Commit 163ea3c8 authored Jul 17, 2017 by Tom Lendacky Committed by Ingo Molnar Jul 18, 2017

x86/realmode: Decrypt trampoline area if memory encryption is active



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@amd.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.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/c70ffd2614fa77e80df31c9169ca98a9b16ff97c.1500319216.git.thomas.lendacky@amd.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 77bd2342

arch/x86/realmode/init.c

+8 −0

Original line number	Diff line number	Diff line
		#include <linux/io.h>
		#include <linux/slab.h>
		#include <linux/memblock.h>
		#include <linux/mem_encrypt.h>

		#include <asm/set_memory.h>
		#include <asm/pgtable.h>
		@@ -59,6 +60,13 @@ static void __init setup_real_mode(void)

		base = (unsigned char *)real_mode_header;

		/*
		* If SME is active, the trampoline area will need to be in
		* decrypted memory in order to bring up other processors
		* successfully.
		*/
		set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT);

		memcpy(base, real_mode_blob, size);

		phys_base = __pa(base);

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