Re: [Qemu-devel] [PATCH v3] hw/arm/virt: Add high MMIO PCI region

[Peter Maydell <peter.maydell@linaro.org>]

On 27 July 2015 at 16:18, Michael S. Tsirkin <mst@redhat.com> wrote:
> It's more a question of figuring out what does real hardware do.
> It's true, PIIX has this "everything that isn't memory is PCI"
> assumption. We do this for Q35 but I'm not even sure it's the
> right thing to do there.
>
> If as you say real ARM hardware doesn't work like this, then QEMU
> shouldn't do this for ARM.

Real ARM hardware might do a variety of things varying between
"we just have some windows" and "we do things exactly like
how an x86 PC does". The architecture doesn't care.

I don't know what the restrictions of the kernel's "generic
PCIe" handling are, whether it insists on specific windows
or can handle the "everything in the background is a window"
configuration as well. The dt binding doc for it implies not.

thanks
-- PMM