linux-kernel - Re: [PATCH] firmware: export x86_64 platform flash bios region via sysfs

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Message-ID: <C7D4E238-04FA-4C96-9D54-89CD649B6CBC@getmailspring.com>
Date:   Tue, 9 Nov 2021 11:30:06 +0100
From:   Philipp Deppenwiese <philipp.deppenwiese@...u.ne>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Hans-Gert Dahmen <hans-gert.dahmen@...u.ne>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" 
        <linux-kernel@...r.kernel.org>,
        "mauro.lima@...ypsium.com" <mauro.lima@...ypsium.com>,
        "hughsient@...il.com" <hughsient@...il.com>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH] firmware: export x86_64 platform flash bios region
 via sysfs

Hi Greg,

sorry for the previous html email, totally forgot kernel ml was plain
text only.

Just some feedback regarding the use case for the interface. As you may
know the firmware (BIOS/UEFI/coreboot) is growing massively in the last
few years. So we have now 32MB of firmware on a normal x86 system. The
interface shall be used as safe and secure method to get the first 16MB
read-only copy of the firmware. The interface from Intel is read-only so
we shouldn't introduce any security issues here.

Aside from us there is fwupd.org and another company which are
interested in the interface as well. We have added Richard from Redhat
to the CC. We use the interface mainly for firmware analysis and TPM PCR
pre-calculation features in our SaaS product.

I hope that resolves your questions :). Let me know if you want to
discuss more.

@Hans-Gert can you deliver the documentation, otherwise I can help out.

Greetings Philipp

On Nov. 9 2021, at 11:24 am, Greg KH <gregkh@...uxfoundation.org> wrote:

> On Tue, Nov 09, 2021 at 11:06:07AM +0100, Philipp Deppenwiese wrote:
>> Hi Greg,
>  
> <snip>
>  
> Sorry, html email is rejected by the mailing lists.  Please fix your
> email client to send text-only email and I will be glad to respond.
>  
> thanks,
>  
> greg k-h
>