Patchwork [RFC,2/8] exec: check MRU in qemu_ram_addr_from_host

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Submitter Paolo Bonzini
Date May 6, 2013, 2:25 p.m.
Message ID <1367850321-1732-3-git-send-email-pbonzini@redhat.com>
Download mbox | patch
Permalink /patch/241701/
State New
Headers show

Comments

Paolo Bonzini - May 6, 2013, 2:25 p.m.
This function is not used outside the iothread mutex, so it
can use ram_list.mru_block.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 exec.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

Patch

diff --git a/exec.c b/exec.c
index 9f324bb..8e46228 100644
--- a/exec.c
+++ b/exec.c
@@ -1404,18 +1404,26 @@  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