[Xen-devel] [PATCH v4 6/6] xen: change memory access behavior during migration.

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

From: Anthony PERARD <anthony.perard@xxxxxxxxxx>

Do not allocate RAM during INMIGRATE runstate.
Do not actually "do" set_memory during migration.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 xen-all.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/xen-all.c b/xen-all.c
index bb66c82..9a80c30 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -190,6 +190,14 @@ void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, 
MemoryRegion *mr)
     xen_pfn_t *pfn_list;
     int i;
 
+    if (runstate_check(RUN_STATE_INMIGRATE)) {
+        /* RAM already populated in Xen */
+        fprintf(stderr, "%s: do not alloc "RAM_ADDR_FMT
+                " bytes of ram at "RAM_ADDR_FMT" when runstate is INMIGRATE\n",
+                __func__, size, ram_addr); 
+        return;
+    }
+
     if (mr == &ram_memory) {
         return;
     }
@@ -255,6 +263,14 @@ static int xen_add_to_physmap(XenIOState *state,
     target_phys_addr_t phys_offset = memory_region_get_ram_addr(mr);
     char path[80], value[17];
 
+    if (runstate_check(RUN_STATE_INMIGRATE)) {
+        fprintf(stderr, "%s: do not add "RAM_ADDR_FMT
+                " bytes of ram to physmap at "RAM_ADDR_FMT
+                " when runstate is INMIGRATE\n",
+                __func__, size, start_addr); 
+        return 0;
+    }
+
     if (get_physmapping(state, start_addr, size)) {
         return 0;
     }
-- 
1.7.2.5


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