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From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>,
	Markus Armbruster <armbru@redhat.com>
Cc: "Daniel P. Berrange" <berrange@redhat.com>,
	Eduardo Habkost <ehabkost@redhat.com>,
	Alistair Francis <alistair@alistair23.me>,
	QEMU Developers <qemu-devel@nongnu.org>,
	qemu-arm <qemu-arm@nongnu.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	KONRAD Frederic <fred.konrad@greensocs.com>
Subject: Re: [PATCH 02/24] display/xlnx_dp: Fix to realize "i2c-ddc" and "aux-to-i2c-bridge"
Date: Mon, 18 May 2020 13:13:05 +0200	[thread overview]
Message-ID: <8daeec76-0851-54a3-d84b-67a6019eef85@redhat.com> (raw)
In-Reply-To: <CAFEAcA-FKUHyG=bgJqPG49WZDXV8JGQqqZXOw49C8_h9mYS5iA@mail.gmail.com>

On 5/18/20 12:30 PM, Peter Maydell wrote:
> On Mon, 18 May 2020 at 06:04, Markus Armbruster <armbru@redhat.com> wrote:
>>
>> xlnx_dp_init() creates these two devices, but they're never realized.
>> Affects machine xlnx-zcu102.
>>
>> I wonder how this ever worked.  If the "device becomes real only on
>> realize" thing actually works, then we've always been missing these
>> two devices, yet nobody noticed.
> 
> It depends entirely on the implementation of the device.
> If it happens to do nothing in the realize method that
> matters (eg i2c-ddc has no realize method and does the limited
> amount of initialization it needs in instance_init) then the
> device will (by lucky accident) work just fine.
> 
> We should really ideally have an assert() in the DeviceClass
> reset that the device was realized, so we can keep this kind
> of bug out of the codebase. (Last time I looked it wasn't obvious
> exactly where to put the assert now that we have both legacy-reset
> and three-phase-reset, unfortunately.)

Your wish came true in the last patch of this series! #24:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg704239.html

> 
> thanks
> -- PMM
> 



  reply	other threads:[~2020-05-18 11:14 UTC|newest]

