[Qemu-devel] regression introduced by cirrus_vga.c commit r6622?

[Marcelo Tosatti <mtosatti@redhat.com>]

Installation of CentOS5 and FC8 crash with kvm-userspace, since commit
6622:

------------------------------------------------------------------------
r6622 | aliguori | 2009-02-16 11:59:35 -0300 (Mon, 16 Feb 2009) | 14
lines

Fix hardware accelerated video to video copy on Cirrus VGA (Brian Kress)

cirrus_do_copy() in hw/cirrus_vga.c seems to make some incorrect
assumptions about video memory layout. It tries to convert addresses
to coordinates assuming that one row of data is (width * depth) bytes
long. The correct way seems to be to use the pitch fields in the
CirrusVGAState structure instead.

Without this patch, I get lots of screen corruption when I try to drag
a window under X as it's passing the wrong coordinates to the display
surface for the copy. With this patch I can drag a window with no screen
corruption.

Signed-off-by: Brian Kress <kressb@moose.net>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Index: hw/cirrus_vga.c
===================================================================
--- hw/cirrus_vga.c	(revision 6621)
+++ hw/cirrus_vga.c	(revision 6622)
@@ -730,10 +730,10 @@
     s->get_resolution((VGAState *)s, &width, &height);
 
     /* extra x, y */
-    sx = (src % (width * depth)) / depth;
-    sy = (src / (width * depth));
-    dx = (dst % (width *depth)) / depth;
-    dy = (dst / (width * depth));
+    sx = (src % ABS(s->cirrus_blt_srcpitch)) / depth;
+    sy = (src / ABS(s->cirrus_blt_srcpitch));
+    dx = (dst % ABS(s->cirrus_blt_dstpitch)) / depth;
+    dy = (dst / ABS(s->cirrus_blt_dstpitch));
 
     /* normalize width */
     w /= depth;




(gdb) bt
#0  0x0000000000435b99 in vga_draw_line24_32 (s1=<value optimized out>, 
    d=0x7f3d90d59000 "", 
    s=0x7f3db190baf7
"��������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������"...,
width=<value optimized out>)
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/vga_template.h:484
#1  0x0000000000439427 in vga_draw_graphic (full_update=0)
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/vga.c:1760
#2  vga_update_display (opaque=<value optimized out>)
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/vga.c:1856
#3  0x000000000045d5ba in cirrus_do_copy ()
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/cirrus_vga.c:767
#4  cirrus_bitblt_videotovideo_copy ()
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/cirrus_vga.c:796
#5  cirrus_bitblt_videotovideo ()
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/cirrus_vga.c:918
#6  cirrus_bitblt_start (s=0x275b240)
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/cirrus_vga.c:1059
#7  0x000000000045d7dd in cirrus_write_bitblt ()
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/cirrus_vga.c:1080
#8  cirrus_hook_write_gr (s=0x275b240, reg_index=2429917328,
reg_value=227)
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/cirrus_vga.c:1585
#9  0x000000000045f226 in cirrus_mmio_writel (opaque=0x7f3db190baf7, 
    addr=139902399647744, val=4294967042)
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/hw/cirrus_vga.c:3055
#10 0x00000000004bbdb9 in cpu_physical_memory_rw (addr=4060086592, 
    buf=0x7f3d90d56028 <Address 0x7f3d90d56028 out of bounds>, len=4,
is_write=1)
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/exec.c:2993
#11 0x0000000000519948 in kvm_mmio_write (opaque=<value optimized out>, 
    addr=139902948784887, data=0x7f3d90d59000 "", len=15591907)
    at
/root/git/kvm-autotest/client/tests/kvm_runtest/root/src/kvmuser/qemu/qemu-kvm.c:708
#12 0x00000000005464da in handle_mmio (kvm=0x247d010,
kvm_run=0x7f3d90d56000)
    at libkvm.c:822