Re: [PATCH 1/3] x86, s390: Move ARCH_HAS_MEM_ENCRYPT definition to arch/Kconfig

From: Thiago Jung Bauermann <bauerman@linux.ibm.com>
To: janani@linux.ibm.com
Cc: linux-s390@vger.kernel.org, x86@kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Linuxppc-dev
	<linuxppc-dev-bounces+janani=linux.ibm.com@lists.ozlabs.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	linuxppc-dev@lists.ozlabs.org,
	Mike Anderson <andmike@linux.ibm.com>,
	Ram Pai <linuxram@us.ibm.com>,
	linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
	Halil Pasic <pasic@linux.ibm.com>,
	iommu@lists.linux-foundation.org, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>, "H. Peter Anvin" <hpa@zytor.com>,
	linux-fsdevel@vger.kernel.org,
	Thomas Lendacky <Thomas.Lendacky@amd.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Alexey Dobriyan <adobriyan@gmail.com>
Subject: Re: [PATCH 1/3] x86, s390: Move ARCH_HAS_MEM_ENCRYPT definition to arch/Kconfig
Date: Mon, 15 Jul 2019 17:00:01 -0300	[thread overview]
Message-ID: <877e8jnk5a.fsf@morokweng.localdomain> (raw)
In-Reply-To: <3dc137a99c73b1b6582fc854844a417e@linux.vnet.ibm.com>

Hello Janani,

Thanks for reviewing the patch.

janani <janani@linux.ibm.com> writes:

> On 2019-07-12 23:45, Thiago Jung Bauermann wrote:
>> powerpc is also going to use this feature, so put it in a generic location.
>>
>> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
>> ---
>>  arch/Kconfig      | 3 +++
>>  arch/s390/Kconfig | 3 ---
>>  arch/x86/Kconfig  | 4 +---
>>  3 files changed, 4 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/Kconfig b/arch/Kconfig
>> index c47b328eada0..4ef3499d4480 100644
>> --- a/arch/Kconfig
>> +++ b/arch/Kconfig
>> @@ -927,6 +927,9 @@ config LOCK_EVENT_COUNTS
>>  	  the chance of application behavior change because of timing
>>  	  differences. The counts are reported via debugfs.
>>
>> +config ARCH_HAS_MEM_ENCRYPT
>> +	bool
>> +
>>  source "kernel/gcov/Kconfig"
>>
>>  source "scripts/gcc-plugins/Kconfig"
>> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
>> index 5d8570ed6cab..f820e631bf89 100644
>> --- a/arch/s390/Kconfig
>> +++ b/arch/s390/Kconfig
>> @@ -1,7 +1,4 @@
>>  # SPDX-License-Identifier: GPL-2.0
>> -config ARCH_HAS_MEM_ENCRYPT
>> -        def_bool y
>> -
>
>  Since you are removing the "def_bool y" when ARCH_HAS_MEM_ENCRYPT is moved to
> arch/Kconfig, does the s390/Kconfig need "select ARCH_HAS_MEM_ENCRYPT" added
> like you do for x86/Kconfig?

Indeed, I missed that. Thanks for spotting it!

>
>  - Janani
>
>>  config MMU
>>  	def_bool y
>>
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index c9f331bb538b..5d3295f2df94 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -68,6 +68,7 @@ config X86
>>  	select ARCH_HAS_FORTIFY_SOURCE
>>  	select ARCH_HAS_GCOV_PROFILE_ALL
>>  	select ARCH_HAS_KCOV			if X86_64
>> +	select ARCH_HAS_MEM_ENCRYPT
>>  	select ARCH_HAS_MEMBARRIER_SYNC_CORE
>>  	select ARCH_HAS_PMEM_API		if X86_64
>>  	select ARCH_HAS_PTE_SPECIAL
>> @@ -1520,9 +1521,6 @@ config X86_CPA_STATISTICS
>>  	  helps to determine the effectiveness of preserving large and huge
>>  	  page mappings when mapping protections are changed.
>>
>> -config ARCH_HAS_MEM_ENCRYPT
>> -	def_bool y
>> -
>>  config AMD_MEM_ENCRYPT
>>  	bool "AMD Secure Memory Encryption (SME) support"
>>  	depends on X86_64 && CPU_SUP_AMD

-- 
Thiago Jung Bauermann
IBM Linux Technology Center

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