1305 lines
34 KiB
C
1305 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Adjunct processor matrix VFIO device driver callbacks.
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*
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* Copyright IBM Corp. 2018
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*
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* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
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* Halil Pasic <pasic@linux.ibm.com>
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* Pierre Morel <pmorel@linux.ibm.com>
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*/
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#include <linux/string.h>
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#include <linux/vfio.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <linux/bitops.h>
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <asm/kvm.h>
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#include <asm/zcrypt.h>
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#include "vfio_ap_private.h"
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#define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
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#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 int match_apqn(struct device *dev, const void *data)
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{
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struct vfio_ap_queue *q = dev_get_drvdata(dev);
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return (q->apqn == *(int *)(data)) ? 1 : 0;
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}
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/**
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* vfio_ap_get_queue: Retrieve a queue with a specific APQN from a list
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* @matrix_mdev: the associated mediated matrix
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* @apqn: The queue APQN
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*
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* Retrieve a queue with a specific APQN from the list of the
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* devices of the vfio_ap_drv.
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* Verify that the APID and the APQI are set in the matrix.
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*
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* Returns the pointer to the associated vfio_ap_queue
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*/
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static struct vfio_ap_queue *vfio_ap_get_queue(
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struct ap_matrix_mdev *matrix_mdev,
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int apqn)
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{
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struct vfio_ap_queue *q;
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struct device *dev;
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if (!test_bit_inv(AP_QID_CARD(apqn), matrix_mdev->matrix.apm))
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return NULL;
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if (!test_bit_inv(AP_QID_QUEUE(apqn), matrix_mdev->matrix.aqm))
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return NULL;
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dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
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&apqn, match_apqn);
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if (!dev)
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return NULL;
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q = dev_get_drvdata(dev);
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q->matrix_mdev = matrix_mdev;
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put_device(dev);
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return q;
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}
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/**
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* vfio_ap_wait_for_irqclear
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* @apqn: The AP Queue number
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*
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* Checks the IRQ bit for the status of this APQN using ap_tapq.
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* Returns if the ap_tapq function succeeded and the bit is clear.
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* Returns if ap_tapq function failed with invalid, deconfigured or
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* checkstopped AP.
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* Otherwise retries up to 5 times after waiting 20ms.
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*
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*/
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static void vfio_ap_wait_for_irqclear(int apqn)
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{
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struct ap_queue_status status;
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int retry = 5;
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do {
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status = ap_tapq(apqn, NULL);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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case AP_RESPONSE_RESET_IN_PROGRESS:
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if (!status.irq_enabled)
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return;
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fallthrough;
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case AP_RESPONSE_BUSY:
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msleep(20);
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break;
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case AP_RESPONSE_Q_NOT_AVAIL:
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case AP_RESPONSE_DECONFIGURED:
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case AP_RESPONSE_CHECKSTOPPED:
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default:
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WARN_ONCE(1, "%s: tapq rc %02x: %04x\n", __func__,
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status.response_code, apqn);
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return;
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}
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} while (--retry);
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WARN_ONCE(1, "%s: tapq rc %02x: %04x could not clear IR bit\n",
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__func__, status.response_code, apqn);
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}
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/**
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* vfio_ap_free_aqic_resources
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* @q: The vfio_ap_queue
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*
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* Unregisters the ISC in the GIB when the saved ISC not invalid.
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* Unpin the guest's page holding the NIB when it exist.
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* Reset the saved_pfn and saved_isc to invalid values.
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*
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*/
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static void vfio_ap_free_aqic_resources(struct vfio_ap_queue *q)
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{
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if (q->saved_isc != VFIO_AP_ISC_INVALID && q->matrix_mdev)
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kvm_s390_gisc_unregister(q->matrix_mdev->kvm, q->saved_isc);
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if (q->saved_pfn && q->matrix_mdev)
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vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev),
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&q->saved_pfn, 1);
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q->saved_pfn = 0;
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q->saved_isc = VFIO_AP_ISC_INVALID;
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}
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/**
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* vfio_ap_irq_disable
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* @q: The vfio_ap_queue
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*
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* Uses ap_aqic to disable the interruption and in case of success, reset
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* in progress or IRQ disable command already proceeded: calls
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* vfio_ap_wait_for_irqclear() to check for the IRQ bit to be clear
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* and calls vfio_ap_free_aqic_resources() to free the resources associated
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* with the AP interrupt handling.
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*
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* In the case the AP is busy, or a reset is in progress,
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* retries after 20ms, up to 5 times.
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*
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* Returns if ap_aqic function failed with invalid, deconfigured or
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* checkstopped AP.
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*/
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struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q)
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{
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struct ap_qirq_ctrl aqic_gisa = {};
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struct ap_queue_status status;
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int retries = 5;
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do {
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status = ap_aqic(q->apqn, aqic_gisa, NULL);
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switch (status.response_code) {
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case AP_RESPONSE_OTHERWISE_CHANGED:
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case AP_RESPONSE_NORMAL:
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vfio_ap_wait_for_irqclear(q->apqn);
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goto end_free;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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case AP_RESPONSE_BUSY:
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msleep(20);
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break;
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case AP_RESPONSE_Q_NOT_AVAIL:
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case AP_RESPONSE_DECONFIGURED:
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case AP_RESPONSE_CHECKSTOPPED:
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case AP_RESPONSE_INVALID_ADDRESS:
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default:
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/* All cases in default means AP not operational */
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WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__,
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status.response_code);
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goto end_free;
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}
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} while (retries--);
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WARN_ONCE(1, "%s: ap_aqic status %d\n", __func__,
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status.response_code);
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end_free:
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vfio_ap_free_aqic_resources(q);
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q->matrix_mdev = NULL;
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return status;
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}
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/**
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* vfio_ap_setirq: Enable Interruption for a APQN
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*
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* @dev: the device associated with the ap_queue
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* @q: the vfio_ap_queue holding AQIC parameters
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*
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* Pin the NIB saved in *q
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* Register the guest ISC to GIB interface and retrieve the
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* host ISC to issue the host side PQAP/AQIC
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*
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* Response.status may be set to AP_RESPONSE_INVALID_ADDRESS in case the
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* vfio_pin_pages failed.
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*
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* Otherwise return the ap_queue_status returned by the ap_aqic(),
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* all retry handling will be done by the guest.
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*/
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static struct ap_queue_status vfio_ap_irq_enable(struct vfio_ap_queue *q,
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int isc,
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unsigned long nib)
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{
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struct ap_qirq_ctrl aqic_gisa = {};
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struct ap_queue_status status = {};
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struct kvm_s390_gisa *gisa;
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struct kvm *kvm;
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unsigned long h_nib, g_pfn, h_pfn;
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int ret;
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g_pfn = nib >> PAGE_SHIFT;
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ret = vfio_pin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1,
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IOMMU_READ | IOMMU_WRITE, &h_pfn);
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switch (ret) {
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case 1:
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break;
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default:
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status.response_code = AP_RESPONSE_INVALID_ADDRESS;
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return status;
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}
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kvm = q->matrix_mdev->kvm;
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gisa = kvm->arch.gisa_int.origin;
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h_nib = (h_pfn << PAGE_SHIFT) | (nib & ~PAGE_MASK);
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aqic_gisa.gisc = isc;
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aqic_gisa.isc = kvm_s390_gisc_register(kvm, isc);
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aqic_gisa.ir = 1;
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aqic_gisa.gisa = (uint64_t)gisa >> 4;
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status = ap_aqic(q->apqn, aqic_gisa, (void *)h_nib);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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/* See if we did clear older IRQ configuration */
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vfio_ap_free_aqic_resources(q);
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q->saved_pfn = g_pfn;
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q->saved_isc = isc;
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break;
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case AP_RESPONSE_OTHERWISE_CHANGED:
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/* We could not modify IRQ setings: clear new configuration */
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vfio_unpin_pages(mdev_dev(q->matrix_mdev->mdev), &g_pfn, 1);
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kvm_s390_gisc_unregister(kvm, isc);
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break;
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default:
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pr_warn("%s: apqn %04x: response: %02x\n", __func__, q->apqn,
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status.response_code);
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vfio_ap_irq_disable(q);
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break;
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}
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return status;
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}
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/**
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* handle_pqap: PQAP instruction callback
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*
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* @vcpu: The vcpu on which we received the PQAP instruction
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*
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* Get the general register contents to initialize internal variables.
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* REG[0]: APQN
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* REG[1]: IR and ISC
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* REG[2]: NIB
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*
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* Response.status may be set to following Response Code:
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* - AP_RESPONSE_Q_NOT_AVAIL: if the queue is not available
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* - AP_RESPONSE_DECONFIGURED: if the queue is not configured
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* - AP_RESPONSE_NORMAL (0) : in case of successs
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* Check vfio_ap_setirq() and vfio_ap_clrirq() for other possible RC.
