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c51b3c639e
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: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com>
211 lines
4.6 KiB
C
211 lines
4.6 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/******************************************************************************
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* privcmd-buf.c
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*
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* Mmap of hypercall buffers.
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*
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* Copyright (c) 2018 Juergen Gross
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*/
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#define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/list.h>
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#include <linux/miscdevice.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include "privcmd.h"
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MODULE_LICENSE("GPL");
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static unsigned int limit = 64;
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module_param(limit, uint, 0644);
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MODULE_PARM_DESC(limit, "Maximum number of pages that may be allocated by "
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"the privcmd-buf device per open file");
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struct privcmd_buf_private {
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struct mutex lock;
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struct list_head list;
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unsigned int allocated;
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};
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struct privcmd_buf_vma_private {
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struct privcmd_buf_private *file_priv;
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struct list_head list;
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unsigned int users;
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unsigned int n_pages;
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struct page *pages[];
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};
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static int privcmd_buf_open(struct inode *ino, struct file *file)
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{
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struct privcmd_buf_private *file_priv;
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file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
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if (!file_priv)
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return -ENOMEM;
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mutex_init(&file_priv->lock);
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INIT_LIST_HEAD(&file_priv->list);
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file->private_data = file_priv;
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return 0;
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}
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static void privcmd_buf_vmapriv_free(struct privcmd_buf_vma_private *vma_priv)
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{
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unsigned int i;
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vma_priv->file_priv->allocated -= vma_priv->n_pages;
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list_del(&vma_priv->list);
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for (i = 0; i < vma_priv->n_pages; i++)
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if (vma_priv->pages[i])
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__free_page(vma_priv->pages[i]);
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kfree(vma_priv);
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}
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static int privcmd_buf_release(struct inode *ino, struct file *file)
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{
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struct privcmd_buf_private *file_priv = file->private_data;
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struct privcmd_buf_vma_private *vma_priv;
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mutex_lock(&file_priv->lock);
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while (!list_empty(&file_priv->list)) {
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vma_priv = list_first_entry(&file_priv->list,
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struct privcmd_buf_vma_private,
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list);
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privcmd_buf_vmapriv_free(vma_priv);
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}
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mutex_unlock(&file_priv->lock);
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kfree(file_priv);
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return 0;
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}
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static void privcmd_buf_vma_open(struct vm_area_struct *vma)
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{
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struct privcmd_buf_vma_private *vma_priv = vma->vm_private_data;
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if (!vma_priv)
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return;
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mutex_lock(&vma_priv->file_priv->lock);
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vma_priv->users++;
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mutex_unlock(&vma_priv->file_priv->lock);
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}
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static void privcmd_buf_vma_close(struct vm_area_struct *vma)
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{
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struct privcmd_buf_vma_private *vma_priv = vma->vm_private_data;
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struct privcmd_buf_private *file_priv;
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if (!vma_priv)
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return;
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file_priv = vma_priv->file_priv;
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mutex_lock(&file_priv->lock);
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vma_priv->users--;
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if (!vma_priv->users)
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privcmd_buf_vmapriv_free(vma_priv);
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mutex_unlock(&file_priv->lock);
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}
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static vm_fault_t privcmd_buf_vma_fault(struct vm_fault *vmf)
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{
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pr_debug("fault: vma=%p %lx-%lx, pgoff=%lx, uv=%p\n",
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vmf->vma, vmf->vma->vm_start, vmf->vma->vm_end,
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vmf->pgoff, (void *)vmf->address);
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return VM_FAULT_SIGBUS;
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}
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static const struct vm_operations_struct privcmd_buf_vm_ops = {
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.open = privcmd_buf_vma_open,
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.close = privcmd_buf_vma_close,
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.fault = privcmd_buf_vma_fault,
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};
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static int privcmd_buf_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct privcmd_buf_private *file_priv = file->private_data;
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struct privcmd_buf_vma_private *vma_priv;
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unsigned long count = vma_pages(vma);
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unsigned int i;
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int ret = 0;
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if (!(vma->vm_flags & VM_SHARED) || count > limit ||
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file_priv->allocated + count > limit)
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return -EINVAL;
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vma_priv = kzalloc(sizeof(*vma_priv) + count * sizeof(void *),
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GFP_KERNEL);
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if (!vma_priv)
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return -ENOMEM;
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vma_priv->n_pages = count;
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count = 0;
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for (i = 0; i < vma_priv->n_pages; i++) {
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vma_priv->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
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if (!vma_priv->pages[i])
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break;
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count++;
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}
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mutex_lock(&file_priv->lock);
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file_priv->allocated += count;
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vma_priv->file_priv = file_priv;
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vma_priv->users = 1;
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vma->vm_flags |= VM_IO | VM_DONTEXPAND;
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vma->vm_ops = &privcmd_buf_vm_ops;
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vma->vm_private_data = vma_priv;
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list_add(&vma_priv->list, &file_priv->list);
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if (vma_priv->n_pages != count)
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ret = -ENOMEM;
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else
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for (i = 0; i < vma_priv->n_pages; i++) {
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ret = vm_insert_page(vma, vma->vm_start + i * PAGE_SIZE,
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vma_priv->pages[i]);
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if (ret)
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break;
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}
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if (ret)
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privcmd_buf_vmapriv_free(vma_priv);
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mutex_unlock(&file_priv->lock);
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return ret;
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}
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const struct file_operations xen_privcmdbuf_fops = {
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.owner = THIS_MODULE,
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.open = privcmd_buf_open,
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.release = privcmd_buf_release,
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.mmap = privcmd_buf_mmap,
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};
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EXPORT_SYMBOL_GPL(xen_privcmdbuf_fops);
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struct miscdevice xen_privcmdbuf_dev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "xen/hypercall",
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.fops = &xen_privcmdbuf_fops,
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};
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