[Xen-devel] [PATCH] xencomm: add support for log dirty mode

[Kouya Shimura <kouya@xxxxxxxxxxxxxx>]

Hi Keir,

I posted a similar patch a couple of weeks ago but
I got no response. So I split it and resend.

This patch is needed for live-migration for ia64 (and perhaps PPC).
On ia64, xencomm_copy_chunk_to() dirties a page bypassing a write
protection of TLB. i.e. the page isn't logged as dirty.

Thanks,
Kouya

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

diff -r e8f058b99171 xen/common/xencomm.c
--- a/xen/common/xencomm.c      Sat Apr 05 22:25:30 2008 +0100
+++ b/xen/common/xencomm.c      Mon Apr 07 15:40:47 2008 +0900
@@ -323,6 +323,7 @@ xencomm_copy_chunk_to(
                (unsigned long)xencomm_vaddr(paddr, page));
 
     memcpy(xencomm_vaddr(paddr, page), (void *)from, len);
+    xencomm_mark_dirty(xencomm_vaddr(paddr, page), len);
     put_page(page);
 
     return 0;
diff -r e8f058b99171 xen/include/xen/xencomm.h
--- a/xen/include/xen/xencomm.h Sat Apr 05 22:25:30 2008 +0100
+++ b/xen/include/xen/xencomm.h Mon Apr 07 15:40:47 2008 +0900
@@ -114,4 +114,12 @@ static inline unsigned long xencomm_inli
     xencomm_copy_from_guest(_d, _s, sizeof(*_d), _off);             \
 })
 
+#ifdef CONFIG_XENCOMM_MARK_DIRTY
+extern void xencomm_mark_dirty(unsigned long addr, unsigned int len);
+#else
+static inline void xencomm_mark_dirty(unsigned long addr, unsigned int len)
+{
+}
+#endif
+
 #endif /* __XENCOMM_H__ */

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