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Date: Tue, 6 Aug 2013 15:08:09 +0300
From: Gleb Natapov <gleb@redhat.com>
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Subject: Re: [Qemu-devel] [SeaBIOS] [PATCH] don't expose pvpanic device in
	the UI
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Marcel Apfelbaum <marcel.a@redhat.com>, seabios@seabios.org, qemu-devel@nongnu.org, "Michael S. Tsirkin" <mst@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Andreas =?utf-8?Q?F=C3=A4rber?= <afaerber@suse.de>

On Tue, Aug 06, 2013 at 01:54:17PM +0200, Gerd Hoffmann wrote:
>   Hi,
> 
> > And what are the rules that govern device exclusion from -nodefaults
> > list? Why -nodefaults does not create empty machine?
> 
> "qemu -nodefaults" should give you just cpu + northbridge + southbridge.
> 
On modern machine this is everything that most will ever have.

> "qemu" should give you a usable virtual machine, so qemu adds some
> optional devices which are (or used to be) standard in a pc: floppy,
> cdrom, serial port, parallel port, vga card, nic.
> 
> Sometimes things are a bit odd for historical reasons:
> 
> USB controllers are only present in case you ask for them via '-usb' or
> add them via '-device', even though they are part of the southbridge.
> 
> vmport is there unconditionally.  And I'd rather make that one
> configurable instead of adding more hard-coded devices.
> 
There are more, as I already said hotplug device (I am to lazy to search
for more, so I always bring this one).

--
			Gleb.