From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from NAM01-SN1-obe.outbound.protection.outlook.com (mail-sn1nam01on0086.outbound.protection.outlook.com [104.47.32.86]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3xGW9x3J3DzDrJx for ; Tue, 25 Jul 2017 05:08:36 +1000 (AEST) From: Brijesh Singh To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-efi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org Cc: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Borislav Petkov , Andy Lutomirski , Tony Luck , Piotr Luc , Tom Lendacky , Fenghua Yu , Lu Baolu , Reza Arbab , David Howells , Matt Fleming , "Kirill A . Shutemov" , Laura Abbott , Ard Biesheuvel , Andrew Morton , Eric Biederman , Benjamin Herrenschmidt , Paul Mackerras , Konrad Rzeszutek Wilk , Jonathan Corbet , Dave Airlie , Kees Cook , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Arnd Bergmann , Tejun Heo , Christoph Lameter , Brijesh Singh Subject: [RFC Part1 PATCH v3 05/17] x86, realmode: Don't decrypt trampoline area under SEV Date: Mon, 24 Jul 2017 14:07:45 -0500 Message-Id: <20170724190757.11278-6-brijesh.singh@amd.com> In-Reply-To: <20170724190757.11278-1-brijesh.singh@amd.com> References: <20170724190757.11278-1-brijesh.singh@amd.com> MIME-Version: 1.0 Content-Type: text/plain List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Tom Lendacky 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 Signed-off-by: Brijesh Singh --- arch/x86/realmode/init.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index 1f71980..c7eeca7 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -63,9 +63,11 @@ 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. For SEV the trampoline area needs to be in + * encrypted memory, so only do this for SME. */ - set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT); + if (sme_active()) + set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT); memcpy(base, real_mode_blob, size); -- 2.9.4