## Copyright (C) 2019 - 2021 ENCRYPTED SUPPORT LP <adrelanos@whonix.org>
## See the file COPYING for copying conditions.

## Enables all mitigations for CPU vulnerabilities.
##
## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647

## Enable all mitigations for Spectre Variant 2.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/spectre.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spectre_v2=on"

## Disable Speculative Store Bypass.
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX spec_store_bypass_disable=on"

## Disable TSX, enable all mitigations for the TSX Async Abort
## vulnerability and disable SMT.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX tsx=off tsx_async_abort=full,nosmt"

## Enable all mitigations for the MDS vulnerability and disable
## SMT.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX mds=full,nosmt"

## Enable all mitigations for the L1TF vulnerability and disable SMT
## and L1D flush runtime control.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1tf=full,force"

## Force disable SMT as it has caused numerous CPU vulnerabilities.
##
## https://forums.whonix.org/t/should-all-kernel-patches-for-cpu-bugs-be-unconditionally-enabled-vs-performance-vs-applicability/7647/17
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX nosmt=force"

## Mark all huge pages in the EPT as non-executable to mitigate iTLB multihit.
##
## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/multihit.html#mitigation-control-on-the-kernel-command-line-and-kvm-module-parameter
GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kvm.nx_huge_pages=force"