[PATCH v5 01/32] x86: Documentation for AMD Secure Memory Encryption (SME)

Tom Lendacky thomas.lendacky at amd.com
Tue Apr 18 14:16:25 PDT 2017

Create a Documentation entry to describe the AMD Secure Memory
Encryption (SME) feature and add documentation for the mem_encrypt=
kernel parameter.

Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
 Documentation/admin-guide/kernel-parameters.txt |   11 ++++
 Documentation/x86/amd-memory-encryption.txt     |   60 +++++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 Documentation/x86/amd-memory-encryption.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 3dd6d5d..84c5787 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2165,6 +2165,17 @@
 			memory contents and reserves bad memory
 			regions that are detected.
+	mem_encrypt=	[X86-64] AMD Secure Memory Encryption (SME) control
+			Valid arguments: on, off
+			Default (depends on kernel configuration option):
+			mem_encrypt=on:		Activate SME
+			mem_encrypt=off:	Do not activate SME
+			Refer to Documentation/x86/amd-memory-encryption.txt
+			for details on when memory encryption can be activated.
 	mem_sleep_default=	[SUSPEND] Default system suspend mode:
 			s2idle  - Suspend-To-Idle
 			shallow - Power-On Suspend or equivalent (if supported)
diff --git a/Documentation/x86/amd-memory-encryption.txt b/Documentation/x86/amd-memory-encryption.txt
new file mode 100644
index 0000000..0b72ff2
--- /dev/null
+++ b/Documentation/x86/amd-memory-encryption.txt
@@ -0,0 +1,60 @@
+Secure Memory Encryption (SME) is a feature found on AMD processors.
+SME provides the ability to mark individual pages of memory as encrypted using
+the standard x86 page tables.  A page that is marked encrypted will be
+automatically decrypted when read from DRAM and encrypted when written to
+DRAM.  SME can therefore be used to protect the contents of DRAM from physical
+attacks on the system.
+A page is encrypted when a page table entry has the encryption bit set (see
+below on how to determine its position).  The encryption bit can be specified
+in the cr3 register, allowing the PGD table to be encrypted. Each successive
+level of page tables can also be encrypted.
+Support for SME can be determined through the CPUID instruction. The CPUID
+function 0x8000001f reports information related to SME:
+	0x8000001f[eax]:
+		Bit[0] indicates support for SME
+	0x8000001f[ebx]:
+		Bits[5:0]  pagetable bit number used to activate memory
+			   encryption
+		Bits[11:6] reduction in physical address space, in bits, when
+			   memory encryption is enabled (this only affects
+			   system physical addresses, not guest physical
+			   addresses)
+If support for SME is present, MSR 0xc00100010 (MSR_K8_SYSCFG) can be used to
+determine if SME is enabled and/or to enable memory encryption:
+	0xc0010010:
+		Bit[23]   0 = memory encryption features are disabled
+			  1 = memory encryption features are enabled
+Linux relies on BIOS to set this bit if BIOS has determined that the reduction
+in the physical address space as a result of enabling memory encryption (see
+CPUID information above) will not conflict with the address space resource
+requirements for the system.  If this bit is not set upon Linux startup then
+Linux itself will not set it and memory encryption will not be possible.
+The state of SME in the Linux kernel can be documented as follows:
+	- Supported:
+	  The CPU supports SME (determined through CPUID instruction).
+	- Enabled:
+	  Supported and bit 23 of MSR_K8_SYSCFG is set.
+	- Active:
+	  Supported, Enabled and the Linux kernel is actively applying
+	  the encryption bit to page table entries (the SME mask in the
+	  kernel is non-zero).
+SME can also be enabled and activated in the BIOS. If SME is enabled and
+activated in the BIOS, then all memory accesses will be encrypted and it will
+not be necessary to activate the Linux memory encryption support.  If the BIOS
+merely enables SME (sets bit 23 of the MSR_K8_SYSCFG), then Linux can activate
+memory encryption by default (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y) or
+by supplying mem_encrypt=on on the kernel command line.  However, if BIOS does
+not enable SME, then Linux will not be able to activate memory encryption, even
+if configured to do so by default or the mem_encrypt=on command line parameter
+is specified.

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