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Re: [Xen-devel] [PATCH v7 06/36] x86/mm: Add Secure Memory Encryption (SME) support
- To: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- From: Tom Lendacky <thomas.lendacky@xxxxxxx>
- Date: Wed, 21 Jun 2017 08:26:44 -0500
- 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>, Borislav Petkov <bp@xxxxxxxxx>, 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, Paolo Bonzini <pbonzini@xxxxxxxxxx>
- Delivery-date: Wed, 21 Jun 2017 13:27:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
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On 6/20/2017 3:49 PM, Thomas Gleixner wrote:
On Fri, 16 Jun 2017, Tom Lendacky wrote:
+config ARCH_HAS_MEM_ENCRYPT
+ def_bool y
+ depends on X86
That one is silly. The config switch is in the x86 KConfig file, so X86 is
on. If you intended to move this to some generic place outside of
x86/Kconfig then this should be
config ARCH_HAS_MEM_ENCRYPT
bool
and x86/Kconfig should have
select ARCH_HAS_MEM_ENCRYPT
and that should be selected by AMD_MEM_ENCRYPT
This is used for deciding whether to include the asm/mem_encrypt.h file
so it needs to be on whether AMD_MEM_ENCRYPT is configured or not. I'll
leave it in the x86/Kconfig file and remove the depends on line.
Thanks,
Tom
+config AMD_MEM_ENCRYPT
+ bool "AMD Secure Memory Encryption (SME) support"
+ depends on X86_64 && CPU_SUP_AMD
+ ---help---
+ Say yes to enable support for the encryption of system memory.
+ This requires an AMD processor that supports Secure Memory
+ Encryption (SME).
Thanks,
tglx
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