path: root/Documentation/x86
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authorChangbin Du <changbin.du@gmail.com>2019-05-08 15:21:28 (GMT)
committerJonathan Corbet <corbet@lwn.net>2019-05-08 20:34:10 (GMT)
commit0c7180f2e4e6fc02f268e18c4f753d9f9cdfb5ad (patch)
tree795b6bba3c7a6f2145b5fbf2efb806367f50132d /Documentation/x86
parentf10b07a01a48d0584fa9815005e04c54058e2e47 (diff)
Documentation: x86: convert amd-memory-encryption.txt to reST
This converts the plain text documentation to reStructuredText format and add it to Sphinx TOC tree. No essential content change. Signed-off-by: Changbin Du <changbin.du@gmail.com> Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/x86')
-rw-r--r--Documentation/x86/amd-memory-encryption.rst (renamed from Documentation/x86/amd-memory-encryption.txt)13
2 files changed, 11 insertions, 3 deletions
diff --git a/Documentation/x86/amd-memory-encryption.txt b/Documentation/x86/amd-memory-encryption.rst
index afc41f5..c48d452 100644
--- a/Documentation/x86/amd-memory-encryption.txt
+++ b/Documentation/x86/amd-memory-encryption.rst
@@ -1,3 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0
+AMD Memory Encryption
Secure Memory Encryption (SME) and Secure Encrypted Virtualization (SEV) are
features found on AMD processors.
@@ -34,7 +40,7 @@ is operating in 64-bit or 32-bit PAE mode, in all other modes the SEV hardware
forces the memory encryption bit to 1.
Support for SME and SEV can be determined through the CPUID instruction. The
-CPUID function 0x8000001f reports information related to SME:
+CPUID function 0x8000001f reports information related to SME::
Bit[0] indicates support for SME
@@ -48,14 +54,14 @@ CPUID function 0x8000001f reports information related to SME:
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:
+determine if SME is enabled and/or to enable memory encryption::
Bit[23] 0 = memory encryption features are disabled
1 = memory encryption features are enabled
If SEV is supported, MSR 0xc0010131 (MSR_AMD64_SEV) can be used to determine if
-SEV is active:
+SEV is active::
Bit[0] 0 = memory encryption is not active
@@ -68,6 +74,7 @@ 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).
diff --git a/Documentation/x86/index.rst b/Documentation/x86/index.rst
index b5cdc0d..85f1f44 100644
--- a/Documentation/x86/index.rst
+++ b/Documentation/x86/index.rst
@@ -20,3 +20,4 @@ x86-specific Documentation
+ amd-memory-encryption