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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210219_115700_468778_E4965C78 X-CRM114-Status: GOOD ( 30.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Stephen Rothwell , Benjamin Herrenschmidt , devicetree@vger.kernel.org, Greg Kroah-Hartman , linuxppc-dev , "linux-kernel@vger.kernel.org" , Mimi Zohar , "AKASHI, Takahiro" , James Morse , Michael Ellerman , Catalin Marinas , Joe Perches , linux-integrity@vger.kernel.org, Will Deacon , Thiago Jung Bauermann , linux-arm-kernel Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/19/21 6:16 AM, Rob Herring wrote: > On Thu, Feb 18, 2021 at 8:53 PM Lakshmi Ramasubramanian > wrote: >> >> On 2/18/21 5:13 PM, Thiago Jung Bauermann wrote: >>> >>> Lakshmi Ramasubramanian 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 >>>>>> Fixes: 33488dc4d61f ("of: Add a common kexec FDT setup function") >>>>>> Reported-by: kernel test robot >>>>>> --- >>>>>> 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. > > I'd just move the fields to kimage. > I think Mimi's suggestion to use CONFIG_HAVE_IMA_KEXEC for building drivers/of/kexec.c would work and also avoid the bisect issue if we do the following: - In the patch set for carrying forward the IMA log on kexec, move the following patch to a later point in the set "[PATCH v18 04/11] arm64: Use common of_kexec_alloc_and_setup_fdt()" and merge the above patch with the following patch "[PATCH v18 11/11] arm64: Enable passing IMA log to next kernel on kexec" I will try this now, and update. thanks, -lakshmi _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel