diff options
Diffstat (limited to 'drivers/virt/vboxguest/vboxguest_linux.c')
| -rw-r--r-- | drivers/virt/vboxguest/vboxguest_linux.c | 500 |
1 files changed, 500 insertions, 0 deletions
diff --git a/drivers/virt/vboxguest/vboxguest_linux.c b/drivers/virt/vboxguest/vboxguest_linux.c new file mode 100644 index 000000000..c47e62dc5 --- /dev/null +++ b/drivers/virt/vboxguest/vboxguest_linux.c @@ -0,0 +1,500 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * vboxguest linux pci driver, char-dev and input-device code, + * + * Copyright (C) 2006-2016 Oracle Corporation + */ + +#include <linux/cred.h> +#include <linux/input.h> +#include <linux/kernel.h> +#include <linux/miscdevice.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/poll.h> +#include <linux/vbox_utils.h> +#include "vboxguest_core.h" + +/** The device name. */ +#define DEVICE_NAME "vboxguest" +/** The device name for the device node open to everyone. */ +#define DEVICE_NAME_USER "vboxuser" +/** VirtualBox PCI vendor ID. */ +#define VBOX_VENDORID 0x80ee +/** VMMDev PCI card product ID. */ +#define VMMDEV_DEVICEID 0xcafe + +/** Mutex protecting the global vbg_gdev pointer used by vbg_get/put_gdev. */ +static DEFINE_MUTEX(vbg_gdev_mutex); +/** Global vbg_gdev pointer used by vbg_get/put_gdev. */ +static struct vbg_dev *vbg_gdev; + +static u32 vbg_misc_device_requestor(struct inode *inode) +{ + u32 requestor = VMMDEV_REQUESTOR_USERMODE | + VMMDEV_REQUESTOR_CON_DONT_KNOW | + VMMDEV_REQUESTOR_TRUST_NOT_GIVEN; + + if (from_kuid(current_user_ns(), current_uid()) == 0) + requestor |= VMMDEV_REQUESTOR_USR_ROOT; + else + requestor |= VMMDEV_REQUESTOR_USR_USER; + + if (in_egroup_p(inode->i_gid)) + requestor |= VMMDEV_REQUESTOR_GRP_VBOX; + + return requestor; +} + +static int vbg_misc_device_open(struct inode *inode, struct file *filp) +{ + struct vbg_session *session; + struct vbg_dev *gdev; + + /* misc_open sets filp->private_data to our misc device */ + gdev = container_of(filp->private_data, struct vbg_dev, misc_device); + + session = vbg_core_open_session(gdev, vbg_misc_device_requestor(inode)); + if (IS_ERR(session)) + return PTR_ERR(session); + + filp->private_data = session; + return 0; +} + +static int vbg_misc_device_user_open(struct inode *inode, struct file *filp) +{ + struct vbg_session *session; + struct vbg_dev *gdev; + + /* misc_open sets filp->private_data to our misc device */ + gdev = container_of(filp->private_data, struct vbg_dev, + misc_device_user); + + session = vbg_core_open_session(gdev, vbg_misc_device_requestor(inode) | + VMMDEV_REQUESTOR_USER_DEVICE); + if (IS_ERR(session)) + return PTR_ERR(session); + + filp->private_data = session; + return 0; +} + +/** + * Close device. + * Return: 0 on success, negated errno on failure. + * @inode: Pointer to inode info structure. + * @filp: Associated file pointer. + */ +static int vbg_misc_device_close(struct inode *inode, struct file *filp) +{ + vbg_core_close_session(filp->private_data); + filp->private_data = NULL; + return 0; +} + +/** + * Device I/O Control entry point. + * Return: 0 on success, negated errno on failure. + * @filp: Associated file pointer. + * @req: The request specified to ioctl(). + * @arg: The argument specified to ioctl(). + */ +static long vbg_misc_device_ioctl(struct file *filp, unsigned int req, + unsigned long arg) +{ + struct vbg_session *session = filp->private_data; + size_t