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authorAnthony PERARD <anthony.perard@citrix.com>2012-10-03 13:48:45 +0000
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2012-10-03 13:48:45 +0000
commit910b38e4dc4c37683c8b821e75a7f4cf095e4b21 (patch)
tree798f32bed8bb24e636fe84fb6ca95a7021b02644 /xen-all.c
parent39f42439d0629d3921629dc4b38e68df8f2f7b83 (diff)
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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>
Diffstat (limited to 'xen-all.c')
-rw-r--r--xen-all.c21
1 files changed, 21 insertions, 0 deletions
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 @@ 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));
+ }
+ }
+}