cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vfio_ap_private.h (3853B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Private data and functions for adjunct processor VFIO matrix driver.
      4 *
      5 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
      6 *	      Halil Pasic <pasic@linux.ibm.com>
      7 *	      Pierre Morel <pmorel@linux.ibm.com>
      8 *
      9 * Copyright IBM Corp. 2018
     10 */
     11
     12#ifndef _VFIO_AP_PRIVATE_H_
     13#define _VFIO_AP_PRIVATE_H_
     14
     15#include <linux/types.h>
     16#include <linux/device.h>
     17#include <linux/mdev.h>
     18#include <linux/delay.h>
     19#include <linux/mutex.h>
     20#include <linux/kvm_host.h>
     21#include <linux/vfio.h>
     22
     23#include "ap_bus.h"
     24
     25#define VFIO_AP_MODULE_NAME "vfio_ap"
     26#define VFIO_AP_DRV_NAME "vfio_ap"
     27
     28/**
     29 * struct ap_matrix_dev - Contains the data for the matrix device.
     30 *
     31 * @device:	generic device structure associated with the AP matrix device
     32 * @available_instances: number of mediated matrix devices that can be created
     33 * @info:	the struct containing the output from the PQAP(QCI) instruction
     34 * @mdev_list:	the list of mediated matrix devices created
     35 * @lock:	mutex for locking the AP matrix device. This lock will be
     36 *		taken every time we fiddle with state managed by the vfio_ap
     37 *		driver, be it using @mdev_list or writing the state of a
     38 *		single ap_matrix_mdev device. It's quite coarse but we don't
     39 *		expect much contention.
     40 * @vfio_ap_drv: the vfio_ap device driver
     41 */
     42struct ap_matrix_dev {
     43	struct device device;
     44	atomic_t available_instances;
     45	struct ap_config_info info;
     46	struct list_head mdev_list;
     47	struct mutex lock;
     48	struct ap_driver  *vfio_ap_drv;
     49};
     50
     51extern struct ap_matrix_dev *matrix_dev;
     52
     53/**
     54 * struct ap_matrix - matrix of adapters, domains and control domains
     55 *
     56 * @apm_max: max adapter number in @apm
     57 * @apm: identifies the AP adapters in the matrix
     58 * @aqm_max: max domain number in @aqm
     59 * @aqm: identifies the AP queues (domains) in the matrix
     60 * @adm_max: max domain number in @adm
     61 * @adm: identifies the AP control domains in the matrix
     62 *
     63 * The AP matrix is comprised of three bit masks identifying the adapters,
     64 * queues (domains) and control domains that belong to an AP matrix. The bits in
     65 * each mask, from left to right, correspond to IDs 0 to 255. When a bit is set
     66 * the corresponding ID belongs to the matrix.
     67 */
     68struct ap_matrix {
     69	unsigned long apm_max;
     70	DECLARE_BITMAP(apm, 256);
     71	unsigned long aqm_max;
     72	DECLARE_BITMAP(aqm, 256);
     73	unsigned long adm_max;
     74	DECLARE_BITMAP(adm, 256);
     75};
     76
     77/**
     78 * struct ap_matrix_mdev - Contains the data associated with a matrix mediated
     79 *			   device.
     80 * @vdev:	the vfio device
     81 * @node:	allows the ap_matrix_mdev struct to be added to a list
     82 * @matrix:	the adapters, usage domains and control domains assigned to the
     83 *		mediated matrix device.
     84 * @iommu_notifier: notifier block used for specifying callback function for
     85 *		    handling the VFIO_IOMMU_NOTIFY_DMA_UNMAP even
     86 * @kvm:	the struct holding guest's state
     87 * @pqap_hook:	the function pointer to the interception handler for the
     88 *		PQAP(AQIC) instruction.
     89 * @mdev:	the mediated device
     90 */
     91struct ap_matrix_mdev {
     92	struct vfio_device vdev;
     93	struct list_head node;
     94	struct ap_matrix matrix;
     95	struct notifier_block iommu_notifier;
     96	struct kvm *kvm;
     97	crypto_hook pqap_hook;
     98	struct mdev_device *mdev;
     99};
    100
    101/**
    102 * struct vfio_ap_queue - contains the data associated with a queue bound to the
    103 *			  vfio_ap device driver
    104 * @matrix_mdev: the matrix mediated device
    105 * @saved_pfn: the guest PFN pinned for the guest
    106 * @apqn: the APQN of the AP queue device
    107 * @saved_isc: the guest ISC registered with the GIB interface
    108 */
    109struct vfio_ap_queue {
    110	struct ap_matrix_mdev *matrix_mdev;
    111	unsigned long saved_pfn;
    112	int	apqn;
    113#define VFIO_AP_ISC_INVALID 0xff
    114	unsigned char saved_isc;
    115};
    116
    117int vfio_ap_mdev_register(void);
    118void vfio_ap_mdev_unregister(void);
    119int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q,
    120			     unsigned int retry);
    121
    122#endif /* _VFIO_AP_PRIVATE_H_ */