linux-kernel - Re: [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI interface

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Date:   Wed, 27 Sep 2017 09:46:15 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Mario.Limonciello@...l.com
Cc:     pali.rohar@...il.com, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, quasisec@...gle.com
Subject: Re: [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI
 interface

On Mon, Sep 25, 2017 at 07:28:57PM +0000, Mario.Limonciello@...l.com wrote:
> 
> 
> > -----Original Message-----
> > From: Pali Rohár [mailto:pali.rohar@...il.com]
> > Sent: Monday, September 25, 2017 12:19 PM
> > To: Limonciello, Mario <Mario_Limonciello@...l.com>
> > Cc: dvhart@...radead.org; LKML <linux-kernel@...r.kernel.org>; platform-driver-
> > x86@...r.kernel.org; quasisec@...gle.com
> > Subject: Re: [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI
> > interface
> > 
> > On Thursday 21 September 2017 08:57:09 Mario Limonciello wrote:
> > > The driver currently uses an SMI interface which grants direct access
> > > to physical memory to the platform via a pointer.
> > >
> > > Changing this to operate over WMI-ACPI will use an ACPI OperationRegion
> > > for a buffer of data storage when platform calls are performed.
> > >
> > > This is a safer approach to use in kernel drivers as the platform will
> > > only have access to that OperationRegion.
> > 
> > In my opinion direct access is safer then using ACPI wrapper for same
> > functionality.
> 
> I'd like to hear how this is safer.

Again, I think the disconnect is around the term "platform". I think above you
can s/platform/SMM/ right?

-- 
Darren Hart
VMware Open Source Technology Center