From patchwork Fri Jul 7 13:42:24 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tom Lendacky X-Patchwork-Id: 9830469 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 257C960352 for ; Fri, 7 Jul 2017 13:48:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BB6B32853B for ; Fri, 7 Jul 2017 13:48:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B023128671; Fri, 7 Jul 2017 13:48:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 10F822853B for ; Fri, 7 Jul 2017 13:48:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753077AbdGGNmm (ORCPT ); Fri, 7 Jul 2017 09:42:42 -0400 Received: from mail-by2nam03on0088.outbound.protection.outlook.com ([104.47.42.88]:1600 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752760AbdGGNmg (ORCPT ); Fri, 7 Jul 2017 09:42:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amdcloud.onmicrosoft.com; s=selector1-amd-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=/t/ZdmDwNmfyBznJOJQOJe5GwOJTePCmypuN8IIwFHc=; b=jEdfbfWBWt3tRwohUjdNtgloHOyIy3qmZNA0c1dQ6f5G6r2FnxtkOvjVxhFv9GMErL6DY2I9xGitRbvRQ3yvO7LEK0QuiWzJTv3QQ5p6pQ/3Cgl8rW4dxw2zc+XeYXWd8MZnaqtz04oCBzgcjVfKgNX+WBXOhjFZH1aaFgNwhOw= Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none; vger.kernel.org; dmarc=none action=none header.from=amd.com; Received: from tlendack-t1.amdoffice.net (165.204.77.1) by CY4PR12MB1141.namprd12.prod.outlook.com (10.168.163.149) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1220.11; Fri, 7 Jul 2017 13:42:28 +0000 From: Tom Lendacky Subject: [PATCH v9 23/38] x86/realmode: Decrypt trampoline area if memory encryption is active 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. 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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);