linux-kernel - Re: [PATCH v2 4/4] virt: Add sev_secret module to expose confidential computing secrets

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Date:   Thu, 7 Oct 2021 06:32:41 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Dov Murik <dovmurik@...ux.ibm.com>, linux-efi@...r.kernel.org
Cc:     Borislav Petkov <bp@...e.de>, Ashish Kalra <ashish.kalra@....com>,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrew Scull <ascull@...gle.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@...ux.ibm.com>,
        Jim Cadden <jcadden@....com>,
        Daniele Buono <dbuono@...ux.vnet.ibm.com>,
        linux-coco@...ts.linux.dev, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] virt: Add sev_secret module to expose confidential
 computing secrets

On 10/6/21 11:18 PM, Dov Murik wrote:
> +static int sev_secret_map_area(void)
> +{
> +	struct sev_secret *s = sev_secret_get();
> +	struct linux_efi_coco_secret_area *secret_area;
> +	u32 secret_area_size;
> +
> +	if (efi.coco_secret == EFI_INVALID_TABLE_ADDR) {
> +		pr_err("Secret area address is not available\n");
> +		return -EINVAL;
> +	}
> +
> +	secret_area = memremap(efi.coco_secret, sizeof(*secret_area), MEMREMAP_WB);
> +	if (secret_area == NULL) {
> +		pr_err("Could not map secret area header\n");
> +		return -ENOMEM;
> +	}

There doesn't seem to be anything truly SEV-specific in here at all.
Isn't this more accurately called "efi_secret" or something?  What's to
prevent Intel or an ARM vendor from implementing this?