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x86: add Kconfig for KPTI

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This will be enabled by default for any x86 that isn't
noted as being immune to this CPU bug.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-02-06 15:27:52 -08:00 • committed by Anas Nashif
commit 89a127bc8e
1 changed files with 11 additions and 0 deletions
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11
arch/x86/Kconfig
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@ -123,6 +123,17 @@ config X86_USERSPACE
supporting user-level threads that are protected from each other and
from crashing the kernel.
config X86_KPTI
bool "Enable kernel page table isolation"
default y
depends on USERSPACE
depends on !X86_NO_MELTDOWN
help
Implements kernel page table isolation to mitigate Meltdown exploits
to read Kernel RAM. Incurs a significant performance cost for
user thread interrupts and system calls, and significant footprint
increase for additional page tables and trampoline stacks.
menu "Architecture Floating Point Options"
depends on CPU_HAS_FPU