On Tue, Aug 02, 2011 at 12:17:06PM +0300, Avi Kivity wrote:
> On 08/01/2011 10:53 PM, Michael S. Tsirkin wrote:
> >>
> >>
> >> Just because a memory region becomes visible to the cpu is no reason
> >> to have a callback. From the device perspective, it can't tell that
> >> it happened.
> >
> >BTW this is what qxl does, too, conceptually: on config writes, it peeks
> >at the bar to detect whether that got unmapped.
>
> Can you elaborate? why? what does it do?
Disables vga mapping when it sees io has been disabled.
What it really should do is check the io enable bit I think ...
vga_dirty_log_stop(vga);
pci_default_write_config(d, address, val, len);
if (vga->map_addr&& qxl->pci.io_regions[0].addr == -1) {
vga->map_addr = 0;
}
vga_dirty_log_start(vga);