1 files changed, 0 insertions, 446 deletions
diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c
deleted file mode 100644
index 1a6787bc9386..000000000000
--- a/drivers/lguest/lguest_user.c
+++ /dev/null
@@ -1,446 +0,0 @@
-/*P:200 This contains all the /dev/lguest code, whereby the userspace
- * launcher controls and communicates with the Guest.  For example,
- * the first write will tell us the Guest's memory layout and entry
- * point.  A read will run the Guest until something happens, such as
- * a signal or the Guest accessing a device.
-:*/
-#include <linux/uaccess.h>
-#include <linux/miscdevice.h>
-#include <linux/fs.h>
-#include <linux/sched.h>
-#include <linux/sched/mm.h>
-#include <linux/file.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-#include "lg.h"
-
-/*L:052
-  The Launcher can get the registers, and also set some of them.
-*/
-static int getreg_setup(struct lg_cpu *cpu, const unsigned long __user *input)
-{
-	unsigned long which;
-
-	/* We re-use the ptrace structure to specify which register to read. */
-	if (get_user(which, input) != 0)
-		return -EFAULT;
-
-	/*
-	 * We set up the cpu register pointer, and their next read will
-	 * actually get the value (instead of running the guest).
-	 *
-	 * The last argument 'true' says we can access any register.
-	 */
-	cpu->reg_read = lguest_arch_regptr(cpu, which, true);
-	if (!cpu->reg_read)
-		return -ENOENT;
-
-	/* And because this is a write() call, we return the length used. */
-	return sizeof(unsigned long) * 2;
-}
-
-static int setreg(struct lg_cpu *cpu, const unsigned long __user *input)
-{
-	unsigned long which, value, *reg;
-
-	/* We re-use the ptrace structure to specify which register to read. */
-	if (get_user(which, input) != 0)
-		return -EFAULT;
-	input++;
-	if (get_user(value, input) != 0)
-		return -EFAULT;
-
-	/* The last argument 'false' means we can't access all registers. */
-	reg = lguest_arch_regptr(cpu, which, false);
-	if (!reg)
-		return -ENOENT;
-
-	*reg = value;
-
-	/* And because this is a write() call, we return the length used. */
-	return sizeof(unsigned long) * 3;
-}
-
-/*L:050
- * Sending an interrupt is done by writing LHREQ_IRQ and an interrupt
- * number to /dev/lguest.
- */
-static int user_send_irq(struct lg_cpu *cpu, const unsigned long __user *input)
-{
-	unsigned long irq;
-
-	if (get_user(irq, input) != 0)
-		return -EFAULT;
-	if (irq >= LGUEST_IRQS)
-		return -EINVAL;
-
-	/*
-	 * Next time the Guest runs, the core code will see if it can deliver
-	 * this interrupt.
-	 */
-	set_interrupt(cpu, irq);
-	return 0;
-}
-
-/*L:053
- * Deliver a trap: this is used by the Launcher if it can't emulate
- * an instruction.
- */
-static int trap(struct lg_cpu *cpu, const unsigned long __user *input)
-{
-	unsigned long trapnum;
-
-	if (get_user(trapnum, input) != 0)
-		return -EFAULT;
-
-	if (!deliver_trap(cpu, trapnum))
-		return -EINVAL;
-
-	return 0;
-}
-
-/*L:040
- * Once our Guest is initialized, the Launcher makes it run by reading
- * from /dev/lguest.
- */
-static ssize_t read(struct file *file, char __user *user, size_t size,loff_t*o)
-{
-	struct lguest *lg = file->private_data;
-	struct lg_cpu *cpu;
-	unsigned int cpu_id = *o;
-
-	/* You must write LHREQ_INITIALIZE first! */
-	if (!lg)
-		return -EINVAL;
-
-	/* Watch out for arbitrary vcpu indexes! */
-	if (cpu_id >= lg->nr_cpus)
-		return -EINVAL;
-
-	cpu = &lg->cpus[cpu_id];
-
-	/* If you're not the task which owns the Guest, go away. */
-	if (current != cpu->tsk)
-		return -EPERM;
-
-	/* If the Guest is already dead, we indicate why */
-	if (lg->dead) {
-		size_t len;
-
-		/* lg->dead either contains an error code, or a string. */
-		if (IS_ERR(lg->dead))
-			return PTR_ERR(lg->dead);
-
-		/* We can only return as much as the buffer they read with. */
-		len = min(size, strlen(lg->dead)+1);
-		if (copy_to_user(user, lg->dead, len) != 0)
-			return -EFAULT;
-		return len;
-	}
-
-	/*
-	 * If we returned from read() last time because the Guest sent I/O,
-	 * clear the flag.
-	 */
-	if (cpu->pending.trap)
-		cpu->pending.trap = 0;
-
-	/* Run the Guest until something interesting happens. */
-	return run_guest(cpu, (unsigned long __user *)user);
-}
-
-/*L:025
- * This actually initializes a CPU.  For the moment, a Guest is only
- * uniprocessor, so "id" is always 0.