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* We take the matrix_dev lock to ensure serialization on queues and
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* mediated device access.
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*
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* Return 0 if we could handle the request inside KVM.
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* otherwise, returns -EOPNOTSUPP to let QEMU handle the fault.
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*/
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static int handle_pqap(struct kvm_vcpu *vcpu)
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{
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uint64_t status;
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uint16_t apqn;
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struct vfio_ap_queue *q;
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struct ap_queue_status qstatus = {
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.response_code = AP_RESPONSE_Q_NOT_AVAIL, };
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struct ap_matrix_mdev *matrix_mdev;
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/* If we do not use the AIV facility just go to userland */
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if (!(vcpu->arch.sie_block->eca & ECA_AIV))
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return -EOPNOTSUPP;
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apqn = vcpu->run->s.regs.gprs[0] & 0xffff;
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mutex_lock(&matrix_dev->lock);
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if (!vcpu->kvm->arch.crypto.pqap_hook)
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goto out_unlock;
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matrix_mdev = container_of(vcpu->kvm->arch.crypto.pqap_hook,
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struct ap_matrix_mdev, pqap_hook);
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q = vfio_ap_get_queue(matrix_mdev, apqn);
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if (!q)
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goto out_unlock;
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status = vcpu->run->s.regs.gprs[1];
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/* If IR bit(16) is set we enable the interrupt */
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if ((status >> (63 - 16)) & 0x01)
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qstatus = vfio_ap_irq_enable(q, status & 0x07,
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vcpu->run->s.regs.gprs[2]);
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else
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qstatus = vfio_ap_irq_disable(q);
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out_unlock:
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memcpy(&vcpu->run->s.regs.gprs[1], &qstatus, sizeof(qstatus));
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vcpu->run->s.regs.gprs[1] >>= 32;
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mutex_unlock(&matrix_dev->lock);
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return 0;
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}
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static void vfio_ap_matrix_init(struct ap_config_info *info,
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struct ap_matrix *matrix)
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{
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matrix->apm_max = info->apxa ? info->Na : 63;
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matrix->aqm_max = info->apxa ? info->Nd : 15;
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matrix->adm_max = info->apxa ? info->Nd : 15;
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}
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static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
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{
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struct ap_matrix_mdev *matrix_mdev;
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if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))
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return -EPERM;
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matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);
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if (!matrix_mdev) {
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atomic_inc(&matrix_dev->available_instances);
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return -ENOMEM;
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}
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matrix_mdev->mdev = mdev;
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vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
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mdev_set_drvdata(mdev, matrix_mdev);
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matrix_mdev->pqap_hook.hook = handle_pqap;
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matrix_mdev->pqap_hook.owner = THIS_MODULE;
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mutex_lock(&matrix_dev->lock);
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list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
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mutex_unlock(&matrix_dev->lock);
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return 0;
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}
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static int vfio_ap_mdev_remove(struct mdev_device *mdev)
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{
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struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
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if (matrix_mdev->kvm)
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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);
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mutex_unlock(&matrix_dev->lock);
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kfree(matrix_mdev);
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mdev_set_drvdata(mdev, NULL);
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atomic_inc(&matrix_dev->available_instances);
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return 0;
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}
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static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
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{
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return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
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}
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static MDEV_TYPE_ATTR_RO(name);
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static ssize_t available_instances_show(struct kobject *kobj,
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struct device *dev, char *buf)
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{
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return sprintf(buf, "%d\n",
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atomic_read(&matrix_dev->available_instances));
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}
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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,
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char *buf)
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{
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return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
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}
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static MDEV_TYPE_ATTR_RO(device_api);
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static struct attribute *vfio_ap_mdev_type_attrs[] = {
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&mdev_type_attr_name.attr,
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&mdev_type_attr_device_api.attr,
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&mdev_type_attr_available_instances.attr,
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NULL,
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};
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static struct attribute_group vfio_ap_mdev_hwvirt_type_group = {
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.name = VFIO_AP_MDEV_TYPE_HWVIRT,
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.attrs = vfio_ap_mdev_type_attrs,
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};
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static struct attribute_group *vfio_ap_mdev_type_groups[] = {
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&vfio_ap_mdev_hwvirt_type_group,
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NULL,
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};
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struct vfio_ap_queue_reserved {
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unsigned long *apid;
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unsigned long *apqi;
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bool reserved;
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};
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/**
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* vfio_ap_has_queue
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*
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* @dev: an AP queue device
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* @data: a struct vfio_ap_queue_reserved reference
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*
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* Flags whether the AP queue device (@dev) has a queue ID containing the APQN,
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* apid or apqi specified in @data:
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*
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* - If @data contains both an apid and apqi value, then @data will be flagged
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* as reserved if the APID and APQI fields for the AP queue device matches
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*
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* - If @data contains only an apid value, @data will be flagged as
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* reserved if the APID field in the AP queue device matches
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*
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* - If @data contains only an apqi value, @data will be flagged as
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* reserved if the APQI field in the AP queue device matches
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*
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* Returns 0 to indicate the input to function succeeded. Returns -EINVAL if
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* @data does not contain either an apid or apqi.
