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[Qemu-devel] [PATCH V2 2/5] xen: Introduce xen_modified_memory.
From: |
Anthony PERARD |
Subject: |
[Qemu-devel] [PATCH V2 2/5] xen: Introduce xen_modified_memory. |
Date: |
Fri, 20 Jul 2012 15:34:39 +0100 |
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 <address@hidden>
---
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 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)
+{
+}
--
Anthony PERARD
- [Qemu-devel] [PATCH V2 0/5] Xen, introducing dirty log for migration., Anthony PERARD, 2012/07/20
- [Qemu-devel] [PATCH V2 5/5] xen: Always set the vram dirty during migration., Anthony PERARD, 2012/07/20
- [Qemu-devel] [PATCH V2 2/5] xen: Introduce xen_modified_memory.,
Anthony PERARD <=
- [Qemu-devel] [PATCH V2 1/5] QMP, Introduce xen-set-global-dirty-log command., Anthony PERARD, 2012/07/20
- [Qemu-devel] [PATCH V2 4/5] exec, memory: Call to xen_modified_memory., Anthony PERARD, 2012/07/20
- [Qemu-devel] [PATCH V2 3/5] exec: Introduce helper to set dirty flags., Anthony PERARD, 2012/07/20