linux-kernel - Re: [PATCH v4 09/11] x86/head64.c: Early update ucode in 64-bit

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Message-ID: <CAE9FiQUCqeWH2qezRMH=PY39tiy4MhSF1yy77QUBfdtPMr_hqQ@mail.gmail.com>
Date:	Thu, 20 Dec 2012 20:09:58 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Fenghua Yu <fenghua.yu@...el.com>
Cc:	H Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Asit K Mallick <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 v4 09/11] x86/head64.c: Early update ucode in 64-bit

On Thu, Dec 20, 2012 at 11:48 AM, Fenghua Yu <fenghua.yu@...el.com> wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
>
> This updates ucode on BSP in 64-bit mode. Paging and virtual address are
> working now.
>
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> ---
>  arch/x86/kernel/head64.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
> index e1cb611..1ccbaf1 100644
> --- a/arch/x86/kernel/head64.c
> +++ b/arch/x86/kernel/head64.c
> @@ -26,6 +26,7 @@
>  #include <asm/kdebug.h>
>  #include <asm/e820.h>
>  #include <asm/bios_ebda.h>
> +#include <asm/microcode.h>
>
>  /*
>   * Manage page tables very early on.
> @@ -179,6 +180,11 @@ 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));
> +
>         copy_bootdata(__va(real_mode_data));

can you make load_ucode_bsp take boot_param directly instead of
real_mode_data. ?

could be


        copy_bootdata(__va(real_mode_data));
+
+        /* Load microcode early on BSP. */
+       load_ucode_bsp(&boot_params);
+

because copy_bootdata, already copy boot_params...

Thanks

Yinghai
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