linux-kernel - Re: [PATCH] x86/mce/AMD: Don't set DEF_INT_TYPE in MSR_CU_DEF

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Message-ID: <20171127103619.h5dddkdbps4aysat@pd.tnic>
Date:   Mon, 27 Nov 2017 11:36:19 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Yazen Ghannam <Yazen.Ghannam@....com>
Cc:     linux-edac@...r.kernel.org, Borislav Petkov <bp@...e.de>,
        Tony Luck <tony.luck@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/mce/AMD: Don't set DEF_INT_TYPE in MSR_CU_DEF_ERR on
 SMCA systems

On Mon, Nov 20, 2017 at 10:26:46AM -0600, Yazen Ghannam wrote:
> From: Yazen Ghannam <yazen.ghannam@....com>
> 
> The McaIntrCfg register at MSRC000_0410, previously known as CU_DEFER_ERR,
> is used on SMCA systems to set the LVT offset for the Threshold and
> Deferred error interrupts.
> 
> This register was used on non-SMCA systems to also set the Deferred
> interrupt type in bits 2:1. However, these bits are reserved on SMCA
> systems.
> 
> Only set MSRC000_0410[2:1] on non-SMCA systems.
> 
> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> ---
>  arch/x86/kernel/cpu/mcheck/mce_amd.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
> index e4e27adedc81..32008a8d293f 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
> @@ -418,7 +418,9 @@ static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
>  	    (deferred_error_int_vector != amd_deferred_error_interrupt))
>  		deferred_error_int_vector = amd_deferred_error_interrupt;
>  
> -	low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC;
> +	if (!mce_flags.smca)
> +		low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC;
> +
>  	wrmsr(MSR_CU_DEF_ERR, low, high);
>  }
>  
> -- 

Applied, thanks.

-- 
Regards/Gruss,
    Boris.

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