linux-kernel - Re: [Part1 PATCH v6.1 14/17] x86: Add support for changing memory encryption attribute in early boot

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Date:   Mon, 16 Oct 2017 23:25:45 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [Part1 PATCH v6.1 14/17] x86: Add support for changing memory
 encryption attribute in early boot

On Mon, Oct 16, 2017 at 02:56:08PM -0500, Brijesh Singh wrote:
> Some KVM-specific custom MSRs share the guest physical address with the
> hypervisor in early boot. When SEV is active, the shared physical address
> must be mapped with memory encryption attribute cleared so that both
> hypervisor and guest can access the data.
> 
> Add APIs to change the memory encryption attribute in early boot code.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: x86@...nel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Improvements-by: Borislav Petkov <bp@...e.de>
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
> 
> Changes since v6:
>  * applied the improvements from Boris
> 
>  arch/x86/include/asm/mem_encrypt.h |   8 +++
>  arch/x86/mm/mem_encrypt.c          | 131 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 139 insertions(+)

Reviewed-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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