- */
-static int lg_cpu_start(struct lg_cpu *cpu, unsigned id, unsigned long start_ip)
-{
-	/* We have a limited number of CPUs in the lguest struct. */
-	if (id >= ARRAY_SIZE(cpu->lg->cpus))
-		return -EINVAL;
-
-	/* Set up this CPU's id, and pointer back to the lguest struct. */
-	cpu->id = id;
-	cpu->lg = container_of(cpu, struct lguest, cpus[id]);
-	cpu->lg->nr_cpus++;
-
-	/* Each CPU has a timer it can set. */
-	init_clockdev(cpu);
-
-	/*
-	 * We need a complete page for the Guest registers: they are accessible
-	 * to the Guest and we can only grant it access to whole pages.
-	 */
-	cpu->regs_page = get_zeroed_page(GFP_KERNEL);
-	if (!cpu->regs_page)
-		return -ENOMEM;
-
-	/* We actually put the registers at the end of the page. */
-	cpu->regs = (void *)cpu->regs_page + PAGE_SIZE - sizeof(*cpu->regs);
-
-	/*
-	 * Now we initialize the Guest's registers, handing it the start
-	 * address.
-	 */
-	lguest_arch_setup_regs(cpu, start_ip);
-
-	/*
-	 * We keep a pointer to the Launcher task (ie. current task) for when
-	 * other Guests want to wake this one (eg. console input).
-	 */
-	cpu->tsk = current;
-
-	/*
-	 * We need to keep a pointer to the Launcher's memory map, because if
-	 * the Launcher dies we need to clean it up.  If we don't keep a
-	 * reference, it is destroyed before close() is called.
-	 */
-	cpu->mm = get_task_mm(cpu->tsk);
-
-	/*
-	 * We remember which CPU's pages this Guest used last, for optimization
-	 * when the same Guest runs on the same CPU twice.
-	 */
-	cpu->last_pages = NULL;
-
-	/* No error == success. */
-	return 0;
-}
-
-/*L:020
- * The initialization write supplies 3 pointer sized (32 or 64 bit) values (in
- * addition to the LHREQ_INITIALIZE value).  These are:
- *
- * base: The start of the Guest-physical memory inside the Launcher memory.
- *
- * pfnlimit: The highest (Guest-physical) page number the Guest should be
- * allowed to access.  The Guest memory lives inside the Launcher, so it sets
- * this to ensure the Guest can only reach its own memory.
- *
- * start: The first instruction to execute ("eip" in x86-speak).
- */
-static int initialize(struct file *file, const unsigned long __user *input)
-{
-	/* "struct lguest" contains all we (the Host) know about a Guest. */
-	struct lguest *lg;
-	int err;
-	unsigned long args[4];
-
-	/*
-	 * We grab the Big Lguest lock, which protects against multiple
-	 * simultaneous initializations.
-	 */
-	mutex_lock(&lguest_lock);
-	/* You can't initialize twice!  Close the device and start again... */
-	if (file->private_data) {
-		err = -EBUSY;
-		goto unlock;
-	}
-
-	if (copy_from_user(args, input, sizeof(args)) != 0) {
-		err = -EFAULT;
-		goto unlock;
-	}
-
-	lg = kzalloc(sizeof(*lg), GFP_KERNEL);
-	if (!lg) {
-		err = -ENOMEM;
-		goto unlock;
-	}
-
-	/* Populate the easy fields of our "struct lguest" */
-	lg->mem_base = (void __user *)args[0];
-	lg->pfn_limit = args[1];
-	lg->device_limit = args[3];
-
-	/* This is the first cpu (cpu 0) and it will start booting at args[2] */
-	err = lg_cpu_start(&lg->cpus[0], 0, args[2]);
-	if (err)
-		goto free_lg;
-
-	/*
-	 * Initialize the Guest's shadow page tables.  This allocates
-	 * memory, so can fail.
-	 */
-	err = init_guest_pagetable(lg);
-	if (err)
-		goto free_regs;
-
-	/* We keep our "struct lguest" in the file's private_data. */
-	file->private_data = lg;
-
-	mutex_unlock(&lguest_lock);
-
-	/* And because this is a write() call, we return the length used. */
-	return sizeof(args);
-
-free_regs:
-	/* FIXME: This should be in free_vcpu */
-	free_page(lg->cpus[0].regs_page);
-free_lg:
-	kfree(lg);
-unlock:
-	mutex_unlock(&lguest_lock);
-	return err;
-}
-
-/*L:010
- * The first operation the Launcher does must be a write.  All writes
- * start with an unsigned long number: for the first write this must be
- * LHREQ_INITIALIZE to set up the Guest.  After that the Launcher can use
- * writes of other values to send interrupts or set up receipt of notifications.
