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authorTom Lendacky <thomas.lendacky@amd.com>2017-07-18 00:10:05 +0300
committerIngo Molnar <mingo@kernel.org>2017-07-18 12:37:59 +0300
commit5868f3651fa0dff96a57f94d49247d3ef320ebe2 (patch)
tree11b9fdc343371d2d40d476ebddde2d0532c78ea9 /arch/x86/mm/mem_encrypt.c
parent33c2b803edd13487518a2c7d5002d84d7e9c878f (diff)
downloadlinux-5868f3651fa0dff96a57f94d49247d3ef320ebe2.tar.xz
x86/mm: Add support to enable SME in early boot processing
Add support to the early boot code to use Secure Memory Encryption (SME). Since the kernel has been loaded into memory in a decrypted state, encrypt the kernel in place and update the early pagetables with the memory encryption mask so that new pagetable entries will use memory encryption. The routines to set the encryption mask and perform the encryption are stub routines for now with functionality to be added in a later patch. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Dave Young <dyoung@redhat.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Larry Woodman <lwoodman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Toshimitsu Kani <toshi.kani@hpe.com> Cc: kasan-dev@googlegroups.com Cc: kvm@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-doc@vger.kernel.org Cc: linux-efi@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/e52ad781f085224bf835b3caff9aa3aee6febccb.1500319216.git.thomas.lendacky@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/mm/mem_encrypt.c')
-rw-r--r--arch/x86/mm/mem_encrypt.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index b99d469c73e7..3ac6f99b095c 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -11,6 +11,7 @@
*/
#include <linux/linkage.h>
+#include <linux/init.h>
/*
* Since SME related variables are set early in the boot process they must
@@ -19,3 +20,11 @@
*/
unsigned long sme_me_mask __section(.data) = 0;
EXPORT_SYMBOL_GPL(sme_me_mask);
+
+void __init sme_encrypt_kernel(void)
+{
+}
+
+void __init sme_enable(void)
+{
+}