linux-kernel - Re: [PATCH] Use 'imply' with SEV Kconfig CRYPTO dependencies

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Date:   Tue, 19 Jun 2018 11:46:58 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     Richard Weinberger <richard.weinberger@...il.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org,
        kvm <kvm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, felix@...dspaten.org
Subject: Re: [PATCH] Use 'imply' with SEV Kconfig CRYPTO dependencies

On Thu, Jun 14, 2018 at 07:08:26AM -0500, Brijesh Singh wrote:
> I think depends should look like this:
> 
> config KVM_AMD_SEV
>     def_bool y
>     bool "AMD Secure Encrypted Virtualization (SEV) support"
>     depends KVM_AMD && X86_64
>     depends CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m)

CRYPTO_DEV_CCP_DD - this still doesn't belong here. KVM_AMD_SEV doesn't
care about what kind of functionality the PSP needs to function and
select it - it should only depend on a single symbol.

Now, you can add a separate CRYPTO .config item which collects all
required functionality for SEV guests and have KVM_AMD_SEV depend
on that. Or a similar solution. But not have KVM_AMD_SEV poke into
CRYPTO...PSP dependencies because it doesn't need to know about it.

Thx.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--