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Re: [Xen-devel] [PATCH v7 23/36] x86, realmode: Decrypt trampoline area if memory encryption is active
- To: Tom Lendacky <thomas.lendacky@xxxxxxx>
- From: Borislav Petkov <bp@xxxxxxxxx>
- Date: Wed, 21 Jun 2017 11:43:24 +0200
- Cc: linux-efi@xxxxxxxxxxxxxxx, Brijesh Singh <brijesh.singh@xxxxxxx>, Toshimitsu Kani <toshi.kani@xxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, linux-mm@xxxxxxxxx, Radim Krčmář <rkrcmar@xxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Larry Woodman <lwoodman@xxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Jonathan Corbet <corbet@xxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, kasan-dev@xxxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>, Dave Young <dyoung@xxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, kexec@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>
- Delivery-date: Wed, 21 Jun 2017 09:43:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Fri, Jun 16, 2017 at 01:54:12PM -0500, Tom Lendacky wrote:
> When Secure Memory Encryption is enabled, the trampoline area must not
> be encrypted. A CPU running in real mode will not be able to decrypt
> memory that has been encrypted because it will not be able to use addresses
> with the memory encryption mask.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> ---
> arch/x86/realmode/init.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
Subject: x86/realmode: ...
other than that:
Reviewed-by: Borislav Petkov <bp@xxxxxxx>
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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