Derek Murray
2007-Mar-19 10:40 UTC
[Xen-devel] [PATCH 3/3] [RFC] User-space grant table device - changes to PV linux
Changes to the paravirtualised version of Linux to add a hook before
the page table is cleared, for use with the grant-table device.
Signed-off-by: Derek Murray <Derek.Murray@cl.cam.ac.uk>
---
diff -r 809f36b1b685 linux-2.6-xen-sparse/include/linux/mm.h
--- a/linux-2.6-xen-sparse/include/linux/mm.h Thu Mar 15 10:43:13
2007 +0000
+++ b/linux-2.6-xen-sparse/include/linux/mm.h Thu Mar 15 17:46:06
2007 +0000
@@ -205,6 +205,7 @@ struct vm_operations_struct {
/* notification that a previously read-only page is about to become
* writable, if an error is returned it will cause a SIGBUS */
int (*page_mkwrite)(struct vm_area_struct *vma, struct page *page);
+ void (*unmap_page_range)(struct vm_area_struct *vma);
#ifdef CONFIG_NUMA
int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new);
struct mempolicy *(*get_policy)(struct vm_area_struct *vma,
diff -r 809f36b1b685 linux-2.6-xen-sparse/mm/memory.c
--- a/linux-2.6-xen-sparse/mm/memory.c Thu Mar 15 10:43:13 2007 +0000
+++ b/linux-2.6-xen-sparse/mm/memory.c Thu Mar 15 17:46:06 2007 +0000
@@ -755,6 +755,15 @@ static unsigned long unmap_page_range(st
details = NULL;
BUG_ON(addr >= end);
+
+ /*
+ * If specified, call the following hook to perform any unmapping
+ * operations before the PTEs are destroyed.
+ */
+ if (vma->vm_ops)
+ if (unlikely(vma->vm_ops->unmap_page_range))
+ vma->vm_ops->unmap_page_range(vma);
+
tlb_start_vma(tlb, vma);
pgd = pgd_offset(vma->vm_mm, addr);
do {
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