From: Avi Kivity <avi@redhat.com>
Date: Mon, 1 Aug 2011 08:03:42 +0000 (+0300)
Subject: cirrus: wrap memory update in a transaction
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=cf9182e2290732be9f8d4f73ba3d6f3484380450;p=qmiga%2Fqemu.git

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>
---

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();
 }