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x86/Kconfig: Update config and kernel doc for MPK feature on AMD

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AMD's next generation of EPYC processors support the MPK (Memory
Protection Keys) feature. Update the dependency and documentation.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/159068199556.26992.17733929401377275140.stgit@naples-babu.amd.com
This commit is contained in:
Babu Moger 2020-05-28 11:08:23 -05:00 committed by Borislav Petkov
parent d6ee652943
commit 38f3e775e9
2 changed files with 5 additions and 4 deletions
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5
Documentation/core-api/protection-keys.rst
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@ -5,8 +5,9 @@ Memory Protection Keys
======================
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.
which is found on Intel's Skylake (and later) "Scalable Processor"
Server CPUs. It will be available in future non-server Intel parts
and future AMD processors.
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

4
arch/x86/Kconfig
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@ -1887,10 +1887,10 @@ config X86_UMIP
results are dummy.
config X86_INTEL_MEMORY_PROTECTION_KEYS
prompt "Intel Memory Protection Keys"
prompt "Memory Protection Keys"
def_bool y
# Note: only available in 64-bit mode
depends on CPU_SUP_INTEL && X86_64
depends on X86_64 && (CPU_SUP_INTEL || CPU_SUP_AMD)
select ARCH_USES_HIGH_VMA_FLAGS
select ARCH_HAS_PKEYS
---help---