linux-kernel - RE: [PATCH v3 08/10] x86/head64.c: Early update ucode in 64-bit

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Message-ID: <3E5A0FA7E9CA944F9D5414FEC6C71220470F89E7@ORSMSX105.amr.corp.intel.com>
Date:	Tue, 18 Dec 2012 22:55:46 +0000
From:	"Yu, Fenghua" <fenghua.yu@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	Tigran Aivazian <tigran@...azian.fsnet.co.uk>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>,
	linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: RE: [PATCH v3 08/10] x86/head64.c: Early update ucode in 64-bit

> From: yhlu.kernel@...il.com [mailto:yhlu.kernel@...il.com] On Behalf Of
> Yinghai Lu
> On Mon, Dec 17, 2012 at 3:30 PM, Yu, Fenghua <fenghua.yu@...el.com>
> wrote:
> >
> > OSV may need the patchset based on old kernel. So I'll have the
> patchset ready. Is this the right place to call load_ucode_bsp() in the
> upstream kernel?
> >
> > diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
> > index a512f56..e94b90e 100644
> > --- a/arch/x86/kernel/head64.c
> > +++ b/arch/x86/kernel/head64.c
> > @@ -93,6 +88,11 @@ void __init x86_64_start_kernel(char *
> real_mode_data)
> >         }
> >         load_idt((const struct desc_ptr *)&idt_descr);
> >
> > +       /*
> > +        * Load microcode early on BSP.
> > +        */
> > +       load_ucode_bsp(__va(real_mode_data));
> > +
> >         if (console_loglevel == 10)
> >                 early_printk("Kernel alive\n");
> >
> it has to be after #PF handler set page table patch...
> 
> otherwise when ramdisk is above 1G, customer will get early PF
> exception.

If based on your for_x86_boot tree, is load_ucode_bsp() called afer load_idt()?

Thanks.

-Fenghua
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