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a63f985713
This was used for ia64. But there is no working ia64 support in sight, so remove it for now. Signed-off-by: Bastian Blank <waldi@debian.org> Acked-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
436 lines
8.8 KiB
C
436 lines
8.8 KiB
C
/******************************************************************************
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* privcmd.c
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*
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* Interface to privileged domain-0 commands.
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*
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* Copyright (c) 2002-2004, K A Fraser, B Dragovic
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/uaccess.h>
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#include <linux/swap.h>
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/seq_file.h>
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#include <linux/miscdevice.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/tlb.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include <xen/xen.h>
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#include <xen/privcmd.h>
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#include <xen/interface/xen.h>
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#include <xen/features.h>
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#include <xen/page.h>
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#include <xen/xen-ops.h>
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#include "privcmd.h"
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MODULE_LICENSE("GPL");
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#ifndef HAVE_ARCH_PRIVCMD_MMAP
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static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma);
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#endif
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static long privcmd_ioctl_hypercall(void __user *udata)
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{
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struct privcmd_hypercall hypercall;
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long ret;
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if (copy_from_user(&hypercall, udata, sizeof(hypercall)))
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return -EFAULT;
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ret = privcmd_call(hypercall.op,
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hypercall.arg[0], hypercall.arg[1],
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hypercall.arg[2], hypercall.arg[3],
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hypercall.arg[4]);
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return ret;
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}
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static void free_page_list(struct list_head *pages)
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{
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struct page *p, *n;
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list_for_each_entry_safe(p, n, pages, lru)
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__free_page(p);
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INIT_LIST_HEAD(pages);
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}
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/*
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* Given an array of items in userspace, return a list of pages
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* containing the data. If copying fails, either because of memory
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* allocation failure or a problem reading user memory, return an
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* error code; its up to the caller to dispose of any partial list.
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*/
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static int gather_array(struct list_head *pagelist,
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unsigned nelem, size_t size,
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void __user *data)
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{
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unsigned pageidx;
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void *pagedata;
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int ret;
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if (size > PAGE_SIZE)
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return 0;
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pageidx = PAGE_SIZE;
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pagedata = NULL; /* quiet, gcc */
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while (nelem--) {
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if (pageidx > PAGE_SIZE-size) {
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struct page *page = alloc_page(GFP_KERNEL);
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ret = -ENOMEM;
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if (page == NULL)
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goto fail;
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pagedata = page_address(page);
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list_add_tail(&page->lru, pagelist);
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pageidx = 0;
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}
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ret = -EFAULT;
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if (copy_from_user(pagedata + pageidx, data, size))
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goto fail;
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data += size;
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pageidx += size;
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}
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ret = 0;
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fail:
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return ret;
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}
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/*
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* Call function "fn" on each element of the array fragmented
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* over a list of pages.
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*/
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static int traverse_pages(unsigned nelem, size_t size,
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struct list_head *pos,
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int (*fn)(void *data, void *state),
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void *state)
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{
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void *pagedata;
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unsigned pageidx;
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int ret = 0;
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BUG_ON(size > PAGE_SIZE);
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pageidx = PAGE_SIZE;
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pagedata = NULL; /* hush, gcc */
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while (nelem--) {
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if (pageidx > PAGE_SIZE-size) {
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struct page *page;
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pos = pos->next;
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page = list_entry(pos, struct page, lru);
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pagedata = page_address(page);
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pageidx = 0;
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}
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ret = (*fn)(pagedata + pageidx, state);
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if (ret)
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break;
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pageidx += size;
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}
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return ret;
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}
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struct mmap_mfn_state {
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unsigned long va;
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struct vm_area_struct *vma;
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domid_t domain;
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};
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static int mmap_mfn_range(void *data, void *state)
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{
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struct privcmd_mmap_entry *msg = data;
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struct mmap_mfn_state *st = state;
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struct vm_area_struct *vma = st->vma;
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int rc;
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/* Do not allow range to wrap the address space. */
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if ((msg->npages > (LONG_MAX >> PAGE_SHIFT)) ||
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((unsigned long)(msg->npages << PAGE_SHIFT) >= -st->va))
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return -EINVAL;
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/* Range chunks must be contiguous in va space. */
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if ((msg->va != st->va) ||
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((msg->va+(msg->npages<<PAGE_SHIFT)) > vma->vm_end))
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return -EINVAL;
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rc = xen_remap_domain_mfn_range(vma,
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msg->va & PAGE_MASK,
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msg->mfn, msg->npages,
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vma->vm_page_prot,
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st->domain);
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if (rc < 0)
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return rc;
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st->va += msg->npages << PAGE_SHIFT;
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return 0;
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}
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static long privcmd_ioctl_mmap(void __user *udata)
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{
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struct privcmd_mmap mmapcmd;
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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int rc;
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LIST_HEAD(pagelist);
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struct mmap_mfn_state state;
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if (!xen_initial_domain())
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return -EPERM;
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if (copy_from_user(&mmapcmd, udata, sizeof(mmapcmd)))
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return -EFAULT;
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rc = gather_array(&pagelist,
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mmapcmd.num, sizeof(struct privcmd_mmap_entry),
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mmapcmd.entry);
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if (rc || list_empty(&pagelist))
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goto out;
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down_write(&mm->mmap_sem);
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{
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struct page *page = list_first_entry(&pagelist,