- *
- * Note that we overload the "offset" in the /dev/lguest file to indicate what
- * CPU number we're dealing with.  Currently this is always 0 since we only
- * support uniprocessor Guests, but you can see the beginnings of SMP support
- * here.
- */
-static ssize_t write(struct file *file, const char __user *in,
-		     size_t size, loff_t *off)
-{
-	/*
-	 * Once the Guest is initialized, we hold the "struct lguest" in the
-	 * file private data.
-	 */
-	struct lguest *lg = file->private_data;
-	const unsigned long __user *input = (const unsigned long __user *)in;
-	unsigned long req;
-	struct lg_cpu *uninitialized_var(cpu);
-	unsigned int cpu_id = *off;
-
-	/* The first value tells us what this request is. */
-	if (get_user(req, input) != 0)
-		return -EFAULT;
-	input++;
-
-	/* If you haven't initialized, you must do that first. */
-	if (req != LHREQ_INITIALIZE) {
-		if (!lg || (cpu_id >= lg->nr_cpus))
-			return -EINVAL;
-		cpu = &lg->cpus[cpu_id];
-
-		/* Once the Guest is dead, you can only read() why it died. */
-		if (lg->dead)
-			return -ENOENT;
-	}
-
-	switch (req) {
-	case LHREQ_INITIALIZE:
-		return initialize(file, input);
-	case LHREQ_IRQ:
-		return user_send_irq(cpu, input);
-	case LHREQ_GETREG:
-		return getreg_setup(cpu, input);
-	case LHREQ_SETREG:
-		return setreg(cpu, input);
-	case LHREQ_TRAP:
-		return trap(cpu, input);
-	default:
-		return -EINVAL;
-	}
-}
-
-static int open(struct inode *inode, struct file *file)
-{
-	file->private_data = NULL;
-
-	return 0;
-}
-
-/*L:060
- * The final piece of interface code is the close() routine.  It reverses
- * everything done in initialize().  This is usually called because the
- * Launcher exited.
- *
- * Note that the close routine returns 0 or a negative error number: it can't
- * really fail, but it can whine.  I blame Sun for this wart, and K&R C for
- * letting them do it.
-:*/
-static int close(struct inode *inode, struct file *file)
-{
-	struct lguest *lg = file->private_data;
-	unsigned int i;
-
-	/* If we never successfully initialized, there's nothing to clean up */
-	if (!lg)
-		return 0;
-
-	/*
-	 * We need the big lock, to protect from inter-guest I/O and other
-	 * Launchers initializing guests.
-	 */
-	mutex_lock(&lguest_lock);
-
-	/* Free up the shadow page tables for the Guest. */
-	free_guest_pagetable(lg);
-
-	for (i = 0; i < lg->nr_cpus; i++) {
-		/* Cancels the hrtimer set via LHCALL_SET_CLOCKEVENT. */
-		hrtimer_cancel(&lg->cpus[i].hrt);
-		/* We can free up the register page we allocated. */
-		free_page(lg->cpus[i].regs_page);
-		/*
-		 * Now all the memory cleanups are done, it's safe to release
-		 * the Launcher's memory management structure.
-		 */
-		mmput(lg->cpus[i].mm);
-	}
-
-	/*
-	 * If lg->dead doesn't contain an error code it will be NULL or a
-	 * kmalloc()ed string, either of which is ok to hand to kfree().
-	 */
-	if (!IS_ERR(lg->dead))
-		kfree(lg->dead);
-	/* Free the memory allocated to the lguest_struct */
-	kfree(lg);
-	/* Release lock and exit. */
-	mutex_unlock(&lguest_lock);
-
-	return 0;
-}
-
-/*L:000
- * Welcome to our journey through the Launcher!
- *
- * The Launcher is the Host userspace program which sets up, runs and services
- * the Guest.  In fact, many comments in the Drivers which refer to "the Host"
- * doing things are inaccurate: the Launcher does all the device handling for
- * the Guest, but the Guest can't know that.
- *
- * Just to confuse you: to the Host kernel, the Launcher *is* the Guest and we
- * shall see more of that later.
- *
- * We begin our understanding with the Host kernel interface which the Launcher
- * uses: reading and writing a character device called /dev/lguest.  All the
- * work happens in the read(), write() and close() routines:
- */
-static const struct file_operations lguest_fops = {
-	.owner	 = THIS_MODULE,
-	.open	 = open,
-	.release = close,
-	.write	 = write,
-	.read	 = read,
-	.llseek  = default_llseek,
-};
-/*:*/
-
-/*
- * This is a textbook example of a "misc" character device.  Populate a "struct
- * miscdevice" and register it with misc_register().
- */
-static struct miscdevice lguest_dev = {
-	.minor	= MISC_DYNAMIC_MINOR,
-	.name	= "lguest",
-	.fops	= &lguest_fops,
-};
-
-int __init lguest_device_init(void)
-{
-	return misc_register(&lguest_dev);
-}
-
-void __exit lguest_device_remove(void)
-{
-	misc_deregister(&lguest_dev);
-}