From 3a4ee4ff819b2bd09f1eca4a90846f2be449bd51 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Mon, 29 Jul 2024 09:40:52 -0700 Subject: [PATCH] x86/bugs: Add a separate config for L1TF Currently, the CONFIG_SPECULATION_MITIGATIONS is halfway populated, where some mitigations have entries in Kconfig, and they could be modified, while others mitigations do not have Kconfig entries, and could not be controlled at build time. Create an entry for the L1TF CPU mitigation under CONFIG_SPECULATION_MITIGATIONS. This allow users to enable or disable it at compilation time. Signed-off-by: Breno Leitao Signed-off-by: Borislav Petkov (AMD) Acked-by: Josh Poimboeuf Link: https://lore.kernel.org/r/20240729164105.554296-5-leitao@debian.org --- arch/x86/Kconfig | 10 ++++++++++ arch/x86/kernel/cpu/bugs.c | 3 ++- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index b169677ec4ac..290f0865fd85 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2682,6 +2682,16 @@ config MITIGATION_MMIO_STALE_DATA attacker to have access to MMIO. See also + +config MITIGATION_L1TF + bool "Mitigate L1 Terminal Fault (L1TF) hardware bug" + depends on CPU_SUP_INTEL + default y + help + Mitigate L1 Terminal Fault (L1TF) hardware bug. L1 Terminal Fault is a + hardware vulnerability which allows unprivileged speculative access to data + available in the Level 1 Data Cache. + See