linux-kernel - Re: [PATCH 1/3] x86, s390: Move ARCH_HAS_MEM

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Date:   Mon, 15 Jul 2019 10:23:08 -0500
From:   janani <janani@...ux.ibm.com>
To:     Thiago Jung Bauermann <bauerman@...ux.ibm.com>
Cc:     x86@...nel.org, linux-s390@...r.kernel.org,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Robin Murphy <robin.murphy@....com>,
        Mike Anderson <andmike@...ux.ibm.com>,
        Ram Pai <linuxram@...ibm.com>, linux-kernel@...r.kernel.org,
        Alexey Dobriyan <adobriyan@...il.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        iommu@...ts.linux-foundation.org, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Lendacky <Thomas.Lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-fsdevel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        linuxppc-dev@...ts.ozlabs.org, Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Linuxppc-dev 
        <linuxppc-dev-bounces+janani=linux.ibm.com@...ts.ozlabs.org>
Subject: Re: [PATCH 1/3] x86, s390: Move ARCH_HAS_MEM_ENCRYPT definition to
 arch/Kconfig

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@...ux.ibm.com>
> Reviewed-by: Thomas Gleixner <tglx@...utronix.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?

  - 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