[PATCH 00/12] Introduce support for Dell SMBIOS over WMI

From	Mario Limonciello <mario.limonciello@dell.com>
Newsgroups	linux.kernel
Subject	[PATCH 00/12] Introduce support for Dell SMBIOS over WMI
Date	2017-09-21 16:00 +0200
Message-ID	<usabf-1IE-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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The existing way that the dell-smbios helper module and associated
other drivers (dell-laptop, dell-wmi) communicate with the platform
really isn't secure.  It requires creating a buffer in physical
DMA32 memory space and passing that to the platform via SMM.

Since the platform got a physical memory pointer, you've just got
to trust that the platform has only modified (and accessed) memory
within that buffer.

Dell Platform designers recognize this security risk and offer a
safer way to communicate with the platform over ACPI.  This is
in turn exposed via a WMI interface to the OS.

When communicating over WMI-ACPI the communication doesn't occur
with physical memory pointers.  When the ASL is invoked, the fixed
length ACPI buffer is copied to a small operating region.  The ASL
will invoke the SMI, and SMM will only have access to this operating
region.  When the ASL returns the buffer is copied back for the OS
to process.

This method of communication should also deprecate the usage of the
dcdbas kernel module and software dependent upon it's interface.
Instead offer a syfs interface for communicating with this ASL
method to allow userspace to use instead.

To faciliate that needs for userspace and kernel space this patch
series introduces a generic way for WMI drivers to be able to
create character devices through the WMI bus when desired.
Requiring WMI drivers to explictly ask for this functionality will
act as an effective vendor whitelist.

Mario Limonciello (12):
  platform/x86: dell-wmi: label driver as handling notifications
  platform/x86: dell-wmi: Don't match on descriptor GUID modalias
  platform/x86: dell-smbios: Add pr_fmt definition to driver
  platform/x86: dell-smbios: Switch to a WMI-ACPI interface
  platform/x86: dell-smbios: rename to dell-wmi-smbios
  platform/x86: dell-wmi-smbios: Add a sysfs interface for SMBIOS tokens
  platform/x86: dell-wmi-smbios: Use Dell WMI descriptor check
  platform/x86: wmi: Cleanup exit routine in reverse order of init
  platform/x86: wmi: create character devices when requested by drivers
  platform/x86: wmi: destroy on cleanup rather than unregister
  platform/x86: dell-wmi-smbios: introduce character device for
    userspace
  platform/x86: Kconfig: Change the default settings for dell-wmi-smbios

 Documentation/ABI/testing/dell-wmi-smbios          |  19 +
 .../ABI/testing/sysfs-platform-dell-wmi-smbios     |  16 +
 MAINTAINERS                                        |   8 +-
 drivers/platform/x86/Kconfig                       |  13 +-
 drivers/platform/x86/Makefile                      |   2 +-
 drivers/platform/x86/dell-laptop.c                 |   2 +-
 drivers/platform/x86/dell-smbios.c                 | 213 ----------
 drivers/platform/x86/dell-wmi-smbios.c             | 444 +++++++++++++++++++++
 .../x86/{dell-smbios.h => dell-wmi-smbios.h}       |  23 +-
 drivers/platform/x86/dell-wmi.c                    |  78 +---
 drivers/platform/x86/wmi.c                         | 104 ++++-
 include/linux/wmi.h                                |   1 +
 12 files changed, 610 insertions(+), 313 deletions(-)
 create mode 100644 Documentation/ABI/testing/dell-wmi-smbios
 create mode 100644 Documentation/ABI/testing/sysfs-platform-dell-wmi-smbios
 delete mode 100644 drivers/platform/x86/dell-smbios.c
 create mode 100644 drivers/platform/x86/dell-wmi-smbios.c
 rename drivers/platform/x86/{dell-smbios.h => dell-wmi-smbios.h} (75%)

-- 
2.14.1

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[PATCH 00/12] Introduce support for Dell SMBIOS over WMI Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
  [PATCH 08/12] platform/x86: wmi: Cleanup exit routine in reverse order of init Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
  [PATCH 02/12] platform/x86: dell-wmi: Don't match on descriptor GUID modalias Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 02/12] platform/x86: dell-wmi: Don't match on descriptor  GUID modalias Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:10 +0200
  [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI interface Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI  interface Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:30 +0200
      RE: [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI  interface <Mario.Limonciello@dell.com> - 2017-09-25 21:30 +0200
  [PATCH 12/12] platform/x86: Kconfig: Change the default settings for dell-wmi-smbios Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
  [PATCH 01/12] platform/x86: dell-wmi: label driver as handling notifications Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 01/12] platform/x86: dell-wmi: label driver as handling  notifications Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:10 +0200
      RE: [PATCH 01/12] platform/x86: dell-wmi: label driver as handling  notifications <Mario.Limonciello@dell.com> - 2017-09-25 22:20 +0200
  [PATCH 10/12] platform/x86: wmi: destroy on cleanup rather than unregister Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
  [PATCH 07/12] platform/x86: dell-wmi-smbios: Use Dell WMI descriptor check Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 07/12] platform/x86: dell-wmi-smbios: Use Dell WMI  descriptor check Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-09-21 18:50 +0200
      RE: [PATCH 07/12] platform/x86: dell-wmi-smbios: Use Dell WMI  descriptor check <Mario.Limonciello@dell.com> - 2017-09-21 23:00 +0200
  [PATCH 09/12] platform/x86: wmi: create character devices when requested by drivers Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 09/12] platform/x86: wmi: create character devices when  requested by drivers Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-09-21 18:50 +0200
      RE: [PATCH 09/12] platform/x86: wmi: create character devices when  requested by drivers <Mario.Limonciello@dell.com> - 2017-09-21 21:30 +0200
  [PATCH 03/12] platform/x86: dell-smbios: Add pr_fmt definition to driver Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:10 +0200
    Re: [PATCH 03/12] platform/x86: dell-smbios: Add pr_fmt definition to driver Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-09-21 18:30 +0200
    Re: [PATCH 03/12] platform/x86: dell-smbios: Add pr_fmt definition  to driver Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:10 +0200
  [PATCH 05/12] platform/x86: dell-smbios: rename to dell-wmi-smbios Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:10 +0200
  Re: [PATCH 00/12] Introduce support for Dell SMBIOS over WMI Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:20 +0200
    RE: [PATCH 00/12] Introduce support for Dell SMBIOS over WMI <Mario.Limonciello@dell.com> - 2017-09-25 18:40 +0200
      Re: [PATCH 00/12] Introduce support for Dell SMBIOS over WMI Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:50 +0200
        RE: [PATCH 00/12] Introduce support for Dell SMBIOS over WMI <Mario.Limonciello@dell.com> - 2017-09-25 21:30 +0200

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