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virt: Add vboxguest driver for Virtual Box Guest integration

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This commit adds a driver for the Virtual Box Guest PCI device used in
Virtual Box virtual machines. Enabling this driver will add support for
Virtual Box Guest integration features such as copy-and-paste, seamless
mode and OpenGL pass-through.

This driver also offers vboxguest IPC functionality which is needed
for the vboxfs driver which offers folder sharing support.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans de Goede 2017-11-30 17:01:27 +01:00 committed by Greg Kroah-Hartman
parent 579db9d45c
commit 0ba002bc43
8 changed files with 2253 additions and 0 deletions
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1
drivers/virt/Kconfig
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@ -30,4 +30,5 @@ config FSL_HV_MANAGER
4) A kernel interface for receiving callbacks when a managed
partition shuts down.
source "drivers/virt/vboxguest/Kconfig"
endif

1
drivers/virt/Makefile
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@ -3,3 +3,4 @@
#
obj-$(CONFIG_FSL_HV_MANAGER) += fsl_hypervisor.o
obj-y += vboxguest/

18
drivers/virt/vboxguest/Kconfig Normal file
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@ -0,0 +1,18 @@
config VBOXGUEST
tristate "Virtual Box Guest integration support"
depends on X86 && PCI && INPUT
help
This is a driver for the Virtual Box Guest PCI device used in
Virtual Box virtual machines. Enabling this driver will add
support for Virtual Box Guest integration features such as
copy-and-paste, seamless mode and OpenGL pass-through.
This driver also offers vboxguest IPC functionality which is needed
for the vboxfs driver which offers folder sharing support.
If you enable this driver you should also enable the VBOXVIDEO option.
Although it is possible to build this module in, it is advised
to build this driver as a module, so that it can be updated
independently of the kernel. Select M to build this driver as a
module.

3
drivers/virt/vboxguest/Makefile Normal file
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@ -0,0 +1,3 @@
vboxguest-y := vboxguest_linux.o vboxguest_core.o vboxguest_utils.o
obj-$(CONFIG_VBOXGUEST) += vboxguest.o

1571
drivers/virt/vboxguest/vboxguest_core.c Normal file
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File diff suppressed because it is too large Load Diff

174
drivers/virt/vboxguest/vboxguest_core.h Normal file
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@ -0,0 +1,174 @@
/* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */
/* Copyright (C) 2010-2016 Oracle Corporation */
#ifndef __VBOXGUEST_CORE_H__
#define __VBOXGUEST_CORE_H__
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/vboxguest.h>
#include "vmmdev.h"
struct vbg_session;
/** VBox guest memory balloon. */
struct vbg_mem_balloon {
/** Work handling VMMDEV_EVENT_BALLOON_CHANGE_REQUEST events */
struct work_struct work;
/** Pre-allocated vmmdev_memballoon_info req for query */
struct vmmdev_memballoon_info *get_req;
/** Pre-allocated vmmdev_memballoon_change req for inflate / deflate */
struct vmmdev_memballoon_change *change_req;
/** The current number of chunks in the balloon. */
u32 chunks;
/** The maximum number of chunks in the balloon. */
u32 max_chunks;
/**
* Array of pointers to page arrays. A page * array is allocated for
* each chunk when inflating, and freed when the deflating.
*/
struct page ***pages;
};
/**
* Per bit usage tracker for a u32 mask.
*
* Used for optimal handling of guest properties and event filter.
*/
struct vbg_bit_usage_tracker {
/** Per bit usage counters. */
u32 per_bit_usage[32];
/** The current mask according to per_bit_usage. */
u32 mask;
};
/** VBox guest device (data) extension. */
struct vbg_dev {
struct device *dev;
/** The base of the adapter I/O ports. */
u16 io_port;
/** Pointer to the mapping of the VMMDev adapter memory. */
struct vmmdev_memory *mmio;
/** Host version */
char host_version[64];
/** Host features */
unsigned int host_features;
/**
* Dummy page and vmap address for reserved kernel virtual-address
* space for the guest mappings, only used on hosts lacking vtx.
*/
struct page *guest_mappings_dummy_page;
void *guest_mappings;
/** Spinlock protecting pending_events. */
spinlock_t event_spinlock;
/** Preallocated struct vmmdev_events for the IRQ handler. */
struct vmmdev_events *ack_events_req;
/** Wait-for-event list for threads waiting for multiple events. */
wait_queue_head_t event_wq;
/** Mask of pending events. */
u32 pending_events;
/** Wait-for-event list for threads waiting on HGCM async completion. */
wait_queue_head_t hgcm_wq;
/** Pre-allocated hgcm cancel2 req. for cancellation on timeout */
struct vmmdev_hgcm_cancel2 *cancel_req;
/** Mutex protecting cancel_req accesses */
struct mutex cancel_req_mutex;
/** Pre-allocated mouse-status request for the input-device handling. */
struct vmmdev_mouse_status *mouse_status_req;
/** Input device for reporting abs mouse coordinates to the guest. */
struct input_dev *input;
/** Memory balloon information. */
struct vbg_mem_balloon mem_balloon;
/** Lock for session related items in vbg_dev and vbg_session */
struct mutex session_mutex;
/** Events we won't permit anyone to filter out. */
u32 fixed_events;
/**
* Usage counters for the host events (excludes fixed events),
* Protected by session_mutex.
*/
struct vbg_bit_usage_tracker event_filter_tracker;
/**
* The event filter last reported to the host (or UINT32_MAX).
* Protected by session_mutex.
*/
u32 event_filter_host;
/**
* Usage counters for guest capabilities. Indexed by capability bit
* number, one count per session using a capability.
* Protected by session_mutex.
*/
struct vbg_bit_usage_tracker guest_caps_tracker;
/**
* The guest capabilities last reported to the host (or UINT32_MAX).
* Protected by session_mutex.
*/
u32 guest_caps_host;
/**
* Heartbeat timer which fires with interval
* cNsHearbeatInterval and its handler sends
* VMMDEVREQ_GUEST_HEARTBEAT to VMMDev.
*/
struct timer_list heartbeat_timer;
/** Heartbeat timer interval in ms. */
int heartbeat_interval_ms;
/** Preallocated VMMDEVREQ_GUEST_HEARTBEAT request. */
struct vmmdev_request_header *guest_heartbeat_req;
/** "vboxguest" char-device */
struct miscdevice misc_device;
/** "vboxuser" char-device */
struct miscdevice misc_device_user;
};
/** The VBoxGuest per session data. */
struct vbg_session {
/** Pointer to the device extension. */
struct vbg_dev *gdev;
/**
* Array containing HGCM client IDs associated with this session.
* These will be automatically disconnected when the session is closed.
* Protected by vbg_gdev.session_mutex.
*/
u32 hgcm_client_ids[64];
/**
* Host events requested by the session.
* An event type requested in any guest session will be added to the
* host filter. Protected by vbg_gdev.session_mutex.
*/
u32 event_filter;
/**
* Guest capabilities for this session.
* A capability claimed by any guest session will be reported to the
* host. Protected by vbg_gdev.session_mutex.
*/
u32 guest_caps;
/** Does this session belong to a root process or a user one? */
bool user_session;
/** Set on CANCEL_ALL_WAITEVENTS, protected by vbg_devevent_spinlock. */
bool cancel_waiters;
};
int vbg_core_init(struct vbg_dev *gdev, u32 fixed_events);
void vbg_core_exit(struct vbg_dev *gdev);
struct vbg_session *vbg_core_open_session(struct vbg_dev *gdev, bool user);
void vbg_core_close_session(struct vbg_session *session);
int vbg_core_ioctl(struct vbg_session *session, unsigned int req, void *data);
int vbg_core_set_mouse_status(struct vbg_dev *gdev, u32 features);
irqreturn_t vbg_core_isr(int irq, void *dev_id);
void vbg_linux_mouse_event(struct vbg_dev *gdev);
#endif

