linux-kernel - Re: [PATCH v12 2/4] powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c

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Message-ID: <de64bbaf-1568-b4a4-d76d-fc07a91d7c27@linux.microsoft.com>
Date:   Thu, 17 Dec 2020 14:11:13 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        "AKASHI, Takahiro" <takahiro.akashi@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        James Morse <james.morse@....com>,
        Sasha Levin <sashal@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Frank Rowand <frowand.list@...il.com>,
        vincenzo.frascino@....com, Mark Rutland <mark.rutland@....com>,
        dmitry.kasatkin@...il.com, James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Allison Randal <allison@...utok.net>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Bhupesh Sharma <bhsharma@...hat.com>,
        Matthias Brugger <mbrugger@...e.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>, tao.li@...o.com,
        Christophe Leroy <christophe.leroy@....fr>,
        Prakhar Srivastava <prsriva@...ux.microsoft.com>,
        balajib@...ux.microsoft.com, linux-integrity@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v12 2/4] powerpc: Move arch independent ima kexec
 functions to drivers/of/kexec.c

On 12/17/20 2:01 PM, Rob Herring wrote:
> On Thu, Dec 17, 2020 at 2:52 PM Lakshmi Ramasubramanian
> <nramas@...ux.microsoft.com> wrote:
>>
>> On 12/17/20 12:05 PM, Rob Herring wrote:
>>> On Thu, Dec 17, 2020 at 09:37:06AM -0800, Lakshmi Ramasubramanian wrote:
>>>> The functions defined in "arch/powerpc/kexec/ima.c" handle setting up
>>>> and freeing the resources required to carry over the IMA measurement
>>>> list from the current kernel to the next kernel across kexec system call.
>>>> These functions do not have architecture specific code, but are
>>>> currently limited to powerpc.
> 
> [...]
> 
>>>> +#ifdef CONFIG_IMA_KEXEC
>>>> +/**
>>>> + * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
>>>> + *
>>>> + * @image: kimage struct to set IMA buffer data
>>>> + * @load_addr: Starting address where IMA buffer is loaded at
>>>> + * @size: Number of bytes in the IMA buffer
>>>> + *
>>>> + * Architectures should use this function to pass on the IMA buffer
>>>> + * information to the next kernel.
>>>> + *
>>>> + * Return: 0 on success, negative errno on error.
>>>> + */
>>>> +int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
>>>> +                          size_t size)
>>>
>>> This should be a static inline in asm/kexec.h.
>>
>> arch_ima_add_kexec_buffer() is identical for powerpc and arm64.
>> Would it be better to "static inline" this function in "of.h" instead of
>> duplicating it in "asm/kexec.h" for powerpc and arm64?
> 
> No, think about what it is specific to and place it there. It has
> nothing to do with DT really. All it is is a wrapper to access the
> struct members in kimage_arch. So it belongs where they are declared.
> Now perhaps ima_buffer_addr and ima_buffer_size shouldn't be arch
> specific, but that's a separate issue.
> 

okay - I'll move arch_ima_add_kexec_buffer() to asm/kexec.h

Please let me know if you have any other comments on the patches.
If you are done reviewing, I'll post the updated patches shortly.

Thanks for reviewing the changes.

  -lakshmi