linux-kernel - Re: [PATCH V9 0/5] map GHES memory region according to EFI memory map

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Date:	Mon, 3 Aug 2015 12:26:58 +0100
From:	Will Deacon <will.deacon@....com>
To:	"Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"tony.luck@...il.com" <tony.luck@...il.com>,
	"ard.biesheuvel@...aro.org" <ard.biesheuvel@...aro.org>,
	"fu.wei@...aro.org" <fu.wei@...aro.org>,
	"al.stone@...aro.org" <al.stone@...aro.org>,
	"bp@...en8.de" <bp@...en8.de>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"ying.huang@...el.com" <ying.huang@...el.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"leif.lindholm@...aro.org" <leif.lindholm@...aro.org>,
	"hanjun.guo@...aro.org" <hanjun.guo@...aro.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	"vgandhi@...eaurora.org" <vgandhi@...eaurora.org>,
	"timur@...eaurora.org" <timur@...eaurora.org>
Subject: Re: [PATCH V9 0/5] map GHES memory region according to EFI memory map

Hi Jonathan,

On Thu, Jul 30, 2015 at 10:35:04PM +0100, Jonathan (Zhixiong) Zhang wrote:
> From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>
> 
> On a platform with APEI (ACPI Platform Error Interface) enabled, firmware
> updates a memory region with hardware error record using nocache
> attribute. When OS reads the region, since it maps the region with
> cacahed attribute even though EFI memory map defines this region as
> uncached, OS gets stale data and errorneously reports there is no new
> HW error.
> 
> When ghes driver maps the memory region, it uses the cache attribute
> according to EFI memory map, if EFI memory map feature is enabled
> at runtime.
> 
> Since both arch/x86 and arch/ia64 implemented architecture agnostic EFI
> memory map attribue lookup function efi_memattributes(), the code is
> moved from arch/x86 into EFI subsystem and is declared as __weak; archs
> other than ia64 should not override the default implementation.
> 
> V9:
> 1. Rebased to arm64-upstream-14543 of arm64/master.
> 2. Match strict MM type in arch_apei_get_mem_attribute().

I guess this is all going via Matt's tree? I'm happy to take the new
memory type in arch/arm64/ if there's nothing currently queued, but I
suspect it makes more sense for it to stay together.

Will
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