Re: [Qemu-devel] [4261] Errors while registering ioports are not fatal (Glauber Costa).

[Paul Brook]

> > If you configure two devices with the same IO port I'd expect writes to
> > go to one or both of them, or cause a CPU fault. Just like when you have
> > overlapping memory ranges. The device doesn't suddenly disappear in a
> > puff of smoke because the OS assigned overlapping IO ranges.
>
> The issue isn't the guest OS assigning overlapping IO regions.  The
> issues is that some devices (like IDE), register ioports directly
> independently of PCI regions.

This is a device bug. They shouldn't do that. This is exactly the "manual 
configuring of IO regions" you mentioned.

Paul