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Date:   Thu, 18 Feb 2021 18:53:26 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>, robh@...nel.org,
        takahiro.akashi@...aro.org, gregkh@...uxfoundation.org,
        will@...nel.org, joe@...ches.com, catalin.marinas@....com,
        mpe@...erman.id.au, sfr@...b.auug.org.au, james.morse@....com,
        sashal@...nel.org, benh@...nel.crashing.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] of: error: 'const struct kimage' has no member named
 'arch'

On 2/18/21 5:13 PM, Thiago Jung Bauermann wrote:
> 
> Lakshmi Ramasubramanian <nramas@...ux.microsoft.com> writes:
> 
>> On 2/18/21 4:07 PM, Mimi Zohar wrote:
>>
>> Hi Mimi,
>>
>>> On Thu, 2021-02-18 at 14:33 -0800, Lakshmi Ramasubramanian wrote:
>>>> of_kexec_alloc_and_setup_fdt() defined in drivers/of/kexec.c builds
>>>> a new device tree object that includes architecture specific data
>>>> for kexec system call.  This should be defined only if the architecture
>>>> being built defines kexec architecture structure "struct kimage_arch".
>>>>
>>>> Define a new boolean config OF_KEXEC that is enabled if
>>>> CONFIG_KEXEC_FILE and CONFIG_OF_FLATTREE are enabled, and
>>>> the architecture is arm64 or powerpc64.  Build drivers/of/kexec.c
>>>> if CONFIG_OF_KEXEC is enabled.
>>>>
>>>> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
>>>> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function")
>>>> Reported-by: kernel test robot <lkp@...el.com>
>>>> ---
>>>>    drivers/of/Kconfig  | 6 ++++++
>>>>    drivers/of/Makefile | 7 +------
>>>>    2 files changed, 7 insertions(+), 6 deletions(-)
>>>>
>>>> diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
>>>> index 18450437d5d5..f2e8fa54862a 100644
>>>> --- a/drivers/of/Kconfig
>>>> +++ b/drivers/of/Kconfig
>>>> @@ -100,4 +100,10 @@ config OF_DMA_DEFAULT_COHERENT
>>>>    	# arches should select this if DMA is coherent by default for OF devices
>>>>    	bool
>>>>    +config OF_KEXEC
>>>> +	bool
>>>> +	depends on KEXEC_FILE
>>>> +	depends on OF_FLATTREE
>>>> +	default y if ARM64 || PPC64
>>>> +
>>>>    endif # OF
>>>> diff --git a/drivers/of/Makefile b/drivers/of/Makefile
>>>> index c13b982084a3..287579dd1695 100644
>>>> --- a/drivers/of/Makefile
>>>> +++ b/drivers/of/Makefile
>>>> @@ -13,11 +13,6 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
>>>>    obj-$(CONFIG_OF_RESOLVE)  += resolver.o
>>>>    obj-$(CONFIG_OF_OVERLAY) += overlay.o
>>>>    obj-$(CONFIG_OF_NUMA) += of_numa.o
>>>> -
>>>> -ifdef CONFIG_KEXEC_FILE
>>>> -ifdef CONFIG_OF_FLATTREE
>>>> -obj-y	+= kexec.o
>>>> -endif
>>>> -endif
>>>> +obj-$(CONFIG_OF_KEXEC) += kexec.o
>>>>      obj-$(CONFIG_OF_UNITTEST) += unittest-data/
>>> Is it possible to reuse CONFIG_HAVE_IMA_KEXEC here?
>>>
>>
>> For ppc64 CONFIG_HAVE_IMA_KEXEC is selected when CONFIG_KEXEC_FILE is enabled.
>> So I don't see a problem in reusing CONFIG_HAVE_IMA_KEXEC for ppc.
>>
>> But for arm64, CONFIG_HAVE_IMA_KEXEC is enabled in the final patch in the patch
>> set (the one for carrying forward IMA log across kexec for arm64). arm64 calls
>> of_kexec_alloc_and_setup_fdt() prior to enabling CONFIG_HAVE_IMA_KEXEC and hence
>> breaks the build for arm64.
> 
> One problem is that I believe that this patch won't placate the robot,
> because IIUC it generates config files at random and this change still
> allows hppa and s390 to enable CONFIG_OF_KEXEC.

I enabled CONFIG_OF_KEXEC for s390. With my patch applied, 
CONFIG_OF_KEXEC is removed. So I think the robot enabling this config 
would not be a problem.

> 
> Perhaps a new CONFIG_HAVE_KIMAGE_ARCH option? Not having that option
> would still allow building kexec.o, but would be used inside kexec.c to
> avoid accessing kimage.arch members.
> 

I think this is a good idea - a new CONFIG_HAVE_KIMAGE_ARCH, which will 
be selected by arm64 and ppc for now. I tried this, and it fixes the 
build issue.

Although, the name for the new config can be misleading since PARISC, 
for instance, also defines "struct kimage_arch". Perhaps, 
CONFIG_HAVE_ELF_KIMAGE_ARCH since of_kexec_alloc_and_setup_fdt() is 
accessing ELF specific fields in "struct kimage_arch"?

Rob/Mimi - please let us know which approach you think is better.

thanks,
  -lakshmi

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