From: Paolo Bonzini <pbonzini@redhat.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Peter Maydell <peter.maydell@linaro.org>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC][PATCH 0/21] QEMU Object Model
Date: Thu, 28 Jul 2011 16:41:24 +0200 [thread overview]
Message-ID: <4E317514.30505@redhat.com> (raw)
In-Reply-To: <4E316C36.1050405@codemonkey.ws>
On 07/28/2011 04:03 PM, Anthony Liguori wrote:
>> No doubt about that. :) I'd put a lot more hope into Goldfish though.
>
> What's unclear to me about the Goldfish enumerator is whether it should
> be filled out through interaction with hardware devices or via some
> other mechanism.
>
> In many ways, it's similar to ACPI and a Device Tree. In both of those
> cases, firmware actually is responsible for constructing those tables.
Yes, it is a flat device tree.
Since it supports hotplug (at least in theory, the Android emulator
predates qdev so it doesn't support it), I would say it is more similar
to PCI configuration space. The difference is that IRQ numbers and MMIO
base addresses are handed out by hardware (by a piece of the SoC) rather
than by the firmware.
So yes, the hardware would have some kind of bus to talk to the devices
and arbitrate hotplug/hotunplug. The only peculiarity being that the
bus enumerator hardcodes itself in the list it exposes, in addition to
the devices on the bus.
But that still means that the devices have two views:
1) the enumerator's view is either "this is my name, my MMIO base, my
IRQ base" or "I need 4k of MMIO and 1 IRQ line, please tell me
where/which are those", depending on the device;
2) the PIC's view is "please bring this IRQ line up/down" (the device
says which line, since the enumerator can assign those dynamically).
The PIC's view is more complicated than a Pin, and more similar to ISA.
Paolo
next prev parent reply other threads:[~2011-07-28 14:41 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-25 1:44 [Qemu-devel] [RFC][PATCH 0/21] QEMU Object Model Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 01/21] qom: add make infrastructure Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 02/21] qom: convert QAPI to use Qconfig build system Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 03/21] qom: Add core type system Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 04/21] qom: add Plug class Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 05/21] plug: add Plug property type Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 06/21] plug: add socket " Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 07/21] plug: add generated property types Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 08/21] qom: add plug_create QMP command Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 09/21] qom: add plug_list " Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 10/21] qom: add plug_get " Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 11/21] qom: add plug_set " Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 12/21] qom: add plug_list_props " Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 13/21] qom: add plug_destroy command Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 14/21] qom: add example qsh command Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 15/21] qom: add Device class Anthony Liguori
2011-07-27 15:10 ` Peter Maydell
2011-07-27 16:07 ` Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 16/21] qom-devices: add a Pin class Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 17/21] qom: add CharDriver class Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 18/21] qom-chrdrv: add memory character driver Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 19/21] qom-chrdrv: add Socket base class Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 20/21] qom-chrdrv: add TCPServer class Anthony Liguori
2011-07-25 1:44 ` [Qemu-devel] [PATCH 21/21] qom-chrdrv: add UnixServer Anthony Liguori
2011-07-25 11:21 ` [Qemu-devel] [RFC][PATCH 0/21] QEMU Object Model Kevin Wolf
2011-07-25 12:45 ` Anthony Liguori
2011-07-25 13:08 ` Kevin Wolf
2011-07-25 13:10 ` Anthony Liguori
2011-07-26 12:59 ` Paolo Bonzini
2011-07-26 14:02 ` Anthony Liguori
2011-07-26 14:35 ` Paolo Bonzini
2011-07-26 15:34 ` Anthony Liguori
2011-07-26 18:26 ` Paolo Bonzini
2011-07-26 19:23 ` Anthony Liguori
2011-07-27 8:55 ` Paolo Bonzini
2011-07-27 12:48 ` Anthony Liguori
2011-07-27 15:33 ` Paolo Bonzini
2011-07-27 16:19 ` Anthony Liguori
2011-07-27 16:28 ` Anthony Liguori
2011-07-27 18:51 ` Paolo Bonzini
2011-07-27 20:01 ` Anthony Liguori
2011-07-28 7:36 ` Paolo Bonzini
2011-07-28 12:46 ` Anthony Liguori
2011-07-28 13:50 ` Paolo Bonzini
2011-07-28 14:03 ` Anthony Liguori
2011-07-28 14:41 ` Paolo Bonzini [this message]
2011-07-28 15:04 ` Anthony Liguori
2011-07-28 15:47 ` Paolo Bonzini
2011-07-28 17:59 ` Anthony Liguori
2011-07-29 7:19 ` Paolo Bonzini
2011-07-27 21:33 ` Peter Maydell
2011-07-27 22:31 ` Anthony Liguori
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