Commit fcdcd6cd authored Oct 20, 2017 by Tom Lendacky Committed by Thomas Gleixner Nov 07, 2017

x86/realmode: Don't decrypt trampoline area under SEV



When SEV is active the trampoline area will need to be in encrypted
memory so only mark the area decrypted if SME is active.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: Laura Abbott <labbott@redhat.com>
Cc: kvm@vger.kernel.org
Cc: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Link: https://lkml.kernel.org/r/20171020143059.3291-5-brijesh.singh@amd.com

parent 682af543

arch/x86/realmode/init.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -64,8 +64,9 @@ static void __init setup_real_mode(void)
		/*
		* If SME is active, the trampoline area will need to be in
		* decrypted memory in order to bring up other processors
		* successfully.
		* successfully. This is not needed for SEV.
		*/
		if (sme_active())
		set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT);

		memcpy(base, real_mode_blob, size);