From aa69b6b2a32fc5460fc715f424cd21e88e971f88 Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@redhat.com>
Date: Mon, 1 Aug 2011 11:03:42 +0300
Subject: [PATCH] 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(+)

diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 4d0ef0d54c..ec7ea8207b 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();
 }
 
 
-- 
2.34.1