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Re: [Qemu-block] [Qemu-devel] [PATCH RFC for-2.3? 0/8] prep: Fix pc87312

From: Andreas Färber
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH RFC for-2.3? 0/8] prep: Fix pc87312 for -device usage
Date: Mon, 30 Mar 2015 18:18:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

Am 30.03.2015 um 18:12 schrieb Paolo Bonzini:
> On 30/03/2015 16:25, Markus Armbruster wrote:
>> Andreas Färber <address@hidden> writes:
>>> Hello Markus et al.,
>>> This series attempts to fix the -device pc87312 issues you reported.
>>> I can't add alias properties for devices that don't get created before 
>>> realize.
>>> Therefore this involves moving code for various ISA devices, to enable us
>>> to initialize the objects early for alias properties and realizing them
>>> as part of the composite device once the configuration is known, also fixing
>>> error propagation while at it. Probably needs a further iteration.
>>> Yes, it's terribly invasive, that's why the code was as it is.
>>> But the code movements are quite trivial, as long as no in-air conflicts 
>>> occur.
>> Pity we have to move the state structs to the header, but that what we
>> have to do to make them embeddable.  And I understand embedding is how
>> we do sub-devices ("part of" instead of "plugged into").
>> Your changes are quite regular.  They don't look scary to me, but that
>> could be just ignorance.  They're non-trivial enough though to make wary
>> of merging them for 2.3 this late.
> The question is really: what is gained from this series as of 2.3?  Is
> anything actually using "-device pc87312"?  It was broken before IIUC,
> so it can remain broken for one more version.  Markus's patches would
> just add one more "git revert" to this series, basically.

Well, my intent was to avoid adding FIXMEs by fixing it properly right
away. But I don't see an urgent need as long as it's start-up errors and
not a device_add-induced crash (not sure here, would need to re-read
Markus' thread). Agree that it's getting late.


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