mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 13:14:07 +08:00
5ea5ca3c2b
Current usage of kvm_io_device requires users to destruct it with an extra call of kvm_iodevice_destructor after the device gets unregistered from kvm_io_bus. This is not necessary and can cause errors if a user forgot to make the extra call. Simplify the usage by combining kvm_iodevice_destructor into kvm_io_bus_unregister_dev. This reduces LOCs a bit for users and can avoid the leakage of destructing the device explicitly. Signed-off-by: Wei Wang <wei.w.wang@intel.com> Reviewed-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20230207123713.3905-2-wei.w.wang@intel.com Signed-off-by: Sean Christopherson <seanjc@google.com>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
|
|
#ifndef __KVM_IODEV_H__
|
|
#define __KVM_IODEV_H__
|
|
|
|
#include <linux/kvm_types.h>
|
|
#include <linux/errno.h>
|
|
|
|
struct kvm_io_device;
|
|
struct kvm_vcpu;
|
|
|
|
/**
|
|
* 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_vcpu *vcpu,
|
|
struct kvm_io_device *this,
|
|
gpa_t addr,
|
|
int len,
|
|
void *val);
|
|
int (*write)(struct kvm_vcpu *vcpu,
|
|
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_vcpu *vcpu,
|
|
struct kvm_io_device *dev, gpa_t addr,
|
|
int l, void *v)
|
|
{
|
|
return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v)
|
|
: -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu,
|
|
struct kvm_io_device *dev, gpa_t addr,
|
|
int l, const void *v)
|
|
{
|
|
return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v)
|
|
: -EOPNOTSUPP;
|
|
}
|
|
|
|
#endif /* __KVM_IODEV_H__ */
|