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Re: [Qemu-devel] [PATCH 1/2] Make pointer to fw_cfg device global.

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH 1/2] Make pointer to fw_cfg device global.
Date: Wed, 23 May 2012 16:41:33 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120421 Thunderbird/12.0

Am 23.05.2012 14:44, schrieb Peter Maydell:
> On 20 May 2012 10:02, Gleb Natapov <address@hidden> wrote:
>> There can be only one fw_cfg device, so saving global reference to it
>> removes the need to pass its pointer around.
> This seems like a backwards step to me: one of the things that prevents
> us supporting "two separate machines in one emulation" is that we have
> various things that assume there's only one instance of themselves and
> use globals. I don't think we should be adding any more...

While I concur with the design sentiment of avoiding globals where
possible, I can understand having multiple CPU types in one machine, but
multiple machines in one emulation? Do you have a specific example that
cannot easily be modeled as multiple socket-connected executables?


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