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*/
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static int vfio_ap_has_queue(struct device *dev, void *data)
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{
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struct vfio_ap_queue_reserved *qres = data;
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struct ap_queue *ap_queue = to_ap_queue(dev);
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ap_qid_t qid;
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unsigned long id;
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if (qres->apid && qres->apqi) {
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qid = AP_MKQID(*qres->apid, *qres->apqi);
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if (qid == ap_queue->qid)
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qres->reserved = true;
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} else if (qres->apid && !qres->apqi) {
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id = AP_QID_CARD(ap_queue->qid);
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if (id == *qres->apid)
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qres->reserved = true;
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} else if (!qres->apid && qres->apqi) {
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id = AP_QID_QUEUE(ap_queue->qid);
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if (id == *qres->apqi)
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qres->reserved = true;
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} else {
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return -EINVAL;
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}
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return 0;
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}
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/**
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* vfio_ap_verify_queue_reserved
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*
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* @matrix_dev: a mediated matrix device
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* @apid: an AP adapter ID
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* @apqi: an AP queue index
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*
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* Verifies that the AP queue with @apid/@apqi is reserved by the VFIO AP device
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* driver according to the following rules:
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*
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* - If both @apid and @apqi are not NULL, then there must be an AP queue
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* device bound to the vfio_ap driver with the APQN identified by @apid and
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* @apqi
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*
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* - 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;
|
|
|
|
ret = driver_for_each_device(&matrix_dev->vfio_ap_drv->driver, NULL,
|
|
&qres, vfio_ap_has_queue);
|
|
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);
|
|
|
|
/* If the guest is running, disallow assignment of adapter */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
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);
|
|
|
|
/* If the guest is running, disallow un-assignment of adapter */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
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;
|
|
}
|
|
static DEVICE_ATTR_WO(unassign_adapter);
|
|
|
|
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;
|
|
|
|
/* If the guest is running, disallow assignment of domain */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
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;
|
|
}
|
|
static DEVICE_ATTR_WO(assign_domain);
|
|
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/* If the guest is running, disallow un-assignment of domain */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
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;
|
|
}
|
|
static DEVICE_ATTR_WO(unassign_domain);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
/* If the guest is running, disallow assignment of control domain */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
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;
|
|
}
|
|
static DEVICE_ATTR_WO(assign_control_domain);
|
|
|
|
/**
|
|
* 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;
|
|
|
|
/* If the guest is running, disallow un-assignment of control domain */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
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;
|
|
}
|
|
