vfio_ap_ops.c 34.7 KB
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// SPDX-License-Identifier: GPL-2.0+
/*
 * Adjunct processor matrix VFIO device driver callbacks.
 *
 * Copyright IBM Corp. 2018
 *
 * Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
 *	      Halil Pasic <pasic@linux.ibm.com>
 *	      Pierre Morel <pmorel@linux.ibm.com>
 */
#include <linux/string.h>
#include <linux/vfio.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/ctype.h>
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#include <linux/bitops.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <asm/kvm.h>
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#include <asm/zcrypt.h>

#include "vfio_ap_private.h"

#define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
#define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"

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static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev);
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static struct vfio_ap_queue *vfio_ap_find_queue(int apqn);
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static int match_apqn(struct device *dev, const void *data)
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{
	struct vfio_ap_queue *q = dev_get_drvdata(dev);

	return (q->apqn == *(int *)(data)) ? 1 : 0;
}

/**
 * vfio_ap_get_queue: Retrieve a queue with a specific APQN from a list
 * @matrix_mdev: the associated mediated matrix
 * @apqn: The queue APQN
 *
 * Retrieve a queue with a specific APQN from the list of the
 * devices of the vfio_ap_drv.
 * Verify that the APID and the APQI are set in the matrix.
 *
 * Returns the pointer to the associated vfio_ap_queue
 */
static struct vfio_ap_queue *vfio_ap_get_queue(
					struct ap_matrix_mdev *matrix_mdev,
					int apqn)
{
	struct vfio_ap_queue *q;

	if (!test_bit_inv(AP_QID_CARD(apqn), matrix_mdev->matrix.apm))
		return NULL;
	if (!test_bit_inv(AP_QID_QUEUE(apqn), matrix_mdev->matrix.aqm))
		return NULL;

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	q = vfio_ap_find_queue(apqn);
	if (q)
		q->matrix_mdev = matrix_mdev;
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	return q;
}

/**
 * vfio_ap_wait_for_irqclear
 * @apqn: The AP Queue number
 *
 * Checks the IRQ bit for the status of this APQN using ap_tapq.
 * Returns if the ap_tapq function succeeded and the bit is clear.
 * Returns if ap_tapq function failed with invalid, deconfigured or
 * checkstopped AP.
 * Otherwise retries up to 5 times after waiting 20ms.
 *
 */
static void vfio_ap_wait_for_irqclear(int apqn)
{
	struct ap_queue_status status;
	int retry = 5;

	do {
		status = ap_tapq(apqn, NULL);
		switch (status.response_code) {
		case AP_RESPONSE_NORMAL:
		case AP_RESPONSE_RESET_IN_PROGRESS:
			if (!status.irq_enabled)
				return;
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			fallthrough;
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		case AP_RESPONSE_BUSY:
			msleep(20);
			break;
		case AP_RESPONSE_Q_NOT_AVAIL:
		case AP_RESPONSE_DECONFIGURED:
		case AP_RESPONSE_CHECKSTOPPED:
		default:
			WARN_ONCE(1, "%s: tapq rc %02x: %04x\n", __func__,
				  status.response_code, apqn);
			return;
		}
	} while (--retry);

	WARN_ONCE(1, "%s: tapq rc %02x: %04x could not clear IR bit\n",
		  __func__, status.response_code, apqn);
}

/**
 * vfio_ap_free_aqic_resources
 * @q: The vfio_ap_queue
 *
 * Unregisters the ISC in the GIB when the saved ISC not invalid.
 * Unpin the guest's page holding the NIB when it exist.
 * Reset the saved_pfn and saved_isc to invalid values.
 *
 */
static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
{
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	if (!q)
		return;
	if (q->saved_isc != VFIO_AP_ISC_INVALID &&
	    !WARN_ON(!(q->matrix_mdev && q->matrix_mdev->kvm))) {
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		kvm_s390_gisc_unregister(q->matrix_mdev->kvm, q->saved_isc);
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		q->saved_isc = VFIO_AP_ISC_INVALID;
	}
	if (q->saved_pfn && !WARN_ON(!q->matrix_mdev)) {
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		vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev),
				 &q->saved_pfn, 1);
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		q->saved_pfn = 0;
	}
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}

/**
 * vfio_ap_irq_disable
 * @q: The vfio_ap_queue
 *
 * Uses ap_aqic to disable the interruption and in case of success, reset
 * in progress or IRQ disable command already proceeded: calls
 * vfio_ap_wait_for_irqclear() to check for the IRQ bit to be clear
 * and calls vfio_ap_free_aqic_resources() to free the resources associated
 * with the AP interrupt handling.
 *
 * In the case the AP is busy, or a reset is in progress,
 * retries after 20ms, up to 5 times.
 *
 * Returns if ap_aqic function failed with invalid, deconfigured or
 * checkstopped AP.
 */
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static struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q)
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{
	struct ap_qirq_ctrl aqic_gisa = {};
	struct ap_queue_status status;
	int retries = 5;

	do {
		status = ap_aqic(q->apqn, aqic_gisa, NULL);
		switch (status.response_code) {
		case AP_RESPONSE_OTHERWISE_CHANGED:
		case AP_RESPONSE_NORMAL:
			vfio_ap_wait_for_irqclear(q->apqn);
			goto end_free;
		case AP_RESPONSE_RESET_IN_PROGRESS:
		case AP_RESPONSE_BUSY:
			msleep(20);
			break;
		case AP_RESPONSE_Q_NOT_AVAIL:
		case AP_RESPONSE_DECONFIGURED:
		case AP_RESPONSE_CHECKSTOPPED:
		case AP_RESPONSE_INVALID_ADDRESS:
		default:
			/* All cases in default means AP not operational */
			WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__,
				  status.response_code);
			goto end_free;
		}
	} while (retries--);

	WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__,
		  status.response_code);
end_free:
	vfio_ap_free_aqic_resources(q);
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	q->matrix_mdev = NULL;
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	return status;
}

/**
 * vfio_ap_setirq: Enable Interruption for a APQN
 *
 * @dev: the device associated with the ap_queue
 * @q:	 the vfio_ap_queue holding AQIC parameters
 *
 * Pin the NIB saved in *q
 * Register the guest ISC to GIB interface and retrieve the
 * host ISC to issue the host side PQAP/AQIC
 *
 * Response.status may be set to AP_RESPONSE_INVALID_ADDRESS in case the
 * vfio_pin_pages failed.
 *
 * Otherwise return the ap_queue_status returned by the ap_aqic(),
 * all retry handling will be done by the guest.
 */
static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
						 int isc,
						 unsigned long nib)
{
	struct ap_qirq_ctrl aqic_gisa = {};
	struct ap_queue_status status = {};
	struct kvm_s390_gisa *gisa;
	struct kvm *kvm;
	unsigned long h_nib, g_pfn, h_pfn;
	int ret;

	g_pfn = nib >> PAGE_SHIFT;
	ret = vfio_pin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1,
			     IOMMU_READ | IOMMU_WRITE, &h_pfn);
	switch (ret) {
	case 1:
		break;
	default:
		status.response_code = AP_RESPONSE_INVALID_ADDRESS;
		return status;
	}

	kvm = q->matrix_mdev->kvm;
	gisa = kvm->arch.gisa_int.origin;

	h_nib = (h_pfn << PAGE_SHIFT) | (nib & ~PAGE_MASK);
	aqic_gisa.gisc = isc;
	aqic_gisa.isc = kvm_s390_gisc_register(kvm, isc);
	aqic_gisa.ir = 1;
	aqic_gisa.gisa = (uint64_t)gisa >> 4;

	status = ap_aqic(q->apqn, aqic_gisa, (void *)h_nib);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		/* See if we did clear older IRQ configuration */
		vfio_ap_free_aqic_resources(q);
		q->saved_pfn = g_pfn;
		q->saved_isc = isc;
		break;
	case AP_RESPONSE_OTHERWISE_CHANGED:
		/* We could not modify IRQ setings: clear new configuration */
		vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1);
		kvm_s390_gisc_unregister(kvm, isc);
		break;
	default:
		pr_warn("%s: apqn %04x: response: %02x\n", __func__, q->apqn,
			status.response_code);
		vfio_ap_irq_disable(q);
		break;
	}

	return status;
}

/**
 * handle_pqap: PQAP instruction callback
 *
 * @vcpu: The vcpu on which we received the PQAP instruction
 *
 * Get the general register contents to initialize internal variables.
 * REG[0]: APQN
 * REG[1]: IR and ISC
 * REG[2]: NIB
 *
 * Response.status may be set to following Response Code:
 * - AP_RESPONSE_Q_NOT_AVAIL: if the queue is not available
 * - AP_RESPONSE_DECONFIGURED: if the queue is not configured
 * - AP_RESPONSE_NORMAL (0) : in case of successs
 *   Check vfio_ap_setirq() and vfio_ap_clrirq() for other possible RC.
 * We take the matrix_dev lock to ensure serialization on queues and
 * mediated device access.
 *
 * Return 0 if we could handle the request inside KVM.
 * otherwise, returns -EOPNOTSUPP to let QEMU handle the fault.
 */
static int handle_pqap(struct kvm_vcpu *vcpu)
{
	uint64_t status;
	uint16_t apqn;
	struct vfio_ap_queue *q;
	struct ap_queue_status qstatus = {
			       .response_code = AP_RESPONSE_Q_NOT_AVAIL, };
	struct ap_matrix_mdev *matrix_mdev;

	/* If we do not use the AIV facility just go to userland */
	if (!(vcpu->arch.sie_block->eca & ECA_AIV))
		return -EOPNOTSUPP;

	apqn = vcpu->run->s.regs.gprs[0] & 0xffff;
	mutex_lock(&matrix_dev->lock);

	if (!vcpu->kvm->arch.crypto.pqap_hook)
		goto out_unlock;
	matrix_mdev = container_of(vcpu->kvm->arch.crypto.pqap_hook,
				   struct ap_matrix_mdev, pqap_hook);

	q = vfio_ap_get_queue(matrix_mdev, apqn);
	if (!q)
		goto out_unlock;

	status = vcpu->run->s.regs.gprs[1];

