Re: [Qemu-devel] [PATCH] Add nvram to default boot device list

[David Gibson <dwg@au1.ibm.com>]

On Fri, Oct 12, 2012 at 02:03:00AM +0200, Alexander Graf wrote:
> 
> On 12.10.2012, at 00:59, David Gibson wrote:
> 
> > On Thu, Oct 11, 2012 at 07:34:42AM +0530, Avik Sil wrote:
> >> This patch adds nvram specified boot device into qemu default
> >> boot_devices list. This helps firmware to boot from nvram specified
> >> boot device if no -boot option is specified.
> > 
> > I really don't think this is a good idea, it extends an already
> > deprecated mechanism in a fuzzy way and requires careful checking to
> > see if it could break anything.  On all platforms the boot sequence
> > should be:
> > 	if bootindex is specified:
> > 		boot according to bootindex
> > 	else if -boot is specified:
> > 		boot according to -boot sequence
> > 	else:
> > 		use platform firmware default sequence
> > 
> > The last will of course vary by platform, and could depend on platform
> > details like the contents of NVRAM.  Your original idea of making it
> > clear to the guest when -boot has been specified (as opposed to when
> > it contains its default value) was the right one, and this "x" in
> > -boot is going the wrong direction.
> 
> Given that this is a fundamental direction for a bunch of machines,
> how about we talk about it on the weekly QEMU call?

Uh, is this a call I know about?

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson