linux-kernel - Re: [PATCH 1/3] platform/x86: Add Intel Software Defined Silicon driver

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Message-ID: <YfjzEQnvpH7hUZYa@kroah.com>
Date:   Tue, 1 Feb 2022 09:45:05 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     "David E. Box" <david.e.box@...ux.intel.com>
Cc:     hdegoede@...hat.com, andriy.shevchenko@...ux.intel.com,
        srinivas.pandruvada@...el.com, mgross@...ux.intel.com,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        Mark Gross <markgross@...nel.org>
Subject: Re: [PATCH 1/3] platform/x86: Add Intel Software Defined Silicon
 driver

On Mon, Jan 31, 2022 at 07:04:22PM -0800, David E. Box wrote:
> Intel Software Defined Silicon (SDSi) is a post manufacturing mechanism for
> activating additional silicon features. Features are enabled through a
> license activation process.  The SDSi driver provides a per socket, sysfs
> attribute interface for applications to perform 3 main provisioning
> functions:
> 
> 1. Provision an Authentication Key Certificate (AKC), a key written to
>    internal NVRAM that is used to authenticate a capability specific
>    activation payload.
> 
> 2. Provision a Capability Activation Payload (CAP), a token authenticated
>    using the AKC and applied to the CPU configuration to activate a new
>    feature.
> 
> 3. Read the SDSi State Certificate, containing the CPU configuration
>    state.
> 
> The operations perform function specific mailbox commands that forward the
> requests to SDSi hardware to perform authentication of the payloads and
> enable the silicon configuration (to be made available after power
> cycling).
> 
> The SDSi device itself is enumerated as an auxiliary device from the
> intel_vsec driver and as such has a build dependency on CONFIG_INTEL_VSEC.
> 
> Link: https://github.com/intel/intel-sdsi
> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
> Reviewed-by: Mark Gross <markgross@...nel.org>
> ---
>  .../ABI/testing/sysfs-driver-intel_sdsi       |  77 +++
>  MAINTAINERS                                   |   5 +
>  drivers/platform/x86/intel/Kconfig            |  12 +
>  drivers/platform/x86/intel/Makefile           |   2 +
>  drivers/platform/x86/intel/sdsi.c             | 571 ++++++++++++++++++
>  drivers/platform/x86/intel/vsec.c             |  12 +-
>  6 files changed, 678 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-intel_sdsi
>  create mode 100644 drivers/platform/x86/intel/sdsi.c
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-intel_sdsi b/Documentation/ABI/testing/sysfs-driver-intel_sdsi
> new file mode 100644
> index 000000000000..126978647e9b
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-intel_sdsi
> @@ -0,0 +1,77 @@
> +What:		/sys/bus/auxiliary/devices/intel_vsec.sdsi.X
> +Date:		Dec 2021
> +KernelVersion:	5.17

5.17 merge window is long gone now.

Please be more careful.