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Message-ID: <fd4cf001-b600-a09e-050b-2b5ed94922da@linux.intel.com>
Date: Sun, 9 Jul 2023 20:05:09 -0700
From: Sathyanarayanan Kuppuswamy
<sathyanarayanan.kuppuswamy@...ux.intel.com>
To: 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, thomas.lendacky@....com, 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
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,
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/
--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer
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