Signed-off-by: Denis Plotnikov <dplotni...@virtuozzo.com>
---
migration/ram.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++
migration/ram.h | 3 +++
2 files changed, 57 insertions(+)
diff --git a/migration/ram.c b/migration/ram.c
index 27d3403435..ce3dead932 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1555,6 +1555,60 @@ void ram_block_list_destroy(void)
}
}
+static int mem_protect(void *addr, uint64_t length, int prot)
+{
+ int ret = mprotect(addr, length, prot);
+
+ if (ret < 0) {
+ error_report("%s: Can't change protection on ram block at %p",
+ __func__, addr);
+ }
+
+ return ret;
+}
+
+static int ram_set_ro(void *addr, uint64_t length)
+{
+ return mem_protect(addr, length, PROT_READ);
+}
+
+static int ram_set_rw(void *addr, uint64_t length)
+{
+ return mem_protect(addr, length, PROT_READ | PROT_WRITE);
+}
+
+int ram_block_list_set_readonly(void)
+{
+ RAMBlock *block = NULL;
+ RamBlockList *block_list = ram_bgs_block_list_get();
+ int ret = 0;
+
+ QLIST_FOREACH(block, block_list, bgs_next) {
+ ret = ram_set_ro(block->host, block->used_length);
+ if (ret) {
+ break;
+ }
+ }
+
+ return ret;
+}
+
+int ram_block_list_set_writable(void)
+{
+ RAMBlock *block = NULL;
+ RamBlockList *block_list = ram_bgs_block_list_get();
+ int ret = 0;
+
+ QLIST_FOREACH(block, block_list, bgs_next) {
+ ret = ram_set_rw(block->host, block->used_length);
+ if (ret) {
+ break;
+ }
+ }
+
+ return ret;
+}
+
static void ram_page_buffer_decrease_used(void)
{
qemu_event_reset(&ram_state->page_buffer.used_decreased);
diff --git a/migration/ram.h b/migration/ram.h
index 7c802c1d7f..4c463597a5 100644
--- a/migration/ram.h
+++ b/migration/ram.h
@@ -71,4 +71,7 @@ RAMBlock *ram_bgs_block_find(uint8_t *address, ram_addr_t
*page_offset);
void *ram_page_buffer_get(void);
int ram_page_buffer_free(void *buffer);
+int ram_block_list_set_readonly(void);
+int ram_block_list_set_writable(void);
+
#endif
--
2.17.0