	/* If IR bit(16) is set we enable the interrupt */
	if ((status >> (63 - 16)) & 0x01)
		qstatus = vfio_ap_irq_enable(q, status & 0x07,
					     vcpu->run->s.regs.gprs[2]);
	else
		qstatus = vfio_ap_irq_disable(q);

out_unlock:
	memcpy(&vcpu->run->s.regs.gprs[1], &qstatus, sizeof(qstatus));
	vcpu->run->s.regs.gprs[1] >>= 32;
	mutex_unlock(&matrix_dev->lock);
	return 0;
}

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static void vfio_ap_matrix_init(struct ap_config_info *info,
				struct ap_matrix *matrix)
{
	matrix->apm_max = info->apxa ? info->Na : 63;
	matrix->aqm_max = info->apxa ? info->Nd : 15;
	matrix->adm_max = info->apxa ? info->Nd : 15;
}

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static int vfio_ap_mdev_create(struct mdev_device *mdev)
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{
	struct ap_matrix_mdev *matrix_mdev;

	if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))
		return -EPERM;

	matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);
	if (!matrix_mdev) {
		atomic_inc(&matrix_dev->available_instances);
		return -ENOMEM;
	}

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	matrix_mdev->mdev = mdev;
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	vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
	mdev_set_drvdata(mdev, matrix_mdev);
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	matrix_mdev->pqap_hook.hook = handle_pqap;
	matrix_mdev->pqap_hook.owner = THIS_MODULE;
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	mutex_lock(&matrix_dev->lock);
	list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
	mutex_unlock(&matrix_dev->lock);

	return 0;
}

static int vfio_ap_mdev_remove(struct mdev_device *mdev)
{
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

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	if (matrix_mdev->kvm)
		return -EBUSY;

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	mutex_lock(&matrix_dev->lock);
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	vfio_ap_mdev_reset_queues(mdev);
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	list_del(&matrix_mdev->node);
	mutex_unlock(&matrix_dev->lock);

	kfree(matrix_mdev);
	mdev_set_drvdata(mdev, NULL);
	atomic_inc(&matrix_dev->available_instances);

	return 0;
}

static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
{
	return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
}

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static MDEV_TYPE_ATTR_RO(name);
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static ssize_t available_instances_show(struct kobject *kobj,
					struct device *dev, char *buf)
{
	return sprintf(buf, "%d\n",
		       atomic_read(&matrix_dev->available_instances));
}

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static MDEV_TYPE_ATTR_RO(available_instances);
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static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
			       char *buf)
{
	return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
}

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static MDEV_TYPE_ATTR_RO(device_api);
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static struct attribute *vfio_ap_mdev_type_attrs[] = {
	&mdev_type_attr_name.attr,
	&mdev_type_attr_device_api.attr,
	&mdev_type_attr_available_instances.attr,
	NULL,
};

static struct attribute_group vfio_ap_mdev_hwvirt_type_group = {
	.name = VFIO_AP_MDEV_TYPE_HWVIRT,
	.attrs = vfio_ap_mdev_type_attrs,
};

static struct attribute_group *vfio_ap_mdev_type_groups[] = {
	&vfio_ap_mdev_hwvirt_type_group,
	NULL,
};

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struct vfio_ap_queue_reserved {
	unsigned long *apid;
	unsigned long *apqi;
	bool reserved;
};

/**
 * vfio_ap_has_queue
 *
 * @dev: an AP queue device
 * @data: a struct vfio_ap_queue_reserved reference
 *
 * Flags whether the AP queue device (@dev) has a queue ID containing the APQN,
 * apid or apqi specified in @data:
 *
 * - If @data contains both an apid and apqi value, then @data will be flagged
 *   as reserved if the APID and APQI fields for the AP queue device matches
 *
 * - If @data contains only an apid value, @data will be flagged as
 *   reserved if the APID field in the AP queue device matches
 *
 * - If @data contains only an apqi value, @data will be flagged as
 *   reserved if the APQI field in the AP queue device matches
 *
 * Returns 0 to indicate the input to function succeeded. Returns -EINVAL if
 * @data does not contain either an apid or apqi.
 */
static int vfio_ap_has_queue(struct device *dev, void *data)
{
	struct vfio_ap_queue_reserved *qres = data;
	struct ap_queue *ap_queue = to_ap_queue(dev);
	ap_qid_t qid;
	unsigned long id;

	if (qres->apid && qres->apqi) {
		qid = AP_MKQID(*qres->apid, *qres->apqi);
		if (qid == ap_queue->qid)
			qres->reserved = true;
	} else if (qres->apid && !qres->apqi) {
		id = AP_QID_CARD(ap_queue->qid);
		if (id == *qres->apid)
			qres->reserved = true;
	} else if (!qres->apid && qres->apqi) {
		id = AP_QID_QUEUE(ap_queue->qid);
		if (id == *qres->apqi)
			qres->reserved = true;
	} else {
		return -EINVAL;
	}

	return 0;
}

/**
 * vfio_ap_verify_queue_reserved
 *
 * @matrix_dev: a mediated matrix device
 * @apid: an AP adapter ID
 * @apqi: an AP queue index
 *
 * Verifies that the AP queue with @apid/@apqi is reserved by the VFIO AP device
 * driver according to the following rules:
 *
 * - If both @apid and @apqi are not NULL, then there must be an AP queue
 *   device bound to the vfio_ap driver with the APQN identified by @apid and
 *   @apqi
 *
 * - If only @apid is not NULL, then there must be an AP queue device bound
 *   to the vfio_ap driver with an APQN containing @apid
 *
 * - If only @apqi is not NULL, then there must be an AP queue device bound
 *   to the vfio_ap driver with an APQN containing @apqi
 *
 * Returns 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
 */
static int vfio_ap_verify_queue_reserved(unsigned long *apid,
					 unsigned long *apqi)
{
	int ret;
	struct vfio_ap_queue_reserved qres;

	qres.apid = apid;
	qres.apqi = apqi;
	qres.reserved = false;

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	ret = driver_for_each_device(&matrix_dev->vfio_ap_drv->driver, NULL,
				     &qres, vfio_ap_has_queue);
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	if (ret)
		return ret;

	if (qres.reserved)
		return 0;

	return -EADDRNOTAVAIL;
}

static int
vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev,
					     unsigned long apid)
{
	int ret;
	unsigned long apqi;
	unsigned long nbits = matrix_mdev->matrix.aqm_max + 1;

	if (find_first_bit_inv(matrix_mdev->matrix.aqm, nbits) >= nbits)
		return vfio_ap_verify_queue_reserved(&apid, NULL);

	for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, nbits) {
		ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
		if (ret)
			return ret;
	}

	return 0;
}

/**
 * vfio_ap_mdev_verify_no_sharing
 *
 * Verifies that the APQNs derived from the cross product of the AP adapter IDs
 * and AP queue indexes comprising the AP matrix are not configured for another
 * mediated device. AP queue sharing is not allowed.
 *
 * @matrix_mdev: the mediated matrix device
 *
 * Returns 0 if the APQNs are not shared, otherwise; returns -EADDRINUSE.
 */
static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
{
	struct ap_matrix_mdev *lstdev;
	DECLARE_BITMAP(apm, AP_DEVICES);
	DECLARE_BITMAP(aqm, AP_DOMAINS);

	list_for_each_entry(lstdev, &matrix_dev->mdev_list, node) {
		if (matrix_mdev == lstdev)
			continue;

		memset(apm, 0, sizeof(apm));
		memset(aqm, 0, sizeof(aqm));

		/*
		 * We work on full longs, as we can only exclude the leftover
		 * bits in non-inverse order. The leftover is all zeros.
		 */
		if (!bitmap_and(apm, matrix_mdev->matrix.apm,
				lstdev->matrix.apm, AP_DEVICES))
			continue;

		if (!bitmap_and(aqm, matrix_mdev->matrix.aqm,
				lstdev->matrix.aqm, AP_DOMAINS))
			continue;

		return -EADDRINUSE;
	}

	return 0;
}

/**
 * assign_adapter_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's assign_adapter attribute
 * @buf:	a buffer containing the AP adapter number (APID) to
 *		be assigned
 * @count:	the number of bytes in @buf
 *
 * Parses the APID from @buf and sets the corresponding bit in the mediated
 * matrix device's APM.
 *
 * Returns the number of bytes processed if the APID is valid; otherwise,
 * returns one of the following errors:
 *
 *	1. -EINVAL
 *	   The APID is not a valid number
 *
 *	2. -ENODEV
 *	   The APID exceeds the maximum value configured for the system
 *
 *	3. -EADDRNOTAVAIL
 *	   An APQN derived from the cross product of the APID being assigned
 *	   and the APQIs previously assigned is not bound to the vfio_ap device
 *	   driver; or, if no APQIs have yet been assigned, the APID is not
 *	   contained in an APQN bound to the vfio_ap device driver.
 *
 *	4. -EADDRINUSE
 *	   An APQN derived from the cross product of the APID being assigned
 *	   and the APQIs previously assigned is being used by another mediated
 *	   matrix device
 */
static ssize_t assign_adapter_store(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf, size_t count)
{
	int ret;
	unsigned long apid;
	struct mdev_device *mdev = mdev_from_dev(dev);
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

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	/* If the guest is running, disallow assignment of adapter */
	if (matrix_mdev->kvm)
		return -EBUSY;

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	ret = kstrtoul(buf, 0, &apid);
	if (ret)
		return ret;

	if (apid > matrix_mdev->matrix.apm_max)
		return -ENODEV;

	/*
	 * Set the bit in the AP mask (APM) corresponding to the AP adapter
	 * number (APID). The bits in the mask, from most significant to least
	 * significant bit, correspond to APIDs 0-255.
	 */
	mutex_lock(&matrix_dev->lock);

	ret = vfio_ap_mdev_verify_queues_reserved_for_apid(matrix_mdev, apid);
	if (ret)
		goto done;

	set_bit_inv(apid, matrix_mdev->matrix.apm);

	ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
	if (ret)
		goto share_err;

	ret = count;
	goto done;

share_err:
	clear_bit_inv(apid, matrix_mdev->matrix.apm);
done:
	mutex_unlock(&matrix_dev->lock);

	return ret;
}
static DEVICE_ATTR_WO(assign_adapter);

