Marcelo Tosatti wrote:
> Anthony,
>
> The following sequence crashes F9 guests, when using VNC:
>
> # modprobe cirrusfb
> # vbetool post
>
> Results in Floating point exception at:
>
> cirrus_do_copy()
> {
>
> depth = s->get_bpp((VGAState *)s) / 8
> ...
> sx = (src % (width * depth)) / depth;
> ...
> }
>
> Problem is that ->get_bpp returns 0.
>
> Following band-aid "fixes it" (coff). I have no idea if its correct
> though ?
>
It suggests something is very broken. get_bpp only is supposed to
return 0 when in VGA mode. I don't think blitting should happen when in
VGA mode. Applying the patch is not a bad idea but what was the guest
doing when this happened? Was it in the process of transitioning from
one mode to another?
Regards,
Anthony Liguori
> "vbetool post" corrupts both SDL and VNC displays when using cirrusfb,
> but seems a separate problem.
>
>
> diff --git a/qemu/hw/cirrus_vga.c b/qemu/hw/cirrus_vga.c
> index e14ec35..9f860ff 100644
> --- a/qemu/hw/cirrus_vga.c
> +++ b/qemu/hw/cirrus_vga.c
> @@ -709,6 +709,8 @@ static void cirrus_do_copy(CirrusVGAState *s, int dst,
> int src, int w, in int notify = 0;
>
> depth = s->get_bpp((VGAState *)s) / 8;
> + if (!depth)
> + depth = 1;
> s->get_resolution((VGAState *)s, &width, &height);
>
> /* extra x, y */
>
>
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