linux-kernel - Re: [Xen-devel] [PATCH] xen: remove unused Kconfig parameter

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Date:	Thu, 11 Jul 2013 20:13:58 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Borislav Petkov <bp@...en8.de>, Matt Wilson <msw@...zon.com>,
	Michael Opdenacker <michael.opdenacker@...e-electrons.com>,
	jeremy@...p.org, xen-devel@...ts.xensource.com, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, mingo@...hat.com,
	tglx@...utronix.de
Subject: Re: [Xen-devel] [PATCH] xen: remove unused Kconfig parameter

On Thu, 2013-07-11 at 10:57 -0700, H. Peter Anvin wrote:
> On 07/11/2013 03:08 AM, Paul Bolle wrote:
> > But the Kconfig entry for XEN_PRIVILEGED_GUEST reads: 
> >     # Dummy symbol since people have come to rely on the PRIVILEGED_GUEST
> >     # name in tools.
> >     config XEN_PRIVILEGED_GUEST
> >             def_bool XEN_DOM0
> > 
> > In other words: CONFIG_XEN_PRIVILEGED_GUEST should always be equal to
> > CONFIG_XEN_DOM0. So the two grep commands should always both evaluate to
> > true or both evaluate to false. One of these two commands can safely be
> > dropped.
> 
> Not necessarily true across kernel versions.

Correct. But it has actually been true ever since this Kconfig entry was
introduced in v2.6.37 (commit 6b0661a5e6fbfb159b78a39c0476905aa9b575fe,
"xen: introduce XEN_DOM0 as a silent option").

So people need not worry about breaking grub2 by dropping
XEN_PRIVILEGED_GUEST.


Paul Bolle

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