[tip:x86/mm] x86/mm: Add support to access persistent memory in the clear

[tip-bot for Tom Lendacky]

Commit-ID:  1de328628cd06b5efff9195b57bdc1a64680814d
Gitweb:     http://git.kernel.org/tip/1de328628cd06b5efff9195b57bdc1a64680814d
Author:     Tom Lendacky <thomas.lendacky@xxxxxxx>
AuthorDate: Mon, 17 Jul 2017 16:10:18 -0500
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 18 Jul 2017 11:38:02 +0200

x86/mm: Add support to access persistent memory in the clear

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.

Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Borislav Petkov <bp@xxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brijesh Singh <brijesh.singh@xxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Larry Woodman <lwoodman@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Toshimitsu Kani <toshi.kani@xxxxxxx>
Cc: kasan-dev@xxxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: linux-efi@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Link: http://lkml.kernel.org/r/7d829302d8fdc85f3d9505fc3eb8ec0c3a3e1cbf.1500319216.git.thomas.lendacky@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 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 8986b28..704fc08 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -424,17 +424,46 @@ 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;