From 64c048f4a86d92078970ca5d817fd6411430b6a0 Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@redhat.com>
Date: Mon, 1 Aug 2011 11:03:42 +0300
Subject: cirrus: wrap memory update in a transaction

This prevents spurious unmapping and remapping of the vga windows,
which reduces performance.

Reviewed-by: Richard Henderson  <rth@twiddle.net>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
 hw/cirrus_vga.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'hw/cirrus_vga.c')

diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 4d0ef0d..ec7ea82 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -2424,6 +2424,7 @@ static void cirrus_update_memory_access(CirrusVGAState *s)
 {
     unsigned mode;
 
+    memory_region_transaction_begin();
     if ((s->vga.sr[0x17] & 0x44) == 0x44) {
         goto generic_io;
     } else if (s->cirrus_srcptr != s->cirrus_srcptr_end) {
@@ -2443,6 +2444,7 @@ static void cirrus_update_memory_access(CirrusVGAState *s)
             unmap_linear_vram(s);
         }
     }
+    memory_region_transaction_commit();
 }
 
 
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