linux-kernel - Re: [PATCH v10 20/50] KVM: SEV: Select CONFIG_KVM_SW_PROTECTED_VM when CONFIG_KVM_AMD

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Date: Mon, 18 Dec 2023 11:13:50 +0100
From: Borislav Petkov <bp@...en8.de>
To: Michael Roth <michael.roth@....com>
Cc: kvm@...r.kernel.org, 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,
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	jarkko@...nel.org, ashish.kalra@....com, nikunj.dadhania@....com,
	pankaj.gupta@....com, liam.merwick@...cle.com, zhi.a.wang@...el.com
Subject: Re: [PATCH v10 20/50] KVM: SEV: Select CONFIG_KVM_SW_PROTECTED_VM
 when CONFIG_KVM_AMD_SEV=y

On Mon, Oct 16, 2023 at 08:27:49AM -0500, Michael Roth wrote:
> SEV-SNP relies on the restricted/protected memory support to run guests,
> so make sure to enable that support with the
> CONFIG_KVM_SW_PROTECTED_VM build option.
> 
> Signed-off-by: Michael Roth <michael.roth@....com>
> ---
>  arch/x86/kvm/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index 8452ed0228cb..71dc506aa3fb 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -126,6 +126,7 @@ config KVM_AMD_SEV
>  	bool "AMD Secure Encrypted Virtualization (SEV) support"
>  	depends on KVM_AMD && X86_64
>  	depends on CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m)
> +	select KVM_SW_PROTECTED_VM
>  	help
>  	  Provides support for launching Encrypted VMs (SEV) and Encrypted VMs
>  	  with Encrypted State (SEV-ES) on AMD processors.
> -- 

Kconfig doesn't like this one:

WARNING: unmet direct dependencies detected for KVM_SW_PROTECTED_VM
  Depends on [n]: VIRTUALIZATION [=y] && EXPERT [=n] && X86_64 [=y]
  Selected by [m]:
  - KVM_AMD_SEV [=y] && VIRTUALIZATION [=y] && KVM_AMD [=m] && X86_64 [=y] && CRYPTO_DEV_SP_PSP [=y] && (KVM_AMD [=m]!=y || CRYPTO_DEV_CCP_DD [=m]!=m)

WARNING: unmet direct dependencies detected for KVM_SW_PROTECTED_VM
  Depends on [n]: VIRTUALIZATION [=y] && EXPERT [=n] && X86_64 [=y]
  Selected by [m]:
  - KVM_AMD_SEV [=y] && VIRTUALIZATION [=y] && KVM_AMD [=m] && X86_64 [=y] && CRYPTO_DEV_SP_PSP [=y] && (KVM_AMD [=m]!=y || CRYPTO_DEV_CCP_DD [=m]!=m)


-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette