Re: [Qemu-devel] Virtualbox svga card in KVM

[Gerd Hoffmann]

On 04/18/13 18:58, Sriram Murthy wrote:
> Some updates on this - I changed the PCI Device ID and Vendor ID in
> hw/vga.c, and was able to get the VirtualBox SVGA card driver
> installed in WinXP running on KVM. However, when I try to change the
> resolution, KVM crashes with a SIGFPE in vbe_ioport_write_data(), and
> this is due to line_offset being zero in this statement -
> 
> h = s->vram_size / line_offset Also, I am seeing that the line_offset
> is computed by reading the vbe_regs. So, is it that the driver in
> the guest is programming the vbe regs?.

Seems so, it crashes in a code path which actually writes to one of the
vbe regs.

> What should be the line_offset value, if the desired resolution is
> 800x600? Regards, Sriram

Depends on the desired depth.  The guest didn't set the depth register
though, thats why qemu is crashing ...

Maybe virtualbox uses another register layout.

cheers,
  Gerd