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Date: Thu, 15 Sep 2016 11:43:08 +1000
From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Cc: kexec@lists.infradead.org, linux-ima-devel@lists.sourceforge.net,
        linuxppc-dev@lists.ozlabs.org, x86@kernel.org,
        linux-kernel@vger.kernel.org, Eric Biederman <ebiederm@xmission.com>,
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        Baoquan He <bhe@redhat.com>, Michael Ellerman <mpe@ellerman.id.au>,
        Stewart Smith <stewart@linux.vnet.ibm.com>,
        Mimi Zohar <zohar@linux.vnet.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v5 1/5] kexec_file: Include the purgatory segment in the
 kexec image checksum.
Message-ID: <20160915114308.19195f71@canb.auug.org.au>
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Hi Thiago,

> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 2a1f0ce7c59a..dcd1679f3005 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1792,6 +1792,11 @@ config SECCOMP
>  
>  source kernel/Kconfig.hz
>  
> +# x86 needs to relocate the purgatory after the checksum is calculated,
> +# therefore the purgatory cannot be part of the kexec image checksum.
> +config ARCH_MODIFIES_KEXEC_PURGATORY
> +	bool
> +

The above should probably be in arch/Kconfig (with an appropriately
changed comment) since it is used in generic code.
-- 
Cheers,
Stephen Rothwell