From 59e90ff1226bd6330d85244cf7c73ecf7fd5fdf1 Mon Sep 17 00:00:00 2001
From: Raja Grewal <rg_public@proton.me>
Date: Tue, 19 Jul 2022 02:32:41 +1000
Subject: [PATCH] CPU mitigation - L1D FLushing

---
 etc/default/grub.d/40_cpu_mitigations.cfg | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/etc/default/grub.d/40_cpu_mitigations.cfg b/etc/default/grub.d/40_cpu_mitigations.cfg
index fa9bd80..9caafb8 100644
--- a/etc/default/grub.d/40_cpu_mitigations.cfg
+++ b/etc/default/grub.d/40_cpu_mitigations.cfg
@@ -46,3 +46,8 @@ GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX kvm.nx_huge_pages=force"
 ##
 ## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/special-register-buffer-data-sampling.html
 GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX srbds=on"
+
+## Enables the prctl interface to prevent leaks from L1D on context switches.
+##
+## https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1d_flush.html
+GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX l1d_flush=on"