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

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Date:	Sat, 8 Aug 2015 10:39:22 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Matt Fleming <matt@...eblueprint.co.uk>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"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()


* Matt Fleming <matt@...eblueprint.co.uk> wrote:

> 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

Ok, I applied the patches up to this point, to tip:core/efi, to get the ball 
rolling - and will push them out after testing:

 8d446c8647c9 arm64/mm: Add PROT_DEVICE_nGnRnE and PROT_NORMAL_WT
 b40227fbfb1f acpi, x86: Implement arch_apei_get_mem_attributes()
 7bf793115dd9 efi, x86: Rearrange efi_mem_attributes()
 fa5c35011a8d Revert "x86/efi: Request desired alignment via the PE/COFF headers"
 248fbcd5aee0 x86/efi-bgrt: Switch pr_err() to pr_debug() for invalid BGRT
 87db73aebf55 efi: Add support for EFI_MEMORY_RO attribute introduced by UEFIv2.5

Let me know when the concerns are resolved or there are other patches to add.

Thanks,

	Ingo
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