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x86: disable usermode on 64-bit unless no meltdown

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KPTI is still work-in-progress on x86_64. Don't allow
user mode to be enabled unless the SOC/board configuration
indicates that the CPU in use is invulnerable to meltdown
attacks.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2020-01-05 17:19:43 -08:00 • committed by Anas Nashif
commit 808cca0efb
2 changed files with 4 additions and 3 deletions
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boards/x86/qemu_x86/Kconfig.board
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@ -11,4 +11,5 @@ config BOARD_QEMU_X86_64
bool "QEMU x86_64"
depends on SOC_IA32
select QEMU_TARGET
select X86_NO_MELTDOWN # Until KPTI is enabled, allow testing
select X86_64