linux-kernel - Re: [PATCH 3/3] xen/microcode: partially enable even for non-privileged kernels

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Date:	Mon, 15 Nov 2010 11:02:45 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 3/3] xen/microcode: partially enable even for
 non-privileged kernels

On Thu, Nov 11, 2010 at 03:58:06PM -0800, Jeremy Fitzhardinge wrote:
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> Don't attempt to load microcode on non-privileged kernels.  Kernels

The previous patch had this:

 if (!xen_initial_domain())
+               return NULL;

which pretty much made non-priviliged kernels not do any micro code loading.

It sounds like this patch is just to not compile the Xen microcode code
if CONFIG_DOM0 is not enabled?

> compiled without privileged support just get vestigial Xen detection
> to skip loading altogether; kernels with privileged support will
> load microcode if running privileged.  In either case, the normal
> Intel/AMD microcode loader is skipped under Xen.
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