linux-stable/drivers/s390/crypto/vfio_ap_private.h

35 lines
740 B
C
Raw Normal View History

s390: vfio-ap: base implementation of VFIO AP device driver Introduces a new AP device driver. This device driver is built on the VFIO mediated device framework. The framework provides sysfs interfaces that facilitate passthrough access by guests to devices installed on the linux host. The VFIO AP device driver will serve two purposes: 1. Provide the interfaces to reserve AP devices for exclusive use by KVM guests. This is accomplished by unbinding the devices to be reserved for guest usage from the zcrypt device driver and binding them to the VFIO AP device driver. 2. Implements the functions, callbacks and sysfs attribute interfaces required to create one or more VFIO mediated devices each of which will be used to configure the AP matrix for a guest and serve as a file descriptor for facilitating communication between QEMU and the VFIO AP device driver. When the VFIO AP device driver is initialized: * It registers with the AP bus for control of type 10 (CEX4 and newer) AP queue devices. This limitation was imposed due to: 1. A desire to keep the code as simple as possible; 2. Some older models are no longer supported by the kernel and others are getting close to end of service. 3. A lack of older systems on which to test older devices. The probe and remove callbacks will be provided to support the binding/unbinding of AP queue devices to/from the VFIO AP device driver. * Creates a matrix device, /sys/devices/vfio_ap/matrix, to serve as the parent of the mediated devices created, one for each guest, and to hold the APQNs of the AP devices bound to the VFIO AP device driver. Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com> Reviewed-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Farhan Ali <alifm@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20180925231641.4954-5-akrowiak@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
2018-09-25 23:16:19 +00:00
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Private data and functions for adjunct processor VFIO matrix driver.
*
* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
*
* Copyright IBM Corp. 2018
*/
#ifndef _VFIO_AP_PRIVATE_H_
#define _VFIO_AP_PRIVATE_H_
#include <linux/types.h>
#include <linux/device.h>
#include <linux/mdev.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include "ap_bus.h"
#define VFIO_AP_MODULE_NAME "vfio_ap"
#define VFIO_AP_DRV_NAME "vfio_ap"
/**
* ap_matrix_dev - the AP matrix device structure
* @device: generic device structure associated with the AP matrix device
*/
struct ap_matrix_dev {
struct device device;
};
extern struct ap_matrix_dev *matrix_dev;
#endif /* _VFIO_AP_PRIVATE_H_ */