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

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Message-ID: <20161123133855.GG24624@leverpostej>
Date:   Wed, 23 Nov 2016 13:38:55 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     David Howells <dhowells@...hat.com>
Cc:     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]

On Wed, Nov 23, 2016 at 11:46:38AM +0000, David Howells wrote:
> Mark Rutland <mark.rutland@....com> wrote:
> > 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.

That sounds good to me.

Thanks,
Mark.