linux-kernel - Re: [PATCH RFC v9 05/51] x86/coco: move CONFIG_HAS_CC

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Date:   Mon, 10 Jul 2023 08:11:21 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Michael Roth <michael.roth@....com>, kvm@...r.kernel.org
Cc:     linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
        jroedel@...e.de, hpa@...or.com, ardb@...nel.org,
        pbonzini@...hat.com, seanjc@...gle.com, vkuznets@...hat.com,
        jmattson@...gle.com, luto@...nel.org, dave.hansen@...ux.intel.com,
        slp@...hat.com, pgonda@...gle.com, peterz@...radead.org,
        srinivas.pandruvada@...ux.intel.com, rientjes@...gle.com,
        dovmurik@...ux.ibm.com, tobin@....com, bp@...en8.de,
        vbabka@...e.cz, kirill@...temov.name, ak@...ux.intel.com,
        tony.luck@...el.com, marcorr@...gle.com, alpergun@...gle.com,
        dgilbert@...hat.com, jarkko@...nel.org, ashish.kalra@....com,
        nikunj.dadhania@....com, liam.merwick@...cle.com,
        zhi.a.wang@...el.com,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH RFC v9 05/51] x86/coco: move CONFIG_HAS_CC_PLATFORM check
 down into coco/Makefile

On 7/9/23 22:05, Sathyanarayanan Kuppuswamy wrote:
> Hi,
> 
> On 6/11/23 9:25 PM, Michael Roth wrote:
>> Currently CONFIG_HAS_CC_PLATFORM is a prereq for building anything in
>> arch/x86/coco, but that is generally only applicable for guest support.>
>> For SEV-SNP, helpers related purely to host support will also live in
>> arch/x86/coco. To allow for CoCo-related host support code in
>> arch/x86/coco, move that check down into the Makefile and check for it
>> specifically when needed.
> 
> 
> I think CONFIG_HAS_CC_PLATFORM is not meant to be guest specific (otherwise,

Correct, it is used in bare-metal for SME support, so that needs to 
continue to work.

Thanks,
Tom

> we could have named it CONFIG_HAS_CC_GUEST). Will it create any issue if
> we enable it in host?
> 
>>
>> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
>> Suggested-by: Tom Lendacky <thomas.lendacky@....com>
>> Signed-off-by: Michael Roth <michael.roth@....com>
>> ---
>>   arch/x86/Kbuild        | 2 +-
>>   arch/x86/coco/Makefile | 2 +-
>>   2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild
>> index 5a83da703e87..1889cef48b58 100644
>> --- a/arch/x86/Kbuild
>> +++ b/arch/x86/Kbuild
>> @@ -1,5 +1,5 @@
>>   # SPDX-License-Identifier: GPL-2.0
>> -obj-$(CONFIG_ARCH_HAS_CC_PLATFORM) += coco/
>> +obj-y += coco/
>>   
>>   obj-y += entry/
>>   
>> diff --git a/arch/x86/coco/Makefile b/arch/x86/coco/Makefile
>> index c816acf78b6a..6aa52e719bf5 100644
>> --- a/arch/x86/coco/Makefile
>> +++ b/arch/x86/coco/Makefile
>> @@ -3,6 +3,6 @@ CFLAGS_REMOVE_core.o	= -pg
>>   KASAN_SANITIZE_core.o	:= n
>>   CFLAGS_core.o		+= -fno-stack-protector
>>   
>> -obj-y += core.o
>> +obj-$(CONFIG_ARCH_HAS_CC_PLATFORM) += core.o
>>   
>>   obj-$(CONFIG_INTEL_TDX_GUEST)	+= tdx/
>