Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git...

[thirdparty/linux.git] / drivers / xen / xlate_mmu.c

diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index ba883a80b3c04db30fa08f8f21eba9f569c02598..7b1077f0abcb0839d89a299de2a9d9d60760943a 100644 (file)
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -262,3 +262,35 @@ int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
        return 0;
 }
 EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);
+
+struct remap_pfn {
+       struct mm_struct *mm;
+       struct page **pages;
+       pgprot_t prot;
+       unsigned long i;
+};
+
+static int remap_pfn_fn(pte_t *ptep, unsigned long addr, void *data)
+{
+       struct remap_pfn *r = data;
+       struct page *page = r->pages[r->i];
+       pte_t pte = pte_mkspecial(pfn_pte(page_to_pfn(page), r->prot));
+
+       set_pte_at(r->mm, addr, ptep, pte);
+       r->i++;
+
+       return 0;
+}
+
+/* Used by the privcmd module, but has to be built-in on ARM */
+int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr, unsigned long len)
+{
+       struct remap_pfn r = {
+               .mm = vma->vm_mm,
+               .pages = vma->vm_private_data,
+               .prot = vma->vm_page_prot,
+       };
+
+       return apply_to_page_range(vma->vm_mm, addr, len, remap_pfn_fn, &r);
+}
+EXPORT_SYMBOL_GPL(xen_remap_vma_range);