linux-kernel - Re: [PATCH] xen: remove XEN_PRIVILEGED

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Message-ID: <20140217144307.GB28658@localhost.localdomain>
Date:	Mon, 17 Feb 2014 09:43:08 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	Richard Weinberger <richard@....at>,
	Michael Opdenacker <michael.opdenacker@...e-electrons.com>,
	Ingo Molnar <mingo@...hat.com>, xen-devel@...ts.xenproject.org,
	"H. Peter Anvin" <hpa@...or.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen: remove XEN_PRIVILEGED_GUEST

On Mon, Feb 17, 2014 at 02:03:17PM +0100, Paul Bolle wrote:
> On Mon, 2014-02-17 at 07:23 -0500, Konrad Rzeszutek Wilk wrote:
> > On Feb 16, 2014 3:07 PM, Paul Bolle <pebolle@...cali.nl> wrote:
> > Please look in the grub git tree. They have fixed their code to not do
> > this anymore. This should be reflected in the patch description.
> 
> Thanks, I didn't know that. That turned out to be grub commit
> ec824e0f2a399ce2ab3a2e3353d372a236595059 ("Implement grub_file tool and
> use it to implement generating of config"), see
> http://git.savannah.gnu.org/cgit/grub.git/commit/util/grub.d/20_linux_xen.in?id=ec824e0f2a399ce2ab3a2e3353d372a236595059
> 
> > Lastly please check which distro has this new grub version so that we
> > know which distros won't be affected.
> 
> No distro should be affected. See, the test that grub2 used to do was
> (edited for clarity):
>     grep -qx "CONFIG_XEN_DOM0=y" "${config}" || grep -qx "CONFIG_XEN_PRIVILEGED_GUEST=y" "${config}"
> 
> But the Kconfig entry for XEN_PRIVILEGED_GUEST reads:
>     config XEN_PRIVILEGED_GUEST
>             def_bool XEN_DOM0
> 
> Ie, XEN_PRIVILEGED_GUEST is equal to XEN_DOM0 by definition, so the
> second part of that test is superfluous. (We discussed this last year.
> If lkml.org weren't down I'd provide a link.) Or am I misreading this
> Kconfig entry?

Ah, forgot about the second test for 'XEN_DOM0'. Yes that should work.

Thanks!
> 
> I hope to send a v2, with an updated commit explanation, in a few days.
> 
> 
> Paul Bolle
> 
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