/**
 * unassign_adapter_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's unassign_adapter attribute
 * @buf:	a buffer containing the adapter number (APID) to be unassigned
 * @count:	the number of bytes in @buf
 *
 * Parses the APID from @buf and clears the corresponding bit in the mediated
 * matrix device's APM.
 *
 * Returns the number of bytes processed if the APID is valid; otherwise,
 * returns one of the following errors:
 *	-EINVAL if the APID is not a number
 *	-ENODEV if the APID it exceeds the maximum value configured for the
 *		system
 */
static ssize_t unassign_adapter_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t count)
{
	int ret;
	unsigned long apid;
	struct mdev_device *mdev = mdev_from_dev(dev);
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

675 676 677 678
	/* If the guest is running, disallow un-assignment of adapter */
	if (matrix_mdev->kvm)
		return -EBUSY;

679 680 681 682 683 684 685 686 687 688 689 690 691
	ret = kstrtoul(buf, 0, &apid);
	if (ret)
		return ret;

	if (apid > matrix_mdev->matrix.apm_max)
		return -ENODEV;

	mutex_lock(&matrix_dev->lock);
	clear_bit_inv((unsigned long)apid, matrix_mdev->matrix.apm);
	mutex_unlock(&matrix_dev->lock);

	return count;
}
692
static DEVICE_ATTR_WO(unassign_adapter);
693

694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
static int
vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev,
					     unsigned long apqi)
{
	int ret;
	unsigned long apid;
	unsigned long nbits = matrix_mdev->matrix.apm_max + 1;

	if (find_first_bit_inv(matrix_mdev->matrix.apm, nbits) >= nbits)
		return vfio_ap_verify_queue_reserved(NULL, &apqi);

	for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, nbits) {
		ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
		if (ret)
			return ret;
	}

	return 0;
}

/**
 * assign_domain_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's assign_domain attribute
 * @buf:	a buffer containing the AP queue index (APQI) of the domain to
 *		be assigned
 * @count:	the number of bytes in @buf
 *
 * Parses the APQI from @buf and sets the corresponding bit in the mediated
 * matrix device's AQM.
 *
 * Returns the number of bytes processed if the APQI is valid; otherwise returns
 * one of the following errors:
 *
 *	1. -EINVAL
 *	   The APQI is not a valid number
 *
 *	2. -ENODEV
 *	   The APQI exceeds the maximum value configured for the system
 *
 *	3. -EADDRNOTAVAIL
 *	   An APQN derived from the cross product of the APQI being assigned
 *	   and the APIDs previously assigned is not bound to the vfio_ap device
 *	   driver; or, if no APIDs have yet been assigned, the APQI is not
 *	   contained in an APQN bound to the vfio_ap device driver.
 *
 *	4. -EADDRINUSE
 *	   An APQN derived from the cross product of the APQI being assigned
 *	   and the APIDs previously assigned is being used by another mediated
 *	   matrix device
 */
static ssize_t assign_domain_store(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	int ret;
	unsigned long apqi;
	struct mdev_device *mdev = mdev_from_dev(dev);
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
	unsigned long max_apqi = matrix_mdev->matrix.aqm_max;

756 757 758 759
	/* If the guest is running, disallow assignment of domain */
	if (matrix_mdev->kvm)
		return -EBUSY;

760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787
	ret = kstrtoul(buf, 0, &apqi);
	if (ret)
		return ret;
	if (apqi > max_apqi)
		return -ENODEV;

	mutex_lock(&matrix_dev->lock);

	ret = vfio_ap_mdev_verify_queues_reserved_for_apqi(matrix_mdev, apqi);
	if (ret)
		goto done;

	set_bit_inv(apqi, matrix_mdev->matrix.aqm);

	ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
	if (ret)
		goto share_err;

	ret = count;
	goto done;

share_err:
	clear_bit_inv(apqi, matrix_mdev->matrix.aqm);
done:
	mutex_unlock(&matrix_dev->lock);

	return ret;
}
788
static DEVICE_ATTR_WO(assign_domain);
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816


/**
 * unassign_domain_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's unassign_domain attribute
 * @buf:	a buffer containing the AP queue index (APQI) of the domain to
 *		be unassigned
 * @count:	the number of bytes in @buf
 *
 * Parses the APQI from @buf and clears the corresponding bit in the
 * mediated matrix device's AQM.
 *
 * Returns the number of bytes processed if the APQI is valid; otherwise,
 * returns one of the following errors:
 *	-EINVAL if the APQI is not a number
 *	-ENODEV if the APQI exceeds the maximum value configured for the system
 */
static ssize_t unassign_domain_store(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	int ret;
	unsigned long apqi;
	struct mdev_device *mdev = mdev_from_dev(dev);
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

817 818 819 820
	/* If the guest is running, disallow un-assignment of domain */
	if (matrix_mdev->kvm)
		return -EBUSY;

