From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:47246)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <peter.maydell@linaro.org>) id 1UwBkV-0002K8-Gj
	for qemu-devel@nongnu.org; Mon, 08 Jul 2013 09:45:05 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <peter.maydell@linaro.org>) id 1UwBkT-0007sW-CH
	for qemu-devel@nongnu.org; Mon, 08 Jul 2013 09:45:03 -0400
Received: from mail-lb0-f174.google.com ([209.85.217.174]:39558)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <peter.maydell@linaro.org>) id 1UwBQP-0001d8-AB
	for qemu-devel@nongnu.org; Mon, 08 Jul 2013 09:24:17 -0400
Received: by mail-lb0-f174.google.com with SMTP id x10so3755154lbi.33
	for <qemu-devel@nongnu.org>; Mon, 08 Jul 2013 06:24:16 -0700 (PDT)
MIME-Version: 1.0
In-Reply-To: <83A07262-ED9A-4E5A-BC11-5B357F5B4996@suse.de>
References: <1372338255-3934-1-git-send-email-peter.maydell@linaro.org>
	<BEE369B2-DC84-40C6-A28B-F5BF81D0E7D4@suse.de>
	<39E5AB85-E7DD-4B9F-9F6F-F80CA6FCAC11@suse.de>
	<CAFEAcA8JAMeTKNwQakGGfTeYOc8BiScx6V1kNV3Jk5ACpf1C1Q@mail.gmail.com>
	<83A07262-ED9A-4E5A-BC11-5B357F5B4996@suse.de>
From: Peter Maydell <peter.maydell@linaro.org>
Date: Mon, 8 Jul 2013 14:23:56 +0100
Message-ID: <CAFEAcA9h-yax8JYax2FpFJ=S3LiThvoqsTmpCCxHVYbNfNzS=w@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Subject: Re: [Qemu-devel] [PATCH 0/8] Add virtio-mmio and use it in vexpress
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Alexander Graf <agraf@suse.de>
Cc: Anthony Liguori <aliguori@us.ibm.com>, patches@linaro.org, qemu-devel@nongnu.org, David Gibson <david@gibson.dropbear.id.au>, kvmarm@lists.cs.columbia.edu, KONRAD Frederic <fred.konrad@greensocs.com>

On 8 July 2013 14:16, Alexander Graf <agraf@suse.de> wrote:
>
> On 08.07.2013, at 15:08, Peter Maydell wrote:
>
>> On 8 July 2013 13:59, Alexander Graf <agraf@suse.de> wrote:
>>> On 08.07.2013, at 14:57, Alexander Graf wrote:
>>>> On 27.06.2013, at 15:04, Peter Maydell wrote:
>>>>> The basic idea is that the board instantiates some transports,
>>>>
>>>> I really dislike that idea. Couldn't you also create a new
>>>> bus for your vexpress platform and add a virtio-mmio-vexpress
>>>> device that automatically allocates an interrupt from the main
>>>> PIC on instantiation? That way you could create transports
>>>> using -device.
>>
>> This doesn't seem to gain anything except that the user has
>> to use -device twice rather than once.
>
> Yes, it does. You can have other devices than just virtio ones
> on those IRQ lines. Assigned devices for example.

Now I'm completely confused. Why would assigned devices
have anything to do with this? Can you explain in more
detail, because I don't really see what you're suggesting?

>> As far as I know there's no way to find out at board
>> construction how many virtio devices you might want.
>
> Hence you shouldn't create them :).

You've got to create them sometime...

-- PMM