linux-kernel - Re: [RFC PATCH 02/12] powerpc: Add support for adding an ESM blob to the zImage wrapper

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Date:   Tue, 21 May 2019 07:13:26 +0200
From:   Christoph Hellwig <hch@....de>
To:     Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Anshuman Khandual <anshuman.linux@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christoph Hellwig <hch@....de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mike Anderson <andmike@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Ram Pai <linuxram@...ibm.com>,
        Claudio Carvalho <cclaudio@...ux.ibm.com>
Subject: Re: [RFC PATCH 02/12] powerpc: Add support for adding an ESM blob
 to the zImage wrapper

On Tue, May 21, 2019 at 01:49:02AM -0300, Thiago Jung Bauermann wrote:
> From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> 
> For secure VMs, the signing tool will create a ticket called the "ESM blob"
> for the Enter Secure Mode ultravisor call with the signatures of the kernel
> and initrd among other things.
> 
> This adds support to the wrapper script for adding that blob via the "-e"
> option to the zImage.pseries.
> 
> It also adds code to the zImage wrapper itself to retrieve and if necessary
> relocate the blob, and pass its address to Linux via the device-tree, to be
> later consumed by prom_init.

Where does the "BLOB" come from?  How is it licensed and how can we
satisfy the GPL with it?