linux-kernel - Re: [PATCH v2 2/4] efi/arm: map UEFI memory map even w/o runtime services enabled

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Message-ID: <d910258e-b332-36f3-4024-ed9ab48af278@arm.com>
Date:   Thu, 28 Jun 2018 18:29:17 +0100
From:   James Morse <james.morse@....com>
To:     AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:     catalin.marinas@....com, will.deacon@....com,
        akpm@...ux-foundation.org, ard.biesheuvel@...aro.org,
        tbaicar@...eaurora.org, bhsharma@...hat.com, dyoung@...hat.com,
        mark.rutland@....com, al.stone@...aro.org,
        graeme.gregory@...aro.org, hanjun.guo@...aro.org,
        lorenzo.pieralisi@....com, sudeep.holla@....com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org
Subject: Re: [PATCH v2 2/4] efi/arm: map UEFI memory map even w/o runtime
 services enabled

Hi Akashi,

On 19/06/18 07:44, AKASHI Takahiro wrote:
> Under the current implementation, UEFI memory map will be mapped and made
> available in virtual mappings only if runtime services are enabled.

> But in a later patch, we want to use UEFI memory map in acpi_os_ioremap()
> to create mappings of ACPI tables using memory attributes described in
> UEFI memory map.
> 
> So, as a first step, arm_enter_runtime_services() will be modified
> so that UEFI memory map will be always accessible.
> 
> See a relevant commit:
>     arm64: acpi: fix alignment fault in accessing ACPI tables

For what its worth:
Acked-by: James Morse <james.morse@....com>


Thanks,

James