From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id 35A646B03B1 for ; Fri, 7 Jul 2017 09:42:36 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id z10so33232221pff.1 for ; Fri, 07 Jul 2017 06:42:36 -0700 (PDT) Received: from NAM03-BY2-obe.outbound.protection.outlook.com (mail-by2nam03on0086.outbound.protection.outlook.com. [104.47.42.86]) by mx.google.com with ESMTPS id z77si2251786pfa.80.2017.07.07.06.42.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 07 Jul 2017 06:42:35 -0700 (PDT) From: Tom Lendacky Subject: [PATCH v9 23/38] x86/realmode: Decrypt trampoline area if memory encryption is active Date: Fri, 07 Jul 2017 08:42:24 -0500 Message-ID: <20170707134224.29711.90107.stgit@tlendack-t1.amdoffice.net> In-Reply-To: <20170707133804.29711.1616.stgit@tlendack-t1.amdoffice.net> References: <20170707133804.29711.1616.stgit@tlendack-t1.amdoffice.net> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-arch@vger.kernel.org, linux-efi@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, xen-devel@lists.xen.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Brijesh Singh , Toshimitsu Kani , Radim =?utf-8?b?S3LEjW3DocWZ?= , Matt Fleming , Alexander Potapenko , "H. Peter Anvin" , Larry Woodman , Jonathan Corbet , Joerg Roedel , "Michael S. Tsirkin" , Ingo Molnar , Andrey Ryabinin , Dave Young , Rik van Riel , Arnd Bergmann , Konrad Rzeszutek Wilk , Borislav Petkov , Andy Lutomirski , Boris Ostrovsky , Dmitry Vyukov , Juergen Gross , Thomas Gleixner , Paolo Bonzini 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. Reviewed-by: Borislav Petkov Signed-off-by: Tom Lendacky --- arch/x86/realmode/init.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index cd4be19..d6ddc7e 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -1,6 +1,7 @@ #include #include #include +#include #include #include @@ -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); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org