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From: Pavel Fedin <p.fedin@samsung.com>
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Date: Wed, 29 Jul 2015 12:45:34 +0300
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Subject: Re: [Qemu-devel] [PATCH v3] hw/arm/virt: Add high MMIO PCI region
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To: 'Peter Maydell' <peter.maydell@linaro.org>
Cc: 'Igor Mammedov' <imammedo@redhat.com>, 'Alexander Graf' <agraf@suse.de>, "'Michael S. Tsirkin'" <mst@redhat.com>, 'QEMU Developers' <qemu-devel@nongnu.org>, 'Paolo Bonzini' <pbonzini@redhat.com>

> > because i discovered problems with 32-bit guests. They simply =
truncate
> > high word and end up in attempt to put PCI at 0x00000000 - =
0xFFFFFFFF, fail,
> > and do not work of course. So, my next version will have high MMIO
> > only for 64-bit guests.
>=20
> That sounds like a guest bug to me. If the device tree says that
> addresses are two-cells wide then the code reading it ought to
> read both cells, not just ignore the top 32 bits...

 May be. It's old kernel, v3.19, but still it works as it works. We =
could, of course, have some machine option, but personally i currently =
care only about 64 bits, so for simplicity let's leave alone 32 bits for =
now. When more important things are settled down, adding an option will =
not be a problem.
=20
Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia