linux-kernel - Re: [PATCH 2/6] arm/efi: Allow invocation of arbitrary runtime services [ver #2]

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Date:   Wed, 23 Nov 2016 11:46:38 +0000
From:   David Howells <dhowells@...hat.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     dhowells@...hat.com, lukas@...ner.de, linux-efi@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] arm/efi: Allow invocation of arbitrary runtime services [ver #2]

Mark Rutland <mark.rutland@....com> wrote:

> Any reason to not Cc LAKML?

Probably not.

> On Wed, Nov 23, 2016 at 12:22:43AM +0000, David Howells wrote:
> > Provide the ability to perform mixed-mode runtime service calls for arm in
> > the same way that commit 0a637ee61247bd4bed9b2a07568ef7a1cfc76187
> > ("x86/efi: Allow invocation of arbitrary boot services") provides the
> > ability to invoke arbitrary boot services.
> 
> I'm not sure I understand. On arm/arm64, "mixed-mode" simply isn't possible.
> 
> I see we already call runtime services directly in efi_get_secureboot()
> in drivers/firmware/efi/libstub/arm-stub.c.
> 
> If this is just to provide a consistent API for the stub, please note
> that.

How about:

    arm/efi: Allow invocation of arbitrary runtime services
    
    efi_call_runtime() is provided for x86 to be able abstract mixed mode
    support.  Provide this for ARM also so that common code work in mixed mode
    also.

David