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struct page, lru);
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struct privcmd_mmap_entry *msg = page_address(page);
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vma = find_vma(mm, msg->va);
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rc = -EINVAL;
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if (!vma || (msg->va != vma->vm_start) ||
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!privcmd_enforce_singleshot_mapping(vma))
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goto out_up;
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}
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state.va = vma->vm_start;
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state.vma = vma;
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state.domain = mmapcmd.dom;
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rc = traverse_pages(mmapcmd.num, sizeof(struct privcmd_mmap_entry),
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&pagelist,
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mmap_mfn_range, &state);
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out_up:
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up_write(&mm->mmap_sem);
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out:
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free_page_list(&pagelist);
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return rc;
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}
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struct mmap_batch_state {
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domid_t domain;
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unsigned long va;
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struct vm_area_struct *vma;
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int err;
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xen_pfn_t __user *user;
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};
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static int mmap_batch_fn(void *data, void *state)
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{
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xen_pfn_t *mfnp = data;
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struct mmap_batch_state *st = state;
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if (xen_remap_domain_mfn_range(st->vma, st->va & PAGE_MASK, *mfnp, 1,
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st->vma->vm_page_prot, st->domain) < 0) {
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*mfnp |= 0xf0000000U;
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st->err++;
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}
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st->va += PAGE_SIZE;
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return 0;
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}
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static int mmap_return_errors(void *data, void *state)
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{
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xen_pfn_t *mfnp = data;
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struct mmap_batch_state *st = state;
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return put_user(*mfnp, st->user++);
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}
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static struct vm_operations_struct privcmd_vm_ops;
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static long privcmd_ioctl_mmap_batch(void __user *udata)
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{
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int ret;
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struct privcmd_mmapbatch m;
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long nr_pages;
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LIST_HEAD(pagelist);
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struct mmap_batch_state state;
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if (!xen_initial_domain())
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return -EPERM;
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if (copy_from_user(&m, udata, sizeof(m)))
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return -EFAULT;
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nr_pages = m.num;
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if ((m.num <= 0) || (nr_pages > (LONG_MAX >> PAGE_SHIFT)))
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return -EINVAL;
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ret = gather_array(&pagelist, m.num, sizeof(xen_pfn_t),
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m.arr);
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if (ret || list_empty(&pagelist))
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goto out;
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down_write(&mm->mmap_sem);
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vma = find_vma(mm, m.addr);
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ret = -EINVAL;
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if (!vma ||
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vma->vm_ops != &privcmd_vm_ops ||
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(m.addr != vma->vm_start) ||
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((m.addr + (nr_pages << PAGE_SHIFT)) != vma->vm_end) ||
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!privcmd_enforce_singleshot_mapping(vma)) {
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up_write(&mm->mmap_sem);
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goto out;
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}
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state.domain = m.dom;
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state.vma = vma;
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state.va = m.addr;
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state.err = 0;
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ret = traverse_pages(m.num, sizeof(xen_pfn_t),
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&pagelist, mmap_batch_fn, &state);
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up_write(&mm->mmap_sem);
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if (state.err > 0) {
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state.user = m.arr;
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ret = traverse_pages(m.num, sizeof(xen_pfn_t),
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&pagelist,
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mmap_return_errors, &state);
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}
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out:
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free_page_list(&pagelist);
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return ret;
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}
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static long privcmd_ioctl(struct file *file,
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unsigned int cmd, unsigned long data)
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{
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int ret = -ENOSYS;
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void __user *udata = (void __user *) data;
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switch (cmd) {
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case IOCTL_PRIVCMD_HYPERCALL:
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ret = privcmd_ioctl_hypercall(udata);
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break;
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case IOCTL_PRIVCMD_MMAP:
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ret = privcmd_ioctl_mmap(udata);
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break;
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case IOCTL_PRIVCMD_MMAPBATCH:
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ret = privcmd_ioctl_mmap_batch(udata);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int privcmd_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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printk(KERN_DEBUG "privcmd_fault: vma=%p %lx-%lx, pgoff=%lx, uv=%p\n",
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vma, vma->vm_start, vma->vm_end,
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vmf->pgoff, vmf->virtual_address);
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return VM_FAULT_SIGBUS;
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}
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static struct vm_operations_struct privcmd_vm_ops = {
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.fault = privcmd_fault
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};
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static int privcmd_mmap(struct file *file, struct vm_area_struct *vma)
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{
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/* Unsupported for auto-translate guests. */
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return -ENOSYS;
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/* DONTCOPY is essential for Xen because copy_page_range doesn't know
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* how to recreate these mappings */
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vma->vm_flags |= VM_RESERVED | VM_IO | VM_DONTCOPY | VM_PFNMAP;
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vma->vm_ops = &privcmd_vm_ops;
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vma->vm_private_data = NULL;
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return 0;
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}
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static int privcmd_enforce_singleshot_mapping(struct vm_area_struct *vma)
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{
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return (xchg(&vma->vm_private_data, (void *)1) == NULL);
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}
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const struct file_operations xen_privcmd_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = privcmd_ioctl,
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.mmap = privcmd_mmap,
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};
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EXPORT_SYMBOL_GPL(xen_privcmd_fops);
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static struct miscdevice privcmd_dev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "xen/privcmd",
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.fops = &xen_privcmd_fops,
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};
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static int __init privcmd_init(void)
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{
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int err;
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if (!xen_domain())
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return -ENODEV;
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err = misc_register(&privcmd_dev);
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if (err != 0) {
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printk(KERN_ERR "Could not register Xen privcmd device\n");
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return err;
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}
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return 0;
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}
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static void __exit privcmd_exit(void)
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{
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misc_deregister(&privcmd_dev);
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}
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module_init(privcmd_init);
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module_exit(privcmd_exit);
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