466
drivers/virt/vboxguest/vboxguest_linux.c Normal file
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@ -0,0 +1,466 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* vboxguest linux pci driver, char-dev and input-device code,
*
* Copyright (C) 2006-2016 Oracle Corporation
*/
#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 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, false);
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, false);
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;
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;
/* __GFP_DMA32 because IOCTL_VMMDEV_REQUEST passes this to the host */
buf = kmalloc(size, GFP_KERNEL | __GFP_DMA32);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, (void *)arg, hdr.size_in)) {
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:
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;
int ret;
ret = vbg_core_set_mouse_status(gdev, feat);
if (ret)
return ret;
return 0;
}
/**
* 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);
/**
* 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=%p size=%d\n",
(void *)mmio, (int)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 = devm_request_irq(dev, 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_vbg_core_exit;
}
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);
device_create_file(dev, &dev_attr_host_version);
device_create_file(dev, &dev_attr_host_features);
vbg_info("vboxguest: misc device minor %d, IRQ %d, I/O port %x, MMIO at %p (size %d)\n",
gdev->misc_device.minor, pci->irq, gdev->io_port,
(void *)mmio, (int)mmio_len);
return 0;
err_unregister_misc_device_user:
misc_deregister(&gdev->misc_device_user);
err_unregister_misc_device:
misc_deregister(&gdev->misc_device);
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);
device_remove_file(gdev->dev, &dev_attr_host_features);
device_remove_file(gdev->dev, &dev_attr_host_version);
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,
.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");

19
drivers/virt/vboxguest/vboxguest_version.h Normal file
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@ -0,0 +1,19 @@
/* SPDX-License-Identifier: (GPL-2.0 OR CDDL-1.0) */
/*
* VBox Guest additions version info, this is used by the host to determine
* supported guest-addition features in some cases. So this will need to be
* synced with vbox upstreams versioning scheme when we implement / port
* new features from the upstream out-of-tree vboxguest driver.
*/
#ifndef __VBOX_VERSION_H__
#define __VBOX_VERSION_H__
/* Last synced October 4th 2017 */
#define VBG_VERSION_MAJOR 5
#define VBG_VERSION_MINOR 2
#define VBG_VERSION_BUILD 0
#define VBG_SVN_REV 68940
#define VBG_VERSION_STRING "5.2.0"
#endif