LXR linux/arch/x86/xen/mmu.c

   1// SPDX-License-Identifier: GPL-2.0
   2
   3#include <linux/pfn.h>
   4#include <asm/xen/page.h>
   5#include <asm/xen/hypercall.h>
   6#include <xen/interface/memory.h>
   7
   8#include "multicalls.h"
   9#include "mmu.h"
  10
  11unsigned long arbitrary_virt_to_mfn(void *vaddr)
  12{
  13        xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
  14
  15        return PFN_DOWN(maddr.maddr);
  16}
  17
  18xmaddr_t arbitrary_virt_to_machine(void *vaddr)
  19{
  20        unsigned long address = (unsigned long)vaddr;
  21        unsigned int level;
  22        pte_t *pte;
  23        unsigned offset;
  24
  25        /*
  26         * if the PFN is in the linear mapped vaddr range, we can just use
  27         * the (quick) virt_to_machine() p2m lookup
  28         */
  29        if (virt_addr_valid(vaddr))
  30                return virt_to_machine(vaddr);
  31
  32        /* otherwise we have to do a (slower) full page-table walk */
  33
  34        pte = lookup_address(address, &level);
  35        BUG_ON(pte == NULL);
  36        offset = address & ~PAGE_MASK;
  37        return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
  38}
  39EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
  40
  41/* Returns: 0 success */
  42int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
  43                               int nr, struct page **pages)
  44{
  45        if (xen_feature(XENFEAT_auto_translated_physmap))
  46                return xen_xlate_unmap_gfn_range(vma, nr, pages);
  47
  48        if (!pages)
  49                return 0;
  50
  51        return -EINVAL;
  52}
  53EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
  54