Allocate and free vmalloc areas

Allocate/release a chunk of vmalloc address space:
 alloc_vm_area reserves a chunk of address space, and makes sure all
 the pagetables are constructed for that address range - but no pages.

 free_vm_area releases the address space range.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Cc: "Jan Beulich" <JBeulich@novell.com>
Cc: "Andi Kleen" <ak@muc.de>

2 files changed, 57 insertions, 0 deletions

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 132b260aef1e..c2b10cae5da5 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -70,6 +70,10 @@ extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
                         struct page ***pages);
 extern void unmap_kernel_range(unsigned long addr, unsigned long size);
 
+/* Allocate/destroy a 'vmalloc' VM area. */
+extern struct vm_struct *alloc_vm_area(size_t size);
+extern void free_vm_area(struct vm_struct *area);
+
 /*
  *      Internals.  Dont't use..
  */
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 8e05a11155c9..3130c343088f 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -767,3 +767,56 @@ EXPORT_SYMBOL(remap_vmalloc_range);
 void  __attribute__((weak)) vmalloc_sync_all(void)
 {
 }
+
+
+static int f(pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
+{
+        /* apply_to_page_range() does all the hard work. */
+        return 0;
+}
+
+/**
+ *      alloc_vm_area - allocate a range of kernel address space
+ *      @size:          size of the area
+ *      @returns:       NULL on failure, vm_struct on success
+ *
+ *      This function reserves a range of kernel address space, and
+ *      allocates pagetables to map that range.  No actual mappings
+ *      are created.  If the kernel address space is not shared
+ *      between processes, it syncs the pagetable across all
+ *      processes.
+ */
+struct vm_struct *alloc_vm_area(size_t size)
+{
+        struct vm_struct *area;
+
+        area = get_vm_area(size, VM_IOREMAP);
+        if (area == NULL)
+                return NULL;
+
+        /*
+         * This ensures that page tables are constructed for this region
+         * of kernel virtual address space and mapped into init_mm.
+         */
+        if (apply_to_page_range(&init_mm, (unsigned long)area->addr,
+                                area->size, f, NULL)) {
+                free_vm_area(area);
+                return NULL;
+        }
+
+        /* Make sure the pagetables are constructed in process kernel
+           mappings */
+        vmalloc_sync_all();
+
+        return area;
+}
+EXPORT_SYMBOL_GPL(alloc_vm_area);
+
+void free_vm_area(struct vm_struct *area)
+{
+        struct vm_struct *ret;
+        ret = remove_vm_area(area->addr);
+        BUG_ON(ret != area);
+        kfree(area);
+}
+EXPORT_SYMBOL_GPL(free_vm_area);