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Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus
From: |
Cornelia Huck |
Subject: |
Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus |
Date: |
Fri, 24 Apr 2015 11:07:30 +0200 |
On Wed, 22 Apr 2015 14:21:36 +0200
Alexander Graf <address@hidden> wrote:
>
>
> > Am 22.04.2015 um 13:40 schrieb Cornelia Huck <address@hidden>:
> >
> > On Wed, 22 Apr 2015 11:14:40 +0200
> > Alexander Graf <address@hidden> wrote:
> >
> >>> On 04/22/2015 10:25 AM, Cornelia Huck wrote:
> >>> On Tue, 21 Apr 2015 21:06:42 +0200
> >>> Alexander Graf <address@hidden> wrote:
> >>>
> >>>>> On 04/17/2015 09:52 AM, Cornelia Huck wrote:
> >>>>> From: Xu Wang <address@hidden>
> >>>>>
> >>>>> We have to enable this flag to support dynamically adding devices to the
> >>>>> sysbus. This change is needed for the the upcoming diag288 watchdog.
> >>>> s390 doesn't have a "sysbus" per se. Please create a new bus type.
> >>> So what's wrong with the sysbus? I don't see why we should be different
> >>> than everyone else.
> >>
> >> The idea behind sysbus is that you have MMIO, PIO and IRQ pins
> >> connecting to a PIC. It provides a lot of infrastructure for those
> >> interfaces. S390 doesn't use any of them and instead wants registration
> >> on "diag" interfaces for example which I'd put on the same layer as PIO
> >> or MMIO registration.
> >
> > I don't think a "diag" bus makes sense.
>
> You don't need a bus necessarily, just a parent class.
>
> > The individual diagnoses are
> > way too heterogenous beyond the fact that they use the same base
> > instruction.
> >
> > So where's the proper place for "misc" devices? My impression was that
> > they can go on the sysbus.
> >
>
> If you really don't want to create your own class, how about you inherit from
> the DeviceState class?
I tried that for the watchdog, and it certainly works, but some things
end up odd:
- in 'info qtree', the watchdog device does not show up at all
- in the list of devices printed by "-device help", diag288 is now the
only device without any bus
I would have thought that any device not attached to a specialized bus
should end up on the main system bus, which brings me back to adding it
as a sysbus device ;)
Does sysbus instead need to get more generic? The platform stuff seems
to be a better fit for MMIO, PIO et al.?
- Re: [Qemu-devel] [PATCH 3/6] s390/kvm: diag288 instruction interception and handling, (continued)
- [Qemu-devel] [PATCH 6/6] watchdog: Add new Virtual Watchdog action INJECT-NMI, Cornelia Huck, 2015/04/17
- [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Cornelia Huck, 2015/04/17
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Alexander Graf, 2015/04/21
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Cornelia Huck, 2015/04/22
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Alexander Graf, 2015/04/22
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Cornelia Huck, 2015/04/22
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Alexander Graf, 2015/04/22
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus,
Cornelia Huck <=
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Alexander Graf, 2015/04/27
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Cornelia Huck, 2015/04/27
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Andreas Färber, 2015/04/27
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Cornelia Huck, 2015/04/27
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Alexander Graf, 2015/04/27
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Cornelia Huck, 2015/04/27
- Re: [Qemu-devel] [PATCH 1/6] s390x/virtio-ccw: enable has_dynamic_sysbus, Markus Armbruster, 2015/04/28
[Qemu-devel] [PATCH 4/6] watchdog: Add migration support to diag288 watchdog device, Cornelia Huck, 2015/04/17
[Qemu-devel] [PATCH 2/6] watchdog: Add watchdog device diag288 to the sysbus, Cornelia Huck, 2015/04/17