Thread overview: 104+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-18  5:03 [PATCH 00/24] Fixes around device realization Markus Armbruster
2020-05-18  5:03 ` [PATCH 01/24] arm/stm32f405: Fix realization of "stm32f2xx-adc" devices Markus Armbruster
2020-05-18 16:48   ` Alistair Francis
2020-05-19  5:08     ` Markus Armbruster
2020-05-19 22:20       ` Alistair Francis
2020-05-27  9:27         ` Markus Armbruster
2020-05-27 11:24           ` Philippe Mathieu-Daudé
2020-05-18  5:03 ` [PATCH 02/24] display/xlnx_dp: Fix to realize "i2c-ddc" and "aux-to-i2c-bridge" Markus Armbruster
2020-05-18  8:19   ` Fred Konrad
2020-05-19  5:09     ` Markus Armbruster
2020-05-19  9:48       ` Peter Maydell
2020-05-19 12:07         ` Markus Armbruster
2020-05-18  9:59   ` Edgar E. Iglesias
2020-05-18 10:30   ` Peter Maydell
2020-05-18 11:13     ` Philippe Mathieu-Daudé [this message]
2020-05-19  5:13       ` Markus Armbruster
2020-05-18 16:56   ` Alistair Francis
2020-05-18  5:03 ` [PATCH 03/24] sd/pxa2xx_mmci: Fix to realize "pxa2xx-mmci" device Markus Armbruster
2020-05-21 16:20   ` Peter Maydell
2020-05-18  5:03 ` [PATCH 04/24] aspeed: Don't create unwanted "ftgmac100", "aspeed-mmi" devices Markus Armbruster
2020-05-18 12:19   ` Cédric Le Goater
2020-05-19  0:20     ` Andrew Jeffery
2020-05-19  5:45       ` Markus Armbruster
2020-05-19 11:42         ` Philippe Mathieu-Daudé
2020-05-19 12:44           ` Cédric Le Goater
2020-05-19  0:38     ` Joel Stanley
2020-05-19  5:35       ` Markus Armbruster
2020-05-18  5:03 ` [PATCH 05/24] aspeed: Don't create unwanted "cortex-a7-arm-cpu" devices Markus Armbruster
2020-05-18 12:24   ` Cédric Le Goater
2020-05-19  0:40     ` Joel Stanley
2020-05-19  5:46       ` Markus Armbruster
2020-05-19  9:35         ` Cédric Le Goater
2020-05-18  5:03 ` [PATCH 06/24] armv7m: Bury unwanted "ARM,bitband-memory" devices Markus Armbruster
2020-05-21 16:17   ` Peter Maydell
2020-05-25  5:50     ` Markus Armbruster
2020-05-25 12:32       ` Paolo Bonzini
2020-05-25 12:49         ` Peter Maydell
2020-05-26  5:19           ` Markus Armbruster
2020-05-18  5:03 ` [PATCH 07/24] auxbus: Fix aux-to-i2c-bridge to be a subtype of aux-slave Markus Armbruster
2020-05-18  8:53   ` Philippe Mathieu-Daudé
2020-05-18  5:03 ` [PATCH 08/24] mac_via: Fix to realize "mos6522-q800-via*" devices Markus Armbruster
2020-05-18 20:25   ` Mark Cave-Ayland
2020-05-18  5:03 ` [PATCH 09/24] macio: Fix to realize "mos6522-cuda" and "mos6522-pmu" devices Markus Armbruster
2020-05-21 16:26   ` Peter Maydell
2020-05-25  6:25     ` Markus Armbruster
2020-05-27 14:12     ` Markus Armbruster
2020-05-27 15:05       ` Peter Maydell
2020-05-27 15:12         ` Paolo Bonzini
2020-05-28  6:57           ` Markus Armbruster
2020-05-27 16:08         ` Markus Armbruster
2020-05-18  5:03 ` [PATCH 10/24] macio: Bury unwanted "macio-gpio" devices Markus Armbruster
2020-05-18 20:35   ` Mark Cave-Ayland
2020-05-19  6:06     ` Markus Armbruster
2020-05-18  5:03 ` [PATCH 11/24] pnv/phb4: Bury unwanted "pnv-phb4-pec-stack" devices Markus Armbruster
2020-05-18  8:49   ` Greg Kurz
2020-05-18 13:24   ` Cédric Le Goater
2020-05-19  8:16   ` Cédric Le Goater
2020-05-19 11:50     ` Markus Armbruster
2020-05-18  5:03 ` [PATCH 12/24] MAINTAINERS: Make section PowerNV cover pci-host/pnv* as well Markus Armbruster
2020-05-18  6:41   ` David Gibson
2020-05-18  5:03 ` [PATCH 13/24] ppc4xx: Drop redundant device realization Markus Armbruster
2020-05-18  8:54   ` Philippe Mathieu-Daudé
2020-05-18 10:27   ` BALATON Zoltan
2020-05-19  6:07     ` Markus Armbruster
2020-05-18 16:41   ` Thomas Huth
2020-05-18  5:03 ` [PATCH 14/24] macio: Put "macio-nvram" device on the macio bus Markus Armbruster
2020-05-18 20:37   ` Mark Cave-Ayland
2020-05-18  5:03 ` [PATCH 15/24] macio: Fix macio-bus to be a subtype of System bus Markus Armbruster
2020-05-18  8:55   ` Philippe Mathieu-Daudé
2020-05-18 20:39   ` Mark Cave-Ayland
2020-05-19  6:09     ` Markus Armbruster
2020-05-18  5:04 ` [PATCH 16/24] ppc/pnv: Put "*-pnv-chip" and "pnv-xive" on the main system bus Markus Armbruster
2020-05-18 16:34   ` Cédric Le Goater
2020-05-19  6:28     ` Markus Armbruster
2020-05-19 13:05   ` Cédric Le Goater
2020-05-18  5:04 ` [PATCH 17/24] pnv/psi: Correct the pnv-psi* devices not to be sysbus devices Markus Armbruster
2020-05-18 16:27   ` Cédric Le Goater
2020-05-19  6:30     ` Markus Armbruster
2020-05-19 13:04   ` Cédric Le Goater
2020-05-18  5:04 ` [PATCH 18/24] display/sm501 display/ati: Fix to realize "i2c-ddc" Markus Armbruster
2020-05-18 10:32   ` BALATON Zoltan
2020-05-19  6:30     ` Markus Armbruster
2020-05-18 10:39   ` BALATON Zoltan
2020-05-18 10:45     ` Philippe Mathieu-Daudé
2020-05-19  6:35       ` Markus Armbruster
2020-05-18  5:04 ` [PATCH 19/24] riscv: Fix to put "riscv.hart_array" devices on sysbus Markus Armbruster
2020-05-18  5:04   ` Markus Armbruster
2020-05-18 17:03   ` Alistair Francis
2020-05-18 17:03     ` Alistair Francis
2020-05-18  5:04 ` [PATCH 20/24] riscv: Fix type of SiFive[EU]SocState, member parent_obj Markus Armbruster
2020-05-18  5:04   ` Markus Armbruster
2020-05-18  8:58   ` Philippe Mathieu-Daudé
2020-05-18  8:58     ` Philippe Mathieu-Daudé
2020-05-18 16:57   ` Alistair Francis
2020-05-18 16:57     ` Alistair Francis
2020-05-18  5:04 ` [PATCH 21/24] sparc/leon3: Fix to put grlib,* devices on sysbus Markus Armbruster
2020-05-18  8:09   ` Fred Konrad
2020-05-18  8:59   ` Philippe Mathieu-Daudé
2020-05-18  5:04 ` [PATCH 22/24] qdev: Assert devices are plugged into a bus that can take them Markus Armbruster
2020-05-18 15:03   ` Markus Armbruster
2020-05-18 20:42   ` Mark Cave-Ayland
2020-05-18  5:04 ` [PATCH 23/24] sd: Hide the qdev-but-not-quite thing created by sd_init() Markus Armbruster
2020-05-18  5:04 ` [PATCH 24/24] qdev: Assert onboard devices all get realized properly Markus Armbruster
2020-05-18  9:10   ` Philippe Mathieu-Daudé

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