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1;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: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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; From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Lendacky Subject: [PATCH v7 21/36] x86/mm: Add support to access persistent memory in the clear Date: Fri, 16 Jun 2017 13:53:49 -0500 Message-ID: <20170616185349.18967.38054.stgit@tlendack-t1.amdoffice.net> References: <20170616184947.18967.84890.stgit@tlendack-t1.amdoffice.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170616184947.18967.84890.stgit@tlendack-t1.amdoffice.net> Sender: owner-linux-mm@kvack.org 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 List-Id: linux-efi@vger.kernel.org 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; -- 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-dm3nam03on0079.outbound.protection.outlook.com ([104.47.41.79] helo=NAM03-DM3-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1dLwNw-0002Hl-A9 for kexec@lists.infradead.org; Fri, 16 Jun 2017 18:54:22 +0000 From: Tom Lendacky Subject: [PATCH v7 21/36] x86/mm: Add support to access persistent memory in the clear Date: Fri, 16 Jun 2017 13:53:49 -0500 Message-ID: <20170616185349.18967.38054.stgit@tlendack-t1.amdoffice.net> In-Reply-To: <20170616184947.18967.84890.stgit@tlendack-t1.amdoffice.net> References: <20170616184947.18967.84890.stgit@tlendack-t1.amdoffice.net> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org 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 , "Michael S. Tsirkin" , Matt Fleming , Alexander Potapenko , "H. Peter Anvin" , Boris Ostrovsky , Jonathan Corbet , Joerg Roedel , Radim =?utf-8?b?S3LEjW3DocWZ?= , Larry Woodman , Ingo Molnar , Andrey Ryabinin , Dave Young , Rik van Riel , Arnd Bergmann , Konrad Rzeszutek Wilk , Borislav Petkov , Andy Lutomirski , Thomas Gleixner , Dmitry Vyukov , Juergen Gross , Paolo Bonzini 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; _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec