linux-kernel - Re: [PATCH v1 00/12] Intel FPGA Security Manager Class Driver

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Message-ID: <fa61fd85-71ae-77fb-a364-44a1df483957@redhat.com>
Date:   Sat, 5 Sep 2020 09:10:06 -0700
From:   Tom Rix <trix@...hat.com>
To:     Russ Weight <russell.h.weight@...el.com>, mdf@...nel.org,
        lee.jones@...aro.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     lgoncalv@...hat.com, yilun.xu@...el.com, hao.wu@...el.com,
        matthew.gerlach@...el.com
Subject: Re: [PATCH v1 00/12] Intel FPGA Security Manager Class Driver


On 9/4/20 4:52 PM, Russ Weight wrote:
> These patches depend on the patchset: "add regmap-spi-avmm & Intel
> Max10 BMC chip support" which is currently under review.

https://marc.info/?l=linux-kernel&m=159782274232229&w=2

regmap-spi-avmm is in linux-next.

max10 is not. however applying it does not resolve resolve git am conflicts with yesterday's linux-next.  I normally build the larger patchsets as a test.

>            --------------------------------------------------
>
> This patchset introduces the Intel Security Manager class driver
> for managing secure updates on Intel FPGA Cards. It also provides
> the n3000bmc-secure mfd sub-driver for the MAX10 BMC for the n3000
> Programmable Acceleration Cards (PAC). The n3000bmc-secure driver
> is implemented using the Intel Security Manager class driver.
>
> The Intel Security Manager class driver provides a common API for
> user-space tools to manage updates for Secure FPGA devices. Device
> drivers that instantiate the Intel Security Manager class driver will
> interact with the HW secure update engine in order to transfer
> new FPGA and BMC images to FLASH so that they will be automatically
> loaded when the FPGA card reboots.
>
> The API consists of sysfs nodes and supports the following functions:
>
> (1) Instantiate and monitor a secure update
> (2) Display security information including: Root Entry Hashes (REH),
>     Cancelled Code Signing Keys (CSK), and flash update counts for
>     both BMC and FPGA images.
>
> Secure updates make use of the request_firmware framework, which
> requires that image files are accessible under /lib/firmware. A request
> for a secure update returns immediately, while the update itself
> proceeds in the context of a kernel worker thread. Sysfs files provide
> a means for monitoring the progress of a secure update and for
> retrieving error information in the event of a failure.
>
> The n3000bmc-secure driver instantiates the Intel Security Manager
> class driver and provides the callback functions required to support
> secure updates on Intel n3000 PAC devices.

This is a good description.  Because security manager is a new interface, there should be a Documentation/fpga/ifpga-sec-mgr.rst to collect this description.

How will these devices be discovered ? n3000 is a dfl device, will there be a dfl feature id for it at some point ? 

Can you describe if/how the security manager would live outside of dfl ?  I am wondering why this shouldn't be dfl-sec-mgr. 

I did not see any version handling.  How would this sw adapt to a newer or older version of the bmc interface?

Tom

>
> Russ Weight (12):
>   fpga: fpga security manager class driver
>   fpga: create intel max10 bmc security engine
>   fpga: expose max10 flash update counts in sysfs
>   fpga: expose max10 canceled keys in sysfs
>   fpga: enable secure updates
>   fpga: add max10 secure update functions
>   fpga: expose sec-mgr update status
>   fpga: expose sec-mgr update errors
>   fpga: expose sec-mgr update size
>   fpga: enable sec-mgr update cancel
>   fpga: expose hardware error info in sysfs
>   fpga: add max10 get_hw_errinfo callback func
>
>  .../ABI/testing/sysfs-class-ifpga-sec-mgr     | 151 ++++
>  MAINTAINERS                                   |   8 +
>  drivers/fpga/Kconfig                          |  20 +
>  drivers/fpga/Makefile                         |   6 +
>  drivers/fpga/ifpga-sec-mgr.c                  | 669 ++++++++++++++++++
>  drivers/fpga/intel-m10-bmc-secure.c           | 557 +++++++++++++++
>  include/linux/fpga/ifpga-sec-mgr.h            | 201 ++++++
>  include/linux/mfd/intel-m10-bmc.h             | 116 +++
>  8 files changed, 1728 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-class-ifpga-sec-mgr
>  create mode 100644 drivers/fpga/ifpga-sec-mgr.c
>  create mode 100644 drivers/fpga/intel-m10-bmc-secure.c
>  create mode 100644 include/linux/fpga/ifpga-sec-mgr.h
>