From: Alexander Gordeev <agordeev@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Andrew Jones <drjones@redhat.com>,
QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space
Date: Tue, 13 Oct 2015 07:31:03 +0100 [thread overview]
Message-ID: <20151013063057.GA32581@agordeev.usersys.redhat.com> (raw)
In-Reply-To: <CAFEAcA-EvesCxofDnSGGzwDxi2+5wJ+kXE4xGjrh45tVue+6dA@mail.gmail.com>
On Mon, Oct 12, 2015 at 10:03:03PM +0100, Peter Maydell wrote:
> On 12 October 2015 at 21:55, Alexander Gordeev <agordeev@redhat.com> wrote:
> > Currently PCI IO address 0 is not allowed even though
> > the IO space starts from 0. As result, PCI IO is not
> > possible to use at all.
>
> I don't see any reason for us not to allow 0 IO addresses,
> but I'm not sure how your your conclusion follows. It
> should be entirely possible to map PCI IO to some other
> address than zero in the IO window, which is what I would
> have expected the guest to do.
You are right - my changelog is incorrect. The rest of IO
space should be alright.
However, as 0 IO address is exposed via "ranges" to the guest,
it must be usable - isn't it? So it either should be allowed
or the range should be different.
Thanks!
> thanks
> -- PMM
--
Regards,
Alexander Gordeev
agordeev@redhat.com
next prev parent reply other threads:[~2015-10-13 6:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 20:55 [Qemu-devel] [PATCH] hw/arm/virt: Allow zero address for PCI IO space Alexander Gordeev
2015-10-12 21:03 ` Peter Maydell
2015-10-13 6:31 ` Alexander Gordeev [this message]
2015-10-13 8:16 ` Peter Maydell
2015-10-13 12:48 ` Alexander Gordeev
2015-10-13 12:33 ` Peter Maydell
2015-10-13 12:47 ` Laurent Vivier
2015-10-13 13:04 ` Michael S. Tsirkin
2015-10-13 13:12 ` Peter Maydell
2015-10-13 13:19 ` Michael S. Tsirkin
2015-10-13 13:25 ` Peter Maydell
2015-10-13 13:55 ` Peter Maydell
2015-10-16 8:52 ` Laurent Vivier
2015-10-16 9:13 ` Michael S. Tsirkin
2015-10-16 9:32 ` Peter Maydell
2015-10-16 9:59 ` Laurent Vivier
2015-10-13 14:35 ` [Qemu-devel] [PATCH v2] " Alexander Gordeev
2015-10-13 17:36 ` Peter Maydell
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