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

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Date:	Mon, 17 Dec 2012 15:34:09 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>
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

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.
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