From: Paul Brook <paul@codesourcery.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: chrisw@redhat.com, kvm@vger.kernel.org,
Markus Armbruster <armbru@redhat.com>,
qemu-devel@nongnu.org, avi@redhat.com, kraxel@redhat.com
Subject: [Qemu-devel] Re: RFC qdev path semantics
Date: Thu, 17 Jun 2010 23:01:21 +0100 [thread overview]
Message-ID: <201006172301.22115.paul@codesourcery.com> (raw)
In-Reply-To: <1276811010.3216.25.camel@x201>
> > ### Paul proposes to require all buses to define bus addresses. Make
> > one up if necessary.
>
> That seems arbitrary and prone to breakage. How do we handle a subtle
> change in device instantiation order and still allow migration? If by
> code change or command line ordering my frobnitz moves from:
>
> /i440FX-pcihost/pci.0/PIIX3/@01.0/isa.0/0
>
> to
>
> /i440FX-pcihost/pci.0/PIIX3/@01.0/isa.0/1
Two things are apparent here.
(a) You've clearly misunderstood the proposals. The paths above make no sense.
(b) You've picked a particularly poor definition of device address for the ISA
bus. We can do much better than device creation order.
> ...
> I can live with PATH/@BUS-ADDR if it's still felt that
> PATH/IDENT@BUS-ADDR isn't canonical. What that means is that I'll
> probably code up vmstate and ramblocks to append IDENT themselves to
> keep all the goodness of having per PATH/IDENT namespaces.
As discussed elsewhere in this thread, addition of IDENT to the device path is
neither necessary nor sufficient for migration.
I really feel like we're going round in circles here.
Paul
next prev parent reply other threads:[~2010-06-17 22:01 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-14 5:51 [Qemu-devel] [RFC PATCH 0/5] Introduce canonical device hierarchy string Alex Williamson
2010-06-14 5:51 ` [Qemu-devel] [RFC PATCH 1/5] qdev: Create qdev_get_dev_path() Alex Williamson
2010-06-14 6:39 ` Markus Armbruster
2010-06-14 12:52 ` Alex Williamson
2010-06-14 13:00 ` Jan Kiszka
2010-06-14 13:09 ` Paul Brook
2010-06-14 15:29 ` Alex Williamson
2010-06-14 15:42 ` Paul Brook
2010-06-14 16:00 ` Jan Kiszka
2010-06-14 16:38 ` Alex Williamson
2010-06-14 16:49 ` Jan Kiszka
2010-06-14 18:35 ` Alex Williamson
2010-06-14 21:43 ` Paul Brook
2010-06-14 22:11 ` Alex Williamson
2010-06-14 22:46 ` Paul Brook
2010-06-15 1:14 ` Alex Williamson
2010-06-15 11:24 ` Paul Brook
2010-06-15 8:47 ` Markus Armbruster
2010-06-15 9:34 ` Jan Kiszka
2010-06-15 11:28 ` Paul Brook
2010-06-15 11:45 ` Jan Kiszka
2010-06-15 12:04 ` Paul Brook
2010-06-15 12:16 ` Jan Kiszka
2010-06-15 12:39 ` Paul Brook
2010-06-15 13:00 ` Jan Kiszka
2010-06-15 13:14 ` Paul Brook
2010-06-15 13:16 ` Markus Armbruster
2010-06-15 13:32 ` Jan Kiszka
2010-06-15 20:53 ` Alex Williamson
2010-06-15 21:55 ` Paul Brook
2010-06-15 22:33 ` Alex Williamson
2010-06-15 23:01 ` Paul Brook
2010-06-15 23:10 ` Alex Williamson
2010-06-16 0:25 ` Chris Wright
2010-06-16 0:30 ` Paul Brook
2010-06-16 0:35 ` Chris Wright
2010-06-16 1:30 ` Paul Brook
2010-06-16 2:55 ` Alex Williamson
2010-06-16 8:23 ` Markus Armbruster
2010-06-17 22:25 ` Alex Williamson
2010-06-18 9:16 ` Jan Kiszka
2010-06-18 15:01 ` Alex Williamson
2010-06-18 15:22 ` Jan Kiszka
2010-06-18 14:03 ` Markus Armbruster
2010-06-18 14:14 ` Jan Kiszka
2010-06-18 15:21 ` Alex Williamson
2010-06-15 11:42 ` Markus Armbruster
2010-06-15 11:59 ` Jan Kiszka
2010-06-15 13:07 ` Markus Armbruster
2010-06-15 13:19 ` Paul Brook
2010-06-15 13:32 ` Paul Brook
2010-06-15 15:08 ` Jan Kiszka
2010-06-16 13:02 ` Markus Armbruster
2010-06-14 5:51 ` [Qemu-devel] [RFC PATCH 2/5] savevm: Add DeviceState param Alex Williamson
2010-06-14 5:51 ` [Qemu-devel] [RFC PATCH 3/5] savevm: Make use of the new " Alex Williamson
2010-06-14 5:51 ` [Qemu-devel] [RFC PATCH 4/5] eepro100: Add a dev field to eeprom new/free functions Alex Williamson
2010-06-14 5:51 ` [Qemu-devel] [RFC PATCH 5/5] virtio-net: Incorporate a DeviceState pointer and let savevm track instances Alex Williamson
2010-06-14 7:02 ` [Qemu-devel] Re: [RFC PATCH 0/5] Introduce canonical device hierarchy string Gerd Hoffmann
2010-06-14 19:56 ` Alex Williamson
2010-06-15 8:53 ` Markus Armbruster
2010-06-15 18:01 ` Alex Williamson
2010-06-16 8:34 ` Markus Armbruster
2010-06-16 8:36 ` Markus Armbruster
2010-06-15 9:12 ` Gerd Hoffmann
2010-06-15 18:03 ` Alex Williamson
2010-06-16 9:46 ` RFC qdev path semantics (was: [Qemu-devel] [RFC PATCH 0/5] Introduce canonical device hierarchy string) Markus Armbruster
2010-06-16 10:40 ` Paul Brook
2010-06-16 11:37 ` [Qemu-devel] Re: RFC qdev path semantics Jan Kiszka
2010-06-16 11:45 ` Paul Brook
2010-06-16 12:01 ` Jan Kiszka
2010-06-16 12:21 ` Paul Brook
2010-06-16 13:50 ` Jan Kiszka
2010-06-16 13:05 ` Markus Armbruster
2010-06-16 13:23 ` Paul Brook
2010-06-16 14:31 ` Markus Armbruster
2010-06-17 21:43 ` Alex Williamson
2010-06-17 22:01 ` Paul Brook [this message]
2010-06-17 22:34 ` Alex Williamson
2010-06-18 7:52 ` Gerd Hoffmann
2010-06-18 14:58 ` Markus Armbruster
2010-06-22 14:27 ` Anthony Liguori
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