96 lines
1.9 KiB
C
96 lines
1.9 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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*/
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/* Routines to notify the VBS-K in kernel */
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include "virtio_kernel.h"
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static int virtio_kernel_debug;
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#define DPRINTF(params) do { if (virtio_kernel_debug) printf params; } while (0)
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#define WPRINTF(params) (printf params)
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static int
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vbs_dev_info_set(int fd, void *arg)
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{
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return ioctl(fd, VBS_K_SET_DEV, arg);
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}
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static int
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vbs_vqs_info_set(int fd, void *arg)
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{
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return ioctl(fd, VBS_K_SET_VQ, arg);
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}
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/* VBS-K common ops */
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/**
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* @brief Virtio kernel module reset.
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*
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* @param fd File descriptor representing virtio backend in kernel module.
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*
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* @return 0 on OK and non-zero on error.
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*/
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int
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vbs_kernel_reset(int fd)
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{
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return ioctl(fd, VBS_K_RESET_DEV, NULL);
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}
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/*
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* We need a way to start/stop vbs_k execution since guest might want to
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* change the configuration of the virtio device after VBS-K has been
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* initialized.
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*/
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/**
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* @brief Virtio kernel module start.
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*
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* @param fd File descriptor representing virtio backend in kernel module.
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* @param dev Pointer to struct vbs_dev_info.
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* @param vqs Pointer to struct vbs_vqs_info.
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*
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* @return 0 on OK and non-zero on error.
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*/
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int
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vbs_kernel_start(int fd, struct vbs_dev_info *dev, struct vbs_vqs_info *vqs)
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{
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int ret;
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if (fd < 0) {
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WPRINTF(("%s: fd < 0\n", __func__));
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return -VIRTIO_ERROR_FD_OPEN_FAILED;
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}
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ret = vbs_dev_info_set(fd, dev);
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if (ret < 0) {
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WPRINTF(("vbs_kernel_set_dev failed: ret %d\n", ret));
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return ret;
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}
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ret = vbs_vqs_info_set(fd, vqs);
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if (ret < 0) {
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WPRINTF(("vbs_kernel_set_vqs failed: ret %d\n", ret));
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return ret;
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}
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return VIRTIO_SUCCESS;
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}
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/**
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* @brief Virtio kernel module stop.
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*
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* @param fd File descriptor representing virtio backend in kernel module.
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*
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* @return 0 on OK and non-zero on error.
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*/
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int
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vbs_kernel_stop(int fd)
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{
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DPRINTF(("%s\n", __func__));
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return VIRTIO_SUCCESS;
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}
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