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Message-Id: <20171109191249.B63E9BDB@viggo.jf.intel.com> Date: Thu, 09 Nov 2017 11:12:49 -0800 From: Dave Hansen <dave.hansen@...ux.intel.com> To: linux-kernel@...r.kernel.org Cc: x86@...nel.org, dave.hansen@...ux.intel.com Subject: [PATCH] x86, pkeys: update documentation about availability From: Dave Hansen <dave.hansen@...ux.intel.com> 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 <dave.hansen@...ux.intel.com> --- b/Documentation/x86/protection-keys.txt | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff -puN Documentation/x86/protection-keys.txt~pkeys-update Documentation/x86/protection-keys.txt --- a/Documentation/x86/protection-keys.txt~pkeys-update 2017-11-09 10:36:53.381467202 -0800 +++ b/Documentation/x86/protection-keys.txt 2017-11-09 10:43:15.527466249 -0800 @@ -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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