From: "Michael S. Tsirkin" <mst@redhat.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Laurent Vivier <lvivier@redhat.com>,
Peter Maydell <peter.maydell@linaro.org>,
Michael Roth <mdroth@linux.vnet.ibm.com>,
QEMU Developers <qemu-devel@nongnu.org>,
"qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH v2] pci: allow 0 address for PCI IO/MEM regions
Date: Fri, 24 Jul 2015 01:42:56 +0300 [thread overview]
Message-ID: <20150724014004-mutt-send-email-mst@redhat.com> (raw)
In-Reply-To: <1437688015.7562.68.camel@kernel.crashing.org>
On Fri, Jul 24, 2015 at 07:46:55AM +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2015-07-23 at 22:00 +0100, Peter Maydell wrote:
> > (Also, none of our PCI device models actually try to do
> > the "BAR at zero means I won't respond" behaviour, which
> > presumably they might do in real life.)
>
> Devices aren't supposed to do that ... In fact, I don't see HW designers
> adding a comparator if they don't have to :-)
>
> Cheers,
> Ben.
>
You never can tell with HW designers. For example, maybe they
used this as a trick to avoid implementing memory/io enable
properly.
--
MST
next prev parent reply other threads:[~2015-07-23 22:43 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1437566099-10004-1-git-send-email-lvivier@redhat.com>
2015-07-23 18:24 ` [Qemu-devel] [PATCH v2] pci: allow 0 address for PCI IO/MEM regions Laurent Vivier
2015-07-23 18:30 ` Michael S. Tsirkin
2015-07-23 20:48 ` [Qemu-devel] [Qemu-ppc] " Benjamin Herrenschmidt
2015-07-23 21:18 ` Michael S. Tsirkin
2015-07-23 20:46 ` Benjamin Herrenschmidt
2015-07-23 21:00 ` Peter Maydell
2015-07-23 21:10 ` Michael S. Tsirkin
2015-07-23 21:19 ` Peter Maydell
2015-07-23 21:24 ` Peter Maydell
2015-07-23 21:38 ` Michael Roth
2015-07-23 21:49 ` Michael Roth
2015-07-24 8:46 ` Peter Maydell
2015-07-24 8:58 ` Laurent Vivier
2015-07-23 21:46 ` Benjamin Herrenschmidt
2015-07-23 22:42 ` Michael S. Tsirkin [this message]
2015-07-24 8:35 ` [Qemu-devel] [PATCH v3] " Laurent Vivier
2015-07-27 8:19 ` [Qemu-devel] [Qemu-ppc] " Laurent Vivier
2015-08-06 8:08 ` Laurent Vivier
2015-08-11 8:50 ` Alexander Graf
2015-08-11 9:04 ` Laurent Vivier
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