linux-kernel - Re: [PATCH v7 43/45] virt: Add SEV-SNP guest driver

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Date:   Wed, 10 Nov 2021 14:27:25 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Brijesh Singh <brijesh.singh@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Borislav Petkov <bp@...en8.de>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andi Kleen <ak@...ux.intel.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH v7 43/45] virt: Add SEV-SNP guest driver

Hi,

On 11/10/21 2:07 PM, Brijesh Singh wrote:
> diff --git a/drivers/virt/coco/sevguest/Kconfig b/drivers/virt/coco/sevguest/Kconfig
> new file mode 100644
> index 000000000000..96190919cca8
> --- /dev/null
> +++ b/drivers/virt/coco/sevguest/Kconfig
> @@ -0,0 +1,9 @@
> +config SEV_GUEST
> +	tristate "AMD SEV Guest driver"
> +	default y

For this to remain as "default y", you need to justify it.
E.g., if a board cannot boot with an interrupt controller,
the driver for the interrupt controller can be "default y".

So why is this default y?
No other drivers in drivers/virt/ are default y.

> +	depends on AMD_MEM_ENCRYPT && CRYPTO_AEAD2
> +	help
> +	  The driver can be used by the SEV-SNP guest to communicate with the PSP to
> +	  request the attestation report and more.
> +
> +	  If you choose 'M' here, this module will be called sevguest.

thanks.
-- 
~Randy