returned_size, size; + struct vbg_ioctl_hdr hdr; + bool is_vmmdev_req; + int ret = 0; + void *buf; + + if (copy_from_user(&hdr, (void *)arg, sizeof(hdr))) + return -EFAULT; + + if (hdr.version != VBG_IOCTL_HDR_VERSION) + return -EINVAL; + + if (hdr.size_in < sizeof(hdr) || + (hdr.size_out && hdr.size_out < sizeof(hdr))) + return -EINVAL; + + size = max(hdr.size_in, hdr.size_out); + if (_IOC_SIZE(req) && _IOC_SIZE(req) != size) + return -EINVAL; + if (size > SZ_16M) + return -E2BIG; + + /* + * IOCTL_VMMDEV_REQUEST needs the buffer to be below 4G to avoid + * the need for a bounce-buffer and another copy later on. + */ + is_vmmdev_req = (req & ~IOCSIZE_MASK) == VBG_IOCTL_VMMDEV_REQUEST(0) || + req == VBG_IOCTL_VMMDEV_REQUEST_BIG || + req == VBG_IOCTL_VMMDEV_REQUEST_BIG_ALT; + + if (is_vmmdev_req) + buf = vbg_req_alloc(size, VBG_IOCTL_HDR_TYPE_DEFAULT, + session->requestor); + else + buf = kmalloc(size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + *((struct vbg_ioctl_hdr *)buf) = hdr; + if (copy_from_user(buf + sizeof(hdr), (void *)arg + sizeof(hdr), + hdr.size_in - sizeof(hdr))) { + ret = -EFAULT; + goto out; + } + if (hdr.size_in < size) + memset(buf + hdr.size_in, 0, size - hdr.size_in); + + ret = vbg_core_ioctl(session, req, buf); + if (ret) + goto out; + + returned_size = ((struct vbg_ioctl_hdr *)buf)->size_out; + if (returned_size > size) { + vbg_debug("%s: too much output data %zu > %zu\n", + __func__, returned_size, size); + returned_size = size; + } + if (copy_to_user((void *)arg, buf, returned_size) != 0) + ret = -EFAULT; + +out: + if (is_vmmdev_req) + vbg_req_free(buf, size); + else + kfree(buf); + + return ret; +} + +/** The file_operations structures. */ +static const struct file_operations vbg_misc_device_fops = { + .owner = THIS_MODULE, + .open = vbg_misc_device_open, + .release = vbg_misc_device_close, + .unlocked_ioctl = vbg_misc_device_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = vbg_misc_device_ioctl, +#endif +}; +static const struct file_operations vbg_misc_device_user_fops = { + .owner = THIS_MODULE, + .open = vbg_misc_device_user_open, + .release = vbg_misc_device_close, + .unlocked_ioctl = vbg_misc_device_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = vbg_misc_device_ioctl, +#endif +}; + +/** + * Called when the input device is first opened. + * + * Sets up absolute mouse reporting. + */ +static int vbg_input_open(struct input_dev *input) +{ + struct vbg_dev *gdev = input_get_drvdata(input); + u32 feat = VMMDEV_MOUSE_GUEST_CAN_ABSOLUTE | VMMDEV_MOUSE_NEW_PROTOCOL; + + return vbg_core_set_mouse_status(gdev, feat); +} + +/** + * Called if all open handles to the input device are closed. + * + * Disables absolute reporting. + */ +static void vbg_input_close(struct input_dev *input) +{ + struct vbg_dev *gdev = input_get_drvdata(input); + + vbg_core_set_mouse_status(gdev, 0); +} + +/** + * Creates the kernel input device. + * + * Return: 0 on success, negated errno on failure. + */ +static int vbg_create_input_device(struct vbg_dev *gdev) +{ + struct input_dev *input; + + input = devm_input_allocate_device(gdev->dev); + if (!input) + return -ENOMEM; + + input->id.bustype = BUS_PCI; + input->id.vendor = VBOX_VENDORID; + input->id.product = VMMDEV_DEVICEID; + input->open = vbg_input_open; + input->close = vbg_input_close; + input->dev.parent = gdev->dev; + input->name = "VirtualBox