821 822 823 824 825 826 827 828 829 830 831 832 833
	ret = kstrtoul(buf, 0, &apqi);
	if (ret)
		return ret;

	if (apqi > matrix_mdev->matrix.aqm_max)
		return -ENODEV;

	mutex_lock(&matrix_dev->lock);
	clear_bit_inv((unsigned long)apqi, matrix_mdev->matrix.aqm);
	mutex_unlock(&matrix_dev->lock);

	return count;
}
834
static DEVICE_ATTR_WO(unassign_domain);
835

836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
/**
 * assign_control_domain_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's assign_control_domain attribute
 * @buf:	a buffer containing the domain ID to be assigned
 * @count:	the number of bytes in @buf
 *
 * Parses the domain ID from @buf and sets the corresponding bit in the mediated
 * matrix device's ADM.
 *
 * Returns the number of bytes processed if the domain ID is valid; otherwise,
 * returns one of the following errors:
 *	-EINVAL if the ID is not a number
 *	-ENODEV if the ID exceeds the maximum value configured for the system
 */
static ssize_t assign_control_domain_store(struct device *dev,
					   struct device_attribute *attr,
					   const char *buf, size_t count)
{
	int ret;
	unsigned long id;
	struct mdev_device *mdev = mdev_from_dev(dev);
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

861 862 863 864
	/* If the guest is running, disallow assignment of control domain */
	if (matrix_mdev->kvm)
		return -EBUSY;

865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882
	ret = kstrtoul(buf, 0, &id);
	if (ret)
		return ret;

	if (id > matrix_mdev->matrix.adm_max)
		return -ENODEV;

	/* Set the bit in the ADM (bitmask) corresponding to the AP control
	 * domain number (id). The bits in the mask, from most significant to
	 * least significant, correspond to IDs 0 up to the one less than the
	 * number of control domains that can be assigned.
	 */
	mutex_lock(&matrix_dev->lock);
	set_bit_inv(id, matrix_mdev->matrix.adm);
	mutex_unlock(&matrix_dev->lock);

	return count;
}
883
static DEVICE_ATTR_WO(assign_control_domain);
884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910

/**
 * unassign_control_domain_store
 *
 * @dev:	the matrix device
 * @attr:	the mediated matrix device's unassign_control_domain attribute
 * @buf:	a buffer containing the domain ID to be unassigned
 * @count:	the number of bytes in @buf
 *
 * Parses the domain ID from @buf and clears the corresponding bit in the
 * mediated matrix device's ADM.
 *
 * Returns the number of bytes processed if the domain ID is valid; otherwise,
 * returns one of the following errors:
 *	-EINVAL if the ID is not a number
 *	-ENODEV if the ID exceeds the maximum value configured for the system
 */
static ssize_t unassign_control_domain_store(struct device *dev,
					     struct device_attribute *attr,
					     const char *buf, size_t count)
{
	int ret;
	unsigned long domid;
	struct mdev_device *mdev = mdev_from_dev(dev);
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
	unsigned long max_domid =  matrix_mdev->matrix.adm_max;

911 912 913 914
	/* If the guest is running, disallow un-assignment of control domain */
	if (matrix_mdev->kvm)
		return -EBUSY;

915 916 917 918 919 920 921 922 923 924 925 926
	ret = kstrtoul(buf, 0, &domid);
	if (ret)
		return ret;
	if (domid > max_domid)
		return -ENODEV;

	mutex_lock(&matrix_dev->lock);
	clear_bit_inv(domid, matrix_mdev->matrix.adm);
	mutex_unlock(&matrix_dev->lock);

	return count;
}
927
static DEVICE_ATTR_WO(unassign_control_domain);
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950

static ssize_t control_domains_show(struct device *dev,
				    struct device_attribute *dev_attr,
				    char *buf)
{
	unsigned long id;
	int nchars = 0;
	int n;
	char *bufpos = buf;
	struct mdev_device *mdev = mdev_from_dev(dev);
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
	unsigned long max_domid = matrix_mdev->matrix.adm_max;

	mutex_lock(&matrix_dev->lock);
	for_each_set_bit_inv(id, matrix_mdev->matrix.adm, max_domid + 1) {
		n = sprintf(bufpos, "%04lx\n", id);
		bufpos += n;
		nchars += n;
	}
	mutex_unlock(&matrix_dev->lock);

	return nchars;
}
951
static DEVICE_ATTR_RO(control_domains);
952

953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct mdev_device *mdev = mdev_from_dev(dev);
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
	char *bufpos = buf;
	unsigned long apid;
	unsigned long apqi;
	unsigned long apid1;
	unsigned long apqi1;
	unsigned long napm_bits = matrix_mdev->matrix.apm_max + 1;
	unsigned long naqm_bits = matrix_mdev->matrix.aqm_max + 1;
	int nchars = 0;
	int n;

	apid1 = find_first_bit_inv(matrix_mdev->matrix.apm, napm_bits);
	apqi1 = find_first_bit_inv(matrix_mdev->matrix.aqm, naqm_bits);

	mutex_lock(&matrix_dev->lock);

	if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) {
		for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
			for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
					     naqm_bits) {
				n = sprintf(bufpos, "%02lx.%04lx\n", apid,
					    apqi);
				bufpos += n;
				nchars += n;
			}
		}
	} else if (apid1 < napm_bits) {
		for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
			n = sprintf(bufpos, "%02lx.\n", apid);
			bufpos += n;
			nchars += n;
		}
	} else if (apqi1 < naqm_bits) {
		for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, naqm_bits) {
			n = sprintf(bufpos, ".%04lx\n", apqi);
			bufpos += n;
			nchars += n;
		}
	}

	mutex_unlock(&matrix_dev->lock);

	return nchars;
}
1001
static DEVICE_ATTR_RO(matrix);
1002

1003 1004 1005
static struct attribute *vfio_ap_mdev_attrs[] = {
	&dev_attr_assign_adapter.attr,
	&dev_attr_unassign_adapter.attr,
1006 1007
	&dev_attr_assign_domain.attr,
	&dev_attr_unassign_domain.attr,
1008 1009 1010
	&dev_attr_assign_control_domain.attr,
	&dev_attr_unassign_control_domain.attr,
	&dev_attr_control_domains.attr,
1011
	&dev_attr_matrix.attr,
1012
	NULL,
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
};

static struct attribute_group vfio_ap_mdev_attr_group = {
	.attrs = vfio_ap_mdev_attrs
};

static const struct attribute_group *vfio_ap_mdev_attr_groups[] = {
	&vfio_ap_mdev_attr_group,
	NULL
};

