linux-kernel - Re: [PATCH] x86/microcode/AMD: Add support for fam17h microcode loading

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Date:   Thu, 30 Nov 2017 23:52:00 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86/microcode/AMD: Add support for fam17h microcode
 loading

On Thu, Nov 30, 2017 at 04:46:40PM -0600, Tom Lendacky wrote:
> The size for the Microcode Patch Block (MPB) for an AMD family 17h
> processor is 3200 bytes.  Add a #define for fam17h so that it does
> not default to 2048 bytes and fail a microcode load/update.
> 
> Cc: <stable@...r.kernel.org> # 4.1.x
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> ---
>  arch/x86/kernel/cpu/microcode/amd.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
> index c6daec4..330b846 100644
> --- a/arch/x86/kernel/cpu/microcode/amd.c
> +++ b/arch/x86/kernel/cpu/microcode/amd.c
> @@ -470,6 +470,7 @@ static unsigned int verify_patch_size(u8 family, u32 patch_size,
>  #define F14H_MPB_MAX_SIZE 1824
>  #define F15H_MPB_MAX_SIZE 4096
>  #define F16H_MPB_MAX_SIZE 3458
> +#define F17H_MPB_MAX_SIZE 3200
>  
>  	switch (family) {
>  	case 0x14:
> @@ -481,6 +482,9 @@ static unsigned int verify_patch_size(u8 family, u32 patch_size,
>  	case 0x16:
>  		max_size = F16H_MPB_MAX_SIZE;
>  		break;
> +	case 0x17:
> +		max_size = F17H_MPB_MAX_SIZE;
> +		break;
>  	default:
>  		max_size = F1XH_MPB_MAX_SIZE;
>  		break;

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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