mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
bda9020e24
This changes bus accesses to use high-level kvm_io_bus_read/kvm_io_bus_write functions. in_range now becomes unused so it is removed from device ops in favor of read/write callbacks performing range checks internally. This allows aliasing (mostly for in-kernel virtio), as well as better error handling by making it possible to pass errors up to userspace. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef __KVM_IODEV_H__
|
|
#define __KVM_IODEV_H__
|
|
|
|
#include <linux/kvm_types.h>
|
|
#include <asm/errno.h>
|
|
|
|
struct kvm_io_device;
|
|
|
|
/**
|
|
* kvm_io_device_ops are called under kvm slots_lock.
|
|
* read and write handlers return 0 if the transaction has been handled,
|
|
* or non-zero to have it passed to the next device.
|
|
**/
|
|
struct kvm_io_device_ops {
|
|
int (*read)(struct kvm_io_device *this,
|
|
gpa_t addr,
|
|
int len,
|
|
void *val);
|
|
int (*write)(struct kvm_io_device *this,
|
|
gpa_t addr,
|
|
int len,
|
|
const void *val);
|
|
void (*destructor)(struct kvm_io_device *this);
|
|
};
|
|
|
|
|
|
struct kvm_io_device {
|
|
const struct kvm_io_device_ops *ops;
|
|
};
|
|
|
|
static inline void kvm_iodevice_init(struct kvm_io_device *dev,
|
|
const struct kvm_io_device_ops *ops)
|
|
{
|
|
dev->ops = ops;
|
|
}
|
|
|
|
static inline int kvm_iodevice_read(struct kvm_io_device *dev,
|
|
gpa_t addr, int l, void *v)
|
|
{
|
|
return dev->ops->read ? dev->ops->read(dev, addr, l, v) : -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int kvm_iodevice_write(struct kvm_io_device *dev,
|
|
gpa_t addr, int l, const void *v)
|
|
{
|
|
return dev->ops->write ? dev->ops->write(dev, addr, l, v) : -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
|
|
{
|
|
if (dev->ops->destructor)
|
|
dev->ops->destructor(dev);
|
|
}
|
|
|
|
#endif /* __KVM_IODEV_H__ */
|