linux-kernel - Re: [PATCH v2] crypto: ccp: Add support for SEV-ES to the PSP driver

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Message-ID: <20200429112315.GO21900@8bytes.org>
Date:   Wed, 29 Apr 2020 13:23:15 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>,
        Borislav Petkov <bp@...en8.de>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH v2] crypto: ccp: Add support for SEV-ES to the PSP driver

On Tue, Apr 21, 2020 at 12:44:49PM -0500, Tom Lendacky wrote:
> To provide support for SEV-ES, the hypervisor must provide an area of
> memory to the PSP. Once this Trusted Memory Region (TMR) is provided to
> the PSP, the contents of this area of memory are no longer available to
> the x86.
> 
> Update the PSP driver to allocate a 1MB region for the TMR that is 1MB
> aligned and then provide it to the PSP through the SEV INIT command.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
> 
> ---
> 
> Changes since v1:
> - No need to over-allocate the memory area to obtain the required
>   alignment when using the page allocator.

Reviewed-by: Joerg Roedel <jroedel@...e.de>