1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
/**
 * vfio_ap_mdev_set_kvm
 *
 * @matrix_mdev: a mediated matrix device
 * @kvm: reference to KVM instance
 *
 * Verifies no other mediated matrix device has @kvm and sets a reference to
 * it in @matrix_mdev->kvm.
 *
 * Return 0 if no other mediated matrix device has a reference to @kvm;
 * otherwise, returns an -EPERM.
 */
static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
				struct kvm *kvm)
{
	struct ap_matrix_mdev *m;

	list_for_each_entry(m, &matrix_dev->mdev_list, node) {
1042
		if ((m != matrix_mdev) && (m->kvm == kvm))
1043 1044 1045 1046
			return -EPERM;
	}

	matrix_mdev->kvm = kvm;
1047 1048
	kvm_get_kvm(kvm);
	kvm->arch.crypto.pqap_hook = &matrix_mdev->pqap_hook;
1049 1050 1051 1052

	return 0;
}

1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
/*
 * vfio_ap_mdev_iommu_notifier: IOMMU notifier callback
 *
 * @nb: The notifier block
 * @action: Action to be taken
 * @data: data associated with the request
 *
 * For an UNMAP request, unpin the guest IOVA (the NIB guest address we
 * pinned before). Other requests are ignored.
 *
 */
static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb,
				       unsigned long action, void *data)
{
	struct ap_matrix_mdev *matrix_mdev;

	matrix_mdev = container_of(nb, struct ap_matrix_mdev, iommu_notifier);

	if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
		struct vfio_iommu_type1_dma_unmap *unmap = data;
		unsigned long g_pfn = unmap->iova >> PAGE_SHIFT;

		vfio_unpin_pages(mdev_dev(matrix_mdev->mdev), &g_pfn, 1);
		return NOTIFY_OK;
	}

	return NOTIFY_DONE;
}

1082 1083 1084 1085 1086 1087 1088 1089 1090
static void vfio_ap_mdev_unset_kvm(struct ap_matrix_mdev *matrix_mdev)
{
	kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
	matrix_mdev->kvm->arch.crypto.pqap_hook = NULL;
	vfio_ap_mdev_reset_queues(matrix_mdev->mdev);
	kvm_put_kvm(matrix_mdev->kvm);
	matrix_mdev->kvm = NULL;
}

1091 1092 1093
static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
				       unsigned long action, void *data)
{
1094
	int ret, notify_rc = NOTIFY_OK;
1095 1096 1097 1098 1099 1100
	struct ap_matrix_mdev *matrix_mdev;

	if (action != VFIO_GROUP_NOTIFY_SET_KVM)
		return NOTIFY_OK;

	matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
1101
	mutex_lock(&matrix_dev->lock);
1102 1103

	if (!data) {
1104 1105 1106
		if (matrix_mdev->kvm)
			vfio_ap_mdev_unset_kvm(matrix_mdev);
		goto notify_done;
1107 1108 1109
	}

	ret = vfio_ap_mdev_set_kvm(matrix_mdev, data);
1110 1111 1112 1113
	if (ret) {
		notify_rc = NOTIFY_DONE;
		goto notify_done;
	}
1114 1115

	/* If there is no CRYCB pointer, then we can't copy the masks */
1116 1117 1118 1119
	if (!matrix_mdev->kvm->arch.crypto.crycbd) {
		notify_rc = NOTIFY_DONE;
		goto notify_done;
	}
1120

1121 1122 1123
	kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
				  matrix_mdev->matrix.aqm,
				  matrix_mdev->matrix.adm);
1124

1125 1126 1127
notify_done:
	mutex_unlock(&matrix_dev->lock);
	return notify_rc;
1128 1129
}

1130
static struct vfio_ap_queue *vfio_ap_find_queue(int apqn)
1131 1132
{
	struct device *dev;
1133
	struct vfio_ap_queue *q = NULL;
1134 1135 1136 1137 1138 1139 1140

	dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
				 &apqn, match_apqn);
	if (dev) {
		q = dev_get_drvdata(dev);
		put_device(dev);
	}
1141 1142

	return q;
1143 1144
}

1145
int vfio_ap_mdev_reset_queue(struct vfio_ap_queue *q,
1146
			     unsigned int retry)
1147 1148
{
	struct ap_queue_status status;
1149
	int ret;
1150
	int retry2 = 2;
1151

