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Commit c51b3c63 authored by Juergen Gross's avatar Juergen Gross
Browse files

xen: add new hypercall buffer mapping device 



For passing arbitrary data from user land to the Xen hypervisor the
Xen tools today are using mlock()ed buffers. Unfortunately the kernel
might change access rights of such buffers for brief periods of time
e.g. for page migration or compaction, leading to access faults in the
hypervisor, as the hypervisor can't use the locks of the kernel.

In order to solve this problem add a new device node to the Xen privcmd
driver to easily allocate hypercall buffers via mmap(). The memory is
allocated in the kernel and just mapped into user space. Marked as
VM_IO the user mapping will not be subject to page migration et al.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
parent 7c63ca24

drivers/xen/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -41,4 +41,4 @@ obj-$(CONFIG_XEN_PVCALLS_FRONTEND) += pvcalls-front.o 
xen-evtchn-y				:= evtchn.o

xen-gntdev-y				:= gntdev.o

xen-gntalloc-y				:= gntalloc.o

xen-privcmd-y				:= privcmd.o
 
xen-privcmd-y				:= privcmd.o privcmd-buf.o

drivers/xen/privcmd-buf.c

0 → 100644
+210 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0 OR MIT



/******************************************************************************

 * privcmd-buf.c

 *

 * Mmap of hypercall buffers.

 *

 * Copyright (c) 2018 Juergen Gross

 */



#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/list.h>

#include <linux/miscdevice.h>

#include <linux/mm.h>

#include <linux/slab.h>



#include "privcmd.h"



MODULE_LICENSE("GPL");



static unsigned int limit = 64;

module_param(limit, uint, 0644);

MODULE_PARM_DESC(limit, "Maximum number of pages that may be allocated by "

			"the privcmd-buf device per open file");



struct privcmd_buf_private {

	struct mutex lock;

	struct list_head list;

	unsigned int allocated;

};



struct privcmd_buf_vma_private {

	struct privcmd_buf_private *file_priv;

	struct list_head list;

	unsigned int users;

	unsigned int n_pages;

	struct page *pages[];

};



static int privcmd_buf_open(struct inode *ino, struct file *file)

{

	struct privcmd_buf_private *file_priv;



	file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);

	if (!file_priv)

		return -ENOMEM;



	mutex_init(&file_priv->lock);

	INIT_LIST_HEAD(&file_priv->list);



	file->private_data = file_priv;



	return 0;

}



static void privcmd_buf_vmapriv_free(struct privcmd_buf_vma_private *vma_priv)

{

	unsigned int i;



	vma_priv->file_priv->allocated -= vma_priv->n_pages;



	list_del(&vma_priv->list);



	for (i = 0; i < vma_priv->n_pages; i++)

		if (vma_priv->pages[i])

			__free_page(vma_priv->pages[i]);



	kfree(vma_priv);

}



static int privcmd_buf_release(struct inode *ino, struct file *file)

{

	struct privcmd_buf_private *file_priv = file->private_data;

	struct privcmd_buf_vma_private *vma_priv;



	mutex_lock(&file_priv->lock);



	while (!list_empty(&file_priv->list)) {

		vma_priv = list_first_entry(&file_priv->list,

					    struct privcmd_buf_vma_private,

					    list);

		privcmd_buf_vmapriv_free(vma_priv);

	}



	mutex_unlock(&file_priv->lock);



	kfree(file_priv);



	return 0;

}



static void privcmd_buf_vma_open(struct vm_area_struct *vma)

{

	struct privcmd_buf_vma_private *vma_priv = vma->vm_private_data;



	if (!vma_priv)

		return;



	mutex_lock(&vma_priv->file_priv->lock);

	vma_priv->users++;

	mutex_unlock(&vma_priv->file_priv->lock);

}



static void privcmd_buf_vma_close(struct vm_area_struct *vma)

