linux-kernel - Re: [RFC PATCH v2 09/32] x86: Change early_ioremap to early

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Date:   Wed, 8 Mar 2017 09:46:02 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     simon.guinot@...uanux.org, linux-efi@...r.kernel.org,
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Subject: Re: [RFC PATCH v2 09/32] x86: Change early_ioremap to early_memremap
 for BOOT data

On Thu, Mar 02, 2017 at 10:13:53AM -0500, Brijesh Singh wrote:
> From: Tom Lendacky <thomas.lendacky@....com>
> 
> In order to map BOOT data with the proper encryption bit, the

Btw, what does that all-caps spelling "BOOT" denote? Something I'm
missing?

> early_ioremap() function calls are changed to early_memremap() calls.
> This allows the proper access for both SME and SEV.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> ---
>  arch/x86/kernel/acpi/boot.c |    4 ++--
>  arch/x86/kernel/mpparse.c   |   10 +++++-----
>  drivers/sfi/sfi_core.c      |    6 +++---
>  3 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index 35174c6..468c25a 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -124,7 +124,7 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
>  	if (!phys || !size)
>  		return NULL;
>  
> -	return early_ioremap(phys, size);
> +	return early_memremap(phys, size);

Right, the question will keep popping up why we can simply replace
memremap with ioremap and the general difference wrt to SME/SEV. So it
would be a good idea to have a comment in, say, arch/x86/mm/ioremap.c,
explaining the general situation.

Thanks.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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