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Documentation: x86: convert amd-memory-encryption.txt to reST

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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>
This commit is contained in:
Changbin Du 2019-05-08 23:21:28 +08:00 committed by Jonathan Corbet
parent f10b07a01a
commit 0c7180f2e4
2 changed files with 11 additions and 3 deletions
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13
Documentation/x86/amd-memory-encryption.txt → Documentation/x86/amd-memory-encryption.rst
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@ -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::
0x8000001f[eax]:
Bit[0] indicates support for SME
@ -48,14 +54,14 @@ CPUID function 0x8000001f reports information related to SME:
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:
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
If SEV is supported, MSR 0xc0010131 (MSR_AMD64_SEV) can be used to determine if
SEV is active:
SEV is active::
0xc0010131:
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).

1
Documentation/x86/index.rst
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@ -20,3 +20,4 @@ x86-specific Documentation
pat
protection-keys
intel_mpx
amd-memory-encryption