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Message-ID: <20170607191320.28645.51540.stgit@tlendack-t1.amdoffice.net>
Date: Wed, 07 Jun 2017 14:13:21 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: linux-arch@...r.kernel.org, linux-efi@...r.kernel.org,
kvm@...r.kernel.org, linux-doc@...r.kernel.org, x86@...nel.org,
kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
kasan-dev@...glegroups.com, linux-mm@...ck.org,
iommu@...ts.linux-foundation.org
Cc: Rik van Riel <riel@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Toshimitsu Kani <toshi.kani@....com>,
Arnd Bergmann <arnd@...db.de>,
Jonathan Corbet <corbet@....net>,
Matt Fleming <matt@...eblueprint.co.uk>,
"Michael S. Tsirkin" <mst@...hat.com>,
Joerg Roedel <joro@...tes.org>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Larry Woodman <lwoodman@...hat.com>,
Brijesh Singh <brijesh.singh@....com>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Andy Lutomirski <luto@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Alexander Potapenko <glider@...gle.com>,
Dave Young <dyoung@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Dmitry Vyukov <dvyukov@...gle.com>
Subject: [PATCH v6 01/34] x86: Document AMD Secure Memory Encryption (SME)
Create a Documentation entry to describe the AMD Secure Memory
Encryption (SME) feature and add documentation for the mem_encrypt=
kernel parameter.
Reviewed-by: Borislav Petkov <bp@...e.de>
Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
---
Documentation/admin-guide/kernel-parameters.txt | 11 ++++
Documentation/x86/amd-memory-encryption.txt | 68 +++++++++++++++++++++++
2 files changed, 79 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 4e4c340..abb65da 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2188,6 +2188,17 @@
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):
+ on (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=y)
+ off (CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT=n)
+ 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..f512ab7
--- /dev/null
+++ b/Documentation/x86/amd-memory-encryption.txt
@@ -0,0 +1,68 @@
+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 also be
+specified in the cr3 register, allowing the PGD table to be encrypted. Each
+successive level of page tables can also be encrypted by setting the encryption
+bit in the page table entry that points to the next table. This allows the full
+page table hierarchy to be encrypted. Note, this means that just because the
+encryption bit is set in cr3, doesn't imply the full hierarchy is encyrpted.
+Each page table entry in the hierarchy needs to have the encryption bit set to
+achieve that. So, theoretically, you could have the encryption bit set in cr3
+so that the PGD is encrypted, but not set the encryption bit in the PGD entry
+for a PUD which results in the PUD pointed to by that entry to not 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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