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(+)
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 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));
+ }
+ }
+}
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
Stefano Stabellini
2012-Oct-01 10:32 UTC
Re: [PATCH V4 2/5] xen: Introduce xen_modified_memory.
On Thu, 27 Sep 2012, Anthony PERARD wrote:> 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>> hw/xen.h | 1 + > xen-all.c | 21 +++++++++++++++++++++ > xen-stub.c | 4 ++++ > 3 files changed, 26 insertions(+) > > 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 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)); > + } > + } > +} > 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 >