linux-kernel - Re: [PATCH v4 10/14] platform/x86: dell-smbios-smm: test for WSMT

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Date:   Wed, 4 Oct 2017 18:59:44 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Mario Limonciello <mario.limonciello@...l.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>, quasisec@...gle.com,
        pali.rohar@...il.com, rjw@...ysocki.net, mjg59@...gle.com,
        hch@....de, Greg KH <greg@...ah.com>
Subject: Re: [PATCH v4 10/14] platform/x86: dell-smbios-smm: test for WSMT

On Wed, Oct 04, 2017 at 05:48:36PM -0500, Mario Limonciello wrote:
> WSMT is as an attestation to the OS that the platform won't
> modify memory outside of pre-defined areas.
> 
> If a platform has WSMT enabled in BIOS setup, SMM calls through
> dcdbas will fail.  The only way to access platform data in these
> instances is through the WMI SMBIOS calling interface.

Nit: This should probably come after 11/14 where the WMI SMBIOS calling
interface is introduced.

-- 
Darren Hart
VMware Open Source Technology Center