From patchwork Fri Jun 16 18:53:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tom Lendacky X-Patchwork-Id: 9793365 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 A217260325 for ; Fri, 16 Jun 2017 18:59:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 947FF2866B for ; Fri, 16 Jun 2017 18:59:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 88E4128671; Fri, 16 Jun 2017 18:59:19 +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 03C6F2866B for ; Fri, 16 Jun 2017 18:59:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752797AbdFPSyJ (ORCPT ); Fri, 16 Jun 2017 14:54:09 -0400 Received: from mail-dm3nam03on0077.outbound.protection.outlook.com ([104.47.41.77]:49440 "EHLO NAM03-DM3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752506AbdFPSyB (ORCPT ); Fri, 16 Jun 2017 14:54:01 -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=hxK7INceThijkSydmMCXxIVcmjnwi1u2LAtsWD/kJjM=; b=DaEfCRUosSTy2XEQCFBoEYGR3N2nrj1iaTyYdQWjExmr+agPNKU4SGpCLh8+O0J9zyjCAYHtAxMKA2S8L3mbl65g9nfIXFNGlDqUqzOAsLQBB/2iAQT9sCRsSC8K4Qv+eohe2yndwjfAWr4MD6LfzmT+Re6sVZqGm6APpv1p3S4= 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 MWHPR12MB1152.namprd12.prod.outlook.com (10.169.204.16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1178.14; Fri, 16 Jun 2017 18:53:52 +0000 From: Tom Lendacky Subject: [PATCH v7 21/36] x86/mm: Add support to access persistent memory in the clear 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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MWHPR12MB1152; 20:vb4aAjUZWjsmpZ+lgP4EbUwc0NexRLHu20racczZMFEfAqpDwrATKsGcPfmIs4RqhGwQ2oZRYt3gFpw/2ZfWsWm+Hg3/cmQw9pcClNgafNkfoVOgdN0gGOPE0khBRNKkypiYaFBj4UPUxtVN/qe8/CZmRT9WVbwKuYHEFu30garn374POLabgiaudmGdXYDcdETVfjyJPjYm/lfG8Zq4UXLf5nqQI/ty35PIiBme3hqyVlnqPG2ExlktJyNZUaDW X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Jun 2017 18:53:52.6983 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR12MB1152 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Persistent memory is expected to persist across reboots. The encryption key used by SME will change across reboots which will result in corrupted persistent memory. Persistent memory is handed out by block devices through memory remapping functions, so be sure not to map this memory as encrypted. Reviewed-by: Borislav Petkov Signed-off-by: Tom Lendacky --- arch/x86/mm/ioremap.c | 31 ++++++++++++++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index f3fa007..0254b78 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -428,17 +428,46 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr) * Examine the physical address to determine if it is an area of memory * that should be mapped decrypted. If the memory is not part of the * kernel usable area it was accessed and created decrypted, so these - * areas should be mapped decrypted. + * areas should be mapped decrypted. And since the encryption key can + * change across reboots, persistent memory should also be mapped + * decrypted. */ static bool memremap_should_map_decrypted(resource_size_t phys_addr, unsigned long size) { + int is_pmem; + + /* + * Check if the address is part of a persistent memory region. + * This check covers areas added by E820, EFI and ACPI. + */ + is_pmem = region_intersects(phys_addr, size, IORESOURCE_MEM, + IORES_DESC_PERSISTENT_MEMORY); + if (is_pmem != REGION_DISJOINT) + return true; + + /* + * Check if the non-volatile attribute is set for an EFI + * reserved area. + */ + if (efi_enabled(EFI_BOOT)) { + switch (efi_mem_type(phys_addr)) { + case EFI_RESERVED_TYPE: + if (efi_mem_attributes(phys_addr) & EFI_MEMORY_NV) + return true; + break; + default: + break; + } + } + /* Check if the address is outside kernel usable area */ switch (e820__get_entry_type(phys_addr, phys_addr + size - 1)) { case E820_TYPE_RESERVED: case E820_TYPE_ACPI: case E820_TYPE_NVS: case E820_TYPE_UNUSABLE: + case E820_TYPE_PRAM: return true; default: break;