify hack as lguest for early
console output. I will try to address this for lguest and s390 later.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2008-07-25 12:06:07 +10:00

64 lines
1.6 KiB
C

/*
* kvm_virtio.h - 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
#ifdef __KERNEL__
/* early virtio console setup */
#ifdef CONFIG_VIRTIO_CONSOLE
extern void s390_virtio_console_init(void);
#else
static inline void s390_virtio_console_init(void)
{
}
#endif /* CONFIG_VIRTIO_CONSOLE */
#endif /* __KERNEL__ */
#endif