From 1cb62e3666b48ac4c6a22340165e21439919908f Mon Sep 17 00:00:00 2001 From: BALATON Zoltan Date: Sat, 20 Jun 2020 22:56:28 +0200 Subject: [PATCH] sm501: Ignore no-op blits Some guests seem to try source copy blits with same source and dest which are no-op so avoid calling pixman for these. Signed-off-by: BALATON Zoltan Reviewed-by: Peter Maydell Message-id: a2a8214dd37344dfb65f1c343ace4cff2e94f3bb.1592686588.git.balaton@eik.bme.hu Signed-off-by: Gerd Hoffmann --- hw/display/sm501.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/display/sm501.c b/hw/display/sm501.c index 5d2e019575..ad5a62bfab 100644 --- a/hw/display/sm501.c +++ b/hw/display/sm501.c @@ -788,6 +788,11 @@ static void sm501_2d_operation(SM501State *s) (rop2_source_is_pattern ? " with pattern source" : "")); } + /* Ignore no-op blits, some guests seem to do this */ + if (src_base == dst_base && src_pitch == dst_pitch && + src_x == dst_x && src_y == dst_y) { + break; + } /* Check for overlaps, this could be made more exact */ uint32_t sb, se, db, de; sb = src_base + src_x + src_y * (width + src_pitch); -- 2.11.0