Re: [PATCH v12] acpi, apei, arm64: APEI initial support for aarch64.

[Borislav Petkov]

On Fri, Jul 29, 2016 at 04:57:44PM +0800, fu.wei@xxxxxxxxxx wrote:
> From: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
> 
> This commit provides APEI arch-specific bits for aarch64
> 
> Meanwhile,
> (1)add a new subfunction "hest_ia32_init" for
> "acpi_disable_cmcff" which is used by IA-32 Architecture
> Corrected Machine Check (CMC).
> (2)move HEST type (ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) checking to
> a generic place.
> (3)select HAVE_ACPI_APEI when EFI and ACPI is set on ARM64,
> because arch_apei_get_mem_attribute is using efi_mem_attributes on ARM64.
> 
> [Fu Wei: improve && upstream]
> 
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
> Tested-by: Jonathan (Zhixiong) Zhang <zjzhang@xxxxxxxxxxxxxx>
> Signed-off-by: Fu Wei <fu.wei@xxxxxxxxxx>
> Acked-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> Tested-by: Tyler Baicar <tbaicar@xxxxxxxxxxxxxx>
> Acked-by: Will Deacon <will.deacon@xxxxxxx>
> ---

...

> @@ -110,8 +111,21 @@ static inline const char *acpi_get_enable_method(int cpu)
>  }
>  
>  #ifdef	CONFIG_ACPI_APEI
> +#define acpi_disable_cmcff 1

What does that mean? ARM doesn't have firmware-first mode?

A piece of comment please.

>  pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr);
> -#endif
> +
> +/*
> + * Despite its name, this function must still broadcast the TLB
> + * invalidation in order to ensure other CPUs don't up with junk
						      ^
						     end

> + * entries as a result of speculation. Unusually, its also called in
> + * IRQ context (ghes_iounmap_irq) so if we ever need to use IPIs for
> + * TLB broadcasting, then we're in trouble here.
> + */
> +static inline void arch_apei_flush_tlb_one(unsigned long addr)
> +{
> +	flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
> +}
> +#endif /* CONFIG_ACPI_APEI */
>  
>  #ifdef CONFIG_ACPI_NUMA
>  int arm64_acpi_numa_init(void);
> diff --git a/arch/x86/kernel/acpi/apei.c b/arch/x86/kernel/acpi/apei.c
> index c280df6..ea3046e 100644
> --- a/arch/x86/kernel/acpi/apei.c
> +++ b/arch/x86/kernel/acpi/apei.c

...

> diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
> index 20b3fcf..792a0d9 100644
> --- a/drivers/acpi/apei/hest.c
> +++ b/drivers/acpi/apei/hest.c
> @@ -232,8 +243,9 @@ void __init acpi_hest_init(void)
>  		goto err;
>  	}
>  
> -	if (!acpi_disable_cmcff)
> -		apei_hest_parse(hest_parse_cmc, NULL);
> +	rc = hest_ia32_init();

Why do you need a separate hest_ia32_init() here?

You can do

	rc = apei_hest_parse(hest_parse_cmc, NULL);

directly here AFAICT.

> +	if (rc)
> +		goto err;
>  
>  	if (!ghes_disable) {
>  		rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
> -- 
> 2.5.5
> 

-- 
Regards/Gruss,
    Boris.

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