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

[Borislav Petkov]

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@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxx>
> Cc: x86@xxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
> Improvements-by: Borislav Petkov <bp@xxxxxxx>
> Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
> ---
> 
> 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@xxxxxxx>

-- 
Regards/Gruss,
    Boris.

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