linux-kernel - Re: [PATCH 7/8] arm64: apei: implement arch_apei_get_mem

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Message-ID: <20150807095009.GC2625@codeblueprint.co.uk>
Date:	Fri, 7 Aug 2015 10:50:09 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>,
	Matt Fleming <matt.fleming@...el.com>,
	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH 7/8] arm64: apei: implement arch_apei_get_mem_attributes()

On Fri, 07 Aug, at 09:37:00AM, Matt Fleming wrote:
> From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
> 
> Table 8 of UEFI 2.5 section 2.3.6.1 defines mappings from EFI
> memory types to MAIR attribute encodings for arm64.
> 
> If the physical address has memory attributes defined by EFI
> memmap as EFI_MEMORY_[UC|WC|WT], return approprate page protection
> type according to the UEFI spec. Otherwise, return PAGE_KERNEL.
> 
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> Acked-by: Hanjun Guo <hanjun.guo@...aro.org>
> Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org>
> Signed-off-by: Matt Fleming <matt.fleming@...el.com>
> ---
>  arch/arm64/include/asm/acpi.h | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 

Ard Biesheuvel has brought up a concern with this patch and it's
currently under discussion here,

  https://lkml.kernel.org/r/CAKv+Gu8+g3dTaNzXjSD=5GxproaHM+Eu1hLmRWp7cVrQimzbHQ@mail.gmail.com

-- 
Matt Fleming, Intel Open Source Technology Center
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