{

	struct privcmd_buf_vma_private *vma_priv = vma->vm_private_data;

	struct privcmd_buf_private *file_priv;



	if (!vma_priv)

		return;



	file_priv = vma_priv->file_priv;



	mutex_lock(&file_priv->lock);



	vma_priv->users--;

	if (!vma_priv->users)

		privcmd_buf_vmapriv_free(vma_priv);



	mutex_unlock(&file_priv->lock);

}



static vm_fault_t privcmd_buf_vma_fault(struct vm_fault *vmf)

{

	pr_debug("fault: vma=%p %lx-%lx, pgoff=%lx, uv=%p\n",

		 vmf->vma, vmf->vma->vm_start, vmf->vma->vm_end,

		 vmf->pgoff, (void *)vmf->address);



	return VM_FAULT_SIGBUS;

}



static const struct vm_operations_struct privcmd_buf_vm_ops = {

	.open = privcmd_buf_vma_open,

	.close = privcmd_buf_vma_close,

	.fault = privcmd_buf_vma_fault,

};



static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma)

{

	struct privcmd_buf_private *file_priv = file->private_data;

	struct privcmd_buf_vma_private *vma_priv;

	unsigned long count = vma_pages(vma);

	unsigned int i;

	int ret = 0;



	if (!(vma->vm_flags & VM_SHARED) || count > limit ||

	    file_priv->allocated + count > limit)

		return -EINVAL;



	vma_priv = kzalloc(sizeof(*vma_priv) + count * sizeof(void *),

			   GFP_KERNEL);

	if (!vma_priv)

		return -ENOMEM;



	vma_priv->n_pages = count;

	count = 0;

	for (i = 0; i < vma_priv->n_pages; i++) {

		vma_priv->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);

		if (!vma_priv->pages[i])

			break;

		count++;

	}



	mutex_lock(&file_priv->lock);



	file_priv->allocated += count;



	vma_priv->file_priv = file_priv;

	vma_priv->users = 1;



	vma->vm_flags |= VM_IO | VM_DONTEXPAND;

	vma->vm_ops = &privcmd_buf_vm_ops;

	vma->vm_private_data = vma_priv;



	list_add(&vma_priv->list, &file_priv->list);



	if (vma_priv->n_pages != count)

		ret = -ENOMEM;

	else

		for (i = 0; i < vma_priv->n_pages; i++) {

			ret = vm_insert_page(vma, vma->vm_start + i * PAGE_SIZE,

					     vma_priv->pages[i]);

			if (ret)

				break;

		}



	if (ret)

		privcmd_buf_vmapriv_free(vma_priv);



	mutex_unlock(&file_priv->lock);



	return ret;

}



const struct file_operations xen_privcmdbuf_fops = {

	.owner = THIS_MODULE,

	.open = privcmd_buf_open,

	.release = privcmd_buf_release,

	.mmap = privcmd_buf_mmap,

};

EXPORT_SYMBOL_GPL(xen_privcmdbuf_fops);



struct miscdevice xen_privcmdbuf_dev = {

	.minor = MISC_DYNAMIC_MINOR,

	.name = "xen/hypercall",

	.fops = &xen_privcmdbuf_fops,

};

drivers/xen/privcmd.c

+9 −0
Original line number Diff line number Diff line
@@ -1007,12 +1007,21 @@ static int __init privcmd_init(void) 
		pr_err("Could not register Xen privcmd device\n");

		return err;

	}



	err = misc_register(&xen_privcmdbuf_dev);

	if (err != 0) {

		pr_err("Could not register Xen hypercall-buf device\n");

		misc_deregister(&privcmd_dev);

		return err;

	}



	return 0;

}



static void __exit privcmd_exit(void)

{

	misc_deregister(&privcmd_dev);

	misc_deregister(&xen_privcmdbuf_dev);

}



module_init(privcmd_init);

drivers/xen/privcmd.h

+3 −0
Original line number Diff line number Diff line 
#include <linux/fs.h>



extern const struct file_operations xen_privcmd_fops;

extern const struct file_operations xen_privcmdbuf_fops;



extern struct miscdevice xen_privcmdbuf_dev;