1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
	if (!q)
		return 0;

retry_zapq:
	status = ap_zapq(q->apqn);
	switch (status.response_code) {
	case AP_RESPONSE_NORMAL:
		ret = 0;
		break;
	case AP_RESPONSE_RESET_IN_PROGRESS:
		if (retry--) {
1163
			msleep(20);
1164
			goto retry_zapq;
1165
		}
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
		ret = -EBUSY;
		break;
	case AP_RESPONSE_Q_NOT_AVAIL:
	case AP_RESPONSE_DECONFIGURED:
	case AP_RESPONSE_CHECKSTOPPED:
		WARN_ON_ONCE(status.irq_enabled);
		ret = -EBUSY;
		goto free_resources;
	default:
		/* things are really broken, give up */
		WARN(true, "PQAP/ZAPQ completed with invalid rc (%x)\n",
		     status.response_code);
		return -EIO;
	}

	/* wait for the reset to take effect */
	while (retry2--) {
		if (status.queue_empty && !status.irq_enabled)
			break;
		msleep(20);
		status = ap_tapq(q->apqn, NULL);
	}
	WARN_ON_ONCE(retry2 <= 0);
1189

1190 1191 1192 1193
free_resources:
	vfio_ap_free_aqic_resources(q);

	return ret;
1194 1195 1196 1197 1198 1199 1200
}

static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
{
	int ret;
	int rc = 0;
	unsigned long apid, apqi;
1201
	struct vfio_ap_queue *q;
1202 1203 1204 1205 1206 1207
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

	for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,
			     matrix_mdev->matrix.apm_max + 1) {
		for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
				     matrix_mdev->matrix.aqm_max + 1) {
1208 1209
			q = vfio_ap_find_queue(AP_MKQID(apid, apqi));
			ret = vfio_ap_mdev_reset_queue(q, 1);
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
			/*
			 * Regardless whether a queue turns out to be busy, or
			 * is not operational, we need to continue resetting
			 * the remaining queues.
			 */
			if (ret)
				rc = ret;
		}
	}

	return rc;
}

1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
static int vfio_ap_mdev_open(struct mdev_device *mdev)
{
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
	unsigned long events;
	int ret;


	if (!try_module_get(THIS_MODULE))
		return -ENODEV;

	matrix_mdev->group_notifier.notifier_call = vfio_ap_mdev_group_notifier;
	events = VFIO_GROUP_NOTIFY_SET_KVM;

	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
				     &events, &matrix_mdev->group_notifier);
	if (ret) {
		module_put(THIS_MODULE);
		return ret;
	}

1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253
	matrix_mdev->iommu_notifier.notifier_call = vfio_ap_mdev_iommu_notifier;
	events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
	ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
				     &events, &matrix_mdev->iommu_notifier);
	if (!ret)
		return ret;

	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
				 &matrix_mdev->group_notifier);
	module_put(THIS_MODULE);
	return ret;
1254 1255 1256 1257 1258 1259
}

static void vfio_ap_mdev_release(struct mdev_device *mdev)
{
	struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);

1260
	mutex_lock(&matrix_dev->lock);
1261 1262
	if (matrix_mdev->kvm)
		vfio_ap_mdev_unset_kvm(matrix_mdev);
1263
	mutex_unlock(&matrix_dev->lock);
1264

1265 1266
	vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
				 &matrix_mdev->iommu_notifier);
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	vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
				 &matrix_mdev->group_notifier);
	module_put(THIS_MODULE);
}

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static int vfio_ap_mdev_get_device_info(unsigned long arg)
{
	unsigned long minsz;
	struct vfio_device_info info;

	minsz = offsetofend(struct vfio_device_info, num_irqs);

	if (copy_from_user(&info, (void __user *)arg, minsz))
		return -EFAULT;

	if (info.argsz < minsz)
		return -EINVAL;

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	info.flags = VFIO_DEVICE_FLAGS_AP | VFIO_DEVICE_FLAGS_RESET;
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	info.num_regions = 0;
	info.num_irqs = 0;

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	return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
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}

static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
				    unsigned int cmd, unsigned long arg)
{
	int ret;

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	mutex_lock(&matrix_dev->lock);
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	switch (cmd) {
	case VFIO_DEVICE_GET_INFO:
		ret = vfio_ap_mdev_get_device_info(arg);
		break;
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	case VFIO_DEVICE_RESET:
		ret = vfio_ap_mdev_reset_queues(mdev);
		break;
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	default:
		ret = -EOPNOTSUPP;
		break;
	}
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	mutex_unlock(&matrix_dev->lock);
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	return ret;
}

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static const struct mdev_parent_ops vfio_ap_matrix_ops = {
	.owner			= THIS_MODULE,
	.supported_type_groups	= vfio_ap_mdev_type_groups,
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	.mdev_attr_groups	= vfio_ap_mdev_attr_groups,
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	.create			= vfio_ap_mdev_create,
	.remove			= vfio_ap_mdev_remove,
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	.open			= vfio_ap_mdev_open,
	.release		= vfio_ap_mdev_release,
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	.ioctl			= vfio_ap_mdev_ioctl,
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};

int vfio_ap_mdev_register(void)
{
	atomic_set(&matrix_dev->available_instances, MAX_ZDEV_ENTRIES_EXT);

	return mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
}

void vfio_ap_mdev_unregister(void)
{
	mdev_unregister_device(&matrix_dev->device);
}