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Re: [Qemu-ppc] [PATCH] vga: make stdvga the global default

From: Gerd Hoffmann
Subject: Re: [Qemu-ppc] [PATCH] vga: make stdvga the global default
Date: Fri, 6 Jul 2018 09:14:09 +0200
User-agent: NeoMutt/20180622

On Thu, Jul 05, 2018 at 05:24:09PM +0100, Mark Cave-Ayland wrote:
> On 05/07/18 14:12, Eduardo Habkost wrote:
> > > I also checked the code, default values are used also for other fields in
> > > that struct (e.g., default_cpus). If default values are considered 
> > > fragile,
> > > they must be changed as well in the middle term. However, given a solid
> > > documentation (which is currently missing for these fields) I still think
> > > that default values are acceptable.
> > > 
> > > Note that there seems also be the possibility to set != NULL default 
> > > values
> > > in the machine_class_init() function.
> > 
> > I don't mind if the default value is defined at
> > machine_class_init() or main().  What bothers me is a default
> > value that depends on vga_interface_available(), because it can
> > be easily broken by a build config change (as demonstrated by the
> > bug fixed by this patch).
> I've already sent David a for-3.0 patch to set stdvga for the PPC Mac
> machines, but should I also do the same for PReP too?

Makes sense, yes.

> Is it also worth explicitly adding this for sun4u? And what about
> non-ISA/PCI cards such as sun4m's TCX/CG3?

Hmm, sparc has its own mechanism to use tcx as default (IIRC you get tcx
unless -vga cg3 is specified).  Should be possible to switch this over
to use the MachineClass field instead.


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