linux-kernel - Re: [PATCH] x86: correct saving and restoring of lapic vectors in suspend/resume

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Message-ID: <20151123111346.GA5400@pd.tnic>
Date:	Mon, 23 Nov 2015 12:13:46 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Juergen Gross <jgross@...e.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
	tglx@...utronix.de, mingo@...hat.com,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH] x86: correct saving and restoring of lapic vectors in
 suspend/resume

On Mon, Nov 23, 2015 at 11:59:24AM +0100, Juergen Gross wrote:
> Saving and restoring lapic vectors in lapic_suspend() and
> lapic_resume() is not consistent: the thmr vector saving is guarded
> by a different config option than the restore part. The cmci vector
> isn't handled at all.
> 
> Those inconsistencies are not very critical, as the missing cmci
> vector will be set via mce resume handling, the wrong config option
> used for restoring the thmr vector can't be configured differently
> than the one which should be used.
> 
> Nevertheless correct the thmr vector restore and add cmci vector
> handling.
> 
> Signed-off-by: Juergen Gross <jgross@...e.com>
> ---
>  arch/x86/kernel/apic/apic.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)

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

Add Tony to CC and leave in the rest for him to look at:

> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
> index 2f69e3b..bc06c9d 100644
> --- a/arch/x86/kernel/apic/apic.c
> +++ b/arch/x86/kernel/apic/apic.c
> @@ -2270,6 +2270,7 @@ static struct {
>  	unsigned int apic_tmict;
>  	unsigned int apic_tdcr;
>  	unsigned int apic_thmr;
> +	unsigned int apic_cmci;
>  } apic_pm_state;
>  
>  static int lapic_suspend(void)
> @@ -2299,6 +2300,10 @@ static int lapic_suspend(void)
>  	if (maxlvt >= 5)
>  		apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
>  #endif
> +#ifdef CONFIG_X86_MCE_INTEL
> +	if (maxlvt >= 6)
> +		apic_pm_state.apic_cmci = apic_read(APIC_LVTCMCI);
> +#endif
>  
>  	local_irq_save(flags);
>  	disable_local_APIC();
> @@ -2355,10 +2360,14 @@ static void lapic_resume(void)
>  	apic_write(APIC_SPIV, apic_pm_state.apic_spiv);
>  	apic_write(APIC_LVT0, apic_pm_state.apic_lvt0);
>  	apic_write(APIC_LVT1, apic_pm_state.apic_lvt1);
> -#if defined(CONFIG_X86_MCE_INTEL)
> +#if defined(CONFIG_X86_THERMAL_VECTOR)
>  	if (maxlvt >= 5)
>  		apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr);
>  #endif
> +#if defined(CONFIG_X86_MCE_INTEL)
> +	if (maxlvt >= 6)
> +		apic_write(APIC_LVTCMCI, apic_pm_state.apic_cmci);
> +#endif
>  	if (maxlvt >= 4)
>  		apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc);
>  	apic_write(APIC_LVTT, apic_pm_state.apic_lvtt);
> -- 
> 2.6.2
> 
> --
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-- 
Regards/Gruss,
    Boris.

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