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 --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 8995d43..498883b 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -1218,3 +1218,24 @@ 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)
+{
+}
--
Anthony PERARD