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Subject[tip:x86/urgent] x86/pkeys: Update documentation about availability
Commit-ID:  c51ff2c7fc45da8b18b28c4f15eca5a9975dfb59
Author: Dave Hansen <>
AuthorDate: Fri, 10 Nov 2017 16:12:28 -0800
Committer: Ingo Molnar <>
CommitDate: Tue, 21 Nov 2017 09:34:52 +0100

x86/pkeys: Update documentation about availability

Now that CPUs that implement Memory Protection Keys are publicly
available we can be a bit less oblique about where it is available.

Signed-off-by: Dave Hansen <>
Acked-by: Thomas Gleixner <>
Cc: Andy Lutomirski <>
Cc: Borislav Petkov <>
Cc: Brian Gerst <>
Cc: Denys Vlasenko <>
Cc: H. Peter Anvin <>
Cc: Josh Poimboeuf <>
Cc: Linus Torvalds <>
Cc: Peter Zijlstra <>
Signed-off-by: Ingo Molnar <>
Documentation/x86/protection-keys.txt | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/x86/protection-keys.txt b/Documentation/x86/protection-keys.txt
index fa46dcb..ecb0d2d 100644
--- a/Documentation/x86/protection-keys.txt
+++ b/Documentation/x86/protection-keys.txt
@@ -1,5 +1,10 @@
-Memory Protection Keys for Userspace (PKU aka PKEYs) is a CPU feature
-which will be found on future Intel CPUs.
+Memory Protection Keys for Userspace (PKU aka PKEYs) is a feature
+which is found on Intel's Skylake "Scalable Processor" Server CPUs.
+It will be avalable in future non-server parts.
+For anyone wishing to test or use this feature, it is available in
+Amazon's EC2 C5 instances and is known to work there using an Ubuntu
+17.04 image.

Memory Protection Keys provides a mechanism for enforcing page-based
protections, but without requiring modification of the page tables
 \ /
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