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[Qemu-devel] [PATCH 25/66] exec: check MRU in qemu_ram_addr_from_host


From: Paolo Bonzini
Subject: [Qemu-devel] [PATCH 25/66] exec: check MRU in qemu_ram_addr_from_host
Date: Thu, 4 Jul 2013 17:13:21 +0200

This function is not used outside the iothread mutex, so it
can use ram_list.mru_block.

Signed-off-by: Paolo Bonzini <address@hidden>
---
 exec.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/exec.c b/exec.c
index e3ac1a1..69af46e 100644
--- a/exec.c
+++ b/exec.c
@@ -1400,18 +1400,26 @@ int qemu_ram_addr_from_host(void *ptr, ram_addr_t 
*ram_addr)
         return 0;
     }
 
+    block = ram_list.mru_block;
+    if (block && block->host && host - block->host < block->length) {
+        goto found;
+    }
+
     QTAILQ_FOREACH(block, &ram_list.blocks, next) {
         /* This case append when the block is not mapped. */
         if (block->host == NULL) {
             continue;
         }
         if (host - block->host < block->length) {
-            *ram_addr = block->offset + (host - block->host);
-            return 0;
+            goto found;
         }
     }
 
     return -1;
+
+found:
+    *ram_addr = block->offset + (host - block->host);
+    return 0;
 }
 
 /* Some of the softmmu routines need to translate from a host pointer
-- 
1.8.1.4





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