mouse integration"; + + input_set_abs_params(input, ABS_X, VMMDEV_MOUSE_RANGE_MIN, + VMMDEV_MOUSE_RANGE_MAX, 0, 0); + input_set_abs_params(input, ABS_Y, VMMDEV_MOUSE_RANGE_MIN, + VMMDEV_MOUSE_RANGE_MAX, 0, 0); + input_set_capability(input, EV_KEY, BTN_MOUSE); + input_set_drvdata(input, gdev); + + gdev->input = input; + + return input_register_device(gdev->input); +} + +static ssize_t host_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct vbg_dev *gdev = dev_get_drvdata(dev); + + return sprintf(buf, "%s\n", gdev->host_version); +} + +static ssize_t host_features_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct vbg_dev *gdev = dev_get_drvdata(dev); + + return sprintf(buf, "%#x\n", gdev->host_features); +} + +static DEVICE_ATTR_RO(host_version); +static DEVICE_ATTR_RO(host_features); + +static struct attribute *vbg_pci_attrs[] = { + &dev_attr_host_version.attr, + &dev_attr_host_features.attr, + NULL, +}; +ATTRIBUTE_GROUPS(vbg_pci); + +/** + * Does the PCI detection and init of the device. + * + * Return: 0 on success, negated errno on failure. + */ +static int vbg_pci_probe(struct pci_dev *pci, const struct pci_device_id *id) +{ + struct device *dev = &pci->dev; + resource_size_t io, io_len, mmio, mmio_len; + struct vmmdev_memory *vmmdev; + struct vbg_dev *gdev; + int ret; + + gdev = devm_kzalloc(dev, sizeof(*gdev), GFP_KERNEL); + if (!gdev) + return -ENOMEM; + + ret = pci_enable_device(pci); + if (ret != 0) { + vbg_err("vboxguest: Error enabling device: %d\n", ret); + return ret; + } + + ret = -ENODEV; + + io = pci_resource_start(pci, 0); + io_len = pci_resource_len(pci, 0); + if (!io || !io_len) { + vbg_err("vboxguest: Error IO-port resource (0) is missing\n"); + goto err_disable_pcidev; + } + if (devm_request_region(dev, io, io_len, DEVICE_NAME) == NULL) { + vbg_err("vboxguest: Error could not claim IO resource\n"); + ret = -EBUSY; + goto err_disable_pcidev; + } + + mmio = pci_resource_start(pci, 1); + mmio_len = pci_resource_len(pci, 1); + if (!mmio || !mmio_len) { + vbg_err("vboxguest: Error MMIO resource (1) is missing\n"); + goto err_disable_pcidev; + } + + if (devm_request_mem_region(dev, mmio, mmio_len, DEVICE_NAME) == NULL) { + vbg_err("vboxguest: Error could not claim MMIO resource\n"); + ret = -EBUSY; + goto err_disable_pcidev; + } + + vmmdev = devm_ioremap(dev, mmio, mmio_len); + if (!vmmdev) { + vbg_err("vboxguest: Error ioremap failed; MMIO addr=%pap size=%pap\n", + &mmio, &mmio_len); + goto err_disable_pcidev; + } + + /* Validate MMIO region version and size. */ + if (vmmdev->version != VMMDEV_MEMORY_VERSION || + vmmdev->size < 32 || vmmdev->size > mmio_len) { + vbg_err("vboxguest: Bogus VMMDev memory; version=%08x (expected %08x) size=%d (expected <= %d)\n", + vmmdev->version, VMMDEV_MEMORY_VERSION, + vmmdev->size, (int)mmio_len); + goto err_disable_pcidev; + } + + gdev->io_port = io; + gdev->mmio = vmmdev; + gdev->dev = dev; + gdev->misc_device.minor = MISC_DYNAMIC_MINOR; + gdev->misc_device.name = DEVICE_NAME; + gdev->misc_device.fops = &vbg_misc_device_fops; + gdev->misc_device_user.minor = MISC_DYNAMIC_MINOR; + gdev->misc_device_user.name = DEVICE_NAME_USER; + gdev->misc_device_user.fops = &vbg_misc_device_user_fops; + + ret = vbg_core_init(gdev, VMMDEV_EVENT_MOUSE_POSITION_CHANGED); + if (ret) + goto err_disable_pcidev; + + ret = vbg_create_input_device(gdev); + if (ret) { + vbg_err("vboxguest: Error creating input device: %d\n", ret); + goto err_vbg_core_exit; + } + + ret = request_irq(pci->irq, vbg_core_isr, IRQF_SHARED, DEVICE_NAME, + gdev); + if (ret) { + vbg_err("vboxguest: Error requesting irq: %d\n", ret); + goto err_vbg_core_exit; + } + + ret = misc_register(&gdev->misc_device); + if (ret) { + vbg_err("vboxguest: Error misc_register %s failed: %d\n", + DEVICE_NAME, ret); + goto err_free_irq; + } + + ret = misc_register(&gdev->misc_device_user); + if (ret) { + vbg_err("vboxguest: Error misc_register %s failed: %d\n", + DEVICE_NAME_USER, ret); + goto err_unregister_misc_device; + } + + mutex_lock(&vbg_gdev_mutex); + if (!vbg_gdev) + vbg_gdev = gdev; + else + ret = -EBUSY; + mutex_unlock(&vbg_gdev_mutex); + + if (ret) { + vbg_err("vboxguest: Error more then 1 vbox guest pci device\n"); + goto err_unregister_misc_device_user; + } + + pci_set_drvdata(pci, gdev); + + return 0; + +err_unregister_misc_device_user: + misc_deregister(&gdev->misc_device_user); +err_unregister_misc_device: + misc_deregister(&gdev->misc_device); +err_free_irq: + free_irq(pci->irq, gdev); +err_vbg_core_exit: + vbg_core_exit(gdev); +err_disable_pcidev: + pci_disable_device(pci); + + return ret; +} + +static void vbg_pci_remove(struct pci_dev *pci) +{ + struct vbg_dev *gdev = pci_get_drvdata(pci); + + mutex_lock(&vbg_gdev_mutex); + vbg_gdev = NULL; + mutex_unlock(&vbg_gdev_mutex); + + free_irq(pci->irq, gdev); + misc_deregister(&gdev->misc_device_user); + misc_deregister(&gdev->misc_device); + vbg_core_exit(gdev); + pci_disable_device(pci); +} + +struct vbg_dev *vbg_get_gdev(void) +{ + mutex_lock(&vbg_gdev_mutex); + + /* + * Note on success we keep the mutex locked until vbg_put_gdev(), + * this stops vbg_pci_remove from removing the device from underneath + * vboxsf. vboxsf will only hold a reference for a short while. + */ + if (vbg_gdev) + return vbg_gdev; + + mutex_unlock(&vbg_gdev_mutex); + return ERR_PTR(-ENODEV); +} +EXPORT_SYMBOL(vbg_get_gdev); + +void vbg_put_gdev(struct vbg_dev *gdev) +{ + WARN_ON(gdev != vbg_gdev); + mutex_unlock(&vbg_gdev_mutex); +} +EXPORT_SYMBOL(vbg_put_gdev); + +/** + * Callback for mouse events. + * + * This is called at the end of the ISR, after leaving the event spinlock, if + * VMMDEV_EVENT_MOUSE_POSITION_CHANGED was raised by the host. + * + * @gdev: The device extension. + */ +void vbg_linux_mouse_event(struct vbg_dev *gdev) +{ + int rc; + + /* Report events to the kernel input device */ + gdev->mouse_status_req->mouse_features = 0; + gdev->mouse_status_req->pointer_pos_x = 0; + gdev->mouse_status_req->pointer_pos_y = 0; + rc = vbg_req_perform(gdev, gdev->mouse_status_req); + if (rc >= 0) { + input_report_abs(gdev->input, ABS_X, + gdev->mouse_status_req->pointer_pos_x); + input_report_abs(gdev->input, ABS_Y, + gdev->mouse_status_req->pointer_pos_y); + input_sync(gdev->input); + } +} + +static const struct pci_device_id vbg_pci_ids[] = { + { .vendor = VBOX_VENDORID, .device = VMMDEV_DEVICEID }, + {} +}; +MODULE_DEVICE_TABLE(pci, vbg_pci_ids); + +static struct pci_driver vbg_pci_driver = { + .name = DEVICE_NAME, + .dev_groups = vbg_pci_groups, + .id_table = vbg_pci_ids, + .probe = vbg_pci_probe, + .remove = vbg_pci_remove, +}; + +module_pci_driver(vbg_pci_driver); + +MODULE_AUTHOR("Oracle Corporation"); +MODULE_DESCRIPTION("Oracle VM VirtualBox Guest Additions for Linux Module"); +MODULE_LICENSE("GPL"); |