exec: Change RAMBlockIterFunc definition

Currently, qemu_ram_foreach_* calls RAMBlockIterFunc with many
block-specific arguments. But often iter func needs RAMBlock*.
This refactoring is needed for fast access to RAMBlock flags from
qemu_ram_foreach_block's callback. The only way to achieve this now
is to call qemu_ram_block_from_host (which also enumerates blocks).

So, this patch reduces complexity of
qemu_ram_foreach_block() -> cb() -> qemu_ram_block_from_host()
from O(n^2) to O(n).

Fix RAMBlockIterFunc definition and add some functions to read
RAMBlock* fields witch were passed.

Signed-off-by: Yury Kotov <yury-kotov@yandex-team.ru>
Message-Id: <20190215174548.2630-2-yury-kotov@yandex-team.ru>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/stubs/ram-block.c b/stubs/ram-block.c
index cfa5d86..73c0a3e 100644
--- a/stubs/ram-block.c
+++ b/stubs/ram-block.c
@@ -2,6 +2,21 @@
 #include "exec/ramlist.h"
 #include "exec/cpu-common.h"
 
+void *qemu_ram_get_host_addr(RAMBlock *rb)
+{
+    return 0;
+}
+
+ram_addr_t qemu_ram_get_offset(RAMBlock *rb)
+{
+    return 0;
+}
+
+ram_addr_t qemu_ram_get_used_length(RAMBlock *rb)
+{
+    return 0;
+}
+
 void ram_block_notifier_add(RAMBlockNotifier *n)
 {
 }