commit 910b38e4dc4c37683c8b821e75a7f4cf095e4b21
author Anthony PERARD <anthony.perard@citrix.com> Wed Oct 03 13:48:45 2012 +0000
committer Stefano Stabellini <stefano.stabellini@eu.citrix.com> Wed Oct 03 13:48:45 2012 +0000
tree 798f32bed8bb24e636fe84fb6ca95a7021b02644
parent 39f42439d0629d3921629dc4b38e68df8f2f7b83

xen: Introduce xen_modified_memory.

This function is to be used during live migration. Every write access to the
guest memory should call this funcion so the Xen tools knows which pages are
dirty.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

xen-all.c

diff --git a/xen-all.c b/xen-all.c
index f75ae9f..b11542c 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -1228,3 +1228,24 @@
     /* destroy the domain */
     qemu_system_shutdown_request();
 }
+
+void xen_modified_memory(ram_addr_t start, ram_addr_t length)
+{
+    if (unlikely(xen_in_migration)) {
+        int rc;
+        ram_addr_t start_pfn, nb_pages;
+
+        if (length == 0) {
+            length = TARGET_PAGE_SIZE;
+        }
+        start_pfn = start >> TARGET_PAGE_BITS;
+        nb_pages = ((start + length + TARGET_PAGE_SIZE - 1) >> TARGET_PAGE_BITS)
+            - start_pfn;
+        rc = xc_hvm_modified_memory(xen_xc, xen_domid, start_pfn, nb_pages);
+        if (rc) {
+            fprintf(stderr,
+                    "%s failed for "RAM_ADDR_FMT" ("RAM_ADDR_FMT"): %i, %s\n",
+                    __func__, start, nb_pages, rc, strerror(-rc));
+        }
+    }
+}