linux-kernel - Re: [PATCH -v2] ACPI, APEI: Fix BERT resources conflict with ACPI NVS area

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Message-ID: <20170220094419.j6effubsn7qct55q@pd.tnic>
Date:   Mon, 20 Feb 2017 10:44:19 +0100
From:   Borislav Petkov <bp@...e.de>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Tomasz Nowicki <tomasz.nowicki@...aro.org>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -v2] ACPI, APEI: Fix BERT resources conflict with ACPI
 NVS area

On Mon, Feb 20, 2017 at 09:12:58AM +0800, Huang, Ying wrote:
> From: Huang Ying <ying.huang@...el.com>
> 
> It was reported that on some machines, there is overlap between ACPI
> NVS area and BERT address range.  This appears reasonable because BERT
> contents need to be non-volatile across reboot.  But this will cause
> resources conflict in current Linux kernel implementation because the
> ACPI NVS area is marked as busy.  The resource conflict is fixed via
> excluding the ACPI NVS area when requesting IO resources for BERT.
> When accessing the BERT contents, the whole BERT address range will be
> ioremapped and accessed.
> 
> Reported-and-tested-by: Hans Kristian Rosbach <hansr@...kesider.no>
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> ---
>  drivers/acpi/apei/bert.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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