static DEVICE_ATTR_WO(unassign_control_domain);
|
|
|
|
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;
|
|
}
|
|
static DEVICE_ATTR_RO(control_domains);
|
|
|
|
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;
|
|
}
|
|
static DEVICE_ATTR_RO(matrix);
|
|
|
|
static struct attribute *vfio_ap_mdev_attrs[] = {
|
|
&dev_attr_assign_adapter.attr,
|
|
&dev_attr_unassign_adapter.attr,
|
|
&dev_attr_assign_domain.attr,
|
|
&dev_attr_unassign_domain.attr,
|
|
&dev_attr_assign_control_domain.attr,
|
|
&dev_attr_unassign_control_domain.attr,
|
|
&dev_attr_control_domains.attr,
|
|
&dev_attr_matrix.attr,
|
|
NULL,
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
/**
|
|
* 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;
|
|
|
|
mutex_lock(&matrix_dev->lock);
|
|
|
|
list_for_each_entry(m, &matrix_dev->mdev_list, node) {
|
|
if ((m != matrix_mdev) && (m->kvm == kvm)) {
|
|
mutex_unlock(&matrix_dev->lock);
|
|
return -EPERM;
|
|
}
|
|
}
|
|
|
|
matrix_mdev->kvm = kvm;
|
|
kvm_get_kvm(kvm);
|
|
kvm->arch.crypto.pqap_hook = &matrix_mdev->pqap_hook;
|
|
mutex_unlock(&matrix_dev->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
int ret;
|
|
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);
|
|
|
|
if (!data) {
|
|
matrix_mdev->kvm = NULL;
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
ret = vfio_ap_mdev_set_kvm(matrix_mdev, data);
|
|
if (ret)
|
|
return NOTIFY_DONE;
|
|
|
|
/* If there is no CRYCB pointer, then we can't copy the masks */
|
|
if (!matrix_mdev->kvm->arch.crypto.crycbd)
|
|
return NOTIFY_DONE;
|
|
|
|
kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
|
|
matrix_mdev->matrix.aqm,
|
|
matrix_mdev->matrix.adm);
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static void vfio_ap_irq_disable_apqn(int apqn)
|
|
{
|
|
struct device *dev;
|
|
struct vfio_ap_queue *q;
|
|
|
|
dev = driver_find_device(&matrix_dev->vfio_ap_drv->driver, NULL,
|
|
&apqn, match_apqn);
|
|
if (dev) {
|
|
q = dev_get_drvdata(dev);
|
|
vfio_ap_irq_disable(q);
|
|
put_device(dev);
|
|
}
|
|
}
|
|
|
|
int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
|
|
unsigned int retry)
|
|
{
|
|
struct ap_queue_status status;
|
|
int retry2 = 2;
|
|
int apqn = AP_MKQID(apid, apqi);
|
|
|
|
do {
|
|
status = ap_zapq(apqn);
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
while (!status.queue_empty && retry2--) {
|
|
msleep(20);
|
|
status = ap_tapq(apqn, NULL);
|
|
}
|
|
WARN_ON_ONCE(retry2 <= 0);
|
|
return 0;
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
case AP_RESPONSE_BUSY:
|
|
msleep(20);
|
|
break;
|
|
default:
|
|
/* things are really broken, give up */
|
|
return -EIO;
|
|
}
|
|
} while (retry--);
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
|
|
{
|
|
int ret;
|
|
int rc = 0;
|
|
unsigned long apid, apqi;
|
|
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) {
|
|
ret = vfio_ap_mdev_reset_queue(apid, apqi, 1);
|
|
/*
|
|
* 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;
|
|
vfio_ap_irq_disable_apqn(AP_MKQID(apid, apqi));
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static void vfio_ap_mdev_release(struct mdev_device *mdev)
|
|
{
|
|
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
|
|
|
|
mutex_lock(&matrix_dev->lock);
|
|
if (matrix_mdev->kvm) {
|
|
kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
|
|
matrix_mdev->kvm->arch.crypto.pqap_hook = NULL;
|
|
vfio_ap_mdev_reset_queues(mdev);
|
|
kvm_put_kvm(matrix_mdev->kvm);
|
|
matrix_mdev->kvm = NULL;
|
|
}
|
|
mutex_unlock(&matrix_dev->lock);
|
|
|
|
vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
|
|
&matrix_mdev->iommu_notifier);
|
|
vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
|
|
&matrix_mdev->group_notifier);
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
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;
|
|
|
|
info.flags = VFIO_DEVICE_FLAGS_AP | VFIO_DEVICE_FLAGS_RESET;
|
|
info.num_regions = 0;
|
|
info.num_irqs = 0;
|
|
|
|
return copy_to_user((void __user *)arg, &info, minsz);
|
|
}
|
|
|
|
static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&matrix_dev->lock);
|
|
switch (cmd) {
|
|
case VFIO_DEVICE_GET_INFO:
|
|
ret = vfio_ap_mdev_get_device_info(arg);
|
|
break;
|
|
case VFIO_DEVICE_RESET:
|
|
ret = vfio_ap_mdev_reset_queues(mdev);
|
|
break;
|
|
default:
|
|
ret = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
mutex_unlock(&matrix_dev->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct mdev_parent_ops vfio_ap_matrix_ops = {
|
|
.owner = THIS_MODULE,
|
|
.supported_type_groups = vfio_ap_mdev_type_groups,
|
|
.mdev_attr_groups = vfio_ap_mdev_attr_groups,
|
|
.create = vfio_ap_mdev_create,
|
|
.remove = vfio_ap_mdev_remove,
|
|
.open = vfio_ap_mdev_open,
|
|
.release = vfio_ap_mdev_release,
|
|
.ioctl = vfio_ap_mdev_ioctl,
|
|
};
|
|
|
|
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);
|
|
}
|