diff mbox

[V2,2/5] xen: Introduce xen_modified_memory.

Message ID 1342794882-30648-3-git-send-email-anthony.perard@citrix.com
State New
Headers show

Commit Message

Anthony PERARD July 20, 2012, 2:34 p.m. UTC 
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>
---
 hw/xen.h   |    1 +
 xen-all.c  |   21 +++++++++++++++++++++
 xen-stub.c |    4 ++++
 3 files changed, 26 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/hw/xen.h b/hw/xen.h
index e5926b7..d14e92d 100644
--- a/hw/xen.h
+++ b/hw/xen.h
@@ -48,6 +48,7 @@  void xenstore_store_pv_console_info(int i, struct CharDriverState *chr);
 struct MemoryRegion;
 void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
                    struct MemoryRegion *mr);
+void xen_modified_memory(ram_addr_t start, ram_addr_t length);
 #endif
 
 struct MemoryRegion;
diff --git a/xen-all.c b/xen-all.c
index e9c7ebf..54e54cb 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -1220,3 +1220,24 @@  void xen_shutdown_fatal_error(const char *fmt, ...)
     /* 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));
+        }
+    }
+}
diff --git a/xen-stub.c b/xen-stub.c
index 5e66ba8..9214392 100644
--- a/xen-stub.c
+++ b/xen-stub.c
@@ -59,3 +59,7 @@  void xen_register_framebuffer(MemoryRegion *mr)
 void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
 {
 }
+
+void xen_modified_memory(ram_addr_t start, ram_addr_t length)
+{
+}