From 910b38e4dc4c37683c8b821e75a7f4cf095e4b21 Mon Sep 17 00:00:00 2001 From: Anthony PERARD Date: Wed, 3 Oct 2012 13:48:45 +0000 Subject: 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 Acked-by: Stefano Stabellini --- xen-all.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'xen-all.c') diff --git a/xen-all.c b/xen-all.c index f75ae9fd28..b11542c3e7 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)); + } + } +} -- cgit v1.2.1