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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>
This commit is contained in:
Avi Kivity 2011-08-01 11:03:42 +03:00
parent 20e5758b08
commit cf9182e229
1 changed files with 2 additions and 0 deletions
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2
hw/cirrus_vga.c
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@ -2424,6 +2424,7 @@ static void cirrus_update_memory_access(CirrusVGAState *s)
{ {
unsigned mode; unsigned mode;
memory_region_transaction_begin();
if ((s->vga.sr[0x17] & 0x44) == 0x44) { if ((s->vga.sr[0x17] & 0x44) == 0x44) {
goto generic_io; goto generic_io;
} else if (s->cirrus_srcptr != s->cirrus_srcptr_end) { } 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); unmap_linear_vram(s);
} }
} }
memory_region_transaction_commit();
} }